阅读说明：本技术 一种新型光催化复合材料的应用 (Application of novel photocatalytic composite material ) 是由 李展鹏 王海林 汪霜 于 2021-07-01 设计创作，主要内容包括：本发明公开了一种新型光催化复合材料的应用,本发明的光催化复合材料因具有球型结构,能够提升光生电子空穴对的分离能力,大大提高材料对可见光的利用率,在可见光下具有很好的催化性能。本发明利用引光柱将滤板表面照射的光线通过折射引入两层滤板之间,有效解决了工业废水处理时光线与锐钛型二氧化钛颗粒料接触不良的问题,可以缓解滤板和工业污水对于光催化材料的遮挡导致的催化不良问题,最大限度的发挥了氟碳共掺杂的锐钛型二氧化钛复合材料的催化性能。(The invention discloses application of a novel photocatalytic composite material, and the photocatalytic composite material has a spherical structure, can improve the separating capacity of photoproduction electron hole pairs, greatly improves the utilization rate of the material on visible light, and has good catalytic performance under the visible light. According to the invention, light irradiated on the surface of the filter plate is introduced between the two filter plates by the light guide column through refraction, so that the problem of poor contact between the light and the anatase titanium dioxide particles during industrial wastewater treatment is effectively solved, the problem of poor catalysis caused by shielding of the filter plate and industrial wastewater on a photocatalytic material can be relieved, and the catalytic performance of the fluorocarbon co-doped anatase titanium dioxide composite material is exerted to the maximum extent.)

1. The application of the novel photocatalytic composite material is characterized in that biomass-based spherical anatase titanium dioxide granules are filled into a circulating photocatalytic device to carry out photocatalytic degradation on industrial wastewater, and the method comprises the following specific steps:

(1) filling and fixing biomass-based spherical anatase titanium dioxide particles into a plate-shaped processing unit, and inserting the plate-shaped processing unit into a circulating processing groove;

(2) industrial wastewater to be treated is circularly injected into the upper surface of the plate-shaped treatment unit, the industrial wastewater enters the circulating tank after being filtered by the plate-shaped treatment unit from top to bottom, and the industrial wastewater in the circulating tank is repeatedly injected above the plate-shaped treatment unit through the circulating system to finish repeated catalytic treatment;

(3) the method is characterized in that a light source is arranged above a plate-shaped treatment unit while industrial wastewater is circularly treated, a plurality of light guiding columns extend out of the top of the plate-shaped treatment unit, and the light guiding columns are level with or extend out of the liquid level of the industrial wastewater to be treated.

2. Use of a novel photocatalytic composite material according to claim 1, characterized in that: the biomass-based spherical anatase titanium dioxide particles are obtained by loading spherical anatase titanium dioxide on the surface of biomass; the biomass comprises biomass and spherical anatase titanium dioxide, wherein the mass content of the biomass is 70-98%, the mass content of the spherical anatase titanium dioxide is 2-30%, and fluorine elements and carbon elements are doped in the spherical anatase titanium dioxide.

3. Use of a novel photocatalytic composite material as set forth in claim 1 or 2, characterized in that: the circulating photocatalysis device comprises a tank body (1), wherein a plate-shaped processing unit is slidably connected to the upper part of the tank body (1), a light source (3) is arranged at the top of the tank body (1), the light source (3) is arranged above the plate-shaped processing unit, when industrial wastewater is filtered through the plate-shaped processing unit from top to bottom, the plate-shaped processing unit introduces light into the tank body to irradiate biomass-based spherical anatase titanium dioxide particles and degrade the industrial wastewater through photocatalysis, a circulating groove (11) is arranged at the bottom of the tank body (1), a water outlet (12) is formed in the bottom of the circulating groove (11), a circulating pipe (4) is arranged on the water outlet (12), the upper end of the circulating pipe (4) is opened at the top of the tank body (1), and a circulating pump (41) is arranged in the middle of the circulating pipe (4).

4. Use of a novel photocatalytic composite material as set forth in claim 3, characterized in that: the plate-shaped processing unit comprises a frame (2), wherein sliding strips (22) are arranged on two sides of the frame (2), the frame (2) is connected with the upper part of the tank body (1) in a sliding manner through the sliding strips (22), the bottom of the frame (2) is connected with a lower filter plate (21) in a sliding manner, the top surface of the frame (2) is detachably connected with an upper filter plate (28), a plurality of transverse partition plates (23) and longitudinal partition plates (27) are arranged in the frame (2), the transverse partition plates (23) and the longitudinal partition plates (27) divide the inside of the frame (2) into a plurality of squares, biomass-based spherical anatase-shaped titanium dioxide granules are filled in the squares, a light guide column (24) is arranged at the intersection of the transverse partition plates (23) and the longitudinal partition plates (27), the upper part of the light guide column (24) penetrates out of the upper filter plate (28) and is hermetically spliced with the upper filter plate (28), and the light source (3) is arranged above the light guide column (24) and the upper filter plate (28), the filter plate is characterized in that water baffles (26) are further arranged on the four walls of the frame (2), water inlet holes (25) are formed in the water baffles (26), the water inlet holes (25) are formed above the upper filter plate (28), the upper port of the circulating pipe (4) penetrates out of the water inlet holes (25), and the circulating groove (11) is formed below the lower filter plate (21).

Technical Field

The invention relates to the field of photocatalytic materials, in particular to application of a novel photocatalytic composite material.

Background

Semiconductor materials generally used as photocatalysts are mostly metal oxides, metal sulfides and metal nitrides, and catalytic reactions are required to be carried out with sufficient forbidden band widths. The photocatalytic material must satisfy the requirement that the material itself has a certain reducing power in the energy band region H2O/OH (E0 ═ 2.8v), and that the material itself has a certain stability. Titanium dioxide (Eg 3.2eV) has the advantages of high photocatalytic activity, chemical and biological inertness, chemical and photo corrosion resistance, low cost, abundant raw material sources and the like, so that titanium dioxide is one of the most widely, most promising and most interesting semiconductor materials in photocatalytic materials. Because the forbidden band width of titanium dioxide is about 3.2eV, the titanium dioxide can only carry out photocatalytic reaction in an ultraviolet region in sunlight, and the ultraviolet part in the solar spectrum only accounts for about 4%, so that the use of the titanium dioxide catalytic material is limited to a great extent. The doping of nitrogen can make the absorption red shift of titanium dioxide, and the titanium dioxide has certain catalytic performance under visible light, but the synthesis process is relatively complex.

The titanium dioxide photocatalyst has wide application prospect in the fields of treating environmental pollution and the like, but because the titanium dioxide photocatalyst has high catalytic activity only under the excitation of ultraviolet light, and the energy share of the ultraviolet light in sunlight is less than 5%, in order to fully utilize the sunlight, a great deal of research is devoted to expanding the photoresponse area of the titanium dioxide so as to develop the photocatalytic performance of the titanium dioxide photocatalyst under the irradiation of visible light. Research shows that fluorine element doping in anatase type titanium dioxide photocatalyst crystal can make absorption wavelength of titanium dioxide photocatalyst generate red shift, so that the titanium dioxide photocatalyst has certain absorption in visible light region. The doped carbon element can also cause the absorption wavelength of the titanium dioxide photocatalyst to generate red shift.

In the prior art, the free carbon is physically doped in a high-temperature or calcining way when the carbon-doped anatase titanium dioxide is prepared, because the amorphous titanium dioxide needs to be converted into the anatase titanium dioxide at a high temperature or calcined, and the carbon element needs to be doped at a high temperature or calcined, usually above 900 ℃, and the specific structure and characteristics of the carbon element can be damaged in the high-temperature or calcining process. The carbon-doped anatase titanium dioxide prepared by the calcination process does not involve chemical doping of the carbon-containing groups.

In the prior art, the anatase titanium dioxide can also be prepared on the surface of a solid phase carrier by deposition through a wet and hot method, the wet and hot method needs to be carried out in a high-pressure reaction kettle at the temperature of 80-200 ℃, the conditions are harsh, the solid phase carrier cannot be carbonized at a lower temperature, free carbon does not exist, and carbon doping cannot be carried out while the anatase titanium dioxide is formed by deposition.

In addition, when some existing granular photocatalytic materials are used for treating substrates such as industrial wastewater, the granular photocatalytic materials need to be fixed in a certain space, and a common method comprises the steps of bonding fine granules into a spherical shape, then filling the spherical granular material into a water-permeable bag, immersing the spherical granular material into the wastewater, or extruding and clamping the spherical granular material in a filter plate to enable the industrial wastewater to pass through the granular photocatalytic materials to complete wastewater treatment, so that the smaller granules can be prevented from escaping with water, but not only can the contact area between the granules and the wastewater be reduced, and the treatment efficiency be reduced, but more importantly, due to the shielding of the industrial wastewater and the filter plate, the common industrial wastewater treatment operation can cause light to be difficult to enter the photocatalytic materials, the granular photocatalytic materials can not be in full contact with visible light, and even when the wastewater concentration is high, the illumination intensity on the surface of the photocatalytic materials is difficult to ensure, the photocatalytic material can not contact enough light, the catalytic efficiency is greatly reduced, and the application of the photocatalytic material in wastewater treatment is seriously influenced.

Disclosure of Invention

The technical problems to be solved by the invention are as follows: the problem of poor internal light transmission of the existing photocatalytic material in the application process is solved.

In order to solve the technical problems, the invention provides the following technical scheme:

the utility model provides an application of novel photocatalysis combined material, loads into circulation photocatalysis device with living beings base globular anatase titanium dioxide granule material and carries out the photocatalytic degradation to industrial waste water, and concrete step is as follows:

(1) filling and fixing biomass-based spherical anatase titanium dioxide particles into a plate-shaped processing unit, and inserting the plate-shaped processing unit into a circulating processing groove;

(2) industrial wastewater to be treated is circularly injected into the upper surface of the plate-shaped treatment unit, the industrial wastewater enters the circulating tank after being filtered by the plate-shaped treatment unit from top to bottom, and the industrial wastewater in the circulating tank is repeatedly injected above the plate-shaped treatment unit through the circulating system to finish repeated catalytic treatment;

(3) the method is characterized in that a light source is arranged above a plate-shaped treatment unit while industrial wastewater is circularly treated, a plurality of light guiding columns extend out of the top of the plate-shaped treatment unit, and the light guiding columns are level with or extend out of the liquid level of the industrial wastewater to be treated.

Preferably, the biomass-based spherical anatase titanium dioxide particles are obtained by loading spherical anatase titanium dioxide on the surface of biomass; the biomass comprises biomass and spherical anatase titanium dioxide, wherein the mass content of the biomass is 70-98%, the mass content of the spherical anatase titanium dioxide is 2-30%, and fluorine elements and carbon elements are doped in the spherical anatase titanium dioxide.

Preferably, the circulating photocatalytic device comprises a tank body, the upper part of the tank body is connected with a plate-shaped treatment unit in a sliding mode, the top of the tank body is provided with a light source, the light source is arranged above the plate-shaped treatment unit, when industrial wastewater passes through the plate-shaped treatment unit from top to bottom, the plate-shaped treatment unit introduces light into the tank body to irradiate biomass-based spherical anatase titanium dioxide particles and degrade the industrial wastewater through photocatalysis, the bottom of the tank body is provided with a circulating groove, the bottom of the circulating groove is provided with a water outlet, the water outlet is provided with a circulating pipe, the upper end of the circulating pipe is opened at the top of the tank body, and the middle part of the circulating pipe is provided with a circulating pump.

Preferably, the plate-shaped processing unit comprises a frame, sliding strips are arranged on two sides of the frame, the frame is in sliding connection with the upper part of the tank body through the sliding strips, a lower filter plate is in sliding connection with the bottom of the frame, an upper filter plate is detachably connected with the top surface of the frame, a plurality of transverse partition plates and longitudinal partition plates are arranged in the frame, the transverse partition plates and the longitudinal partition plates divide the frame into a plurality of squares, biomass-based spherical anatase titanium dioxide particles are filled in the squares, a light guide column is arranged at the intersection of the transverse partition plates and the longitudinal partition plates, the upper part of the light guide column penetrates out of the upper filter plate and is in sealed insertion connection with the upper filter plate, the light source is arranged above the light guide column and the upper filter plate, water baffles are further arranged on four walls of the frame, water inlet holes are formed in the water baffles, the water inlet holes are formed in the upper part of the upper filter plate, and the upper port of the circulating pipe penetrates out of the water inlet holes, the circulating groove is arranged below the lower filter plate.

The invention has the following beneficial effects:

the method takes urea as a precipitator and sodium fluotitanate or ammonium fluotitanate as a titanium source by a homogeneous precipitation method under normal pressure, and takes the surfaces and edges of materials such as rice hulls, rice straws, wheat husks and wheat straws and the like with a large amount of oxygen-containing functional groups (such as hydroxyl, carboxyl and the like) as nucleation centers to self-assemble at low temperature (100 ℃) to generate the fluorocarbon co-doped anatase titanium dioxide composite material. The main raw materials of the invention are derived from crop wastes, thus saving energy and protecting environment. The photocatalytic composite material has a spherical structure, so that the separating capability of photoproduction electron hole pairs can be improved, the utilization rate of the material on visible light is greatly improved, and the photocatalytic composite material has good catalytic performance under the visible light.

According to the invention, the light irradiated on the surface of the filter plate is introduced between the two filter plates by the light guide column through refraction, so that the problem of poor contact between the light and the anatase titanium dioxide particles during industrial wastewater treatment is effectively solved, the problem of poor catalysis caused by shielding of the filter plate and industrial wastewater on a photocatalytic material can be relieved, and the catalytic performance of the fluorocarbon co-doped anatase titanium dioxide composite material is exerted to the maximum extent.

Drawings

FIG. 1 is a scanning electron microscope image of the field emission of the photocatalytic composite material prepared in example 1;

FIG. 2 is an XRD pattern of the photocatalytic composite material prepared in example 1;

FIG. 3 is a UV-visible chart of the photocatalytic composite material prepared in example 1;

fig. 4 is a graph showing the effect of photocatalytic methyl orange under visible light excitation of the photocatalytic composite material prepared in example 1.

FIG. 5 is a schematic view of the overall structure of the circulating photocatalytic device;

FIG. 6 is a top view of a recirculating photocatalytic device;

FIG. 7 is a sectional view taken along line B-B of FIG. 6;

FIG. 8 is a cross-sectional view taken along line C-C of FIG. 6;

fig. 9 is a schematic view of the internal structure of the plate-shaped processing unit.

The device comprises a tank body 1, a circulation tank 11, a water outlet 12, a frame 2, a lower filter plate 21, a slide bar 22, a transverse partition plate 23, a light guide column 24, a water inlet 25, a water baffle 26, a longitudinal partition plate 27, an upper filter plate 28, a light source 3, a circulation pipe 4 and a circulation pump 41.

Detailed Description

The following examples are included to provide further detailed description of the present invention and to provide those skilled in the art with a more complete, concise, and exact understanding of the principles and spirit of the invention.

Example 1: the novel photocatalytic composite material is prepared as follows:

(1) cleaning and drying the rice hulls to obtain clean rice hulls;

(2) 0.6mol/L of ammonium titanate containing fluorine, 0.6mol/L of urea and 0.02 wt% of hydrogen peroxide are mixed according to the proportion of 2.2L: mixing 100g of the mixture with rinsed rice hulls, and soaking at 26 ℃ for 1h to obtain a composite material precursor; in the invention, hydrogen peroxide is used as a bleaching agent, and urea is used as a precipitator.

(3) Heating the reaction solution to 90 ℃, reacting for 3 hours, and filtering to obtain a photocatalytic composite material;

(4) and washing, drying and crushing the obtained photocatalytic composite material to obtain the biomass-based spherical anatase titanium dioxide granules.

As can be seen from fig. 2: the XRD spectrogram of the prepared composite material is matched with that of anatase titanium dioxide, and fig. 2 shows that characteristic peaks of rutile phase and brookite titanium dioxide are not found in the prepared sample, and a carbon atom peak is not found, possibly because a large amount of titanium dioxide nano particles are covered on the surface of a carbon material and grow at a specific position. Firstly, the titanium dioxide crystals are wrapped on the surface of the rice hulls, the rice hulls are barely exposed, so peaks are shielded by the titanium dioxide crystal peaks, and secondly, the peaks can be seen through an SEM picture, the substrate is the rice hulls, and the surfaces of the peaks are wrapped by a large number of titanium dioxide crystals.

The structure of the photocatalytic composite material was observed by using a field emission scanning electron microscope, and the result is shown in fig. 1. As can be seen from fig. 1: the surface of the rice hull is covered with a layer of spherical titanium dioxide nano particles, the special appearance of the surface of the rice hull provides a guiding condition for the formation of the titanium dioxide nano particles, and the structure of the finally obtained photocatalytic composite material is that spherical titanium dioxide is loaded on the surface of the flaky rice hull.

FIG. 3 shows the UV-VIS absorption spectrum of the photocatalytic composite material according to the present embodiment, and the result is shown in FIG. 3. As can be seen from fig. 3, the photocatalytic composite material absorbs in the entire uv-vis region, indicating that the photocatalytic composite material has some activity in the visible light.

The application of the photocatalytic composite material prepared in the embodiment to the simulation of industrial wastewater comprises the following steps:

ultrasonically dispersing 0.01g of the photocatalytic composite material into a 50mL beaker which is filled with 20mg/L methyl orange and is cooled by circulating water, sampling every 15 minutes under the irradiation of simulated visible light, measuring the ultraviolet-visible absorption spectrum of the photocatalytic composite material by using an ultraviolet-visible spectrophotometer, and observing the degradation condition of the photocatalytic composite material. The photocatalytic composite material of the example can degrade methyl orange to below 20% in 90 minutes under the excitation of visible light.

Example 2 a method of preparing a photocatalytic composite material:

(1) primarily shearing, cleaning and drying the rice straw to obtain clean rice straw;

(2) 0.15mol/L of ammonium fluotitanate, 0.3mol/L of urea and 0.01 wt% of hydrogen peroxide are mixed according to the proportion of 1.8L: mixing 100g of the mixture with rinsed straw, and soaking at 24 ℃ for 0.5h to obtain a composite material precursor;

(3) heating the reaction solution to 80 ℃, reacting for 0.5h, and filtering to obtain a photocatalytic composite material;

(4) and washing, drying and crushing the obtained photocatalytic composite material to obtain the biomass-based spherical anatase titanium dioxide granules.

The application of the photocatalytic composite material prepared in the embodiment to the simulation of industrial wastewater comprises the following steps:

ultrasonically dispersing 0.01g of the photocatalytic composite material into a 50mL beaker which is filled with 20mg/L methyl orange and is cooled by circulating water, sampling every 15 minutes under the irradiation of simulated visible light, measuring the ultraviolet-visible absorption spectrum of the photocatalytic composite material by using an ultraviolet-visible spectrophotometer, and observing the degradation condition of the photocatalytic composite material. The photocatalytic composite material of the example can degrade methyl orange to below 25% in 90 minutes under the excitation of visible light.

Example 3 a method of preparing a photocatalytic composite material:

(1) cleaning wheat bran, and drying to obtain clean wheat bran;

(2) 0.8mol/L sodium fluotitanate, 0.8mol/L urea and 0.025 wt% hydrogen peroxide are mixed according to the proportion of 2.5L: mixing 100g of the precursor with rinsed wheat bran, and soaking at 28 ℃ for 1.5h to obtain a composite material precursor;

(3) heating the reaction solution to 95 ℃, reacting for 4 hours, and filtering to obtain a photocatalytic composite material;

(4) and washing, drying and crushing the obtained photocatalytic composite material to obtain the biomass-based spherical anatase titanium dioxide granules.

The application of the photocatalytic composite material prepared in the embodiment to the simulation of industrial wastewater comprises the following steps:

ultrasonically dispersing 0.01g of the photocatalytic composite material into a 50mL beaker which is filled with 20mg/L methyl orange and is cooled by circulating water, sampling every 15 minutes under the irradiation of simulated visible light, measuring the ultraviolet-visible absorption spectrum of the photocatalytic composite material by using an ultraviolet-visible spectrophotometer, and observing the degradation condition of the photocatalytic composite material. The photocatalytic composite material of the example can degrade methyl orange to below 15% in 90 minutes under the excitation of visible light.

Example 4 a method of preparing a photocatalytic composite material:

(1) cleaning wheat straws, and drying to obtain clean wheat bran;

(2) 0.1mol/L of ammonium fluotitanate, 0.1mol/L of urea and 0.01 wt% of hydrogen peroxide are mixed according to the proportion of 1L: mixing 100g of the mixture with rinsed wheat straws, and soaking at 22 ℃ for 0.5h to obtain a composite material precursor;

(3) heating the reaction solution to 70 ℃, reacting for 0.5h, and filtering to obtain a photocatalytic composite material;

(4) and washing, drying and crushing the obtained photocatalytic composite material to obtain the biomass-based spherical anatase titanium dioxide granules.

Example 5 a method of preparing a photocatalytic composite material:

(1) cleaning wheat bran, and drying to obtain clean wheat bran;

(2) 1mol/L of sodium fluotitanate, 6.0mol/L of urea and 0.03 wt% of hydrogen peroxide are mixed according to the proportion of 3L: mixing 100g of the precursor with rinsed wheat bran, and soaking at 30 ℃ for 0.5h to obtain a composite material precursor;

(3) heating the reaction solution to 100 ℃, reacting for 0.5h, and filtering to obtain a photocatalytic composite material;

(4) and washing, drying and crushing the obtained photocatalytic composite material to obtain the biomass-based spherical anatase titanium dioxide granules.

Example 6 a method of preparing a photocatalytic composite material:

(1) cleaning and drying the rice hulls to obtain clean wheat hulls;

(2) 0.01mol/L of ammonium fluotitanate, 0.1mol/L of urea and 0.01 wt% of hydrogen peroxide are mixed according to the proportion of 1L: mixing 10g of the mixture with rinsed rice hulls, and soaking at 20 ℃ for 2 hours to obtain a composite material precursor;

(3) heating the reaction solution to 65 ℃, reacting for 5 hours, and filtering to obtain a photocatalytic composite material;

(4) and washing, drying and crushing the obtained photocatalytic composite material to obtain the biomass-based spherical anatase titanium dioxide granules.

Example 7: the biomass-based spherical anatase titanium dioxide particles prepared in examples 1 to 6 are filled into a circulating photocatalytic device to carry out photocatalytic degradation on industrial wastewater.

The circulating photocatalysis device adopted in the invention comprises a tank body 1, wherein the upper part of the tank body 1 is connected with a plate-shaped processing unit in a sliding manner, the top of the tank body 1 is provided with a light source 3, the light source 3 is arranged above the plate-shaped processing unit, the bottom of the tank body 1 is provided with a circulating groove 11, the bottom of the circulating groove 11 is provided with a water outlet 12, the water outlet 12 is provided with a circulating pipe 4, the upper end of the circulating pipe 4 is opened at the top of the tank body 1, and the middle part of the circulating pipe 4 is provided with a circulating pump 41.

The plate-shaped processing unit comprises a frame 2, wherein sliding strips 22 are arranged on two sides of the frame 2, the frame 2 is connected with the upper part of a tank body 1 in a sliding manner through the sliding strips 22, the bottom of the frame 2 is connected with a lower filter plate 21 in a sliding manner, the top surface of the frame 2 is detachably connected with an upper filter plate 28, a plurality of transverse partition plates 23 and longitudinal partition plates 27 are arranged in the frame 2, the inner part of the frame 2 is divided into a plurality of squares by the transverse partition plates 23 and the longitudinal partition plates 27, a light guide column 24 is arranged at the intersection of the transverse partition plates 23 and the longitudinal partition plates 27, the upper part of the light guide column 24 penetrates out of the upper filter plate 28 and is in sealed insertion connection with the upper filter plate 28, a light source 3 is arranged above the light guide column 24 and the upper filter plate 28, water baffles 26 are further arranged on four walls of the frame 2, water inlet holes 25 are arranged on the water baffles 26, the water inlet holes 25 are arranged above the upper filter plate 28, an upper end opening of the circulating pipe 4 is penetrated out through the water inlet holes 25, the circulation tank 11 is provided below the lower filter plate 21. The lower part of the light guide column 24 is in contact with biomass-based spherical anatase titanium dioxide particles in the square, and the light guide column 24, the transverse partition plate 23 and the longitudinal partition plate 27 are made of transparent plastics or transparent glass, so that light rays can be efficiently refracted and transmitted.

The specific process for carrying out photocatalytic treatment on industrial wastewater by utilizing the circulating photocatalytic device is as follows:

firstly, the upper filter plate 28 is taken down, the lower filter plate 21 is installed, biomass-based spherical anatase titanium dioxide particles are uniformly filled in the square grids, the upper filter plate 28 is covered, the upper filter plate 28 is provided with insertion holes corresponding to the light guide columns 24, the light guide columns 24 penetrate out of the insertion holes during insertion and are hermetically connected with the upper filter plate 28, and the assembled plate-shaped processing unit is inserted into the tank body 1, so that the assembling preparation of the device is completed.

When industrial wastewater is treated, the industrial wastewater is injected into the circulating tank 11, the industrial wastewater is pumped into the surface of the upper filter plate 28 from the circulating tank 11 through the circulating pipe 4 and the circulating pump 41, the water baffle 26 is used for storing the industrial wastewater with a certain depth, so that the industrial wastewater can uniformly and continuously pass through the plate-shaped treatment unit from top to bottom, but the depth of the industrial wastewater on the surface of the upper filter plate 28 is controlled, the top end of the light guide column 24 is flush with the water surface of the industrial wastewater or the top end of the light guide column 24 is higher than the water surface of the industrial wastewater, the light refraction effect of the light guide column 24 is prevented from being influenced after the industrial wastewater covers the light guide column 24, the light source 3 is turned on, the industrial wastewater continuously permeates and filters biomass-based spherical anatase-type titanium dioxide particles in the square grid at the moment, the light on the upper part of the light guide column 24 is introduced into the square grid around the light guide column through the refraction effect and irradiates the biomass-based spherical anatase titanium dioxide particles, and the irradiation intensity of the internal particles is greatly improved, provides favorable conditions for the granular materials to exert the photocatalytic degradation effect to the maximum extent. After the industrial wastewater is treated, the frame 2 is drawn out, and then the lower filter plate 21 is drawn out, so that the used granular materials can be conveniently removed or replaced.

The above embodiments are only for illustrating the technical idea of the present invention, and the protection scope of the present invention cannot be limited thereby, and any modification made on the basis of the technical scheme according to the technical idea proposed by the present invention falls within the protection scope of the present invention; the technology not related to the invention can be realized by the prior art.