SrBi2Ta2O9Application in photocatalytic degradation of antibiotics
阅读说明：本技术 SrBi2Ta2O9在光催化降解抗生素方面的应用 (SrBi2Ta2O9Application in photocatalytic degradation of antibiotics ) 是由 范晓芸 廖碧如 于 2021-07-14 设计创作，主要内容包括：本发明公开一种SrBi-(2)Ta-(2)O-(9)在光催化降解抗生素方面的应用,属于光催化领域,涉及水体污染治理领域。本发明以卤化盐(如KBr)作为助熔剂,通过熔盐法合成SrBi-(2)Ta-(2)O-(9),制备方法简单,价格低廉,可增强光捕获效率,研究表明SrBi-(2)Ta-(2)O-(9)在可见光下对四环素降解速率常数是原始SrBi-(2)Ta-(2)O-(9)的14倍,对环丙沙星的降解速率常数是原始SrBi-(2)Ta-(2)O-(9)的138倍,催化效率得到大幅提高,降解效率均可达100％,本发明的方法操作简单,成本低廉,降解效率高,具有较高的应用前景,可有效应用于处理水体环境中的抗生素,对解决环境污染问题以及保护生态环境方面具有较好的发展前景。(The invention discloses a SrBi 2 Ta 2 O 9 The application in the aspect of photocatalytic degradation of antibiotics belongs to the field of photocatalysis and relates to the field of water pollution treatment. The invention takes halide (such as KBr) as fluxing agent to synthesize SrBi by molten salt method 2 Ta 2 O 9 The preparation method is simple, the price is low, the light capture efficiency can be enhanced, and researches show that SrBi 2 Ta 2 O 9 In the visibleThe lower degradation rate constant for tetracycline is the original SrBi 2 Ta 2 O 9 14 times of that of ciprofloxacin, the degradation rate constant of ciprofloxacin is the original SrBi 2 Ta 2 O 9 138 times, the catalytic efficiency is greatly improved, the degradation efficiency can reach 100 percent, the method has the advantages of simple operation, low cost, high degradation efficiency and higher application prospect, can be effectively applied to the treatment of antibiotics in the water body environment, and has better development prospect in the aspects of solving the problem of environmental pollution and protecting the ecological environment.)
1.SrBi2Ta2O9The application in photocatalytic degradation of antibiotics.
2. Use according to claim 1, characterized in that: SrBi2Ta2O9The application in the aspect of photocatalytic degradation of antibiotics in water bodies.
3. Use according to claim 1, characterized in that:
the antibiotic is at least one of tetracycline antibiotics and quinolone antibiotics.
4. Use according to claim 3, characterized in that:
the tetracycline antibiotic is at least one of tetracycline and oxytetracycline; the quinolone antibiotic is at least one of ciprofloxacin and norfloxacin.
5. Use according to any one of claims 1 to 4, characterized in that:
the light is ultraviolet-visible light.
6. Use according to any one of claims 1 to 4, characterized in that:
the SrBi2Ta2O9The SrBi is synthesized by a molten salt method by taking a halogenated salt as a fluxing agent2Ta2O9。
7. Use according to claim 6, characterized in that:
the halide salt is at least one of KCl, NaCl, NaBr and KBr;
the mass ratio of the fluxing agent to the raw material is 0.1-2, and the raw material is Bi2O3、SrCO3、Ta2O5。
8. By using SrBi2Ta2O9The method for degrading the antibiotic by photocatalysis is characterized by comprising the following steps: the method comprises the following steps:
(1) dissolving and diluting antibiotics in water, and performing ultrasonic treatment to obtain a solution A;
(2) under dark condition, SrBi2Ta2O9Adding the solution A in the step (1), and stirring and mixing to obtain a mixed solution;
(3) and (3) irradiating the mixed solution obtained in the step (2) under ultraviolet-visible light, and stirring to degrade the antibiotics.
9. The method of claim 8, wherein:
the antibiotic in the step (1) is at least one of tetracycline antibiotic and quinolone antibiotic;
the concentration of the antibiotics in the solution A in the step (1) is 5-800 mg/L;
the ultrasonic time of the ultrasonic wave in the step (1) is 5-10 min, and the ultrasonic frequency is 40 kHz;
the SrBi in the step (2)2Ta2O9The mass-volume ratio of the addition amount of (A) to the solution A is 0.5-80 mg/mL;
stirring time of the stirring in the step (2) is 30-60 min, and stirring speed is 400-600 rpm;
the irradiation wavelength lambda of the ultraviolet-visible light in the step (3) is more than or equal to 200nm, and the energy density of the light is 0.05-0.22W/cm2；
The irradiation time of the ultraviolet-visible light in the step (3) is 10min to 150 min;
and (4) stirring in the step (3) at the rotating speed of 400-600 rpm.
10. The method of claim 9, wherein:
the tetracycline antibiotic is at least one of tetracycline and oxytetracycline; the quinolone antibiotic is at least one of ciprofloxacin and norfloxacin;
the concentration of the antibiotics in the solution A in the step (1) is 10-100 mg/L;
the ultrasonic time of the ultrasonic wave in the step (1) is 5min, and the ultrasonic frequency is 40 kHz;
the SrBi in the step (2)2Ta2O9The mass-volume ratio of the addition amount of (A) to the solution A is 0.5-1 mg/mL;
stirring time of the stirring in the step (2) is 30min, and stirring speed is 600 rpm;
the energy density of the ultraviolet-visible light in the step (3) is 0.15-0.22W/cm2；
The irradiation time of the ultraviolet-visible light in the step (3) is 10-60 min;
the rotating speed of the stirring in the step (3) is 600 rpm.
Technical Field
The invention belongs to the field of photocatalysis, relates to the field of water pollution treatment, and particularly relates to SrBi2Ta2O9The application in photocatalytic degradation of antibiotics.
Background
The rapid development of the science and technology society brings convenience to the life of people, but the problem of environmental pollution is increasingly remarkable. Among them, water environmental pollution related to human health is a great concern. The random abuse and discharge of antibiotics widely applied to medical treatment and livestock breeding enables residual antibiotics to be detected in water, which can cause the drug resistance of microorganisms to be enhanced, and a large amount of drug-resistant bacteria are generated in the ecological environment, thus causing the difficulty in governing chemistry and the unbalance of the ecological system. Tetracycline and ciprofloxacin have been the most commonly used antibiotics due to their high antibacterial activity. However, due to their high hydrophilicity and stability, they easily aggregate and hardly decompose. At present, water body pollution treatment methods are various, but traditional methods such as physical adsorption, coagulation and membrane separation have high cost, may cause secondary pollution and cannot achieve the purpose of effectively removing pollutants; the biodegradation method for treating water body pollution by utilizing microbial activity has long treatment time period, has no general degradability on antibiotics, and inhibits the growth of microorganisms due to high toxicity of pollutants, thereby hindering the application of the microorganisms; the chemical oxidation method has the problems of high cost, low yield, incapability of realizing complete mineralization of pollutants and the like.
The photocatalysis technology utilizes solar energy to generate electrons and holes to degrade organic pollutants in the environment into carbon dioxide, water and other inorganic salt micromolecules, has the advantages of high degradation efficiency, low cost, no secondary pollution, strong stability and the like, and is a method for degrading the organic pollutants with a very promising prospect. Today, there is a great deal of research into existing photocatalytic materials (e.g., TiO)2、g-C3N4BiOI) to improve the photocatalytic performance, for example, patent CN110217850A provides a preparation method of a monovalent copper ion modified carbon nitride framework porous material, which is developed through photocatalytic degradation experimental researchThe material can effectively degrade antibiotics, but the method still has the defects of low sunlight utilization rate, low separation efficiency of photo-generated electron hole pairs, low adsorption selectivity and the like, and the defects are also the main problems of hindering the development of the photocatalysis technology. Therefore, there is a need to develop a semiconductor photocatalytic material and a method that can effectively transport electron holes, have simple preparation, and can efficiently degrade pollutants.
Disclosure of Invention
In order to overcome the defects of the prior art, the invention aims to provide SrBi2Ta2O9The application in photocatalytic degradation of antibiotics.
It is another object of the present invention to provide a method for using SrBi2Ta2O9A method for photocatalytic degradation of antibiotics.
The invention synthesizes SrBi by a molten salt growth method2Ta2O9Research shows that SrBi is used in photocatalytic degradation of antibiotics in waste water2Ta2O9The degradation rate of tetracycline and ciprofloxacin can approach 100%.
It is still another object of the present invention to provide a method for synthesizing SrBi by molten salt method using halogenated salt (such as KBr) as flux2Ta2O9The method of (1).
The purpose of the invention is realized by the following technical scheme:
the invention provides SrBi2Ta2O9The application in photocatalytic degradation of antibiotics.
Preferably, SrBi2Ta2O9The application in the aspect of photocatalytic degradation of antibiotics in water bodies.
Preferably, the light is uv-visible light.
Preferably, the wavelength of the light is 200 to 780 nm.
Preferably, the antibiotic is at least one of tetracycline antibiotics and quinolone antibiotics; further, the tetracycline antibiotic is at least one of tetracycline and oxytetracycline; the quinolone antibiotic is at least one of ciprofloxacin and norfloxacin.
Preferably, the SrBi2Ta2O9The SrBi is synthesized by a molten salt method by taking a halogenated salt as a fluxing agent2Ta2O9。
The halide salt is at least one of KCl, NaCl, NaBr and KBr, and is further KBr.
Preferably, the mass ratio of the fluxing agent to the raw material is 0.1-2, and the raw material is Bi2O3、SrCO3、Ta2O5。
Further preferably, the mass ratio of the flux to the raw material is 1.
The research of the invention shows that SrBi2Ta2O9The degradation rate of tetracycline and ciprofloxacin can approach 100%.
In addition, the invention also provides a method for utilizing SrBi2Ta2O9The method for degrading the antibiotic by photocatalysis comprises the following steps:
(1) dissolving and diluting antibiotics in water, and performing ultrasonic treatment to obtain a solution A;
(2) under dark condition, SrBi2Ta2O9Adding the solution A in the step (1), and stirring and mixing to obtain a mixed solution;
(3) and (3) irradiating the mixed solution obtained in the step (2) under ultraviolet-visible light and stirring to degrade the antibiotic.
Preferably, the antibiotic in step (1) is at least one of tetracycline antibiotic and quinolone antibiotic; further, the tetracycline antibiotic is at least one of tetracycline and oxytetracycline; the quinolone antibiotic is at least one of ciprofloxacin and norfloxacin.
Preferably, the concentration of the antibiotic in the solution A in the step (1) is 5-800 mg/L.
If the concentration of the antibiotic solution is higher than 800mg/L, light absorption is hindered, resulting in a decrease in the efficiency of photocatalytic degradation of the antibiotic.
Further preferably, the concentration of the antibiotic in the solution A in the step (1) is 10-100 mg/L, and further 10 mg/L.
Preferably, the ultrasonic time of the ultrasonic treatment in the step (1) is 5-10 min, and the ultrasonic frequency is 40 kHz; furthermore, the ultrasonic time is 5min, and the ultrasonic frequency is 40 kHz.
Preferably, the SrBi in the step (2)2Ta2O9The mass-to-volume ratio of the addition amount of (A) to the solution A is 0.5-80 mg/mL.
If it is the SrBi2Ta2O9The addition amount of (A) to the solution A in a mass-to-volume ratio of more than 80mg/mL may hinder the photocatalytic activity and the antibiotic activity sites, resulting in a decrease in the efficiency of photocatalytic degradation of the antibiotic.
Further preferably, the SrBi in the step (2)2Ta2O9The mass-volume ratio of the addition amount of (A) to the solution A is 0.5-1 mg/mL; still further, the concentration of the compound was 1 mg/mL.
Preferably, the stirring time of the stirring in the step (2) is 30-60 min, and the stirring speed is 400-600 rpm.
Further preferably, the stirring time of the stirring in the step (2) is 30min, and the stirring speed is 600 rpm.
Preferably, the uv-vis light of step (3) is provided by a xenon lamp.
Preferably, the irradiation wavelength lambda of the ultraviolet-visible light in the step (3) is more than or equal to 200nm (preferably, 200nm is more than or equal to lambda is less than or equal to 780 nm; further, 380nm is more than or equal to lambda is less than or equal to 780nm), and the energy density of the light is 0.05-0.22W/cm2。
When the irradiation wavelength lambda of the ultraviolet-visible light in the step (3) is more than or equal to 200nm, the antibiotic can be subjected to self photolysis and SrBi due to the existence of multiple lights such as ultraviolet light and the like2Ta2O9The photocatalytic degradation plays a synergistic role and effectively improves SrBi2Ta2O9Efficiency of degradation of antibiotics.
More preferably, the energy density of the light is 0.15 to 0.22W/cm2Further, it is 0.22W/cm2。
When the energy density of light is 0.22W/cm2When the scheme is used, the degradation rate of the scheme to the antibiotics is connectedNearly 100%, therefore, even though the degradation time can be shortened by further increasing the energy density of light, the actual effect is not so great, but the service life of the xenon lamp can be shortened, and the degradation cost is increased.
Preferably, the irradiation time of the ultraviolet-visible light in the step (3) is 10-150 min, and further 10-60 min; further 30-60 min; further 60 min.
Preferably, the rotating speed of the stirring in the step (3) is 400-600 rpm; further 600 rpm.
As a best possible embodiment, the above uses SrBi2Ta2O9The method for degrading the antibiotic by photocatalysis comprises the following steps:
(1) weighing a certain mass of Bi2O3、SrCO3、Ta2O5Adding the components in a mass ratio of 1: 1 KBr as fluxing agent, and synthesizing SrBi by molten salt method2Ta2O9；
(2) Dissolving and diluting the antibiotic in water to the concentration of 10mg/L, and ultrasonically mixing for 5min at the frequency of 40kHz to obtain a solution A;
(3) under dark conditions, the mass-to-volume ratio of SrBi to the solution A is 1000mg/L2Ta2O9Adding the mixed solution into the solution A obtained in the step (2) and stirring the mixed solution for 30min at the speed of 600rpm to achieve saturated adsorption, thus obtaining a mixed solution;
(4) placing the mixed solution obtained in the step (3) in a xenon lamp (the emission wavelength lambda is more than or equal to 200nm, and the energy density of light is 0.22W/cm2) And irradiating for 60min to effectively degrade the antibiotic.
Compared with the prior art, the invention has the following advantages and effects:
the invention synthesizes SrBi by a molten salt growth method2Ta2O9The light capture efficiency can be enhanced, and research shows that SrBi2Ta2O9The efficiency of degrading tetracycline and ciprofloxacin under visible light can reach 100 percent, the method has the advantages of simple operation, low cost, high degradation efficiency and higher application prospect, can be effectively applied to the treatment of antibiotics in the water environment, and solves the problem of environmental pollutionHas better development prospect in the aspects of dyeing problems and protecting the ecological environment. The method comprises the following specific steps:
(1) the invention takes halide (such as KBr) as fluxing agent to synthesize SrBi by molten salt method2Ta2O9The preparation method is simple and the price is low.
(2) SrBi prepared by the invention2Ta2O9SrBi synthesized by molten salt method by degrading tetracycline and ciprofloxacin through catalyst2Ta2O9The degradation rate constant for tetracycline is the original SrBi2Ta2O914 times of that of ciprofloxacin, the degradation rate constant of ciprofloxacin is the original SrBi2Ta2O9138 times of the catalyst, the catalytic efficiency is greatly improved.
Drawings
FIG. 1 shows the synthesis of SrBi with KBr as flux in example 12Ta2O9XRD pattern of the X-ray diffraction peak in comparison with the standard card.
FIG. 2 shows SrBi synthesized by the molten salt method in examples 1 and 22Ta2O9With the original SrBi2Ta2O9A graph of tetracycline degradation under visible light (λ < 420nm < 780 nm).
FIG. 3 shows SrBi synthesized by the molten salt method in examples 10 and 112Ta2O9With the original SrBi2Ta2O9Graph of degradation of ciprofloxacin under visible light (lambda is more than 420nm and less than or equal to 780 nm).
Detailed Description
The present invention will be described in further detail with reference to examples and drawings, but the present invention is not limited thereto. Reagents, methods and apparatus used in the present invention are conventional in the art unless otherwise indicated.
Unless otherwise indicated, reagents and materials used in the following examples are commercially available.
Example 1A method of using SrBi2Ta2O9Method for degrading tetracycline through photocatalysis
1. Experimental methods
(1) Weighing a certain mass of raw material Bi2O3、SrCO3、Ta2O5In a ball milling tank, weighing the raw materials according to the mass ratio of 1: 1, mixing and ball-milling the mixture for 30min with KBr serving as a fluxing agent, transferring the mixture into a crucible, and calcining the crucible in a muffle furnace to synthesize SrBi2Ta2O9The calcination conditions were as follows: firstly calcining for 4h at 700 ℃, then heating to 900 ℃ at the speed of 5 ℃/min, and then continuously calcining for 4h at 900 ℃; taking out the SrBi and putting the SrBi into a ball milling tank for grinding for 10min at certain time intervals to obtain the SrBi synthesized by a molten salt method2Ta2O9And recording as the molten salt method for synthesizing SBTA. SrBi synthesized by taking KBr as fluxing agent2Ta2O9The XRD pattern of the X-ray diffraction peak of (A) is shown in figure 1 in comparison with a standard card.
(2) Putting 1mg of tetracycline into a beaker with the volume of 250mL, adding pure water to dissolve and dilute the tetracycline to the concentration of 10ppm (10mg/L), and putting the tetracycline into an ultrasonic cleaning machine to ultrasonically mix for 5min at the frequency of 40kHz to obtain uniform and stable solution A;
(3) under the dark condition, adding 100mg of SBTA synthesized by a molten salt method (the mass-volume ratio of the SBTA to the solution A is 1mg/mL) into the solution A obtained in the step (2), and magnetically stirring at the speed of 600rpm for 30min to obtain a mixed solution;
(4) placing the mixed solution obtained in the step (3) in a xenon lamp (the emission wavelength is more than 420nm and less than or equal to 780nm, and the energy density of light is 0.22W/cm2The diameter of a light spot is 130mm, the distance between the liquid level of the solution and the outlet of a xenon lamp is 20cm), the irradiation is carried out for 60min, the sampling time is 10min at intervals, and the solution is stirred and mixed at 600rpm, so that the antibiotic can be degraded.
And after irradiating for 60min, centrifuging a certain amount of mixed solution, taking supernate, filtering by a filter membrane, and performing high performance liquid chromatography to obtain the degradation rate of the antibiotic.
2. Results of the experiment
As shown in FIG. 2, the above method according to the present invention can achieve a degradation rate of nearly 100% after 30min of photocatalytic degradation of antibiotics.
Example 2A method of using SrBi2Ta2O9Method for degrading tetracycline through photocatalysis
1. Experimental methods
The same protocol as in example 1, except that the molten salt synthesis of SBTA added in step (3) was replaced with the original SBTA.
Pristine SBTA (i.e., pristine SrBi)2Ta2O9) The preparation steps are as follows: weighing a certain mass of raw material Bi2O3、SrCO3、Ta2O5Mixing and ball-milling in a ball-milling tank for 30min, and calcining in a muffle furnace to synthesize original SrBi2Ta2O9The calcination conditions were as follows: firstly calcining for 4h at 900 ℃, then heating to 1100 ℃ at the speed of 5 ℃/min, and then continuously calcining for 4h at 1100 ℃; taking out the SrBi and putting the SrBi into a ball milling tank for grinding for 10min at certain time intervals to obtain the SrBi synthesized by a solid phase method2Ta2O9Denoted as original SBTA.
2. Results of the experiment
As shown in FIG. 2, the above method according to the present invention can achieve a degradation rate of 21% after 30min of photocatalytic degradation of tetracycline.
The photocatalytic degradation of the invention conforms to the equation of quasi-first order reaction kinetics, so the calculation formula of the rate constant is as follows: lnC0lnC + kt. Wherein, C0Is the initial concentration, C is the concentration at each time point, k is the rate constant, and t is the time.
The method comprises the following steps: first, ln (C) is calculated0C), then ln (C)0The slope obtained is k by plotting/C) against t. By calculation, the rate constant of SBTA synthesized by the molten salt method in example 1 under the condition of 30 minutes tetracycline degradation is 0.1381min-1In example 2, the rate constant of the original SBTA at 30 minutes was 0.00962min-1. As can be seen, the degradation rate constant of SBTA synthesized by the molten salt method to tetracycline is 14 times that of the original SBTA.
Example 3A method of using SrBi2Ta2O9Method for degrading tetracycline through photocatalysis
1. Experimental methods
The same procedure as in example 1, except that the flux added in step (1) was KCl.
2. Results of the experiment
According to the method, the degradation rate of 93 percent can be achieved after 30min of photocatalytic degradation of tetracycline.
Example 4A method of using SrBi2Ta2O9Method for degrading tetracycline through photocatalysis
1. Experimental methods
The same procedure as in example 1, except that the flux added in step (1) was NaCl.
2. Results of the experiment
According to the method, the degradation rate of 80% can be reached after 30min of photocatalytic degradation of tetracycline.
Example 5A method of using SrBi2Ta2O9Method for degrading tetracycline through photocatalysis
1. Experimental methods
The same procedure as in example 1, except that the flux added in step (1) was NaBr.
2. Results of the experiment
According to the method, the degradation rate of 60% can be achieved after 30min of photocatalytic degradation of tetracycline.
Example 6A method of using SrBi2Ta2O9Method for degrading tetracycline through photocatalysis
1. Experimental methods
The protocol of example 1 was followed except that the concentration of tetracycline was 50ppm (50 mg/L).
2. Results of the experiment
According to the method, 20% of degradation rate can be achieved after 30min of photocatalytic degradation of tetracycline.
Example 7A method of using SrBi2Ta2O9Method for degrading tetracycline through photocatalysis
1. Experimental methods
The same procedure as in example 1 was repeated, except that SBTA was added in an amount of 50mg (in a mass-to-volume ratio of 0.5mg/mL to the solution A) by the molten salt method.
2. Results of the experiment
According to the method, the degradation rate of 74 percent can be achieved after 30min of photocatalytic degradation of tetracycline.
Example 8A method of using SrBi2Ta2O9Method for degrading tetracycline through photocatalysis
1. Experimental methods
The same protocol as in example 1, except that the irradiation time in step (4) was 10 min.
2. Results of the experiment
According to the method, the degradation rate of 90% can be reached after the tetracycline is degraded in a photocatalytic manner for 10 min.
Example 9A method of using SrBi2Ta2O9Method for degrading tetracycline through photocatalysis
1. Experimental methods
The same procedure as in example 1, except that the energy density of light was 0.15W/cm2The diameter of a light spot is 150mm, and the distance between the liquid surface of the solution and the outlet of the xenon lamp is 26 cm.
2. Results of the experiment
According to the method, the degradation rate of 70% can be achieved after 30min of photocatalytic degradation of tetracycline.
Example 10A method of using SrBi2Ta2O9Method for degrading ciprofloxacin by photocatalysis
1. Experimental methods
The same protocol as example 1 except that the tetracycline was replaced with ciprofloxacin, the concentration of ciprofloxacin was 10ppm (10mg/L), the amount of SBTA synthesized by the molten salt method was 100mg (the mass-to-volume ratio to solution A was 1000mg/L), and the optical energy density was 0.22W/cm2。
2. Results of the experiment
As shown in FIG. 3, the method of the present invention can reach a degradation rate close to 100% after the ciprofloxacin is degraded by photocatalysis for 60 min.
Example 11A method of using SrBi2Ta2O9Method for degrading ciprofloxacin by photocatalysis
1. Experimental methods
The same protocol as example 1 except that in step (2) the tetracycline is replaced by ciprofloxacin, cyclopropylThe concentration of the saxabexate is 10ppm (10mg/L), the SBTA synthesized by the molten salt method added in the step (3) is replaced by the original SBTA, the addition amount of the original SBTA is 100mg (the mass-volume ratio of the original SBTA to the solution A is 1000mg/L), and the light energy density is 0.22W/cm2. The original SBTA was prepared as in example 2.
2. Results of the experiment
As a result, as shown in FIG. 3, the degradation rate of 1% was achieved after 60min of photocatalytic degradation of ciprofloxacin according to the method of the present invention.
Referring to the calculation mode of the rate constant in example 2, the rate constant of the degradation of ciprofloxacin in 60 minutes in the molten salt method for synthesizing SBTA in example 10 is 0.0454min-1(ii) a The rate constant of the original SBTA at 60 minutes in example 11 was 0.0003289min-1. As can be seen, the degradation rate constant of the SBTA synthesized by the molten salt method on ciprofloxacin is 138 times that of the original SBTA.
Example 12A method of using SrBi2Ta2O9Method for degrading ciprofloxacin by photocatalysis
1. Experimental methods
The same protocol as example 1, except that the fluxing agent KCl was used in the step (1), the tetracycline was replaced with ciprofloxacin in the step (2), the concentration of ciprofloxacin was 10ppm (10mg/L), the amount of SBTA synthesized by the molten salt method was 100mg (the ratio of the mass to the volume of the solution A was 1000mg/L), and the optical energy density was 0.22W/cm2。
2. Results of the experiment
According to the method, the degradation rate of the ciprofloxacin can reach nearly 70% after the ciprofloxacin is degraded in a photocatalytic manner for 60 min.
Example 13A method of using SrBi2Ta2O9Method for degrading ciprofloxacin by photocatalysis
1. Experimental methods
The same protocol as example 1, except that NaCl was used as a flux in step (1), that ciprofloxacin was used in place of tetracycline in step (2), that the concentration of ciprofloxacin was 10ppm (10mg/L), that 100mg of SBTA was added in the molten salt method (1000mg/L as a mass-to-volume ratio to solution A), and that the optical energy density was 0.22W/cm2。
2. Results of the experiment
According to the method, the degradation rate of the ciprofloxacin can reach nearly 30% after the ciprofloxacin is degraded in a photocatalytic manner for 60 min.
Example 14A method of using SrBi2Ta2O9Method for degrading ciprofloxacin by photocatalysis
1. Experimental methods
The same protocol as example 1, except that the fluxing agent added in step (1) was NaBr, the tetracycline in step (2) was replaced by ciprofloxacin, the concentration of ciprofloxacin was 10ppm (10mg/L), the addition amount of SBTA synthesized by the molten salt method was 100mg (the mass-to-volume ratio to solution A was 1000mg/L), and the optical energy density was 0.22W/cm2。
2. Results of the experiment
According to the method, the degradation rate of the ciprofloxacin can reach nearly 50% after the ciprofloxacin is degraded in a photocatalytic manner for 60 min.
Example 15A method of using SrBi2Ta2O9Method for degrading ciprofloxacin by photocatalysis
1. Experimental methods
The same protocol as example 1 except that the tetracycline was replaced with ciprofloxacin, the concentration of ciprofloxacin was 50ppm (50mg/L), the amount of SBTA synthesized by the molten salt method was 100mg (the mass-to-volume ratio to solution A was 1000mg/L), and the optical energy density was 0.22W/cm2。
2. Results of the experiment
According to the method, the degradation rate of 18% can be achieved after the ciprofloxacin is degraded in a photocatalytic manner for 60 min.
Example 16A method of using SrBi2Ta2O9Method for degrading ciprofloxacin by photocatalysis
1. Experimental methods
The same protocol as example 1 except that the tetracycline was replaced with ciprofloxacin, the concentration of ciprofloxacin was 10ppm (10mg/L), the amount of SBTA synthesized by the molten salt method was 50mg (the mass-to-volume ratio to solution A was 500mg/L), and the optical energy density was 0.22W/cm2。
2. Results of the experiment
According to the method, the degradation rate of 60 percent can be achieved after the ciprofloxacin is degraded in a photocatalytic manner for 60 min.
Example 17A method of using SrBi2Ta2O9Method for degrading ciprofloxacin by photocatalysis
1. Experimental methods
The same protocol as example 1 except that the tetracycline was replaced with ciprofloxacin, the concentration of ciprofloxacin was 10ppm (10mg/L), the amount of SBTA synthesized by the molten salt method was 100mg (the mass-to-volume ratio to solution A was 1000mg/L), and the optical energy density was 0.15W/cm2The diameter of a light spot is 150mm, and the distance between the liquid surface of the solution and the outlet of the xenon lamp is 26 cm.
2. Results of the experiment
According to the method, the degradation rate of 62% can be achieved after the ciprofloxacin is degraded in a photocatalytic manner for 60 min.
Comparative example 1
1. Experimental methods
The protocol of example 1 is identical except that the concentration of tetracycline is 1000ppm (1000 mg/L).
2. Results of the experiment
According to the method, the degradation rate is only 2% after the tetracycline is degraded in a photocatalytic manner for 30 min.
Comparative example 2
1. Experimental methods
The same procedure as in example 1 was repeated, except that SBTA was added in an amount of 10mg (in a mass-to-volume ratio of 0.1mg/mL to the solution A) by the molten salt method.
2. Results of the experiment
According to the method, the degradation rate is only 20 percent after the tetracycline is degraded in a photocatalytic manner for 30 min.
Comparative example 3
1. Experimental methods
The procedure is the same as in example 1, except that no xenon lamp radiation is used in step (4).
2. Results of the experiment
According to the method, the degradation rate is only 2% after the tetracycline is degraded in a photocatalytic manner for 30 min.
The above embodiments are preferred embodiments of the present invention, but the present invention is not limited to the above embodiments, and any other changes, modifications, substitutions, combinations, and simplifications which do not depart from the spirit and principle of the present invention should be construed as equivalents thereof, and all such changes, modifications, substitutions, combinations, and simplifications are intended to be included in the scope of the present invention.