阅读说明：本技术 一种TaON/Ag3VO4/泡沫镍光催化膜及其制备方法和应用 (TaON/Ag3VO4Foamed nickel photocatalytic film and preparation method and application thereof ) 是由 王少莽 于 2020-07-01 设计创作，主要内容包括：本发明属于光催化环境污染物净化技术领域,具体涉及一种TaON/Ag<Sub>3</Sub>VO<Sub>4</Sub>/泡沫镍光催化膜及其制备方法和应用。将球磨均匀的TaON和Ag<Sub>3</Sub>VO<Sub>4</Sub>混合粉体加入乙酰丙酮-碘溶液中,利用电沉积技术将其固载在泡沫镍上,获得了一种新型高效TaON/Ag<Sub>3</Sub>VO<Sub>4</Sub>/泡沫镍光催化膜。将其用于染料废水治理中的光催化降解品红溶液的结果显示,12％TaON/Ag<Sub>3</Sub>VO<Sub>4</Sub>/泡沫镍光催化膜活性最高,在72W LED白光照射1h后,其对50mL、10mg/L品红溶液的降解效率分别为TaON/泡沫镍和Ag<Sub>3</Sub>VO<Sub>4</Sub>/泡沫镍的4.6和1.1倍。(The invention belongs to the technical field of photocatalytic environmental pollutant purification, and particularly relates to TaON/Ag 3 VO 4 Foamed nickel photocatalytic film and its preparation process and application. Uniformly ball-milling TaON and Ag 3 VO 4 Adding the mixed powder into acetylacetone-iodine solution, and immobilizing the mixed powder on foamed nickel by using an electrodeposition technology to obtain novel high-efficiency TaON/Ag 3 VO 4 Foamed nickel photocatalytic film. The results of using it in a photocatalytic degradation magenta solution in dye wastewater treatment showed 12% TaON/Ag 3 VO 4 The photocatalytic film of foamed nickel has the highest activity, and after a 72W LED is irradiated for 1 hour in white light, the degradation efficiencies of the photocatalytic film to 50mL and 10mg/L fuchsin solutions are TaON/foamed nickel and Ag respectively 3 VO 4 4.6 and 1.1 times of nickel foam.)

1. TaON/Ag₃VO₄The preparation method of the foamed nickel photocatalytic film is characterized by comprising the following steps:

uniformly ball-milling TaON/Ag₃VO₄Mixing the powder, adding into acetylacetone solution containing iodine, performing ultrasonic treatment for 0.5 hr, performing electrodeposition with foamed nickel as substrate, and drying to obtain TaON/Ag₃VO₄Foamed nickel photocatalytic film.

2. TaON/Ag according to claim 1₃VO₄The preparation method of the foamed nickel photocatalytic film is characterized in that a ball mill is utilized to perform ball milling for 2 hours at the rotating speed of 500r/min to obtain TaON/Ag with the particle size of 200 meshes₃VO₄Mixing the powder.

3. TaON/Ag according to claim 1₃VO₄The preparation method of the foamed nickel photocatalytic film is characterized in that TaON is in TaON/Ag₃VO₄The mass ratio of the mixed powder is 6-14%.

4. TaON/Ag according to claim 1₃VO₄The preparation method of the foamed nickel photocatalytic film is characterized in that in an iodine-containing acetylacetone solution, the mass-volume ratio of iodine to acetylacetone is as follows: 1-3: 6-10 mg/ml.

5. TaON/Ag according to claim 1₃VO₄The preparation method of the foamed nickel photocatalytic film is characterized in that TaON/Ag₃VO₄The mass-volume ratio of the mixed powder to the iodine-containing acetylacetone solution is 10-50: 3-5 mg/ml.

6. TaON/Ag according to claim 1₃VO₄Preparation of foamed nickel photocatalytic filmThe preparation method is characterized in that the size of the foamed nickel is 30mm × 30mm, 30mm × 1mm and the loading capacity of the mixed powder is 50 mg.

7. TaON/Ag according to claim 1₃VO₄The preparation method of the foamed nickel photocatalytic film is characterized in that the voltage of electrodeposition is as follows: 12-15V, and the deposition time is 2-6 min.

8. TaON/Ag prepared by the method of claim 1₃VO₄Foamed nickel photocatalytic film.

9. TaON/Ag prepared by the method of claim 1₃VO₄The foamed nickel photocatalytic film is used for dye degradation in water.

Technical Field

The invention belongs to the technical field of photocatalytic environmental pollutant purification, and particularly relates to TaON/Ag₃VO₄Foamed nickel photocatalytic film and its preparation process and application.

Background

The photocatalysis technology eliminates pollutants in the environment, and is a hotspot of research because of hopeful use of solar energy, mild reaction conditions, low emission and the like. However, the lack of highly efficient photocatalytic materials limits the practical application of this technology.

In recent years, researchers have discovered Ag₃VO₄And two photocatalytic materials with good visible light absorption, namely TaON, have higher activity of photocatalytic degradation of organic pollutants. Yet pure Ag₃VO₄And TaON have low separation efficiency of photo-generated electron-hole pairs under light excitation, so that the photocatalytic activity of the TaON is not outstanding.

Although some researchers will use Ag₃VO₄With other powders, e.g. Fe₂O₃、Ag₂S、Y₂O₃Etc. are compounded separately, or TaON and Mo are compounded₂S、Bi₂O₃、Ta₃N₅The equal parts are respectively compounded to obtain purer Ag₃VO₄Or composites with higher TaON activity, however the photocatalytic properties of these composites still have difficulties meeting practical requirements.

In addition, currently Ag₃VO₄The base or TaON base composite photocatalytic material is basically powder. In the actual use process, the problems of easy agglomeration, loss, difficult recovery and recycling and the like exist, so that the industrial application of the composite material is difficult.

Disclosure of Invention

To solve the problem of pure TaON and Ag₃VO₄Does not stand out from the photocatalytic activity of, and TaON or Ag₃VO₄The invention solves the problem that the base composite photocatalytic powder material is difficult to be applied industrially, and the invention uses a proper amount of TaON and Ag₃VO₄Compounding, and fixing the mixture on a foamed nickel substrate by utilizing an electrophoretic deposition technology to construct a novel high-efficiency TaON/Ag₃VO₄Foamed nickel photocatalytic film.

Novel efficient TaON/Ag₃VO₄The preparation method of the foamed nickel photocatalytic film comprises the following steps:

(1) AgNO is added₃Dropping Na into the aqueous solution₃VO₄In the water solution, reacting for 3-5h under magnetic stirring in the dark, filtering the sample suspension, washing with deionized water for 2-3 times, and drying at 80-120 deg.C to obtain Ag₃VO₄And (3) powder.

The further reaction time was 4h and the stoving temperature was 100 ℃.

(2) Weighing an appropriate amount of Ta₂O₅Placing the mixture into an alumina crucible, placing the alumina crucible into a tube furnace, and introducing NH at the flow rate of 100-200mL/min₃And heating the furnace temperature to 850-950 ℃ at the heating rate of 10 ℃/min, nitriding for 2-4h, and cooling to room temperature to obtain TaON powder.

Further, NH₃The flow rate is 175mL/min, the nitriding temperature is 900 ℃, and the time is 3 h.

(3) Weighing and measuring TaON and Ag₃VO₄Putting the powder into a ball milling tank, ball milling for 2h at the rotating speed of 500r/min, and sieving the mixed powder by a 200-mesh sieve for later use.

Wherein TaON is in TaON/Ag₃VO₄The mass ratio of the mixed powder is 6-14%.

(4) Preparation of TaON/Ag₃VO₄Foamed nickel photocatalytic film.

Placing the cut foam nickel (30mm × 30mm × 1mm) into 1-3mol/L dilute hydrochloric acid for ultrasonic soaking for 5-30min to remove surface impurities, washing with deionized water to be neutral, drying for later use, measuring 30-50mL acetylacetone, pouring into a beaker, adding 100-500mg TaON/Ag₃VO₄And 5-15mg of iodine simple substance, and carrying out ultrasonic treatment for 0.5 h. Then clamping two pieces of standby foam nickel on an electrode clamp at a distance of 1cm, putting the foam nickel into an acetylacetone solution, depositing for 2-6min under 12-15V direct current voltage, and drying to obtain TaON/Ag₃VO₄Foamed nickel photocatalytic film.

Further, the deposition voltage is 15V, and the deposition time is 5 min.

TaON/Ag prepared by the method₃VO₄Preparing 50mL of 10mg/L fuchsin aqueous solution, pouring the solution into a 100mL photocatalytic reactor, putting the reactor on a magnetic stirrer with 4 white LED light source plates (18W/LED light source plate × 4 is 72W) around, and carrying out the steps of preparing TaON/Ag₃VO₄Suspending the foamed nickel photocatalytic film above the solution, magnetically stirring for 1h in the dark, turning on the light source, and performing photocatalytic degradation reactionThen, 4mL of the solution was taken every 1 hour, and the absorbance of the solution was measured by a photometer to calculate the degradation rate of fuchsin. TaON/Ag after one round of use₃VO₄The foamed nickel photocatalysis film is washed by deionized water and dried, and then the next round of degradation reaction is carried out.

The beneficial effects are as follows:

TaON/Ag constructed by the invention₃VO₄The foam nickel photocatalysis film has wide light absorption range, excellent activity of degrading dye in water by photocatalysis, and effectively avoids TaON/Ag₃VO₄Powder loss, difficult recovery and the like, and does not need to separate TaON/Ag in the treated water₃VO₄And (3) powder. The invention has simple preparation method, low cost and TaON/Ag₃VO₄The foamed nickel photocatalytic film can be repeatedly used and has good industrial application prospect.

The accompanying drawings, which are included to provide a further understanding of the invention and are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and together with the description serve to explain the principles of the invention and not to limit the invention.

Drawings

FIG. 1 shows TaON/foam nickel, Ag₃VO₄Foamed nickel, TaON/Ag₃VO₄Wide angle X-ray diffraction pattern of nickel foam;

FIG. 2 shows TaON/foam nickel, Ag₃VO₄Foamed nickel, TaON/Ag₃VO₄A narrow angle X-ray diffraction pattern of nickel foam;

FIG. 3 shows TaON/foam Ni, Ag₃VO₄Foamed nickel, TaON/Ag₃VO₄A morphology of foamed nickel;

FIG. 4 shows TaON/foam Ni, Ag₃VO₄Foamed nickel, TaON/Ag₃VO₄The activity curve of photocatalytic degradation fuchsin of the foamed nickel film;

FIG. 5 shows TaON/Ag₃VO₄Foamed nickel, TaON/Ag₃VO₄Powder of Fe₂O₃/Ag₃VO₄Foamed nickel and MoS₂The activity curve of/TaON/foamed nickel photocatalytic decomposition fuchsin;

FIG. 6 shows TaON/foam Ni/Ag₃VO₄Foamed nickel, TaON/Ag₃VO₄Stability curve of photocatalytic degradation of fuchsin by foamed nickel thin film.

Detailed Description