CsPMo/g-C3N4-Bi2O3 photocatalyst and preparation method therefor and application thereof in phenolic wastewater treatment

A photocatalyst, g-c3n4 technology, applied in the direction of physical/chemical process catalysts, chemical instruments and methods, light water/sewage treatment, etc., can solve the problem of low utilization efficiency of visible light, to facilitate oxidation, reduce treatment costs, The effect of improving the processing effect

Inactive Publication Date: 2015-11-11
ZHEJIANG GONGSHANG UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] However, the current photocatalytic oxidants generally have the defect of low utilization efficiency of visible light.

Method used

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  • CsPMo/g-C3N4-Bi2O3 photocatalyst and preparation method therefor and application thereof in phenolic wastewater treatment
  • CsPMo/g-C3N4-Bi2O3 photocatalyst and preparation method therefor and application thereof in phenolic wastewater treatment
  • CsPMo/g-C3N4-Bi2O3 photocatalyst and preparation method therefor and application thereof in phenolic wastewater treatment

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0056] Embodiment 1 catalyst preparation method

[0057] (1) CsPMo(1:3) / g-C 3 N 4 -Bi 2 o 3 The preparation of photocatalyst, the steps are as follows:

[0058] (1) Add 100mg of g-C 3 N 4 Dissolve in 60mL of water, stir for 10min, ultrasonically disperse for 40min, centrifuge at 4000r / min, take 50mL of the upper emulsion, add 1g of Bi 2 o 3 .

[0059] (2) Ultrasonic disperse again for 40 minutes, add 100 mg of phosphomolybdic acid, stir for 10 minutes, wait until it is completely dissolved, add 0.0536 g of cesium carbonate, and react for 60 minutes.

[0060] (3) Rotate the yellow precipitate to dryness and grind it to get CsPMo / g-C 3 N 4 -Bi 2 o 3 .

[0061] Where: g-C 3 N 4 with Bi 2 o 3 The mass ratio is about 1:10, and the molar ratio of phosphomolybdic acid to cesium carbonate is 1:3.

[0062] (2) CsPMo(1:3) / Bi 2 o 3 The preparation of photocatalyst, the steps are as follows:

[0063] (1) Add 1g of Bi to 50mL of water 2 o 3 , stirred for 40min.

[0...

Embodiment 2

[0074] Take 0.1g of prepared catalyst Bi 2 o 3 and CsPMo / Bi 2 o 3 , CsPMo / g-C 3 N 4 -Bi 2 o 3 , Dissolve CsPMo in 0.5mL ethylene glycol, ultrasonically disperse for 30min, drop-coat on conductive glass (FTO) (6cm*1cm), drop-coat size is 1cm*1cm, apply twice, 20μL each time, vacuum dry at 80°C , making Bi2 O 3 , CsPMo / Bi 2 O 3 , CsPMo / g-C 3 N 4 -Bi 2 O 3 electrode.

[0075] The CsPMo / g-C 3 N 4 -Bi 2 O 3 Electrodes are placed in Na 2 SO 4 (0.1mol / L), Na 2 SO 3 (0.1mol / L) mixed solution, under the electrochemical workstation 3-electrode system, with CsPMo / g-C 3 N 4 -Bi 2 O 3 The electrode is the working electrode, the platinum sheet is the counter electrode, the silver electrode is the reference electrode, and the xenon lamp is the light source.

[0076] figure 1 , figure 2 The photocurrent density maps of the three electrodes under UV-visible light and visible light, respectively.

[0077] from figure 1 It can be seen that CsPMo / Bi 2 O 3 , CsPMo / ...

Embodiment 3

[0080] Add phenol-containing wastewater with a volume of 50 mL and a concentration of 10 mg / L to the reactor, and add 50 mg of CsPMo (1:3) / g-C 3 N 4 -Bi 2 O 3 Visible light catalyst, no need to adjust pH, continuous stirring, stirring in a dark place for 30 min until the adsorption equilibrium, turning on the visible light source, and reacting for 5 hours.

[0081] Change the photocatalyst to the photocatalyst Bi prepared in Example 1 2 O 3 , CsPMo(1:3), CsPMo(1:3) / Bi 2 O 3 , CsPMo(1:3) / g-C 3 N 4 -Bi 2 O 3 Comparing the effect of phenol oxidation, the results are as follows image 3 .

[0082] like image 3 , under the same conditions, the modified CsPMo(1:3) / g-C 3 N 4 -Bi 2 O 3 Ratio CsPMo(1:3) / Bi 2 O 3 , CsPMo(1:3), Bi 2 O 3 The effects of phenol oxidation were improved to varying degrees. After 5 hours, CsPMo(1:3) / g-C 3 N 4 -Bi 2 O 3 The oxidation rate of p-phenol reaches 97%, which is about Bi 2 O 3 2 times.

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Abstract

The invention discloses a CsPMo/g-C3N4-Bi2O3 photocatalyst and a preparation method therefor and application thereof in phenolic wastewater treatment. The preparation method for the CsPMo/g-C3N4-Bi2O3 photocatalyst comprises the steps: (1) thoroughly dispersing g-C3N4 into water, then, sequentially adding Bi2O3, phosphomolybdic acid and cesium carbonate into the dispersion, carrying out uniformly mixing, and carrying out reaction to produce yellow precipitates; and (2) drying and grinding the obtained yellow precipitates, thereby obtaining the CsPMo/g-C3N4-Bi2O3 photocatalyst. The photocatalyst disclosed by the invention is applied to the photocatalytic treatment of phenolic wastewater and is added into the phenolic wastewater, stirring is carried out at a dark place until adsorption equilibrium is achieved, and reaction is carried out under visible light irradiation. The preparation method for the photocatalyst, disclosed by the invention, is simple, the degree of visible light response is increased, the photoproduction electron and hole separating effect is good, the effect of treating the phenolic wastewater is good, and no secondary pollution is caused.

Description

technical field [0001] The invention relates to the technical field of waste water treatment, especially the technical field of refractory organic waste water treatment, in particular to a CsPMo / g-C 3 N 4 -Bi 2 o 3 Photocatalyst, its preparation method and its application in treating phenol-containing wastewater. Background technique [0002] Phenol-containing wastewater is a kind of industrial wastewater with a wide range of pollution, a large amount, and great harm. It will seriously endanger the growth and reproduction of animals and plants, and even threaten human health. Long-term drinking of phenol-contaminated water can cause dizziness, skin itching, anemia and other symptoms, and can inhibit the central nervous system and damage the liver and kidney functions. [0003] The Chinese invention patent application with the publication number CN104261546A discloses a treatment method for phenol-containing wastewater, which includes the following steps: the phenol-conta...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J27/24C02F1/30
Inventor 王齐石晓东许剑佳刘妍秋周甜甜胡含蕾丛燕青张轶
Owner ZHEJIANG GONGSHANG UNIVERSITY
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