Control synthetic method of high-visible-light-activity mixed crystal type BiVO4 photocatalysts

A technology of photocatalyst and synthesis method, which is applied in the direction of catalyst activation/preparation, chemical instruments and methods, physical/chemical process catalysts, etc. It can solve the problems of no synthesis report, single monoclinic scheelite structure, etc., and achieve good results. Catalytic effect, controllable crystal structure, and low cost

Inactive Publication Date: 2013-02-27
HUAIYIN TEACHERS COLLEGE
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

BiVO with high visible light activity reported so far 4 Photocatalysts usually have a single monoclinic scheelite structure, and there is no mixed crystal BiVO with high catalytic performance. 4 Synthesis report of photocatalyst

Method used

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  • Control synthetic method of high-visible-light-activity mixed crystal type BiVO4 photocatalysts
  • Control synthetic method of high-visible-light-activity mixed crystal type BiVO4 photocatalysts
  • Control synthetic method of high-visible-light-activity mixed crystal type BiVO4 photocatalysts

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0016] Embodiment 1: synthesize according to the following steps R BiVO = 0 4 That is, BiVO with pure tetragonal zirconium silicate structure 4 :

[0017] a) Weigh 0.9283g NH 3 VO 4 Dissolve in 10mL 2mol / L NaOH solution to make transparent solution A, weigh 3.8884g Bi(NO 3 ) 3 ?5H 2 O dissolved in 10mL 2mol / L HNO 3 A transparent solution B is made in the solution;

[0018] b) Gradually add the above transparent solution A to the transparent solution B dropwise under constant stirring to form a yellow suspension, continue stirring for 30 minutes after the addition is complete, and then adjust the pH of the system with 2mol / L NaOH solution to 2, continue to stir for 6h;

[0019] c) Transfer the above suspension to a stainless steel reaction kettle lined with white polytetrafluoroethylene, and put it in a thermostat at 120°C for hydrothermal treatment for 8 hours;

[0020] d) Extract the reaction product by filtration, wash the obtained yellow precipitate with deionize...

Embodiment 2

[0021] Embodiment 2: synthesize according to the following steps R =60.51% mixed crystal BiVO 4 :

[0022] a) Weigh 0.9283g NH 3 VO 4 Dissolve in 10mL 3mol / L NaOH solution to make transparent solution A, weigh 3.8884g Bi(NO 3 ) 3 ?5H 2 O dissolved in 10mL 3mol / L HNO 3 A transparent solution B is made in the solution;

[0023] b) Gradually add the above-mentioned transparent solution A into the transparent solution B dropwise under constant stirring to form a yellow suspension, continue stirring for 30 minutes after the addition is complete, and then adjust the pH of the system with 3mol / L NaOH solution to 4, continue to stir for 4h;

[0024] c) Transfer the above suspension to a stainless steel reaction kettle lined with white polytetrafluoroethylene, and put it in a thermostat at 140°C for hydrothermal treatment for 5 hours;

[0025] d) Extract the reaction product by filtration, wash the obtained yellow precipitate with deionized water and absolute ethanol for 2 to...

Embodiment 3

[0026] Embodiment 3: synthesize according to the following steps R =92.73% mixed crystal BiVO 4 :

[0027] a) Weigh 0.9283g NH 3 VO 4 Dissolve in 10mL 4mol / L NaOH solution to make transparent solution A, weigh 3.8884g Bi(NO 3 ) 3 ?5H 2 O dissolved in 10mL 4mol / L HNO 3 A transparent solution B is made in the solution;

[0028] b) Gradually add the above-mentioned transparent solution A to the transparent solution B dropwise under constant stirring to form a yellow suspension, continue stirring for 30 minutes after the addition is complete, and then use 4mol / L NaOH solution to adjust the pH of the system to 7, continue to stir for 2h;

[0029] c) Transfer the above suspension to a stainless steel reaction kettle lined with white polytetrafluoroethylene, and put it in a thermostat at 160°C for hydrothermal treatment for 4 hours;

[0030] d) Extract the reaction product by filtration, wash the obtained yellow precipitate with deionized water and absolute ethanol for 2 to 3...

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Abstract

The invention discloses a control synthetic method of high-visible-light-activity mixed crystal type BiVO4 photocatalysts, which comprises the steps that: firstly, a certain amount of NH3VO4 and Bi(NO3)3.5H2O are taken according to the stoichiometric ratio and are respectively dissolved in NaOH solution and HNO3 solution to obtain clear solutions A and B; then, the solution A is gradually dripped into the solution B to generate yellow turbid liquid, next, the NaOH solution is used for regulating the pH value to 2 to 9, the mixed solution is transferred into a stainless steel reaction kettle using white polyfluortetraethylene as an inner lining after being stirred for 2 to 6h, and the reaction is carried out for 2 to 8h under the temperature condition of 120 to 180 DEG C; and after the complete reaction, deionized water and absolute ethyl alcohol are used for cleaning samples until filter liquid is neutral, and the drying is carried out for 4 to 8h under the condition of 60 to 100 DEG C. The control synthetic method has the advantages that the preparation process is simple, the cost is low, the crystal type proportion is controllable, the dispersibility of the mixed crystal type BiVO4 is good, the specific surface area is large, and the visible light activity is high.

Description

technical field [0001] The invention relates to a preparation method of a photocatalyst, in particular to a method for synthesizing a mixed-crystal BiVO with high visible photocatalytic activity controlled by hydrothermal technology. 4 The catalyst method belongs to the field of photocatalyst materials. Background technique [0002] The constraints of resources and the environment on the development of human society are becoming more and more obvious. Solving the problems of resources and the environment is an urgent need for human beings to achieve sustainable development. Photocatalytic technology is a catalytic reaction technology in which photocatalyst absorbs solar energy and converts it into the energy required for chemical reactions, promotes chemical reactions, and does not change itself. It is mainly used in photolysis of water to produce hydrogen and photocatalytic degradation of organic matter. It has the characteristics of low energy consumption, easy operation,...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J23/22B01J37/10B01J20/06
Inventor 张莉莉龙金鑫张维光周守勇赵宜江汪信
Owner HUAIYIN TEACHERS COLLEGE
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