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
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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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