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Method for preparing monoclinic bismuth vanadate visible light catalyst

A technology of monoclinic crystal and visible light, applied in chemical instruments and methods, physical/chemical process catalysts, chemical/physical processes, etc., can solve problems such as inefficient use of sunlight, wide band gap, and difficulty in excitation. Achieve the effect of good crystal form and light absorption performance

Inactive Publication Date: 2017-04-26
HENAN NORMAL UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Common photocatalysts include TiO 2 and ZnO, however, their bandgap width is wide, and they can only be excited to generate hole-electron pairs under ultraviolet light, which is difficult to be excited under visible light, so they cannot efficiently use sunlight

Method used

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  • Method for preparing monoclinic bismuth vanadate visible light catalyst

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0010] 5mmol Bi(NO 3 ) 3 ·5H 2 O dissolved in 15 mL of HNO with a molar concentration of 1 mol / L 3 Solution A was prepared in the solution; 5mmol NH 4 VO 3 Solution B was prepared by dissolving in 40mL water under ultrasonic conditions; under stirring conditions, add solution B to solution A, continue to stir for 30min, then transfer the mixed solution into a polytetrafluoroethylene reactor, and react at 180°C After 18 hours, after the reaction was completed, it was naturally cooled to room temperature, separated by filtration, washed with water and ethanol three times respectively, then dried in a constant temperature drying oven at 60°C, and finally calcined at 500°C for 4 hours to obtain a visible photocatalyst of monoclinic bismuth vanadate, labeled for BiVO 4 -0. After 6 hours of natural sunlight irradiation, the decolorization rate of RhB by the bismuth vanadate visible photocatalyst was 86.5%.

Embodiment 2

[0012] 5mmol Bi(NO 3 ) 3 ·5H 2 O dissolved in 15 mL of HNO with a molar concentration of 1 mol / L 3 Solution A was prepared in the solution; 5mmol NH 4 VO 3 Solution B was prepared by dissolving in 40mL water under ultrasonic conditions; under stirring conditions, add solution B to solution A, continue stirring for 30min, and adjust the pH of the mixture to 1 with NaOH solution with a molar concentration of 2mol / L. Continue to stir for 30 minutes, then transfer the mixed solution into a polytetrafluoroethylene reactor, react at 180 ° C for 18 hours, naturally cool to room temperature after the reaction is completed, filter and separate, wash with water and ethanol three times, and then dry in a constant temperature oven at 60 ℃ drying, and finally calcined at 500 ℃ for 4h to obtain monoclinic bismuth vanadate visible light catalyst, marked as BiVO 4 -1. After 6 hours of natural sunlight irradiation, the decolorization rate of RhB by the bismuth vanadate visible photocatal...

Embodiment 3

[0014] 5mmol Bi(NO 3 ) 3 ·5H 2 O dissolved in 15 mL of HNO with a molar concentration of 1 mol / L 3 Solution A was prepared in the solution; 5mmol NH 4 VO 3 Solution B was prepared by dissolving in 40mL water under ultrasonic conditions; under stirring conditions, add solution B to solution A, continue stirring for 30 min, and adjust the pH of the mixture to 3 with NaOH solution with a molar concentration of 2mol / L , continue to stir for 30 minutes, then transfer the mixed solution into a polytetrafluoroethylene reactor, and react at 180°C for 18 hours. Dry at 60°C, and finally calcined at 500°C for 4 hours to obtain a monoclinic bismuth vanadate visible light catalyst, marked as BiVO 4 -3. After 6 hours of natural sunlight irradiation, the decolorization rate of RhB by the bismuth vanadate visible photocatalyst was 99.5%.

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Abstract

The invention discloses a method for preparing a monoclinic bismuth vanadate visible light catalyst, and the method comprises the following steps: (1) 5mmol of Bi (NO3) 3.5H2O is dissolved in 15mL of a HNO3 solution with the molar concentration of 1mol / L for preparing a solution A; (2) 5mmol of NH4VO3 is dissolved in 40mL of water to prepare a solution B under the ultrasound condition; (3) under the stirring condition, the solution B is added to the solution A for continuously stirring for 30min, and the pH value of the mixed solution is adjusted with a NaOH solution with the molar concentration of 2mol / L of to 1-5; and (4) the mixed solution is transferred into a polytetrafluoroethylene reactor for reaction for 18h at 180 DEG C, naturally cooled to room temperature after the completion of the reaction, filtered for separation, washed for respectively three times with water and ethanol, then dried in a constant temperature drying oven at 60 DEG C, and finally calcined at 500 DEG C for 4H to obtain the monoclinic bismuth vanadate visible light catalyst. The monoclinic bismuth vanadate visible light catalyst prepared by the method has a good crystal form and light absorption performances, has the visible light response photocatalytic performances, and has the efficient rhodamine B dye wastewater degradation performance.

Description

technical field [0001] The invention belongs to the technical field of synthesis of bismuth vanadate visible light catalytic materials, and in particular relates to a preparation method of a monoclinic bismuth vanadate visible light catalyst. Background technique [0002] Organic dye wastewater has the characteristics of high alkalinity, difficult biodegradation, strong odor, deep color and complex components, and its biological toxicity is relatively high. It can cause cancer, teratogenesis and mutagenesis, seriously pollute the environment, and it is difficult to treat. , the removal effect of conventional biological treatment is not ideal. Since the 1990s, countries have begun to gradually develop and pay attention to the environmental performance of semiconductor materials. The photocatalytic oxidation technology of semiconductor materials has attracted more and more attention, especially in the removal of refractory biodegradable pollutants. It has shown good applicatio...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J23/22C02F1/30C02F101/30C02F101/34C02F101/38
CPCC02F1/30B01J23/22C02F2101/308C02F2101/34C02F2101/38C02F2305/10B01J35/39Y02W10/37
Inventor 孙剑辉禹崇菲董淑英王竞侦骆圣达赵瑾王珂杨鹏艳
Owner HENAN NORMAL UNIV
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