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Preparation method of quadrangular bismuth vanadate/graphene composite photocatalyst

A graphene composite and photocatalyst technology, which is applied in the synthesis of composite photocatalytic materials, can solve the problems of easy aggregation of nanoparticles, restrictions on the industrial application of nanophotocatalytic technology, narrow absorption spectrum range, etc., and achieve good crystal form and light absorption performance Effect

Inactive Publication Date: 2017-05-10
HENAN NORMAL UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The single-phase semiconductor nanophotocatalyst powder suspension system that has been widely studied at present has defects such as easy aggregation and deactivation of nanoparticles, low utilization efficiency and narrow absorption spectrum range, which seriously limit the industrial application of nanophotocatalytic technology.

Method used

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  • Preparation method of quadrangular bismuth vanadate/graphene composite photocatalyst

Examples

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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 stirring for 30min, and adjust the pH of the mixed solution to 3 with NaOH solution with a molar concentration of 2mol / L. Continue to stir for 30 minutes, then transfer the mixture 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, then dry, and finally calcined at 500°C After 4h, a tetragonal monoclinic bismuth vanadate catalyst with visible light was prepared, marked as BIV. After 3h 500W Xe lamp visible light irradiation, the tetragonal monoclinic bismuth vanadate photocatalyst has a decolorization rate of 73.2% for RhB.

Embodiment 2

[0012] Disperse 0.0162g of graphene oxide in 15mL of HNO with a molar concentration of 1mol / L 3 solution, ultrasonic 2h, then magnetic stirring, and then 2.425g Bi(NO 3 ) 3 ·5H 2 O was added to the above solution, magnetically stirred until completely dissolved to obtain solution A; 0.585g 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 mixed solution to 3 with NaOH solution with a molar concentration of 2mol / L. Continue to stir for 30 minutes, then transfer the mixture 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, then dry, and finally calcined at 500°C After 4h, the tetragonal bismuth vanadate / graphene composite photocatalyst was prepared, labeled as BIG-1%. After 3h 5...

Embodiment 3

[0014] Disperse 0.0486g of graphene oxide in 15mL of HNO with a molar concentration of 1mol / L 3 solution, ultrasonic 2h, then magnetic stirring, and then 2.425g Bi(NO 3 ) 3 ·5H 2 O was added to the above solution, magnetically stirred until completely dissolved to obtain solution A; 0.585g 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 mixed solution to 3 with NaOH solution with a molar concentration of 2mol / L. Continue to stir for 30 minutes, then transfer the mixture 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, then dry, and finally calcined at 500°C After 4h, the tetragonal bismuth vanadate / graphene composite photocatalyst was prepared, labeled as BIG-3%. After 3h 5...

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Abstract

The invention discloses a preparation method of a quadrangular bismuth vanadate / graphene composite photocatalyst. The preparation method comprises the specific steps that oxidized graphene is dispersed in an HNO3 solution, then Bi(NO3)3.5H2O is added to the solution, magnetic stirring is performed till complete dissolution is achieved, and a solution A is obtained; NH4VO3 is dissolved in water under ultrasonic condition to prepared a solution B; the solution B is added to the solution A, stirring continues for 30 minutes, pH of the mixed solution is regulated with a NaOH solution to reach 3, stirring continues for 30 minutes, then the mixed solution is transferred to a polytetrafluoroethylene reaction kettle, reaction is performed at the temperature of 180 DEG C for 18 hours, natural cooling is performed to reach room temperature after reaction is completed, filtration and separation are performed, three times of washing are performed with water and ethyl alcohol, drying is performed, and finally calcination is performed at the temperature of 500 DEG C for 4 hours to obtain the quadrangular bismuth vanadate / graphene composite photocatalyst. The prepared quadrangular bismuth vanadate / graphene composite photocatalyst has good crystal form and light absorption properties, also has the photocatalytic performance of visible light response and has the performance of efficiently degrading a rhodamine B dye wastewater in visible light.

Description

technical field [0001] The invention belongs to the technical field of synthesis of composite photocatalytic materials, and in particular relates to a preparation method of a tetragonal bismuth vanate / graphene composite photocatalyst. Background technique [0002] Dye wastewater is one of the typical refractory organic wastewater. It has the characteristics of high alkalinity, dark color, strong odor and refractory biodegradation. It seriously pollutes water bodies, and the effect of conventional treatment methods is not ideal. In recent years, the photocatalytic oxidation technology of semiconductor materials has attracted increasing attention, and semiconductor photocatalysts that can be excited under visible light are more popular. Among them, monoclinic BiVO 4 It is a new type of visible light semiconductor photocatalyst developed in recent years, with a band gap of 2.4eV. The single-phase semiconductor nanophotocatalyst powder suspension system that has been widely st...

Claims

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Application Information

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IPC IPC(8): B01J23/22C02F1/30C02F1/72C02F101/34C02F101/36C02F101/38
CPCC02F1/30C02F1/725B01J23/22C02F2101/308C02F2101/38C02F2101/36C02F2101/34C02F2305/10B01J35/39
Inventor 孙剑辉禹崇菲董淑英王倩文谭露丁艳艳郭腾张迪
Owner HENAN NORMAL UNIV
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