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Bismuth vanadate@silver phosphate/graphene oxide composite photocatalyst as well as preparation method and application thereof

A graphene composite and photocatalyst technology, applied in the field of photocatalytic materials, can solve the problems of high cost and high charge recombination efficiency

Active Publication Date: 2021-07-06
SHAANXI UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The preparation method of the present invention is simple, safe and environment-friendly. The bismuth vanadate@silver phosphate / graphene oxide composite photocatalyst prepared by the preparation method has high photocatalytic cycle stability and excellent catalytic activity, which solves the problem of silver phosphate composite photocatalyst. The problem of high efficiency and high cost of catalysts in charge recombination

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  • Bismuth vanadate@silver phosphate/graphene oxide composite photocatalyst as well as preparation method and application thereof
  • Bismuth vanadate@silver phosphate/graphene oxide composite photocatalyst as well as preparation method and application thereof
  • Bismuth vanadate@silver phosphate/graphene oxide composite photocatalyst as well as preparation method and application thereof

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preparation example Construction

[0037] A preparation method of bismuth vanadate@silver phosphate / graphene oxide composite photocatalyst, the steps are as follows:

[0038] (1) bismuth vanadate (BiVO 4 ) with 10-20mL AgNO 3 Mix well in the water-ethanol mixed solvent (the volume ratio of ethanol to water is 1:5~10), and add 2.5mL H 3 PO 4 Mix the solution with 10-20mL ethanol, stir for 1-3 hours, collect the precipitate after aging for 1-3 hours; vacuum dry at 80°C for 12 hours to obtain bismuth vanadate@silver phosphate with a heterojunction structure;

[0039] (2) Graphene oxide (GO) was prepared by the improved Hummers method, and the prepared GO was dispersed in deionized water, and ultrasonically treated for 3 hours to obtain a GO suspension. Bismuth vanadate@silver phosphate and graphene oxide suspension were uniformly dispersed to obtain a reactant system, which was centrifuged, washed with deionized water and ethanol for 3 times, and freeze-dried for 12 hours to obtain bismuth vanadate@silver phosp...

Embodiment 1

[0049] 17g Bi(NO 3 ) 3 ·5H 2 O and 2NH 4 VO 3 respectively dissolved in 100mL, 1.5mol / L HNO 3 in solution. Under stirring conditions, the NH 4 VO 3 solution added Bi(NO 3 ) 3 ·5H 2 O solution, stirred for 60 min. The pH value of the mixed solution was adjusted to 1.5 with ammonia water, resulting in an orange precipitate. After aging for 2 hours, the orange precipitate was transferred to a hydrothermal reactor and reacted at 200°C for 24 hours. After the autoclave was naturally cooled to room temperature, the precipitate was collected, washed three times with deionized water, and dried under vacuum at 80°C for 12 hours to obtain BiVO 4 ; the BiVO 4 with 10mL AgNO 3 Mix evenly in a water-ethanol mixed solvent (volume ratio of ethanol to water is 1:8) (AgNO 3 with BiVO 4 The mass ratio is 0.5:1), add 2.5mL H to the above solution under stirring condition 3 PO 4 Mix the solution with 10mL ethanol, stir for 1h, collect the precipitate after aging for 2h; dry the ...

Embodiment 2

[0053] 15g Bi(NO 3 ) 3 ·5H 2 O and 3g NH 4 VO 3 respectively dissolved in 100mL, 1.5mol / L HNO 3 in solution. Under stirring conditions, the NH4 VO 3 solution added Bi(NO 3 ) 3 ·5H 2 O solution, stirred for 60 min. The pH of the mixed solution was adjusted to 2 with ammonia water, resulting in an orange precipitate. After aging for 1.5 h, the orange precipitate was transferred to a hydrothermal reaction kettle and reacted at 200°C for 24 h. After the autoclave was naturally cooled to room temperature, the precipitate was collected, washed three times with deionized water, and dried under vacuum at 80°C for 12 hours to obtain BiVO 4 ; the BiVO 4 with 10mL AgNO 3 Mix evenly in a water-ethanol mixed solvent (volume ratio of ethanol to water is 1:8) (AgNO 3 with BiVO 4 The mass ratio is 0.8:1), add 2.5mL H to the above solution under stirring condition 3 PO 4 Mix the solution with 10mL ethanol, stir for 1h, collect the precipitate after aging for 2h; dry the obtain...

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Abstract

The invention discloses a bismuth vanadate@silver phosphate / graphene oxide composite photocatalyst as well as a preparation method and application thereof, and belongs to the technical field of photocatalytic materials. The preparation method comprises the following steps of: growing needle-like silver phosphate on the surface of bismuth vanadate by adopting an in-situ precipitation method to obtain bismuth vanadate@silver phosphate with a heterojunction structure; and coating the bismuth vanadate@silver phosphate with a heterojunction structure by using graphene oxide to obtain the bismuth vanadate@silver phosphate / graphene oxide composite photocatalyst. In the prepared bismuth vanadate@silver phosphate / graphene oxide composite photocatalyst, needle-like silver phosphate grows on the surface of bismuth vanadate in situ to form a heterojunction structure, and the surface of the bismuth vanadate is coated with graphene oxide nanosheets. The bismuth vanadate@silver phosphate / graphene oxide composite photocatalyst can be applied to treatment of water containing organic pollutants, the organic pollutants are subjected to photocatalytic degradation under visible light irradiation, and good stability and excellent photocatalytic activity are kept.

Description

technical field [0001] The invention belongs to the technical field of photocatalytic materials, and relates to a bismuth vanadate@silver phosphate / graphene oxide composite photocatalyst and its preparation method and application. Background technique [0002] The development of industrialization has produced a large amount of wastewater containing various organic dyes, which has caused toxic effects on the aquatic ecosystem. Therefore, organic dye pollution has become a serious environmental problem. At present, various methods such as adsorption, electrolysis, photocatalysis, microbial decomposition and membrane separation have been used to remove organic dyes in water. Among them, photocatalytic technology, which uses semiconductor materials as catalysts and uses green solar energy as energy to eliminate pollutants, is considered to be a promising and sustainable method to solve environmental pollution. [0003] Silver phosphate (Ag 3 PO 4 ) is a visible light photoca...

Claims

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Application Information

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IPC IPC(8): B01J27/198B01J35/10C02F1/30C02F101/38
CPCB01J27/198C02F1/30C02F2305/10C02F2101/38B01J35/39B01J35/61Y02W10/37
Inventor 张文博李思纯李莉马建中鲍艳刘超祝茜
Owner SHAANXI UNIV OF SCI & TECH
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