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Bismuth metal loaded tungsten nitride photocatalyst as well as preparation method and application thereof

A technology of photocatalyst and bismuth metal, which is applied in the field of photocatalytic materials, can solve problems such as insufficiency, and achieve the effects of promoting utilization, good hydrogen evolution cycle stability, and improving photocatalytic efficiency

Active Publication Date: 2020-06-26
SHANGHAI UNIVERSITY OF ELECTRIC POWER
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] For a long time, photocatalysis is still not enough to solve the problems of expanding the range of solar spectrum that photocatalysts can use and improving photocatalytic efficiency.

Method used

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  • Bismuth metal loaded tungsten nitride photocatalyst as well as preparation method and application thereof
  • Bismuth metal loaded tungsten nitride photocatalyst as well as preparation method and application thereof
  • Bismuth metal loaded tungsten nitride photocatalyst as well as preparation method and application thereof

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0080] A bismuth metal-supported tungsten nitride photocatalyst mainly contains three main elements of Bi, W and N, and is prepared by a method comprising the following steps:

[0081] (1) Preparation of sheet-like WN (tungsten nitride nanosheets)

[0082] 288mg phosphotungstic acid (H 3 o 40 PW 12 .xH 2 O) In 50ml of deionized water, ultrasonically stirred for 10 minutes for 40 minutes; 15uL of pyridine was dissolved in 10ml of deionized water, and then slowly added to the above aqueous solution of phosphotungstic acid. Then the above solution was transferred to a 50°C oil bath and stirred for 24h, and finally centrifuged at 8000rpm, washed several times with deionized water and dried in an oven at 60°C to obtain a tungsten nitride precursor. The precursor was transferred to a tube furnace and calcined in an ammonia atmosphere at a calcination temperature of 600°C, a calcination time of 4 hours, and a heating rate of 3-5°C / min. Obtained flake WN.

[0083] (2), preparati...

Embodiment 2

[0101] A bismuth metal-supported tungsten nitride photocatalyst mainly contains three main elements of Bi, W and N, and is prepared by a method comprising the following steps:

[0102] (1) Preparation of sheet-like WN (tungsten nitride nanosheets)

[0103] 300mg phosphotungstic acid (H 3 o 40 PW 12 .xH 2 O) In 50ml of deionized water, ultrasonically stirred for 10 minutes for 40 minutes; 10uL of pyridine was dissolved in 10ml of deionized water, and then slowly added to the above aqueous solution of phosphotungstic acid. Then the above solution was transferred to a 60°C oil bath and stirred for 12h, and finally centrifuged at 7000rpm, washed several times with deionized water and dried in an oven at 70°C to obtain a tungsten nitride precursor. The precursor was transferred to a tube furnace and calcined in an ammonia atmosphere at a calcination temperature of 650°C, a calcination time of 2 hours, and a heating rate of 3-5°C / min. Obtained flake WN.

[0104] (2), preparati...

Embodiment 3

[0109] A bismuth metal-supported tungsten nitride photocatalyst mainly contains three main elements of Bi, W and N, and is prepared by a method comprising the following steps:

[0110] (1) Preparation of sheet-like WN (tungsten nitride nanosheets)

[0111] 250mg phosphotungstic acid (H 3 o 40 PW 12 .xH 2 O) In 50ml of deionized water, ultrasonically stirred for 10 minutes for 40 minutes; 20uL of pyridine was dissolved in 10ml of deionized water, and then slowly added to the above aqueous solution of phosphotungstic acid. Then the above solution was transferred to a 40°C oil bath and stirred for 48h, and finally centrifuged at 7500rpm, washed several times with deionized water and dried in an oven at 65°C to obtain a tungsten nitride precursor. The precursor was transferred to a tube furnace and calcined in an ammonia atmosphere at a calcination temperature of 550°C, a calcination time of 6 hours, and a heating rate of 3-5°C / min. Obtained flake WN.

[0112] (2), preparati...

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Abstract

The invention relates to a bismuth metal loaded tungsten nitride photocatalyst as well as a preparation method and application thereof. The preparation method comprises the following steps: (1) addinga pyridine aqueous solution into a phosphotungstic acid aqueous solution, heating, stirring, centrifuging, drying, and calcining in ammonia gas to obtain tungsten nitride nanosheets; (2) adding bismuth nitrate into a NaOH solution, carrying out hydrothermal treatment, carrying out centrifugal drying, collecting powder, and calcining in air to obtain a flower-like BiO precursor; and (3) dissolvingthe tungsten nitride nanosheet and the flower-like BiO precursor in water, carrying out hydrothermal reaction, centrifuging, collecting powder, and calcining in ammonia gas to obtain the bismuth metal loaded tungsten nitride photocatalyst. Compared with the prior art, the photocatalyst provided by the invention has the characteristics of wide light absorption range, high water decomposition hydrogen production performance, low resistivity, quick carrier transfer capability, high photon-generated carrier separation capability, low carrier recombination rate, good hydrogen evolution cycling stability and the like, and the preparation method has the characteristics of simple operation, low cost, environmental protection and the like.

Description

technical field [0001] The invention relates to a photocatalytic material, in particular to a bismuth metal-loaded tungsten nitride photocatalyst, a preparation method and application thereof. Background technique [0002] Clean and renewable energy is considered to be the key factor to solve the energy crisis, among which photocatalysis and photothermal effect rely on the way of solar light conversion to become one of the solutions to reduce the pressure of environmental protection. Therefore, the sustainable splitting of water to generate hydrogen by harnessing solar energy has drawn much attention to the conversion of solar energy into chemical energy. At present, the main factor restricting the conversion efficiency of solar energy to hydrogen energy conversion is the lack of suitable photocatalysts that can absorb light of a wide wavelength and efficiently separate and rapidly transfer photogenerated electron-hole pairs. The light absorptivity is mainly represented by ...

Claims

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Application Information

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IPC IPC(8): B01J27/24B01J35/00B01J35/02B01J37/10C01B3/04
CPCB01J27/24B01J37/10C01B3/042C01B2203/1088B01J35/39B01J35/33B01J35/00B01J35/30Y02P20/133
Inventor 闵宇霖何昊魏泺骥时鹏辉范金辰徐群杰朱晟
Owner SHANGHAI UNIVERSITY OF ELECTRIC POWER
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