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Preparation method of all-solid-state Z-shaped heterojunction photocatalyst

A photocatalyst and heterojunction technology, applied in the direction of catalyst activation/preparation, chemical instruments and methods, physical/chemical process catalysts, etc., can solve the problems of easy recombination, limit further application, low quantum efficiency, etc., and achieve easy recombination , solve the mass transfer problem, and have high photocatalytic activity

Active Publication Date: 2019-01-18
XI AN JIAOTONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Among many semiconductor materials, hydrogen tungsten bronze (H x WO 3 ) is favored by researchers for its stable performance, non-toxic and harmless, cheap raw materials, and strong light absorption ability in both visible light and near-infrared light. However, hydrogen tungsten bronze photocatalysts still have few a technical problem, which limits its further application in industry
Such as low quantum efficiency, easy recombination of photogenerated carriers, and no ability to photolyze water to produce hydrogen

Method used

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  • Preparation method of all-solid-state Z-shaped heterojunction photocatalyst

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Embodiment 1

[0042] The preparation method of the all-solid-state Z-type heterojunction photocatalyst of the present invention comprises the following steps:

[0043] 1) Add tungstic acid and ammonia water to deionized water A, stir evenly, add oxalic acid and absolute ethanol, then add PS template, then vacuum impregnate, dry and calcinate to obtain 3DOM-WO 3 Catalyst to 3DOM-WO 3 Add deionized water B to the catalyst, then add chloroplatinic acid solution, and stir and irradiate under a xenon lamp by photoreduction method to obtain 3DOM-WO 3 / Pt catalyst, and finally 3DOM-WO 3 / Pt catalyst in H 2 Heat treatment under the atmosphere to get 3DOM-H x WO 3 / Pt;

[0044] 2) Weigh L-cysteine, Cd(NO 3 ) 2 and 3DOM-H x WO 3 / Pt, then L-cysteine, Cd(NO 3 ) 2 and 3DOM-H x WO 3 / Pt is added to water, and then stirred evenly to obtain a mixed solution;

[0045] 3) Add Na to the mixed solution obtained in step 2) 2 S solution, followed by hydrothermal reaction, cooled to room temperatu...

Embodiment 2

[0056] The preparation method of the all-solid-state Z-type heterojunction photocatalyst of the present invention comprises the following steps:

[0057] 1) Add tungstic acid and ammonia water to deionized water A, stir evenly, add oxalic acid and absolute ethanol, then add PS template, then vacuum impregnate, dry and calcinate to obtain 3DOM-WO 3 Catalyst to 3DOM-WO 3 Add deionized water B to the catalyst, then add chloroplatinic acid solution, and stir and irradiate under a xenon lamp by photoreduction method to obtain 3DOM-WO 3 / Pt catalyst, and finally 3DOM-WO 3 / Pt catalyst in H 2 Heat treatment under the atmosphere to get 3DOM-H x WO 3 / Pt;

[0058] 2) Weigh L-cysteine, Cd(NO 3 ) 2 and 3DOM-H x WO 3 / Pt, then L-cysteine, Cd(NO 3 ) 2 and 3DOM-H x WO 3 / Pt is added to water, and then stirred evenly to obtain a mixed solution;

[0059] 3) Add Na to the mixed solution obtained in step 2) 2 S solution, followed by hydrothermal reaction, cooled to room temperatu...

Embodiment 3

[0070] The preparation method of the all-solid-state Z-type heterojunction photocatalyst of the present invention comprises the following steps:

[0071] 1) Add tungstic acid and ammonia water to deionized water A, stir evenly, add oxalic acid and absolute ethanol, then add PS template, then vacuum impregnate, dry and calcinate to obtain 3DOM-WO 3 Catalyst to 3DOM-WO 3 Add deionized water B to the catalyst, then add chloroplatinic acid solution, and stir and irradiate under a xenon lamp by photoreduction method to obtain 3DOM-WO 3 / Pt catalyst, and finally 3DOM-WO 3 / Pt catalyst in H 2 Heat treatment under the atmosphere to get 3DOM-H x WO 3 / Pt;

[0072] 2) Weigh L-cysteine, Cd(NO 3 ) 2 and 3DOM-H x WO 3 / Pt, then L-cysteine, Cd(NO 3 ) 2 and 3DOM-H x WO 3 / Pt is added to water, and then stirred evenly to obtain a mixed solution;

[0073] 3) Add Na to the mixed solution obtained in step 2) 2 S solution, followed by hydrothermal reaction, cooled to room temperatu...

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Abstract

The invention discloses a preparation method of an all-solid-state Z-shaped heterojunction photocatalyst. The preparation method comprises the following steps: 1) adding tungstic acid and ammonia water into deionized water A, after uniformly stirring, adding oxalic acid and anhydrous ethanol, then adding a PS template, then carrying out vacuum impregnation, drying and calcination to obtain a 3DOM-WO3 catalyst, then adding deionized water B, then adding a chloroplatinic acid solution, stirring under irradiation of an xenon lamp by a photo-reduction method to obtain a 3DOM-WO3 / Pt catalyst, finally carrying out heat treatment to obtain 3DOM-HxWO3 / Pt; 2) adding L-cysteine, Cd(NO3)2 and 3DOM-HxWO3 / Pt into water, then uniformly stirring to obtain a mixed solution; and 3) adding a Na2S solution into the mixed solution, then carrying out hydrothermal reaction, after reaction is ended, cooling to room temperature, then carrying out washing, centrifugal separation, freezing and drying to obtainthe Z-shaped heterojunction photocatalyst. The all-solid-state Z-shaped heterojunction photocatalyst prepared by the invention has the characteristics of high quantum efficiency and difficult composition of photon-generated carriers, and the photocatalytic activity is higher.

Description

technical field [0001] The invention belongs to the technical field of energy catalysis, and relates to a preparation method of an all-solid-state Z-type heterojunction photocatalyst. Background technique [0002] Hydrogen is a renewable, pollution-free, clean energy with high energy density. It has played an important role in metallurgy, fuel cell, organic synthesis, petrochemical and other industries. At present, hydrogen is mainly produced through water gas conversion, water electrolysis, and hydrocarbon cracking, but these processes have more or less problems such as excessive resource consumption, environmental pollution, and production safety. Therefore, the development of new, economical and efficient hydrogen production technologies is of great significance to the sustainable development of human society. Solar photocatalytic hydrolysis hydrogen production technology is a newly developed hydrogen production technology in recent years. Its principle is that photocat...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J27/04B01J37/08B01J37/10B01J37/18C01B3/04
CPCC01B3/042B01J27/04B01J37/0018B01J37/10B01J37/18B01J35/399B01J35/23B01J35/39Y02E60/36
Inventor 杨贵东严孝清夏梦阳
Owner XI AN JIAOTONG UNIV
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