Mesoporous WO[3-x] visible-light-driven photocatalyst with oxygen vacancy as well as preparation method and application thereof

An oxygen vacancy and visible light technology, applied in the nanometer field, can solve the problems of low efficiency, low specific surface area, and low concentration of oxygen vacancies, and achieve the effect of simple production equipment, large specific surface area, and uniform pore size distribution

Inactive Publication Date: 2015-09-02
SHANGHAI INST OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] One of the purposes of the present invention is to solve the problem that the above-mentioned tungsten trioxide as a photocatalyst has a low specific surface area and a low concentration of oxygen vacancies. CO 2 catalytic reduction to generate CH4 is not efficient and other technical issues

Method used

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  • Mesoporous WO[3-x] visible-light-driven photocatalyst with oxygen vacancy as well as preparation method and application thereof
  • Mesoporous WO[3-x] visible-light-driven photocatalyst with oxygen vacancy as well as preparation method and application thereof
  • Mesoporous WO[3-x] visible-light-driven photocatalyst with oxygen vacancy as well as preparation method and application thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0038] A mesoporous WO with oxygen vacancies 3-x The visible light catalyst is prepared by a method comprising the following steps:

[0039] (1) Disperse 0.35g of silicotungstic acid hydrate in 60ml of absolute ethanol, mix evenly for 30min under the assistance of ultrasound, stir at 800rpm for 1h, slowly add 0.2g of mesoporous silica synthesized by hydrothermal method Molecular sieve KIT-6-35, under sealed conditions, control the speed at 1000rpm and stir for 3 hours, then evaporate absolute ethanol to dryness in a 50°C water bath to obtain a white powder;

[0040] Disperse 0.25g of silicotungstic acid hydrate in 60ml of absolute ethanol, mix uniformly with the aid of ultrasound for 30min, stir at 800rpm for 1h, then add the white powder obtained above into it, stir evenly, put the free Water and ethanol were evaporated to dryness to obtain the mesoporous silica molecular sieve KIT-6-35 loaded with tungsten trioxide precursor;

[0041] The mass ratio of mesoporous ...

Embodiment 2

[0048] A mesoporous WO with oxygen vacancies 3-x The visible light catalyst is prepared by a method comprising the following steps:

[0049] (1) Disperse 0.4g of silicotungstic acid hydrate in 60 ml of absolute ethanol, mix evenly for 30min under the assistance of ultrasound, stir at 800rpm for 2h, slowly add 0.2g of mesoporous material synthesized by hydrothermal method Silica molecular sieve KIT-6-100, under sealed conditions, control the rotation speed at 1000rpm and stir for 3 hours, then evaporate absolute ethanol to dryness in a 60°C water bath to obtain a white powder;

[0050] Disperse 0.3g of silicotungstic acid hydrate in 60ml of absolute ethanol, mix uniformly for 30min with the aid of ultrasound, stir at 900rpm for 2h, then add the white powder obtained above into it, stir evenly, put it in a 60℃ water bath Anhydrous ethanol was evaporated to dryness to obtain the mesoporous silica molecular sieve KIT-6-100 loaded with tungsten trioxide precursor;

[0051] The ma...

Embodiment 3

[0058] A mesoporous WO with oxygen vacancies 3-x The visible light catalyst is prepared by a method comprising the following steps:

[0059] (1) Disperse 0.4g of bulk silicotungstic acid hydrate in 60ml of absolute ethanol, mix evenly for 30min under the assistance of ultrasound, stir at 800rpm for 3h, put the product in a corundum crucible and slowly add 0.2g of hydrothermal The mesoporous silica molecular sieve KIT-6-120 synthesized by the above method was stirred at a controlled speed of 1000rpm under sealed conditions for 5 hours, and then evaporated to dryness in an 80°C water bath to obtain a white powder;

[0060] Disperse 0.4g of silicotungstic acid hydrate in 60 ml of absolute ethanol, mix uniformly for 30min with the assistance of ultrasound, stir at 1000rpm for 3h, then add the white powder obtained above into it, stir well, and place in an 80°C water bath Evaporate absolute ethanol to dryness to obtain the mesoporous silica molecular sieve KIT-6-120 loaded with tu...

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Abstract

The invention discloses a mesoporous WO[3-x] visible-light-driven photocatalyst with oxygen vacancy and a preparation method thereof. The method comprises the following steps: calcinating at a controlled temperature of 350-600 DEG C in air so as to obtain a mesoporous silica molecular sieve KIT-6 loaded with tungsten trioxide by taking mesoporous silica molecular sieve KIT-6 as a hard template and a silicotungstic acid or phosphotungstic acid hydrate as a tungsten trioxide precursor; then calcinating at a controlled temperature of 450-550 DEG C so as to obtain a mesoporous silica molecular sieve KIT-6 provided with oxygen vacancy and loaded with tungsten trioxide by utilizing H2 as a reducing agent; and finally, removing the mesoporous silica molecular sieve KIT-6 by use of a 10wt% HF aqueous solution, thereby obtaining the mesoporous WO[3-x] visible-light-driven photocatalyst with oxygen vacancy and relatively large specific surface area and pore diameter. The mesoporous WO[3-x] visible-light-driven photocatalyst with oxygen vacancy is capable of effectively utilizing lights to rapidly catalyze CO2 so as to generate methane, and is high in catalysis efficiency, simple in preparation process and needed equipment, environmentally friendly in preparation process and free from pollution.

Description

technical field [0001] The invention relates to a mesoporous WO with oxygen vacancies 3-x The visible light catalyst and its preparation method and application belong to the field of nanotechnology. Background technique [0002] In recent years, the use of solar photocatalytic reduction of CO 2 Synthetic organic technology has received more and more attention. This technology not only utilizes carbon-free and renewable solar energy resources, but also converts CO emissions from factories and cars. 2 Collect and restore it for use as new fuel. Semiconductor photocatalytic materials generate photogenerated carriers (electrons-holes) under the excitation of sunlight, respectively induce reduction-oxidation to convert CO 2 and H 2 O synthetic hydrocarbon fuels. Compared with the traditional thermal reduction method, this process can be carried out at high temperature and normal pressure, H and O elements can be obtained from water, directly use solar energy without consumi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J23/30
Inventor 赵喆汪李超汪玉刘志福
Owner SHANGHAI INST OF TECH
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