Method for preparing zinc oxide/zinc sulfide nano heterojunction photocatalyst

A photocatalyst and heterojunction technology, applied in physical/chemical process catalysts, chemical instruments and methods, chemical/physical processes, etc., to achieve the effects of easy reuse, good stability, and high photocatalytic hydrogen production efficiency

Active Publication Date: 2017-05-10
NANKAI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, nanoscale ZnO / ZnS heterojunction has not been reported

Method used

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  • Method for preparing zinc oxide/zinc sulfide nano heterojunction photocatalyst
  • Method for preparing zinc oxide/zinc sulfide nano heterojunction photocatalyst
  • Method for preparing zinc oxide/zinc sulfide nano heterojunction photocatalyst

Examples

Experimental program
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Effect test

Embodiment 1

[0024] A method for preparing ZnO / ZnS heterojunction nanoparticle photocatalyst, the steps are as follows:

[0025] 1) Dissolve 2.98 g (10 mmol) of zinc nitrate hexahydrate in 25 ml of N-N-dimethylformamide to form a solution 1, and dissolve 0.33 g (2 mmol) of terephthalic acid in 65 ml of N-N-dimethylformamide In methylformamide, solution 2 was formed, then solution 1 was added to solution 2, mixed evenly, placed at 100°C for reflux reaction for 12 hours, filtered after natural cooling, and the obtained solids were respectively washed with N-N-dimethylformamide The amide and methanol were washed 3 times, and finally vacuum-dried at 70 °C for 12 hours to obtain a white powdery solid metal-organic framework complex MOF-5.

[0026] 2) Add 80 mg of the above metal-organic framework complex MOF-5 and 160 mg of thioacetamide to 16 ml of ethanol, place in an oven at 120°C for 4 hours, centrifuge after natural cooling, and wash the obtained solid with ethanol After washing 3 times, ...

Embodiment 2

[0030] The steps are the same as in Example 1, except that the calcination at 550° C. for 15 minutes in an air atmosphere in Example 1 is changed to calcination for 30 minutes. The resulting ZnO / ZnS heterojunction is labeled as ZnOS-30. The hydrogen production efficiency of the material by photo-splitting water was 415.3 micromol / hour (1 g catalyst).

Embodiment 3

[0032] The steps are the same as in Example 1, except that the calcination at 550° C. for 15 minutes in an air atmosphere in Example 1 is changed to calcination for 45 minutes. The resulting ZnO / ZnS heterojunction is labeled as ZnOS-45. The hydrogen production efficiency of the material by photo-splitting water was 53.6 micromol / hour (1 gram of catalyst).

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Abstract

The invention provides a method for preparing a zinc oxide / zinc sulfide nano heterojunction photocatalyst. The catalyst is a heterojunction catalyst formed by loading ZnO to ZnS, and is formed through a two-step calcination method employing MOF-5 as a template, and an expression of the catalyst is ZnOS-x when ZnS-C is calcined in air for x minutes. The method has the advantages that (1) a heterojunction is firstly prepared by adopting a metal-organic frame complex as the template, and the catalyst prepared by the method compared with the prior art can reach a nanoscale and can be synthesized on a large scale; (2) the prepared catalyst is high in photocatalytic hydrogen production efficiency in visible light under the condition of not needing any co-catalyst; and (3) the prepared catalyst is good in stability and repeated utilization is facilitated.

Description

technical field [0001] The invention belongs to the technical field of nanomaterial preparation, and in particular relates to a method for preparing a zinc oxide / zinc sulfide heterojunction photocatalyst. Background technique [0002] In recent decades, with the increasingly serious energy crisis and environmental pollution facing the world, hydrogen energy has attracted widespread attention as a clean, renewable, and high-combustion secondary energy source, also known as "the future energy source". oil". Unlike oil or coal combustion produces SO 2 , CO 2 And other toxic substances, the products of hydrogen combustion are environmentally friendly water and heat. In addition, compared with the current fuels (petroleum, methane, coal, etc.), hydrogen can contain greater energy (119KJ / g) at the same mass, which is three times that of gasoline, and hydrogen can be easily stored and transported , to meet the needs of various environments. Therefore, hydrogen energy will be a...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J27/04
CPCB01J27/04B01J35/0013B01J35/004
Inventor 师唯赵秀霞程鹏
Owner NANKAI UNIV
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