A 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: 2019-03-19
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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  • A method for preparing zinc oxide/zinc sulfide nano-heterojunction photocatalyst
  • A method for preparing zinc oxide/zinc sulfide nano-heterojunction photocatalyst
  • A method for preparing zinc oxide/zinc sulfide nano-heterojunction photocatalyst

Examples

Experimental program
Comparison scheme
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 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, naturally cooled and filtered, and the obtained solids were respectively treated with N-N-dimethylformamide. The amide and methanol were washed three times, and finally dried under vacuum at 70 °C for 12 h to obtain a white powdery solid metal-organic framework complex MOF-5.

[0026] 2) 80 mg of the above-mentioned metal-organic framework complex MOF-5 and 160 mg of thioacetamide were added to 16 ml of ethanol, placed in an oven at 120° C. for 4 hours, centrifuged after natural cooling, and the obtained solid was treated w...

Embodiment 2

[0030] The steps are the same as those 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 photocatalytic hydrogen production efficiency of this material was 415.3 μmol / hour (1 g of 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 photocatalytic hydrogen production efficiency of this material was 53.6 μmol / hour (1 g 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, in particular 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 faced by the world, hydrogen energy has attracted widespread attention as a clean, renewable, high-combustion secondary energy, and is also known as "the future". oil". Unlike oil or coal burning will produce SO 2 , CO 2 Like 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.), at the same mass, hydrogen energy contains greater energy (119KJ / g), which is 3 times that of gasoline. In addition, hydrogen energy is easy to store and transport. , adapt to the needs of various environments. Therefore, hydrogen energy will be an extremely i...

Claims

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Application Information

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Patent Type & Authority Patents(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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