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Noble metal decorated nanometer ZnS/polyaniline composite photocatalyst and preparation method thereof

A technology of polyaniline and precious metals, applied in the field of composite nano-photocatalysts and their preparation, can solve the problems of low catalytic efficiency and strengthen catalysts, achieve good confinement and protection, inhibit recombination, and improve utilization

Inactive Publication Date: 2010-06-02
SHANGHAI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the catalytic efficiency of conjugated polymer systems for certain reactions is still not high; for photocatalytic reactions typically characterized by redox reactions, how to enhance the reactivity of the catalyst is an important direction

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0018] Example 1: Mix 20.00mL 0.44% polyaniline NMP solution with 10.00mL 0.1M ZnCl 2 Mix the NMP solution, stir at 60°C for 30min, add 0.1M Na 2 The aqueous solution of S was 10.10mL, and the dropwise addition was completed within 3min, and the reaction was continued for 30min, and 10.00mL of 0.0001M PdCl was added 2 In the aqueous solution, the amount of Pd deposited was controlled to be Pd / ZnS (molar ratio) = 0.1%. After stirring for 10 minutes, the reaction mixture was centrifuged and washed 3 times, and the separated precipitate was vacuum-dried at 130° C. for 24 hours. The dried precipitate was placed in H 2 After activating at room temperature for 30 minutes in the atmosphere, the Pd-modified nano-ZnS / polyaniline composite photocatalyst can be obtained.

Embodiment 2

[0019] Example two: 20.00mL 0.44% polyaniline NMP solution and 10.00mL 0.1M ZnCl 2 Mix the NMP solution, stir at 60°C for 30min, add 0.1MNa dropwise to the above solution 2 The aqueous solution of S 10.00mL was added dropwise within 3 minutes, and the reaction was continued for 30 minutes. The reaction mixture was washed with water and centrifuged three times, and the obtained precipitate was vacuum-dried at 130°C for 24 hours. After grinding, take 1g and disperse in 20.00mL water, add 45.00mL 0.001M Na 2 S aqueous solution, after stirring for 10 minutes, add 10.00mL 0.00265M chloroauric acid aqueous solution, the Au deposition amount is controlled to be Au / ZnS (molar ratio) = 0.5%, continue to stir for 5 minutes, then suction filter and rinse, and the obtained precipitate is vacuum-dried at 80°C . Grinding and placing in H 2 The Au-modified nano-ZnS / polyaniline composite photocatalyst can be obtained by activating at room temperature for 8 hours in the atmosphere.

Embodiment 3

[0020] Example three: 20.00mL 0.44% polyaniline NMP solution and 10.00mL 0.1M ZnCl 2 Mix the NMP solution, stir at 60°C for 30min, add 0.1MNa dropwise to the above solution 2 The aqueous solution of S was 10.30mL, and the dropwise addition was completed within 3min. The reaction was continued for 30min, and 10.00mL of 0.0003M chloroplatinic acid aqueous solution was added. The amount of Pt deposited was controlled to be Pt / ZnS (molar ratio) = 0.3%, and the reaction mixture was centrifuged after stirring for 10min. Separation and washing with water three times, and the separated precipitate was vacuum-dried at 130°C for 24 hours. The dried precipitate was placed in H 2 After activation at room temperature for 6 minutes in the atmosphere, the Pt-modified nano-ZnS / polyaniline composite photocatalyst can be obtained.

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Abstract

The invention discloses a method for preparing a noble metal (palladiumpalladium, platinum, silver or gold) decorated nanometer ZnS / polyaniline composite photocatalyst, belonging to the technical field of chemical preparations. The method is characterized in that the photocatalyst is obtained through depositing the noble metals on the surface of the nanometer ZnS / polyaniline composite photocatalyst, and comprises the following steps of: (1) introducing a sulfur source by using a compound of conductive polymer polyaniline and Zn2+ as a matrix and using a coordination coordination conversion method to convert Zn2+ into sulfur-enriched nanometer ZnS among polyaniline links to prepare a composite system of the sulfur-enriched nanometer ZnS / polyaniline; and (2) reacting a noble metal ion with excessive S2-in the composite system of the sulfur-enriched nanometer ZnS / polyaniline to prepare the noble metal decorated nanometer ZnS / polyaniline composite photocatalyst by means of chemical deposition. The invention has the characteristics of convenient methods and no need of expensive equipment, the prepared catalyst has favorable conductivity and stronger photocatalysis, and can be applied to the fields of preparing methanol by catalyzing and reducing carbon oxide, managing environment pollution, sterilizing and the like.

Description

technical field [0001] The invention relates to a composite nano photocatalyst and a preparation method thereof, in particular to a noble metal modified nano ZnS / polyaniline composite photocatalyst and a preparation method thereof. Background technique [0002] With the rapid development of society and economy, energy shortage, resource shortage and environmental pollution have become global problems that threaten human survival and urgently need to be solved. Therefore, using natural renewable resources to develop environmentally friendly products and technologies has become an inevitable trend of sustainable development. Photocatalytic technology is characterized by the ability to utilize natural and precious solar energy, high efficiency and energy saving, easy operation and no secondary pollution. This environmentally friendly new technology has broad application prospects in the fields of waste water and gas purification, organic synthesis and antibacterial material pr...

Claims

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Application Information

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IPC IPC(8): B01J31/28
Inventor 刘引烽冒海燕陆强杨红冉明浩张夏聪
Owner SHANGHAI UNIV
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