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Nano-material composite visible light catalyst and preparation method thereof

A nanomaterial and catalyst technology, applied in catalyst activation/preparation, chemical instruments and methods, physical/chemical process catalysts, etc., can solve the problems of load and regeneration preparation cost, low photoelectric conversion efficiency, low quantum efficiency, etc. Low, accelerated catalytic degradation rate, high visible light catalytic efficiency

Inactive Publication Date: 2009-12-16
XINXIANG UNIV
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  • Application Information

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Problems solved by technology

Traditional semiconductor photocatalytic materials generally have the following shortcomings: low photoelectric conversion efficiency, and can only absorb ultraviolet rays; the existing developed visible light-responsive photocatalysts also have the following shortcomings: low quantum efficiency, easy deactivation and photochemical corrosion, loading and regeneration and preparation costs

Method used

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  • Nano-material composite visible light catalyst and preparation method thereof
  • Nano-material composite visible light catalyst and preparation method thereof
  • Nano-material composite visible light catalyst and preparation method thereof

Examples

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Embodiment Construction

[0016] In order to better explain the present invention, examples are as follows:

[0017] The nanocomposite visible light catalyst consists of Ag@AgCl with a shell-core structure as the main part of the photocatalyst, and mesoporous molecular sieve MCM-41 as the catalyst carrier. The weight percentages of each component are: 5% silver, 5% silver chloride, and 90% MCM -41 molecular sieve; ethanol solution is a wetting agent, and the volume ratio of water to ethanol in the wetting agent is (v / v) 1:1. Mesoporous molecular sieve MCM-41 specific surface area 420m 2 / g, specific pore volume 1.07cm 3 / g, pore size 2.98nm.

[0018] The preparation method is as follows:

[0019] (1) Weigh appropriate amount of CTAB and NaOH to dissolve in deionized water, stir electromagnetically, slowly add TEOS dropwise after the solution is clear, and continue stirring at 25°C for about 6 hours after the dropwise addition is complete. Move it into a reactor with a polytetrafluoroethylene liner and plac...

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Abstract

The invention discloses a novel nano-material composite visible light catalyst and a preparation method thereof, and belongs to the field of fine chemicals. The catalyst comprises the following components in percentage by weight: 0.5 to 5 percent of elemental silver, 5 to 9.5 percent of silver halide, and 90 percent of mesoporous molecular sieve MCM-41 as a carrier. The catalyst has a novel shell-core nanometer structure, and is a visible light catalyst based on metal plasma effect and semiconductor photocatalytic effect. The catalyst is applicable to the fields of environmental pollution control and new energy development, has significant effects of degrading pollutants in water and producing hydrogen through water photolysis, is a catalytic material meeting the requirements of protecting environment and saving energy, overcomes the disadvantages that the prior photocatalyst is poor in the utilization ratio of visible light, low in catalytic activity, difficult to recycle and the like, and is worthy to be developed and applied.

Description

Technical field [0001] The invention relates to a novel composite nano visible light catalyst and a preparation method thereof, in particular to a visible light catalyst with a shell / core structure using a mesoporous molecular sieve as a carrier and a preparation method thereof, belonging to the field of fine chemicals. Background technique [0002] The heterogeneous photocatalytic process of semiconductors can react at room temperature, directly use sunlight, oxidatively decompose most organic pollutants into inorganic products such as carbon dioxide and water, and has no secondary pollution. An ideal environmental pollution control technology. Hydrogen is produced by solar energy photolysis, and solar energy is stored in the form of fuel hydrogen, and the key to realizing the conversion of light energy to chemical energy is photocatalytic materials. For photocatalytic water splitting to produce hydrogen, the main problems currently faced are quantum yield (the number of certain...

Claims

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Application Information

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IPC IPC(8): B01J27/08B01J23/50B01J27/10B01J35/02B01J37/02B01J37/16B01J37/08C02F1/30C01B3/04C02F101/38C02F103/30
CPCY02E60/364Y02E60/36Y02P20/584Y02W10/37
Inventor 周建伟程玉良黄建新黄艳芹高雯李静芳
Owner XINXIANG UNIV
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