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Preparation method of silver halide composite material

A composite material and silver halide technology, applied in chemical instruments and methods, molecular sieve catalysts, chemical/physical processes, etc., can solve problems such as low efficiency and low quantum yield, and achieve improved efficiency, enhanced response, and light absorption The effect of strength enhancement

Inactive Publication Date: 2012-08-01
SUN YAT SEN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The purpose of the present invention is to solve the problem of visible light catalyst catalyzing CO in the prior art. 2 The shortcomings of low efficiency, low quantum yield and the blank of silver halide materials in this application field provide silver halide in photocatalytic CO 2 Applications in the preparation of hydrocarbons, preferably silver halide composites with high stability and high activity to catalyze CO under visible light conditions 2 Applications for the preparation of hydrocarbon fuels

Method used

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  • Preparation method of silver halide composite material
  • Preparation method of silver halide composite material
  • Preparation method of silver halide composite material

Examples

Experimental program
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Embodiment 1

[0033] Reality Embodiment 1: Preparation of AgBr composite material

[0034] 1 g of GP, EGP, GO, CNT, GAC, Zeolite, TiO 2 The solid powder was added to 100 ml of 0.01 mol / L cetyltrimethylammonium bromide (CTAB) aqueous solution, ultrasonically dispersed for 30 minutes, and then stirred with a magnetic stirrer for 30 minutes to obtain a uniformly distributed suspension A. Take 0.0012 mol of AgNO 3 Add to 2.3 ml NH 4 OH (25 wt. % NH 3 ) to obtain mixed solution B. Then the B mixed solution was quickly added to the suspension A, and after magnetic stirring at room temperature for 12 h, the resulting precipitate was separated by a high-speed centrifuge and washed with ethanol for 5 times, and then dried at 75 °C. Then calcined at different temperatures of 200°C, 400°C, 500°C and 700°C for 3 hours to obtain 20.0% AgBr / GP, AgBr / EGP, AgBr / GO, AgBr / CNT, AgBr / GAC, AgBr / Zeolite, AgBr / TiO 2 composite material. Prepare 1.0%, 10.0%, 30.0% and 50.0% AgBr / GP, AgBr / EGP, AgBr by contr...

Embodiment 2

[0035] Example 2: AgX / GP Visible Light Catalytic CO 2 preparation of hydrocarbons

[0036] Visible light catalyzed CO 2 The reaction device for preparing hydrocarbons adopts a closed cylindrical stainless steel reactor. The stainless steel reactor has its own valve to facilitate the control of gas input and discharge. In order to facilitate the illumination, there is a sealable circular glass window with optical filter above the stainless steel reactor. A 500 W medium-pressure xenon light source was used as the visible light source to provide visible light of λ≥420 nm. Take 0.5 g of synthesized 1.0%, 10.0%, 20.0%, 30.0% and 50.0% (wt.AgBr / GP) AgBr / GP composite samples and disperse them in 100 ml of 0.2 mol / L KHCO 3 A suspension was formed in the solution, and the pH of the solution was adjusted to 8.5 with NaOH. Pure CO was continuously fed into the suspension through the control valve in the stainless steel reactor before the illumination started. 2 gas (purity 9...

Embodiment 3

[0039] Example 3: AgX / TiO 2 Visible light catalyzed CO 2 preparation of hydrocarbons

[0040] The stainless steel reactor described in Example 2 was used as the reaction device, and a 500 W medium-pressure xenon lamp light source was used to provide the visible light source with λ≥420 nm of visible light. 7.0%, 11.6%, 20.0%, 46.4% and 175.0% (wt.AgBr / wt.TiO 2 ) a series of AgBr / TiO 2 Nanocatalyst sample, dispersed in 100ml of 0.2 mol / L KHCO 3 A suspension was formed in the solution, and the pH of the solution was adjusted to 8.5 with NaOH. Pure CO was continuously fed into the suspension through the control valve in the stainless steel reactor before the illumination started. 2 gas (99.99% purity) for 30 min to remove oxygen from the solution. Then close the control valve and continue to introduce CO 2 The gas maintains the pressure in the reactor at about 7.5 MPa. Turn on the xenon lamp light source under magnetic stirring, and continue to irradiate for 5h....

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Abstract

The invention discloses a preparation method of a silver halide composite material. The silver halide composite material is a silver halide composite which is prepared by loading silver halide on the surface of a carrier with conductive performance, wherein silver halide content occupies 1.0% to 17.5% of weight of the carrier, the silver halide is silver bromide or silver iodide, and the carrier with conductive performance is slice graphite, expansion graphite, graphene, a carbon nano tube, granular activated carbon, zeolite and titanium dioxide. The composite material prepared by the wet method and the precipitation method is capable of enabling ultrafine silver halide nanometer particles to be evenly dispersed on the surface of the carrier with the conductive performance and restrains reuniting on the surface of the silver halide.

Description

[0001] This application is a divisional application of the Chinese invention patent application "Application of Silver Halide Composite Materials in the Preparation of Hydrocarbons from Carbon Dioxide Catalyzed by Visible Light". The original application number is 201110004589.9, and the filing date is January 11, 2011. technical field [0002] The invention relates to a preparation method of a silver halide composite material. Background technique [0003] carbon dioxide (CO 2 ) gases are considered to be the main cause of global warming. An estimated 66% of global warming is attributable to CO 2 . Humans emit 24 billion tons of CO every year 2 to the atmosphere, of which 22 billion tons are due to the burning of fossil fuels, thus reducing CO 2 The emission of emissions has become a focus of attention of countries all over the world. From the perspective of sustainable development, purely relying on the reduction of CO 2 The emission of greenhouse gases is bound to a...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J27/08B01J29/00
Inventor 何春苏敏华阿伯阿斯·慕达熊亚董汉英黄艳玲夏德华
Owner SUN YAT SEN UNIV
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