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Nano silver/silver bromide visible light photocatalysis material and preparation thereof

A photocatalytic material, silver bromide technology, applied in the field of photocatalytic materials, can solve the problems of low utilization rate of solar energy, difficult to separate, etc., and achieve the effects of good conductivity, inhibition of decomposition, and improvement of absorption

Inactive Publication Date: 2008-10-08
SHANDONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] The present invention aims at the problems of low utilization rate of solar energy and difficulty in separation during repeated use of the current general-purpose photocatalytic material P25, and provides a nano-silver / silver bromide with high photocatalytic activity, easy separation, and high utilization of solar energy Visible light photocatalytic material, and a preparation method of the catalytic material is provided

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0016] (1) To prepare silver molybdate, 2.86 g of molybdenum oxide and 4.63 g of silver oxide were taken in a molar ratio of 1:1, mixed, pressed into tablets, and then sintered. Sintering at 300°C for 8 hours, the sintered product is silver molybdate;

[0017] (2) Preparation of silver bromide: Take 5g of silver molybdate and 100ml of concentrated hydrobromic acid, mix them, put them in an autoclave and heat them to 150°C, and leave them for 72 hours to allow sufficient ion exchange to occur. The resulting precipitates are first washed with concentrated nitric acid Rinse 5 times, and then rinse several times with deionized water until pH = 7, and the obtained product is silver bromide.

[0018] (3) Preparation of nanometer silver / silver bromide photocatalyst: the silver bromide that gets 0.2g second step is put into 10ml concentration and is the silver nitrate aqueous solution of 0.05mol / l, adds 0.06g glutamic acid, in water bath Reflux at 70°C for 3 hours to obtain nano-silv...

Embodiment 2

[0020] (1) Preparation of silver molybdate. Take 2.86g of molybdenum oxide and 4.63g of silver oxide, mix, press into tablets and sinter. Sintering at 400°C for 7 hours, the sintered product is silver molybdate;

[0021] (2) Preparation of silver bromide: Take 5g of silver molybdate and 100ml of concentrated hydrobromic acid, mix them, put them in an autoclave and heat them to 200°C, and leave them for 60 hours to allow sufficient ion exchange to occur. The resulting precipitates are first rinsed with concentrated nitric acid 5 times, and then rinsed several times with deionized water until pH = 7, and the obtained product is silver bromide.

[0022] (3) Preparation of nanometer silver / silver bromide photocatalyst: the silver bromide that gets 0.2g second step is put into 10ml concentration and is the silver nitrate aqueous solution of 0.05mol / l, adds 0.12g glutamic acid, in water bath Reflux at 70°C for 4 hours to obtain nano-silver / silver bromide photocatalyst.

Embodiment 3

[0024] (1) To prepare silver molybdate, take 2.86g of molybdenum oxide and 4.63g of silver oxide, mix, press into tablets and sinter. Sintering at 450°C for 7 hours, the sintered product is silver molybdate;

[0025] (2) Preparation of silver bromide: Take 5g of silver molybdate and 100ml of concentrated hydrobromic acid, mix them, put them in an autoclave and heat them to 190°C, and leave them for 65 hours to allow sufficient ion exchange to occur. The resulting precipitates are first rinsed with concentrated nitric acid 4 times, and then rinsed several times with deionized water until pH = 7, and the obtained product is silver bromide.

[0026] (3) Prepare nano-silver / silver bromide photocatalyst: get the silver bromide that 0.2g second step makes and put into 10ml concentration and be in the silver nitrate aqueous solution of 0.025mol / l, add 0.08g glutamic acid, in water bath 70 ℃ reflux for 4 hours to obtain nano-silver / silver bromide photocatalyst.

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Abstract

The present invention provides a nanometer silver / silver bromide visible light optical catalyzing material which consists of nanometer silver and silver bromide with a chemical formula of Ag / AgBr. The nanometer silver particles are loaded on the surface of the silver bromide and occupy 23.5 to 47 percent of the gross weight. The preparation method includes the following steps: (1) adopting a solid phase sintering method to synthesize silver molybdate, and obtain a mixture of molybdena and silver oxide, tabletting and then sintering; the sintered matter is the silver molybdate; (2) mixing the two according to a proportion of 1g of the silver molybdate and 20ml of acid hydrobromic and then putting into a high pressure kettle, heating to 150 to 220 DEG C and depositing for 48 to 72 hours; flushing the obtained deposit with a pH value of 7 to obtain the silver bromide; (3) mixing the silver bromide with the water solution of silver nitrate, adding glutamic acid after stirring, refluxing under a water bath of 70 DEG C, thus obtaining a nanometer silver / silver bromide optical catalyst. The present invention effectively restrains silver chloride from decomposing by utilizing the plasma effect of the nanometer silver particles and can utilize the energy of solar light more effectively.

Description

technical field [0001] The invention relates to a photocatalytic material applied to decompose water to produce hydrogen or decompose pollutants in air and water and a preparation method thereof, belonging to the technical field of photocatalytic materials. Background technique [0002] With the over-exploitation and utilization of resources and the aggravation of environmental pollution, the available resources for human beings are becoming increasingly scarce, and the living environment has been increasingly damaged. Energy and environmental issues have become two major issues of concern in the world today. At present, the world's energy mainly depends on non-renewable fossil resources, and more than 90% of my country's total energy consumption is non-renewable fossil energy; how to solve the current energy crisis? Solar energy is rich in resources, and the total amount reaching the earth in a year is 5.5×1026J, which is 10,000 times the global energy consumption in a year...

Claims

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Application Information

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IPC IPC(8): B01J27/08B01J23/50C01B3/04C02F1/30B01D53/86
CPCY02E60/364Y02E60/36Y02P20/133Y02W10/37
Inventor 黄柏标王朋张晓阳秦晓燕
Owner SHANDONG UNIV
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