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Application of nano TiO2/CdS composite photocatalyst in normal-temperature degradation of hydrocarbon compounds

A technology of hydrocarbons and composite light, applied in nanotechnology, nanotechnology, nanotechnology for materials and surface science, etc., to achieve good photocatalytic activity and stability, easy collection and recycling, and elimination of HC gas pollutants Effect

Inactive Publication Date: 2015-12-30
FUJIAN INST OF RES ON THE STRUCTURE OF MATTER CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

But TiO 2 / CdS composite photocatalyst has not been reported in the literature on the photocatalytic degradation of HC gas

Method used

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  • Application of nano TiO2/CdS composite photocatalyst in normal-temperature degradation of hydrocarbon compounds
  • Application of nano TiO2/CdS composite photocatalyst in normal-temperature degradation of hydrocarbon compounds
  • Application of nano TiO2/CdS composite photocatalyst in normal-temperature degradation of hydrocarbon compounds

Examples

Experimental program
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Effect test

Embodiment 1

[0019] Example 1: TiO 2 Preparation of / CdS Composite Photocatalyst

[0020] Add 1 part of tetrabutyl titanate into 10 parts of ethylene glycol with stirring, then add 4 parts of citric acid into the above ethylene glycol, and continue stirring to form a sol. Heat the sol to 523K to form a xerogel, transfer the xerogel to an alumina crucible, place it in a muffle furnace for heat treatment at 823K for 10 hours, and obtain TiO 2 Nano powder, the powder is ground for use.

[0021] 0.108g of CdCl 2 2.5H 2 O and 0.036g of thiourea were dissolved in 90mL of ethanol, heated and magnetically stirred, and the temperature of the solution was controlled at 333K. Dissolve 0.03 g of sodium hydroxide in 30 mL of absolute ethanol, then quickly inject the sodium hydroxide ethanol solution into the CdCl 2 2.5H 2 In the mixed solution of O and thiourea, continue stirring and heating at 333K for 24 hours, and then naturally cool to room temperature. The precipitate was collected by centr...

Embodiment 2

[0023] Example 2: Fixed bed photocatalytic degradation of ethane gas

[0024] The photocatalytic performance test of the photocatalyst fixed bed degrading ethane gas of the present invention is carried out under normal temperature and simulated sunlight. The experimental process is as follows:

[0025] Weigh respectively the TiO prepared in Example 1 2 / CdS composite photocatalyst 0.15g, spread to the bottom of the photoreactor with a volume of 450mL, and seal the reactor. Inject 90 μL of high-purity ethane gas into the photoreactor with a gas microextractor. Keep the reactor away from light for 1 hour, the gas reaches the equilibrium of adsorption and desorption, and then turn on the 300WXe light source. Samples were taken every 10 minutes, and a gas chromatograph was used to detect changes in the concentration of ethane gas in the reactor.

[0026] Test results such as image 3 As shown, under simulated solar irradiation, TiO 2 / CdS composite photocatalysts exhibit exc...

Embodiment 3

[0027] Example 3: Fixed bed photocatalytic degradation of ethylene gas

[0028] The photocatalytic performance test of the photocatalyst fixed bed degrading ethylene gas of the present invention is carried out under normal temperature and simulated sunlight. The experimental process is as follows:

[0029] Take by weighing the TiO prepared in embodiment 1 2 / 1wt%CdS composite photocatalyst 0.15g, spread to the bottom of a photoreactor with a volume of 450mL, and seal the reactor. Inject 90 μL of high-purity ethylene gas into the photoreactor with a gas microextractor. Keep the reactor away from light for 1 hour, the gas reaches the equilibrium of adsorption and desorption, and then turn on the 300WXe light source. Samples were taken every 10 minutes in the dark state and every 5 minutes in the light condition, and gas chromatography was used to detect the change of ethylene gas concentration in the reactor.

[0030] Test results such as Figure 4 As shown, under simulated...

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Abstract

The invention relates to application of a nano TiO2 / CdS composite photocatalyst in normal-temperature degradation of hydrocarbon compounds (HC). The TiO2 / CdS composite photocatalyst is low in cost, high in photocatalytic activity and good in stability and can efficiently perform photocatalytic degradation on HC gas at normal temperature under simulated sunlight irradiation. Meanwhile, photocatalyst is quite easy to collect and recycle and has good application prospects in removing HC gas in atmosphere at normal temperature.

Description

technical field [0001] The present invention relates to a kind of nano TiO 2 The application of the / CdS composite photocatalyst to degrade hydrocarbons (HC) at normal temperature belongs to the field of inorganic nanometer photocatalytic materials. Background technique [0002] With the rapid development of my country's urbanization process, the number of urban motor vehicles is also rising. According to statistics, at the end of 2013, the number of civilian vehicles in the country reached 137 million. The resulting urban traffic congestion and serious environmental pollution have become one of the bottlenecks restricting urban social and economic development. The 2013 Annual Report on the Prevention and Control of Motor Vehicle Pollution in China issued by the Ministry of Environmental Protection pointed out that in 2012, the national motor vehicle emissions were 46.121 million tons of pollutants, of which nitrogen degradation products (NO x ) 6.400 million tons, 622,00...

Claims

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Application Information

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IPC IPC(8): B01J27/04B01D53/72B01D53/86B82Y30/00B82Y40/00
Inventor 张耀红王丹易志国
Owner FUJIAN INST OF RES ON THE STRUCTURE OF MATTER CHINESE ACAD OF SCI
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