Method for purifying pentachlorophenol in water through photocatalysis

A technology for purifying water and pentachlorophenol, applied in the field of environmental photocatalysis, can solve the problems of severe reaction conditions, PCP pollution, poor purification ability, etc., and achieve the effect of simple equipment, short process and high purification rate

Inactive Publication Date: 2011-07-13
BEIJING NORMAL UNIVERSITY
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  • Abstract
  • Description
  • Claims
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Problems solved by technology

[0007] The purpose of the present invention is to solve the pollution problem of PCP in the industrial production process, to provide a method for purifying PCP in water using bismuth silicate as a photocatalyst, which can overcome the high energy consumption, complicated operation, severe reaction conditions and purification ability of existing purification methods Poor disadvantages, with good economic and environmental benefits

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  • Method for purifying pentachlorophenol in water through photocatalysis
  • Method for purifying pentachlorophenol in water through photocatalysis

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Experimental program
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Effect test

Embodiment 1

[0028] Disperse 50 mg of bismuth silicate powder in 200 ml of PCP solution with an initial concentration of 2 mg / L, and ultrasonicate the mixture for 10 minutes under dark conditions to completely disperse the catalyst in the solution. Before irradiation, the mixture was magnetically stirred for 30 minutes in the dark to achieve adsorption equilibrium, and then irradiated with a 500-watt xenon lamp (wavelength 300-800 nm), adjusting the distance between the reaction liquid level and the head of the xenon lamp to be 20 cm. During the process of photocatalytic degradation, magnetic stirring is used to make the reaction solution uniform, and the temperature of the reaction solution is kept at (20±2) degrees by a water bath. Take 1 ml samples regularly, centrifuge to get the supernatant, and use HPLC to analyze the concentration of PCP after sampling. The results showed that after the reaction was carried out for 2 hours, the degradation rate of PCP was greater than 99.0%.

Embodiment 2

[0030] Disperse 50 mg of bismuth silicate powder in 200 ml of PCP solution with an initial concentration of 4 mg / L, and ultrasonicate the mixture for 10 minutes in the dark to completely disperse the catalyst in the solution. Before irradiation, the mixture was magnetically stirred for 30 minutes in the dark to achieve adsorption equilibrium, and then irradiated with a 500-watt xenon lamp (wavelength 300-800 nm), adjusting the distance between the reaction liquid level and the head of the xenon lamp to be 20 cm. During the process of photocatalytic degradation, magnetic stirring is used to make the reaction solution uniform, and the temperature of the reaction solution is kept at (20±2) degrees by a water bath. 1 ml samples were taken regularly, the supernatant was taken after centrifugation, and the concentration of PCP was analyzed by HPLC after sampling. The results showed that after 2 hours of reaction, the degradation rate of PCP reached 87.7%.

Embodiment 3

[0032] Disperse 50 mg of bismuth silicate powder in 200 ml of PCP solution with an initial concentration of 6 mg / L, and ultrasonicate the mixture for 10 minutes under dark conditions to completely disperse the catalyst in the solution. Before irradiation, the mixture was magnetically stirred for 30 minutes in the dark to achieve adsorption equilibrium, and then irradiated with a 500-watt xenon lamp (wavelength 300-800 nm), adjusting the distance between the reaction liquid level and the head of the xenon lamp to be 20 cm. During the process of photocatalytic degradation, magnetic stirring is used to make the reaction solution uniform, and the temperature of the reaction solution is kept at (20±2) degrees by a water bath. 1 ml samples were taken regularly, the supernatant was taken after centrifugation, and the concentration of PCP was analyzed by HPLC after sampling. The results showed that the degradation rate of PCP reached 84.5% after the reaction was carried out for 2 hour...

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Abstract

The invention relates to a method for purifying pentachlorophenol (PCP) in water through photocatalysis, which comprises the following processes of: mixing and stirring a bismuth silicate photocatalyst and pentachlorophenol sewage to be treated, performing ultrasonic dispersion, adsorbing and balancing, irradiating by using a xenon lamp and the like; and pentachlorophenol photocatalytic degradation reaction results prove that the pentachlorophenol in the water can be efficiently purified through the method. The invention can overcome the defects of high energy consumption, complex operation, violent reaction conditions, poor purification capacity and the like in the conventional purification method, provides a method having the advantages of short flow, simple equipment and good efficiency of purifying the pentachlorophenol, and has wide industrial application prospect.

Description

technical field [0001] The invention relates to a method for purifying pentachlorophenol (PCP) in water by using a bismuth silicate photocatalyst, belonging to the technical field of environmental photocatalysis. Background technique [0002] Pentachlorophenol (PCP) was once widely used as wood preservatives, rust inhibitors, disinfectants, fungicides, insecticides and herbicides. "(carcinogenic, teratogenic, mutagenic) effects and genotoxic organic refractory pollutants, which are not easily decomposed and easily enriched in organisms through the food chain, thus posing a serious threat to natural ecology and human health. Bureau included in the list of priority pollutants. At the same time, PCP can also be transformed into more toxic polychlorinated dibenzodioxins (PCDDs) and polychlorinated dibenzofurans (PCDFs) in the natural environment, so it is important to seek economical and environmentally friendly PCP purification technology. very important. [0003] Biological...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F9/08C02F101/36C02F1/30
Inventor 牛军峰李阳王文龙段延佩
Owner BEIJING NORMAL UNIVERSITY
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