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Effects of Nitrite on the Photodegradation of 4-Chlorophenol in the Water

Author: WangXinYing
Tutor: ZhangYaoBin
School: Dalian University of Technology
Course: Environmental Engineering
Keywords: 4 - Chlorophenol NO2- pH Humic acid Fe3
CLC: X52
Type: Master's thesis
Year: 2011
Downloads: 46
Quote: 0
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Abstract


Photodegradation phenolic water pollutants in the environment experienced an important process. In recent years, as a typical phenolic pollutants, 4 - chlorophenol photodegradation of the body of water has been a research focus of many scholars. NO2-and NO3-large water bodies, due to the photochemical activity of NO2 and NO3-, such waters, the migration of pollutants transformation may also be affected by the impact can not be ignored. Many research examines the different reactive substances of different concentrations and pH and coexisting substances and their degradation. Most of the research has been devoted investigated under UV irradiation or added to the system photodegradation of pollutants in a variety of catalysts, due to the different experimental conditions and natural water bodies, these studies we understand natural water bodies - chlorine the phenol photodegradation play a role is limited. Natural water body, especially in the presence of NO2-4 - chlorophenol Photodegradation little has been reported under the waters. In this paper is mainly to carry out the following tasks: xenon lamp light source, under simulated sunlight conditions, NO2-concentration and pH 4 - chlorophenol photodegradation impact. The main conclusions are as follows: (1) using GC-MS identification of 4 - chlorophenol photolysis products, the resulting spectra indicated that 4 - chlorophenol photolysis generate 1,4 - benzoquinone, and 4 - The nitration product chlorophenol 2 - nitro-4 - chlorophenol. (2) were added to the reaction system, 10mg / L, 20mg / L, 40 mg / L NO2-. Experimental results show that when the NO2-concentration of 20 mg / L, 4 - chlorophenol degradation rate, but has declined in the 10 mg / L and 40 mg / L NO2-system, 4 - chlorophenol degradation rate . And 4 - chlorophenol nitration product formation increases with the concentration of NO2-and has increased; (3) examine pH were 3.85,6.60 and 8.50 of the reaction system, the results show that the degradation rate of 4 - chlorophenol With increasing pH and slows down, while the 2 - nitro - 4 - chlorophenol generation amount with pH increase and decrease. Free radical the masking experiments show radical masking agent to the three different pH systems, 4 - chlorophenol degradation were significantly weakened. Added to the reaction system under simulated sunlight, respectively, humic acid and Fe3 investigated 4 - chlorophenol photolysis rate. Concluded as follows: (1) when the humic acid concentration of 5mg / L, 4 - chlorophenol photodegradation get promoted, 2 - nitro-4 - chlorophenol production also with 4 - chlorophenol degradation rate increases Large increases. And when the humic acid concentration increased to 15mg / L, 4 - chlorophenol degradation has been inhibited. (2) is added to the reaction system of 10 mg / L Fe3, 4 - chlorophenol degradation was inhibited, corresponding to 2 - nitro-4 - chlorophenol generation is also reduced. Expect this study to better understand the phenolic pollutants NO2-existing degradation of water bodies provide valuable reference information.

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CLC: > Environmental science, safety science > Environmental pollution and its prevention > Water pollution and its control
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