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Abiotic Reductive Transformation of Pentachlorophenol on the Interface of Soil Colloids and Water

Author: ZengFang
Tutor: LiXiaoFeng
School: Guangxi University
Course: Plant Nutrition
Keywords: Soil colloids PCP Interface Reductive transformation Dechlorination
CLC: X53
Type: Master's thesis
Year: 2007
Downloads: 13
Quote: 0
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Abstract


Halogenated organic contaminants such as organochlorine more than strong biological toxicity, it is difficult to microbial degradation and transformation of their non-biological transformation is an important detoxification pathways. PCP is a common organochlorine contaminants in the soil, and environmental hazards. This article for the soil of our country suffer from a wide range of organic chlorine pollution problems, combined with the the international soil interface chemical process research focus to study different soil parent materials, the soil colloid interface for different soil types PCP abiotic reductive transformation process, as well as the addition of oxalic acid and ferrous and other reducing substances of the soil colloid interface PCP reductive transformation to provide a scientific basis for the natural purification of organochlorine and contaminated soil in situ soil multiphase system repair. Using the time to study balance method of soil colloid interface pentachlorophenol (PCP) reductive transformation kinetics, and addition of Fe 2 or oxalic acid soil colloid interface PCP reductive transformation affected the findings show that under anaerobic conditions, pentachlorophenol in soil colloids interface can occur some reductive transformation, adding 1.0mmol · L -1 oxalic acid or ferrous significantly improve soil colloid interface conversion of pentachlorophenol rate and reduction rate. After 19d reaction, the soil colloid interface pentachlorophenol average conversion rate (36.2 ± 19.7)%, oxalic acid or ferrous the soil colloids interface pentachlorophenol average conversion rate of 0.96 times and 2.1 times respectively. Soil colloid interface pentachlorophenol reduction transformation process can be apparent first-order kinetics described. Pentachlorophenol in soil colloids average conversion rate (0.026 ± 0.018) d -1 , but by the parent material of the soil type and soil development. Colloid interface of different soil types reductive transformation of pentachlorophenol ability turn for Rice the soil> latosols> lateritic red soil> red soil. Different Parent Materials soil colloid interface PCP reductive transformation capacity basalt sandstone> granite. Add oxalic acid or ferrous the soil colloids interface pentachlorophenol reduction rate were increased (0.08 ± 0.05) d -1 d -1 (0.12 ± 0.08). Add oxalic acid treatment of basalt, sandstone and shale and granite soil colloid interface pentachlorophenol reduction rate increased by 2.0 times, 2.0 times and 3.1 times, respectively. Add ferrous largest granite parent material of the soil colloid interface conversion of pentachlorophenol PCP reduction rate increased by 10.9 times, sand shale parent material of the soil colloids, followed by an increase of 3.2 times, basalt parent materials increased by 2.9 times In contrast, the reductive transformation effect of the degree of influence with only the soil colloidal processing. Add 1.0 mmol · L -1 the Fe 2 or oxalic acid can significantly promote the the soil colloids interface pentachlorophenol reductive transformation and chlorine ions generated. Purple paddy field and light foot purple paddy field system release after 19 days of reaction, the chloride ion concentration of 0.021 mMol of L -1 and 0.022 mmol L -1 . Add ferrous chloride ion generation are not added ferrous processing 1.4 (Purple mud Tian) and 1.6 times (light foot purple paddy field), chloride ion emission of oxalic acid treatment also increased 41.3% (purple paddy field) 65.4% (Zini field). The soil colloids reductive transformation of pentachlorophenol interface is controlled by surface reaction, the reduction rate and the pH value of the soil colloids, organic matter content of the relationship between the content of free iron, total iron, and a positive correlation between the specific surface area. Add ferrous ion and oxalic acid can increase the soil the colloid interface surface bound ferrous concentration to reduce Fe 3 / Fe 2 on the standard redox potential (E H 0 ), so as to promote the reductive transformation of pentachlorophenol. Dechlorination of organochlorine nature to reduce their toxicity and enhanced biodegradability key steps. The study found that PCP under anaerobic conditions in the different soil colloids interface reductive transformation, adding oxalic acid or ferrous sulfate can be accelerated the soil colloids interface reductive transformation of pentachlorophenol and dechlorination efficiency to explore accelerate remediation of contaminated soils governance new ways to provide experimental support.

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CLC: > Environmental science, safety science > Environmental pollution and its prevention > Soil Contamination and Control
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