Redox Dechlorination of Aqueous Trichloroethylene Using Nano-Scale Iron Coupled with Persulfate

in International Symposium (oral presentation paper), 國際研討會(全文口頭發表)
標題Redox Dechlorination of Aqueous Trichloroethylene Using Nano-Scale Iron Coupled with Persulfate
AuthorsYi-Chu Huang, 黃益助, 林育暄, & 林志庭
會議名稱第 三 屆 兩 岸 四 地 環 境 論 壇
出版日期Dec 17 2007 12:0

With the increase in population and the development in industry, the improper discharge or leakage of various wastes produced by human being has already polluted the soil, water, air, and groundwater. The pollution is seriously hazardous to the ecosystem and human health.The characteristic of NSI synthesized in lab were determined by laser diffraction particle size analyzer and BET(Brunauer-Emmett-Teller) specific area analyzer. The diameter and specific surface of iron particle was 239 nm in average and 67 m2/g, respectively. The particles containing iron were identified by X-ray powder diffraction (XRD) at 2θ = 44.98°. Results of the first stage showed TCE degradation trend was gradually increased by 1 g NSI with the increase of reaction time in both aerobic and anoxic state. pH increased, but both ORP(redox potential) and DO(dissolved oxygen) decreased during the process. As the dosage of NSI decreased to 0.1 g, reductive state was hardly maintained after a long reaction time, leading to pH decreasing and ORP increasing. However, at the dosage of 1 g, the solution was kept stably in reductive state. The DO reduced rapidly with the raise of iron amount. In the reduction of TCE with NSI the amount of chloride release increased with the reduction of TCE. Results from the second stage demonstrated reaction rate enhanced with the increase of ferrous ion concentration, but too much ferrous ions did not significantly increase the degradation rate because of its reaction with sulfate free radical. Results of TCE degradation obtained at various initial pH using persulfate illustrated TCE degradation at neutral pH=7 was the best, at pH=9 was the worst. This can be attributed to the formation of ferric hydroxide precipitates under basic condition, which deactivates ferrous ion.

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