Ferrate(VI)를 이용한 수중 2-chlorophenol의 분해특성 연구

Abstract

2-chlorophenol(2-CP) which is widely used in paper, pulp, pesticide, and herbicide industries, is very toxic and poorly biodegradable pollutant. Also 2-CP is one of the EPA(Environmental Protection Agency) priority pollutants. Trace toxic by-products such as PAHs, dioxins, and furans are frequently found in the incineration of 2-CP and considered carcinogens or mutagens. Recently, the innovative Ferrate(VI) producing methods with less costs and less energy have been reported by researchers in US and UK. Ferrate(VI) is Powerful, fast acting, work in small doses and the final product of ferrate treatment is a non-toxic compound. And Ferrate(VI) can replace the power of chlorine and ozone for water and wastewater treatment without producing carcinogenic disinfection by-products (DBPs) like THMs, HAAs, and bromates. More powerful oxidation: Ferrate(VI)(2.2 volts) 〉 Ozone(2.08) 〉 H2O2(1.78) 〉 Chlorine(1.36 volts). Also Ferrate(VI) can simultaneously perform as an oxidant, coagulent, and disinfectant. In the present study, the degradation characteristics of 2-CP by Ferrate(VI) oxidation were studied. The degradation efficiency of 2-CP in aqueous solution was investigated at various pH values, Fe(VI) dose, initial concentrations and aqueous solution temperature of 2-CP. GC-ECD was used to analyze 2-CP. 2-CP has not been degraded without application of Fe(VI) over fifteen minutes. The optimum degradation efficiencies of 2-CP increased either with pH 7.0 or aqueous solution temperature was 25℃. Also, the experimental results showed that 2-CP removal efficiency increased with the decrease of initial concentration of 2-CP. In addition, intermediate products were identified by GC-MS techniques. Than Acetic acid, Formic acid, Benzaldehyde, Benzoic acid was identified as a reaction intermediate of the Ferrate(VI).