Potassium Ferrate(VI)를 이용한 Benzothiophene 분해특성 연구

Abstract

Polycyclic aromatic sulfur hydrocarbon(PASHs) atr a group of toxic and/or mutagenic compound which are abundant in petroleum and coal tars. These compounds are also present in effluents from petroleum and coal liquefaction industries. PASHs were found to bioconcentrate more significantly than sulfur-free polycyclic aromatic compounds and have been shown to accumulate in sediments, plants and animal tissues. These PASHs are among the most refractory compounds in the residuals at contaminated site. This contamination is one of the recent major issues because this chemical is toxic, non-biodegradable and extremely persist in the environment. Therefore the conventional activated sludge process dose not effectively degrade these toxic compounds. the biodegradability of PASHs suggests that physical-chemical methods may be more effective for degrading these pollutants in environmental systems 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. Ferrate(VI) is iron inoxidation state 6-polar and dissolve completely in an aqueous solution and have oxidative high. Also, the final resolved product is iron in 3-polar and have the properties being able to use not only friendly environment but flocculant. Also, ferrate(VI) is able to use disinfectant and super-iron(VI) battery. In the present study, the degradation characteristics of BT by ferrate(VI) oxidation were studied. Degradation of benzothiophene(BT) in the aqueous phase by potassium ferrate(VI) was investigated. Potassium ferrate(VI) was prepared by the wet oxidation method. The degradation efficiency of BT was measured at various values of pH, ferrate(VI) dosage and temperature, ionic strength. BT was degraded rapidly within 30 seconds by ferrate(VI). It was 30mg/L that the resonable injection-concentration of necessary ferrate(VI) to degradation of BT. The highest degradation efficiencies of BT was achieved at pH 5, 20.5℃. In addition, the intermediate analysis for the reaction of BT and ferrate(VI) has been conducted using GC-MS. Benzene, styrene, benzaldehyde, formaldehyde, benzoic acid, formic acid, and acetic acid were identified as reaction intermediates, and SO42- was identified as an end product.