Chemosphere ( IF 8.1 ) Pub Date : 2017-12-30 , DOI: 10.1016/j.chemosphere.2017.12.194 Hongyu Dong , Guangfeng Wei , Wenjuan Fan , Shangchen Ma , Hongying Zhao , Weixian Zhang , Xiaohong Guan , Timothy J. Strathmann
Experimental work was undertaken in this study to re-investigate the mechanisms and active species responsible for oxidation of co-contaminants in the Cr(VI)/HSO3− reaction system. Batch experiments showed that the degradation rates of 4-chlorophenol (4-CP) correlated well with the rates of Cr(VI) reduction by sulfite in the same solutions, and that O2(aq) was necessary for the oxidation of 4-CP. Multiple lines of evidences indicate that Cr(VI)/HSO3− reaction is a SO4−-based oxidation process. SO3
− was ruled out through almost complete inhibition of methanol (MeOH) on 4-CP degradation. Considering the negligible inhibition of tert-butanol (TBA) on 4-CP degradation, SO4− was identified to be reactive species in Cr(VI)/HSO3− process. This result was further verified by almost no degradation of nitrobenzene and the inhibiting effect of Cl− in Cr(VI)/HSO3− process. This mechanism is beneficial to application of Cr(VI)/HSO3− system in wastewater treatment.
中文翻译：
重新研究反应性物质在亚硫酸盐Cr（VI）反应过程中有机共污染物氧化中的作用
实验工作在这项研究中重新调查负责在铬（VI）/ HSO共污染物的氧化机制和活性种被承担3 -反应体系中。批量实验表明，在相同溶液中4-氯苯酚（4-CP）的降解速率与亚硫酸盐还原Cr（VI）的速率相关，并且O 2（aq）是氧化4-CP所必需的。证据的多行显示，铬（VI）/ HSO 3 -反应是SO 4-基于氧化的过程。SO 3
-通过几乎完全抑制甲醇（MeOH）对4-CP降解来排除-。考虑到叔丁醇（TBA）对4-CP降解SO 4的抑制作用可忽略不计-被鉴定为反应性物质以Cr（VI）/ HSO 3 -过程。这个结果是由几乎没有降解硝基苯和Cl的抑制效果进一步验证-在铬（VI）/ HSO 3 -过程。这种机制是应用的Cr（VI）/ HSO的有益3 -在废水处理系统。
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