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Reinvestigating the role of reactive species in the oxidation of organic co-contaminants during Cr(VI) reactions with sulfite
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. SO3radical dot was generated in Cr(VI)/HSO3 system based on the electron spin resonance spectra, which could be transformed to secondary radicals (SO4radical dot, SO5radical dot, and HOradical dot

). The contribution of SO5radical dot 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, SO4radical dot 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激进点-基于电子自旋共振谱在Cr(VI)/ HSO 3-系统中生成-可以转化为仲自由基(SO 4激进点-,SO 5激进点和HO激进点

)。SO 5的贡献激进点-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激进点-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。
更新日期:2017-12-31
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