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Role of Cysteine in Enhanced Degradation of Trichloroethane under Ferrous Percarbonate System
Chemical Engineering Journal ( IF 15.1 ) Pub Date : 2021-05-07 , DOI: 10.1016/j.cej.2021.130221
Usman Farooq , Muhammad Sajid , Ali Shan , Xinhai Wang , Shuguang Lyu

The removal of toxic contaminants such as trichloroethane (TCA) from groundwater had a huge impact due to associated health hazards. Advanced oxidation technology has an outstanding potential to remove these toxins. However, the redox cycling of Fe(II)/Fe(III) is mostly a barrier for the efficient removal of these contaminants. In this study, we extracted two in one nature of cysteine (CYS) to enhance TCA degradation in Fe(II)/sodium percarbonate (SPC) system. The chelating and reducing capability of CYS, concentration impact of Fe(II), SPC, and pH role were all thoroughly investigated. The existence of hydroxyl (OH) and superoxide (O2–●) radicals were confirmed through quencher tests. Furthermore, the electron paramagnetic resonance (EPR) spectra evaluated the enhancement of OH radicals in the Fe(II)/CYS/SPC system due to the electron transfer capability of CYS. The Fe(II)/CYS/SPC showed excellent recyclability and stability characteristics up to 68% TCA degradation in the fourth round. The degradation products and dechlorination analysis confirmed the existence of non-toxic final products. Similarly, the system demonstrated admirable performance in a real groundwater system, bolstering its real-time industrial applications. Conclusively, Fe(II)/CYS/SPC can be a viable and effective method for degrading chlorinated organic hydrocarbons in groundwater.



中文翻译:

半胱氨酸在过碳酸亚铁体系下增强三氯乙烷降解的作用

由于相关的健康危害,从地下水中去除有毒污染物(例如三氯乙烷(TCA))具有巨大影响。先进的氧化技术具有去除这些毒素的巨大潜力。但是,Fe(II)/ Fe(III)的氧化还原循环主要是有效去除这些污染物的障碍。在这项研究中,我们提取了两种性质的半胱氨酸(CYS)来增强三价铁在Fe(II)/过碳酸钠(SPC)系统中的降解。CYS的螯合和还原能力,Fe(II)的浓度影响,SPC和pH值作用都进行了彻底的研究。羟基(OH )和超氧化物(O 2 –●自由基通过淬灭试验确认。此外,由于CYS的电子转移能力,电子顺磁共振(EPR)光谱评估了Fe(II)/ CYS / SPC系统中OH 自由基的增强。Fe(II)/ CYS / SPC在第四轮中显示出出色的可回收性和稳定性,TCA降解高达68%。降解产物和脱氯分析证实了无毒最终产物的存在。同样,该系统在真实的地下水系统中显示出令人赞叹的性能,从而增强了其实时工业应用。结论是,Fe(II)/ CYS / SPC可以是一种降解地下水中氯代有机烃的可行而有效的方法。

更新日期:2021-05-13
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