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。