Tang Ping, Jiang Wenchao, Lu Shuguang, Zhang Xiang, Xue Yunfei, Qiu Zhaofu, Sui Qian
a State Environmental Protection Key Laboratory of Environmental Risk Assessment and Control on Chemical Process , East China University of Science and Technology , Shanghai , People's Republic of China.
Environ Technol. 2019 Jan;40(3):356-364. doi: 10.1080/09593330.2017.1393012. Epub 2017 Oct 26.
In this study, the degradation performance of carbon tetrachloride (CT) by sodium percarbonate (SPC) activated with Fe(II) in the presence of ethyl alcohol (EA) was investigated. The experimental results showed that CT could be readily degraded and the optimal EA/Fe(II)/SPC/CT molar ratio for CT reduction was 100/50/20/1. Superoxide radical anion ( ) and hydroxyethyl radical (CHCHOH, HER) were the predominant radical species responsible for CT degradation and EA could regulate the generation of and HER in the system. Further investigation for the solution matrix effects suggested that Cl, , , and humic acid had negligible influences on CT degradation, while had negative effect in EA/Fe(II)/SPC system. On the other hand, the application of SPC/Fe(II)/EA technique is favorable to acidic condition is effective at a wide pH range of 3.0-7.0. In summary, CT degradation in Fe(II)-activated SPC system can be significantly promoted by addition of solvents, and these findings provide an innovative technology for the degradation of highly oxidized organic contaminants.
本研究考察了在乙醇（EA）存在下，用Fe（II）活化过碳酸钠（SPC）对四氯化碳（CT）的降解性能。实验结果表明，CT能够被迅速降解，CT还原的最佳EA/Fe（II）/SPC/CT摩尔比为100/50/20/1。超氧自由基阴离子（ ）和羟乙基自由基（CHCHOH，HER）是导致CT降解的主要自由基物种，且EA能够调节体系中 和HER的生成。对溶液基质效应的进一步研究表明，Cl、 、 和腐殖酸对CT降解的影响可忽略不计，而 在EA/Fe（II）/SPC体系中有负面影响。另一方面，SPC/Fe（II）/EA技术适用于酸性条件，在3.0 - 7.0的宽pH范围内均有效。总之，添加溶剂可显著促进Fe（II）活化SPC体系中CT的降解，这些研究结果为高氧化态有机污染物的降解提供了一种创新技术。
