A comparative study on phenazone degradation by sulfate radicals based processes
A comparative study on phenazone degradation by sulfate radicals based processes
复制标题
硫酸根基工艺降解非那酮的比较研究
DOI：
10.1016/j.envres.2020.110054
复制
发表时间：
2020
影响因子：
8.3
通讯作者：
Xu Lijie
中科院分区：
文献类型：
--
作者：
Gong Han;Chu Wei;Gan Lu;Gong He;Lin Jingjun;Wang Qinxing;Lai Wing Yiu;Xu Lijie
本文对UVA/Fe(II)/过硫酸盐(PS)和UVA/Fe(II)/过一硫酸盐(PMS)两种处理工艺对苯那酮(PNZ)的去除进行了比较研究。这两种工艺对PNZ的降解效率较高，矿化程度较高。PMS处理体系对PNZ的降解比PS处理体系更有效，因为产生了更多的自由基。而UVA/Fe(II)/PS工艺比UVA/Fe(II)/PS工艺具有更高的Δ总有机碳/PMx(单位PNZ衰减的总有机碳去除)。在UVA/Fe(II)/PS和UVA/Fe(II)/PMS工艺中，硫酸根和羟基分别对PNZ的降解起主导作用。UVA/Fe(II)/PS和UVA/Fe(II)/PMS工艺降解PNZ过程中分别检测到6种和7种中间产物。在检测到的中间体中，有6个为首次发现。UVA/Fe(II)/PS法比UVA/Fe(II)/PMS法去除毒性所需的时间更短，这可能是由于羟基产物的Kow值较低所致。结果表明，UVA/Fe(II)/PMS工艺对PNZ的降解效果较好，而UVA/Fe(II)/PS工艺对PNZ的脱毒效果较好。这两种基于硫酸根的工艺在PNZ等新兴污染物的降解、矿化和解毒方面具有良好的潜力。
In this paper, a comparative study on removal of the emerging pollutant phenazone (PNZ) by two treatment processes UVA/Fe(II)/persulfate (PS) and UVA/Fe(II)/peroxymonosulfate (PMS) was conducted. The two processes showed high efficiency in PNZ degradation, followed by a reasonable mineralization. The treatment system with PMS was found to be more efficient for PNZ degradation than that with PS due to the larger amounts of radicals generated. While the treatment process UVA/Fe(II)/PS showed higher ΔTOC/ΔSMX (TOC removal per unit of PNZ decay) than UVA/Fe(II)/PMS process. The sulfate and hydroxyl radicals played dominant roles in PNZ degradation in the UVA/Fe(II)/PS and UVA/Fe(II)/PMS process, respectively. Six and seven intermediates during PNZ degradation by UVA/Fe(II)/PS and UVA/Fe(II)/PMS process were detected, respectively. Among the detected intermediates, six of them are found for the first time. It takes shorter time for toxicity elimination by UVA/Fe(II)/PS process than UVA/Fe(II)/PMS, possibly due to the lower Kow values of hydroxylated products. The results demonstrate that UVA/Fe(II)/PMS process is more efficient in PNZ degradation, while UVA/Fe(II)/PS is more efficient in detoxification of PNZ. The two sulfate radicals based processes have good potentials in degradation, mineralization and detoxification of the emerging contaminants such as PNZ.