化学
分解
降级(电信)
激进的
电子顺磁共振
污染物
核化学
废水
清除
质谱法
可重用性
环境化学
色谱法
有机化学
环境工程
软件
抗氧化剂
工程类
程序设计语言
物理
电信
核磁共振
计算机科学
作者
Hongwei Luo,Chenyang Liu,Ying Cheng,Yifeng Zeng,Dongqin He,Xiangliang Pan
标识
DOI:10.1016/j.scitotenv.2021.147724
摘要
The biggest problem with Fe/PMS (peroxymonosulfate) system is the slow generation rate of SO4− due to inefficient Fe3+/Fe2+ cycle and the low decomposition efficiency of PMS. Here, we report the Fe3+-enhanced decomposition of PMS by a two-dimensional transition metal dichalcogenide WS2 for pollutant degradation and E. coli disinfection. Experimental results showed that the removal rates of six representative pollutants were all above 90% under various pH conditions. Over a wide range of pH values (2–9), the removal rate of carbamazepine (CBZ) in PMS/WS2/Fe3+ system almost reached 100% within 10 min, and E. coli could be inactivated by 97.3% within 1 min. WS2 in the system accelerated the Fe3+/Fe2+ cycle and participated in the activation of PMS. Electron paramagnetic resonance (EPR) measurements and scavenging experiments demonstrated that the SO4− and HO radicals were the main active oxidative species. The degradation pathway of CBZ was revealed based on its intermediates as determined by liquid chromatograph-mass spectrometer (LC-MS). The presence of common anions such as Cl− and HCO3− in PMS/WS2/Fe3+ system noticeably affected the CBZ degradation. The characterization results verified the structural stability and the reusability of WS2. These research findings suggest that the combination of Fe3+ and WS2 is a promising method for PMS activation to remove organic pollutants and inactivate pathogenic bacteria during the process of wastewater treatment.
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