Effects of pH and Anions on the Generation of Reactive Oxygen Species (ROS) in nZVI-rGo-Activated Persulfate System
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- 作者：Ayyaz Ahmad ; Xiaogang Gu ; Li Li ; Shuguang Lu ; Yisheng Xu…
- 关键词：Reactive oxygen species ; Persulfate ; nZVI ; rGO ; Solution pH value ; Anions
- 刊名：Water, Air, and Soil Pollution
- 出版年：2015
- 出版时间：November 2015
- 年：2015
- 卷：226
- 期：11
- 全文大小：3,810 KB
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Xiaogang Gu (1) (3)
Li Li (1)
Shuguang Lu (3)
Yisheng Xu (1)
Xuhong Guo (1) (4)
1. State Key Laboratory of Chemical Engineering, East China University of Science and Technology, Shanghai, 200237, People’s Republic of China
2. Department of Chemical Engineering, University of Gujrat, Gujrat, Punjab, Pakistan
3. State Environmental Protection Key Laboratory of Environmental Risk Assessment and Control on Chemical Process, East China University of Science and Technology, Shanghai, 200237, People’s Republic of China
4. Key Laboratory of Xinjiang Uygur Autonomous Region and Engineering Research Center of Xinjiang Bingtuan of Materials-Oriented Chemical Engineering, Shihezi University, Xinjiang, 832000, People’s Republic of China - 刊物类别：Earth and Environmental Science
- 刊物主题：Environment
Environment
Atmospheric Protection, Air Quality Control and Air Pollution
Waste Water Technology, Water Pollution Control, Water Management and Aquatic Pollution
Terrestrial Pollution
Hydrogeology - 出版者：Springer Netherlands
- ISSN：1573-2932
文摘
In this study, nanosized zero-valent iron-reduced graphene oxide (nZVI-rGO)-activated persulfate (PS) was used to investigate the generation of reactive oxygen species (ROS) for the degradation of trichloroethylene (TCE) in the aqueous solution. More than 98 % of TCE was degraded within 2 min under experimental conditions. The generation of ·OH increased when the pH was shifted toward the basic region while ·SO4 ?/sup> radicals-intensity increased in the acidic pH. Different scenarios have been observed in ·O2 ?/sup> generation in the neutral and strong basic pH and decreased in acidic or slightly basic pH. In addition, the intensity of ·OH was increased with the addition of HCO3 ?/sup> (10 mM) and NO3 ?/sup> (100 mM) but decreased in the presence of Cl?/sup> (10 and 100 mM), HCO3 ?/sup> (100 mM), and NO3 ?/sup> (10 mM). The degradation of anisole, probe for both ·OH and ·SO4 ?/sup>, was slightly enhanced by 10 mM NO3 ?/sup> anions but decreased in 100 mM salt solution. ·O2 ?/sup> intensity was increased while HCO3 ?/sup> (10 and 100 mM) and NO3 ?/sup> (100 mM) anions were used. nZVI-rGO-activated PS process could remove TCE in aqueous effectively, and the ROS generation and intensity were influenced by solution pH values and anions. Keywords Reactive oxygen species Persulfate nZVI-rGO Solution pH value Anions