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- Title
Effects of pH and Anions on the Generation of Reactive Oxygen Species (ROS) in nZVI-rGo-Activated Persulfate System.
- Authors
Ahmad, Ayyaz; Gu, Xiaogang; Li, Li; Lu, Shuguang; Xu, Yisheng; Guo, Xuhong
- Abstract
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 ·SO radicals' intensity increased in the acidic pH. Different scenarios have been observed in ·O 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 HCO (10 mM) and NO (100 mM) but decreased in the presence of Cl (10 and 100 mM), HCO (100 mM), and NO (10 mM). The degradation of anisole, probe for both ·OH and ·SO , was slightly enhanced by 10 mM NO anions but decreased in 100 mM salt solution. ·O intensity was increased while HCO (10 and 100 mM) and NO (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.
- Subjects
REACTIVE oxygen species; ANIONS; ANISOLE; IONS; IRON
- Publication
Water, Air & Soil Pollution, 2015, Vol 226, Issue 11, p1
- ISSN
0049-6979
- Publication type
Article
- DOI
10.1007/s11270-015-2635-8