title: Degradation of carbon tetrachloride in aqueous solution in the thermally activated persulfate system.
abstract: Thermal activation of persulfate (PS) has been identified to be effective in the destruction of organic pollutants. The feasibility of carbon tetrachloride (CT) degradation in the thermally activated PS system was evaluated. The experimental results showed that CT could be readily degraded at 50 °C with a PS concentration of 0.5M, and CT degradation and PS consumption followed the pseudo-first order kinetic model. Superoxide radical anion (O2(*-)) was the predominant radical species responsible for CT degradation and the split of CCl was proposed as the possible reaction pathways for CT degradation. The process of CT degradation was accelerated by higher PS dose and lower initial CT concentration. No obvious effect of the initial pH on the degradation of CT was observed in the thermally activated PS system. Cl(*-), HCO3(*-), and humic acid (HA) had negative effects on CT degradation. In addition, the degradation of CT in the thermally activated PS system could be significantly promoted by the solvents addition to the solution. In conclusion, the thermally activated PS process is a promising option in in-situ chemical oxidation/reduction remediation for degrading highly oxidized organic contaminants such as CT that is widely detected in contaminated sites.
authors.affiliation: State Environmental Protection Key Laboratory of Environmental Risk Assessment and Control on Chemical Process, East China University of Science and Technology, Shanghai 200237, China.
authors.forename: Minhui
authors.initials: M
authors.lastname: Xu
authors.affiliation: State Environmental Protection Key Laboratory of Environmental Risk Assessment and Control on Chemical Process, East China University of Science and Technology, Shanghai 200237, China.
authors.forename: Xiaogang
authors.initials: X
authors.lastname: Gu
authors.affiliation: State Environmental Protection Key Laboratory of Environmental Risk Assessment and Control on Chemical Process, East China University of Science and Technology, Shanghai 200237, China. Electronic address: lvshuguang@ecust.edu.cn.
authors.forename: Shuguang
authors.initials: S
authors.lastname: Lu
authors.affiliation: State Environmental Protection Key Laboratory of Environmental Risk Assessment and Control on Chemical Process, East China University of Science and Technology, Shanghai 200237, China.
authors.forename: Zhaofu
authors.initials: Z
authors.lastname: Qiu
authors.affiliation: State Environmental Protection Key Laboratory of Environmental Risk Assessment and Control on Chemical Process, East China University of Science and Technology, Shanghai 200237, China.
authors.forename: Qian
authors.initials: Q
authors.lastname: Sui
authors.affiliation: State Environmental Protection Key Laboratory of Environmental Risk Assessment and Control on Chemical Process, East China University of Science and Technology, Shanghai 200237, China.
authors.forename: Zhouwei
authors.initials: Z
authors.lastname: Miao
authors.affiliation: State Environmental Protection Key Laboratory of Environmental Risk Assessment and Control on Chemical Process, East China University of Science and Technology, Shanghai 200237, China.
authors.forename: Xueke
authors.initials: X
authors.lastname: Zang
authors.affiliation: State Environmental Protection Key Laboratory of Environmental Risk Assessment and Control on Chemical Process, East China University of Science and Technology, Shanghai 200237, China.
authors.forename: Xiaoliang
authors.initials: X
authors.lastname: Wu
mesh_terms: D002251:Carbon Tetrachloride / Q000737:chemistry*; D060587:Groundwater; D006358:Hot Temperature; D006812:Humic Substances; D006863:Hydrogen-Ion Concentration; D007700:Kinetics; D010084:Oxidation-Reduction; D010100:Oxygen / Q000737:chemistry; D012997:Solvents / Q000737:chemistry; D013440:Sulfides / Q000737:chemistry*; D013481:Superoxides / Q000737:chemistry; D055549:Volatile Organic Compounds; D014874:Water Pollutants, Chemical / Q000737:chemistry*; D018508:Water Purification / Q000379:methods*
chemical_list: D006812:Humic Substances; D012997:Solvents; D013440:Sulfides; D055549:Volatile Organic Compounds; D014874:Water Pollutants, Chemical; C051552:persulfides; D013481:Superoxides; D002251:Carbon Tetrachloride; D010100:Oxygen
keywords: Carbon tetrachloride; Groundwater; Persulfate; Superoxide radical anion; Thermal activation