title: Enhanced ozonation degradation of di-n-butyl phthalate by zero-valent zinc in aqueous solution: performance and mechanism.
abstract: Enhanced ozonation degradation of di-n-butyl phthalate (DBP) by zero-valent zinc (ZVZ) has been investigated using a semi-continuous reactor in aqueous solution. The results indicated that the combination of ozone (O3) and ZVZ showed an obvious synergetic effect, i.e. an improvement of 54.8% on DBP degradation was obtained by the O3/ZVZ process after 10min reaction compared to the cumulative effect of O3 alone and O2/ZVZ. The degradation efficiency of DBP increased gradually with the increase of ZVZ dosage, enhanced as solution pH increasing from 2.0 to 10.0, and more amount of DBP was degraded with the initial concentration of DBP arising from 0.5 to 2.0mgL(-1). Recycling use of ZVZ resulted in the enhancement of DBP degradation, because the newly formed zinc oxide took part in the reaction. The mechanism investigation demonstrated that the enhancement effect was attributed to the introduction of ZVZ, which could promote the utilization of O3, enhance the formation of superoxide radical by reducing O2 via one-electron transfer, accelerate the production of hydrogen peroxide and the generation of hydroxyl radical. Additionally, the newly formed zinc oxide on ZVZ surface also contributed to the enhancement of DBP degradation in the recycling use of ZVZ. Most importantly, the O3/ZVZ process was also effective in enhanced ozonation degradation of DBP under the background of actual waters.
authors: School of Environmental and Municipal Engineering, Xi'an University of Architecture and Technology, Xi'an 710050, People's Republic of China; State Key Laboratory of Urban Water Resource and Environment, Harbin Institute of Technology, Harbin 150090, People's Republic of China.
authors: Gang
authors: G
authors: Wen
authors: State Key Laboratory of Urban Water Resource and Environment, Harbin Institute of Technology, Harbin 150090, People's Republic of China; Beijing General Municipal Engineering Design and Research Institute, Beijing 100082, People's Republic of China.
authors: Sheng-Jun
authors: SJ
authors: Wang
authors: State Key Laboratory of Urban Water Resource and Environment, Harbin Institute of Technology, Harbin 150090, People's Republic of China. Electronic address: majun@hit.edu.cn.
authors: Jun
authors: J
authors: Ma
authors: School of Environmental and Municipal Engineering, Xi'an University of Architecture and Technology, Xi'an 710050, People's Republic of China.
authors: Ting-Lin
authors: TL
authors: Huang
authors: School of Environmental Science and Engineering, Huazhong University of Science and Technology, Wuhan 430074, People's Republic of China. Electronic address: liuzhengqian@gmail.com.
authors: Zheng-Qian
authors: ZQ
authors: Liu
authors: School of Civil Engineering, Harbin Institute of Technology, Harbin 150090, People's Republic of China.
authors: Lei
authors: L
authors: Zhao
authors: State Environmental Protection Key Laboratory of Microorganism Application and Risk Control (MARC), Tsinghua University, Beijing 100084, People's Republic of China.
authors: Jun-Feng
authors: JF
authors: Su
mesh_terms: D003993:Dibutyl Phthalate / Q000737:chemistry*; D016877:Oxidants / Q000737:chemistry*; D010126:Ozone / Q000737:chemistry*; D012996:Solutions; D013499:Surface Properties; D014874:Water Pollutants, Chemical / Q000737:chemistry*; D018508:Water Purification / Q000379:methods; D015032:Zinc / Q000737:chemistry*; D015034:Zinc Oxide / Q000737:chemistry; D020002:tert-Butyl Alcohol / Q000737:chemistry
chemical_list: D016877:Oxidants; D012996:Solutions; D014874:Water Pollutants, Chemical; D003993:Dibutyl Phthalate; D010126:Ozone; D015032:Zinc; D020002:tert-Butyl Alcohol; D015034:Zinc Oxide
keywords: Degradation mechanism; Di-n-butyl phthalate; Enhanced ozonation; Zero-valent zinc