Insights into the activation of ozonation by hydroxylamine: Influential factors, degradation mechanism and reaction kinetics

Wenlei Qin; Xiangjuan Yuan; Lei Sun; Zhimin Qiang; Dongsheng Xia

doi:10.1016/j.jhazmat.2019.03.121

Insights into the activation of ozonation by hydroxylamine: Influential factors, degradation mechanism and reaction kinetics

J Hazard Mater. 2019 Jul 5:373:600-607. doi: 10.1016/j.jhazmat.2019.03.121. Epub 2019 Mar 29.

Authors

Wenlei Qin¹, Xiangjuan Yuan², Lei Sun¹, Zhimin Qiang³, Dongsheng Xia⁴

Affiliations

¹ School of Environmental Engineering, Wuhan Textile University, No.1 Sunshine Avenue, Wuhan, 430200, China.
² School of Environmental Engineering, Wuhan Textile University, No.1 Sunshine Avenue, Wuhan, 430200, China; Engineering Research Center for Clean Production of Textile Dyeing and Printing, Ministry of Education, No.1 Sunshine Avenue, Wuhan, 430200, China. Electronic address: yuanxiangjuan1986@outlook.com.
³ Key Laboratory of Drinking Water Science and Technology, Research Center for Eco-Environmental Sciences, Chinese Academy of Sciences, 18 Shuang-qing Road, Beijing, 100085, China.
⁴ School of Environmental Engineering, Wuhan Textile University, No.1 Sunshine Avenue, Wuhan, 430200, China; Engineering Research Center for Clean Production of Textile Dyeing and Printing, Ministry of Education, No.1 Sunshine Avenue, Wuhan, 430200, China. Electronic address: dongsheng_xia@wtu.edu.cn.

PMID: 30953977
DOI: 10.1016/j.jhazmat.2019.03.121

Abstract

The decontamination of prometon (PMT) by ozone/hydroxylamine hydrochloride (O₃/HAC) was systematically investigated in this study with focus on the degradation mechanism and kinetics. Experimental results revealed that there was an enhancement of PMT degradation efficiency by 42.1% and the pseudo-first-order rate constant by more than 5.7 times in O₃/HAC process under low HAC dosage (5 mg L^-1) after 3 min in comparison with O₃ alone. The second-order rate constant of PMT with hydroxyl radical (^•OH) was determined to be (1.84 ± 0.1) × 10⁹ M^-1 s^-1 and 7.80 × 10⁹ M^-1 s^-1 via competition kinetics and ^•OH steady-state hypothesis, respectively. The PMT removal in O₃/HAC process was highly pH-dependent and the optimum degradation performance was achieved under pH 5.0. In addition, ^•OH and singlet oxygen were identified as the primary reactive oxygen radicals in O₃/HAC process. Meanwhile, eleven transformation products of PMT were identified and possible degradation mechanisms were proposed. Moreover, a kinetic model based on chemical kinetics and steady-state hypothesis was developed and modified to predict the PMT abatement in O₃/HAC process. The results demonstrated that the O₃/HAC process provided a promising alternative for refractory organic pollutants decontamination in water treatment.

Keywords: Hydroxylamine hydrochloride; Kinetic model; Ozonation; Reaction mechanism; Transformation products.

Publication types

Research Support, Non-U.S. Gov't