Performance of UV/acetylacetone process for saline dye wastewater treatment: Kinetics and mechanism

Fei Yang; Bo Sheng; Zhaohui Wang; Ying Xue; Jianshe Liu; Tianyi Ma; Richard Bush; Hrvoje Kušić; Yanbo Zhou

doi:10.1016/j.jhazmat.2020.124774

Performance of UV/acetylacetone process for saline dye wastewater treatment: Kinetics and mechanism

J Hazard Mater. 2021 Mar 15:406:124774. doi: 10.1016/j.jhazmat.2020.124774. Epub 2020 Dec 5.

Authors

Fei Yang¹, Bo Sheng², Zhaohui Wang³, Ying Xue¹, Jianshe Liu⁴, Tianyi Ma⁵, Richard Bush⁶, Hrvoje Kušić⁷, Yanbo Zhou⁸

Affiliations

¹ State Environmental Protection Engineering Center for Pollution Treatment and Control in Textile Industry, College of Environmental Science and Engineering, Donghua University, Shanghai 201620, China; School of Environmental and Life Sciences, The University of Newcastle, Callaghan, NSW, 2308, Australia.
² State Environmental Protection Engineering Center for Pollution Treatment and Control in Textile Industry, College of Environmental Science and Engineering, Donghua University, Shanghai 201620, China.
³ State Environmental Protection Engineering Center for Pollution Treatment and Control in Textile Industry, College of Environmental Science and Engineering, Donghua University, Shanghai 201620, China; Shanghai Key Lab for Urban Ecological Processes and Eco-Restoration, School of Ecological and Environmental Sciences, East China Normal University, Shanghai 200241, China; Technology Innovation Center for Land Spatial Eco-restoration in Metropolitan Area, Ministry of Natural Resources, 3663 N. Zhongshan Road, Shanghai 200062, China; Shanghai Engineering Research Center of Biotransformation of Organic Solid Waste, Shanghai 200241, China. Electronic address: zhwang@des.ecnu.edu.cn.
⁴ State Environmental Protection Engineering Center for Pollution Treatment and Control in Textile Industry, College of Environmental Science and Engineering, Donghua University, Shanghai 201620, China; Shanghai Institute of Pollution Control and Ecological Security, Shanghai 200092, China.
⁵ School of Environmental and Life Sciences, The University of Newcastle, Callaghan, NSW, 2308, Australia.
⁶ Sustainable Development Institute, Monash University, Melbourne, Victoria 3800, Australia.
⁷ Faculty of Chemical Engineering and Technology, University of Zagreb, 10000 Zagreb, Croatia.
⁸ Shanghai Engineering Research Center of Biotransformation of Organic Solid Waste, Shanghai 200241, China; State Environmental Protection Key Laboratory of Environmental Risk Assessment and Control on Chemical Process, East China University of Science and Technology, Shanghai 200237, China.

PMID: 33310333
DOI: 10.1016/j.jhazmat.2020.124774

Abstract

Futility of traditional advanced oxidation processes (AOPs) in saline wastewater treatment has stimulated the quest for novel "halotolerant" chemical oxidation technology. Acetylacetone (AA) has proven to be a potent photo-activator in the degradation of dyes, but the applicability of UV/AA for saline wastewater treatment needs to be verified. In this study, degradation of crystal violet (CV) was investigated in the UV/AA system in the presence of various concentrations of exogenic Cl^- or Br^-. The results reveal that degradation, mineralization and even accumulation of adsorbable organic halides (AOX) were not significantly affected by the addition of Cl^- or Br^-. Rates of CV degradation were enhanced by elevating either AA dosage or solution acidity. An apparent kinetic rate equation was developed as r = -d[CV]/dt = k[CV]^a[AA]^b = (7.34 × 10^-4 mM^1-(a+b) min^-1) × [CV]^a=0.16 [AA]^b=0.97. In terms of results of radical quenching experiments, direct electron/energy transfer is considered as the major reaction mechanism, while either singlet oxygen or triplet state (³(AA)*) might be involved. Based on identification of degradation byproducts, a possible degradation pathway of CV in the UV/AA system is proposed.

Keywords: AOX formation; Degradation pathway; Mineralization; Reaction orders; Singlet oxygen.

Publication types

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