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Ultrasound enhanced activation of peroxydisulfate by activated carbon fiber for decolorization of azo dye

Authors
  • Huang, Tianyin1
  • Zhang, Ke1
  • Qian, Yajie2
  • Fang, Cong1
  • Chen, Jiabin1, 3
  • 1 Suzhou University of Science and Technology, School of Environmental Science and Engineering, Suzhou, 215001, People’s Republic of China , Suzhou (China)
  • 2 Donghua University, College of Environmental Science and Engineering, Shanghai, 201620, People’s Republic of China , Shanghai (China)
  • 3 Xiamen Urban Water Environmental Eco-Planning and Remediation Engineering Research Center (XMERC), Xiamen, China , Xiamen (China)
Type
Published Article
Journal
Environmental Science and Pollution Research
Publisher
Springer-Verlag
Publication Date
Feb 20, 2018
Volume
25
Issue
15
Pages
14407–14414
Identifiers
DOI: 10.1007/s11356-018-1442-3
Source
Springer Nature
Keywords
License
Yellow

Abstract

Activated carbon fiber (ACF) has become an emerging activator for peroxydisulfate (PDS) to generate sulfate radical (SO4•−). However, the relative low activation efficiency and poor contaminant mineralization limited its widespread application. Herein, ultrasound (US) was introduced to the ACF activated PDS system, and the synergistic effect of US and ACF in PDS activation and the enhancement of contaminant mineralization were investigated. The synergistic effect of US and ACF was observed in the PDS activation to decolorize orange G (OG). The decolorization efficiency increased with increasing ACF loading and US power, and PDS/OG ratio from 1 to 40. The activation energy was determined to be 24.065 kJ/mol. The radical-induced decolorization of OG took place on the surface of ACF, and both SO4•− and hydroxyl radical (•OH) contributed to OG decolorization. The azo bond and naphthalene ring on OG were destructed to other aromatic intermediates and finally mineralized to CO2 and H2O. The introduction of US in the ACF/PDS system significantly enhanced the mineralization of OG. The combination of US and PDS was highly efficient to activate PDS to decolorize azo dyes. Moreover, the introduction of US remarkably improved the contaminant mineralization.

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