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Degradation of 2,4-dichlorophenol contaminated soil by ultrasound-enhanced laccase.

Authors
  • Zhuang, Mengjuan1, 2
  • Ren, Dajun1, 2
  • Guo, Huiwen1, 2
  • Wang, Zhaobo1, 2
  • Zhang, Shuqin1, 2
  • Zhang, Xiaoqing1, 2
  • Gong, Xiangyi1, 2
  • 1 College of Resources and Environmental Engineering, Wuhan University of Science and Technology, Hubei, People's Republic of China. , (China)
  • 2 Hubei Key Laboratory for Efficient Utilization and Agglomeration of metallurgic Mineral Resources, Hubei, People's Republic of China. , (China)
Type
Published Article
Journal
Environmental Technology
Publisher
Informa UK (Taylor & Francis)
Publication Date
Apr 01, 2021
Volume
42
Issue
9
Pages
1428–1437
Identifiers
DOI: 10.1080/09593330.2019.1669723
PMID: 31530251
Source
Medline
Keywords
Language
English
License
Unknown

Abstract

In this paper, ultrasound was used to enhance the degradation effect of laccase for 2,4-dichlorophenol (2,4-DCP) in soil. The degradation effect and mechanism of the ultrasound-enhanced laccase were investigated. From the results, the degradation rate of 2,4-DCP can reach as high as 51.7% under the following conditions: reaction period was 21 h, pH = 5.5, ultrasound power was 240 W, duty cycle was 50%, and moisture content was 50%. Using the ultrasound-enhanced laccase, the degradation rate of 2,4-DCP was significantly higher than that using only laccase or only ultrasound. In addition, when ultrasound was used, the optimum pH for the degradation of 2,4-DCP using laccase was increased, making the degradation technology more practical. The analysis results from high-performance liquid chromatography (HPLC) and gas chromatography-mass spectrometry (GC-MS) revealed the degradation pathway of 2,4-DCP in soil: first, 2,4-DCP gradually became phenol through dechlorination, then the small molecular organic matter was generated from the hydroxyl radical or laccase reaction.

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