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Environmental Science and Pollution Research

, Volume 25, Issue 26, pp 26394–26404 | Cite as

Enhanced degradation of isoproturon in soil through persulfate activation by Fe-based layered double hydroxide: different reactive species comparing with activation by homogenous Fe(II)

  • Yong Liu
  • Jie Lang
  • Ting Wang
  • Ali Jawad
  • Haibin Wang
  • Aimal Khan
  • Zhulei Chen
  • Zhuqi Chen
Research Article
  • 141 Downloads

Abstract

Phenylurea herbicide residuals in soil may continuously contaminate surface water and groundwater due to unregulated and improper use. Herein, we reported a stable and active oxidation system including heterogeneous Fe-based layered double hydroxide materials as persulfate (PS) activators. Under mild conditions, 1% LDH in weight and 70 mM PS can completely degrade 500 mg/kg isoproturon in soil within 10 h, during which less than 0.1 ppm heavy metal leaching was detected. This remarkable performance was consistent in a broad pH range (3~11) and was resistant to various inorganic anions (Cl, Br, NO3, HCO3) and humic acid. Mechanism studies from scavenging tests, EPR, and fluorescence spectra collectively proved that besides •OH and •SO4, singlet oxygen (1O2) and superoxide (•O2) were also generated and were accounted for the oxidative degradation. This unique mechanism of generating diverse radicals was clearly distinguished from classic Fe(II)/PS system, significantly reduced the influence of varying parameters in water and soil matrix, and was suggestive to chemical oxidation system in soil remediation to avoid scavenging effects by background electrolytes or other components in water/soil matrix.

Graphical abstract

Keywords

Persulfate PS activation Herbicide Soil remediation Leaching Singlet oxygen 

Notes

Acknowledgements

The authors thank the Analytical and Testing Center of Huazhong University of Science and Technology for help in XRD, FTIR, SEM, and XPS analyses.

Funding information

This project was funded by the National Natural Science Foundation of China (No. 21671072), Chutian Scholar Foundation from Hubei province, and Shenzhen Science and Technology Development Funds (No. JCYJ20160429182628979).

Supplementary material

11356_2018_2637_MOESM1_ESM.docx (1.1 mb)
ESM 1 (DOCX 1163 kb)

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Copyright information

© Springer-Verlag GmbH Germany, part of Springer Nature 2018

Authors and Affiliations

  1. 1.School of Environmental Science and EngineeringHuazhong University of Science and TechnologyWuhanPeople’s Republic of China
  2. 2.Key Laboratory of Material Chemistry for Energy Conversion and Storage, Ministry of Education, Hubei Key Laboratory of Material Chemistry and Service Failure, School of Chemistry and Chemical EngineeringHuazhong University of Science and TechnologyWuhanPeople’s Republic of China

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