Facile synthesis of superparamagnetic β-CD-MnFe2O4 as a peroxymonosulfate activator for efficient removal of 2,4- dichlorophenol: structure, performance, and mechanism

Xiaojun Zhou; Lingshuai Kong; Zongyu Jing; Shuqing Wang; Yongchao Lai; Meng Xie; Long Ma; Zhenyu Feng; Jinhua Zhan

doi:10.1016/j.jhazmat.2020.122528

Facile synthesis of superparamagnetic β-CD-MnFe₂O₄ as a peroxymonosulfate activator for efficient removal of 2,4- dichlorophenol: structure, performance, and mechanism

J Hazard Mater. 2020 Jul 15:394:122528. doi: 10.1016/j.jhazmat.2020.122528. Epub 2020 Mar 12.

Authors

Xiaojun Zhou¹, Lingshuai Kong¹, Zongyu Jing¹, Shuqing Wang¹, Yongchao Lai², Meng Xie³, Long Ma⁴, Zhenyu Feng¹, Jinhua Zhan⁵

Affiliations

¹ Key Laboratory for Colloid & Interface Chemistry of Education Ministry, Department of Chemistry, Shandong University, Jinan 250100, PR China.
² Shandong Academy of Occupational Health and Occupational Medicine, Shandong First Medical University & Shandong Academy of Medical Sciences, Jinan 250062, PR China. Electronic address: suncedar@126.com.
³ Key Laboratory for Applied Technology of Sophisticated Analytical Instruments of Shandong Province, Analysis and Test Centre, Qilu University of Technology (Shandong Academy of Sciences), Jinan 250014, China.
⁴ The Testing Center of Shandong Bureau of China Metallurgical Geology Bureau, Jinan, 250100, PR China.
⁵ Key Laboratory for Colloid & Interface Chemistry of Education Ministry, Department of Chemistry, Shandong University, Jinan 250100, PR China. Electronic address: jhzhan@sdu.edu.cn.

PMID: 32200243
DOI: 10.1016/j.jhazmat.2020.122528

Abstract

In this study, superparamagnetic β-CD-MnFe₂O₄ with a large surface area was synthesized via a facile co-precipitation method, with β-cyclodextrin (β-CD) acting as a coating agent. The as-prepared β-CD-MnFe₂O₄ exhibited better catalytic performance than bare MnFe₂O₄ in terms of activating peroxymonosulfate (PMS) to degrade 2,4-dichlorophenol (2,4-DCP) over a broad pH range of 5-11. Electron spin resonance spectroscopy (ESR) and free radical quenching experiments indicate that various active species (SO₄^-/OH/O₂^-/¹O₂) are generated in the β-CD-MnFe₂O₄/PMS system and that pollutants trapped in the cyclodextrin cavity are quickly degraded. Various reaction parameters of the β-CD-MnFe₂O₄/PMS system and the stability of β-CD-MnFe₂O₄ were also investigated. The results indicate that β-CD-MnFe₂O₄ is promising for use in water purification owing to its excellent magnetic separation and recovery properties and good resistance to humic acid (HA).

Keywords: Cyclodextrin; Humic acid; Magnetic separation; MnFe(2)O(4); Peroxymonosulfate.

Publication types

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