Enhancing peroxymonosulfate activation of Fe-Al layered double hydroxide by dissolved organic matter: Performance and mechanism

Quanyun Ye; Jiayan Wu; Pingxiao Wu; Jinxin Wang; Wenchao Niu; Shanshan Yang; Meiqing Chen; Saeed Rehman; Nengwu Zhu

doi:10.1016/j.watres.2020.116246

Enhancing peroxymonosulfate activation of Fe-Al layered double hydroxide by dissolved organic matter: Performance and mechanism

Water Res. 2020 Oct 15:185:116246. doi: 10.1016/j.watres.2020.116246. Epub 2020 Jul 27.

Authors

Quanyun Ye¹, Jiayan Wu¹, Pingxiao Wu², Jinxin Wang¹, Wenchao Niu¹, Shanshan Yang¹, Meiqing Chen¹, Saeed Rehman¹, Nengwu Zhu³

Affiliations

¹ School of Environment and Energy, South China University of Technology, Guangzhou Higher Education Mega Centre, Guangzhou 510006, PR China.
² School of Environment and Energy, South China University of Technology, Guangzhou Higher Education Mega Centre, Guangzhou 510006, PR China; The Key Lab of Pollution Control and Ecosystem Restoration in Industry Clusters, Ministry of Education, Guangzhou 510006, PR China; Guangdong Provincial Engineering and Technology Research Center for Environmental Risk Prevention and Emergency Disposal, South China University of Technology, Guangzhou Higher Education Mega Centre, Guangzhou 510006, PR China; Guangdong Provincial Key Laboratory of Solid Wastes Pollution Control and Recycling, Guangzhou 510006, PR China; Guangdong Engineering and Technology Research Center for Environmental Nanomaterials, Guangzhou 510006, PR China. Electronic address: pppxwu@scut.edu.cn.
³ School of Environment and Energy, South China University of Technology, Guangzhou Higher Education Mega Centre, Guangzhou 510006, PR China; The Key Lab of Pollution Control and Ecosystem Restoration in Industry Clusters, Ministry of Education, Guangzhou 510006, PR China.

PMID: 32739697
DOI: 10.1016/j.watres.2020.116246

Abstract

In this study, peroxymonosulfate (PMS) activation of FeAl layered double hydroxide (FeAl-LDH) was enhanced by compounding dissolved organic matter (DOM). The characterization and catalytic performance of FeAl-LDH and DOM-LDH were investigated. The results revealed that the physicochemical properties of DOM-LDH were superior to FeAl-LDH: (i) The higher proportion of Fe(II) was found in DOM-LDH, mainly existed in the form of trans-coordinated octahedral Fe(II); (ii) DOM-LDH showed a flower-like morphology with larger specific surface area, pore width and pore volume; (iii) More functional groups and surface oxygen vacancies were found in DOM-LDH. Moreover, DOM promoted the process of PMS activation by accelerating Fe(III) reduction with humic acid-like compounds. The results of electron paramagnetic resonance (EPR) and quenching experiments indicated that more reactive oxygen species (ROS) were generated in DOM-LDH/PMS system, •OH was considered as the dominant ROS for Bisphenol A (BPA) degradation. As a result, the degradation efficiency for BPA (20 mg L^-1) in FeAl-LDH/PMS system was increased from 60% to 93% within 60 min after the introduction of DOM. This work is expected to facilitate the design and application of Fe(II)/PMS system for environmental protection.

Keywords: Dissolved organic matter; Layered double hydroxide; Peroxymonosulfate.

MeSH terms

Catalysis
Ferric Compounds*
Hydroxides
Peroxides*

Substances

Ferric Compounds
Hydroxides
Peroxides
peroxymonosulfate