Vivianite-induced peroxymonosulfate activation for containment removal under dark conditions: Performance, mechanism and regeneration

Qi Li; Mingzhou Wang; Jia-Qi Chen; Xiaomeng Liu; Jing Wang; Yang Mu

doi:10.1016/j.watres.2023.119729

Vivianite-induced peroxymonosulfate activation for containment removal under dark conditions: Performance, mechanism and regeneration

Water Res. 2023 Apr 15:233:119729. doi: 10.1016/j.watres.2023.119729. Epub 2023 Feb 13.

Authors

Qi Li¹, Mingzhou Wang¹, Jia-Qi Chen¹, Xiaomeng Liu², Jing Wang¹, Yang Mu³

Affiliations

¹ CAS Key Laboratory of Urban Pollutant Conversion, Department of Environmental Science and Engineering, University of Science and Technology of China, Hefei, China.
² CAS Key Laboratory of Urban Pollutant Conversion, Department of Environmental Science and Engineering, University of Science and Technology of China, Hefei, China. Electronic address: xiaomliu@ustc.edu.cn.
³ CAS Key Laboratory of Urban Pollutant Conversion, Department of Environmental Science and Engineering, University of Science and Technology of China, Hefei, China. Electronic address: yangmu@ustc.edu.cn.

PMID: 36801576
DOI: 10.1016/j.watres.2023.119729

Abstract

The performance and intrinsic mechanism of vivianite, a natural mineral containing structural Fe(II), for peroxymonosulfate (PMS) activation and pollutant degradation under dark conditions were comprehensively explored in this study. It was found that vivianite was able to efficiently activate PMS to degrade various pharmaceutical pollutants under dark conditions, in which the corresponding reaction rate constant of ciprofloxacin (CIP) degradation was 47- and 32-fold higher than that of magnetite and siderite, respectively. SO₄^·-, ^·OH, Fe(IV) and electron-transfer processes were found in the vivianite-PMS system, while SO₄^·- was the main contributor to CIP degradation. Moreover, mechanistic explorations revealed that the Fe site on the surface of vivianite could bind PMS in the form of a bridge position, and thus vivianite could rapidly activate absorbed PMS due to its strong electron-donating ability. Additionally, it was illustrated that the used vivianite could be efficiently regenerated by either chemical or biological reduction. This study may provide an alternative application of vivianite in addition to phosphorus recovery from wastewater.

Keywords: Peroxymonosulfate; Pollutant degradation; Regeneration; Vivianite.

MeSH terms

Ciprofloxacin
Ferrous Compounds*
Peroxides* / chemistry
Phosphates

Substances

peroxymonosulfate
ferrous phosphate
Peroxides
Ferrous Compounds
Phosphates
Ciprofloxacin