Comparative study on heterogeneous activation of peroxydisulfate and peroxymonosulfate with black carbon derived from coal tar residues: Contribution of free radical, 1O2 and surface-bound radicals

Shiqi Tian; Yulei Liu; Yunpeng Wang; Jingyao Qi; Liquan Tian; Jun Ma; Gang Wen; Lu Wang

doi:10.1016/j.jhazmat.2022.128819

Comparative study on heterogeneous activation of peroxydisulfate and peroxymonosulfate with black carbon derived from coal tar residues: Contribution of free radical, ¹O₂ and surface-bound radicals

J Hazard Mater. 2022 Jul 5:433:128819. doi: 10.1016/j.jhazmat.2022.128819. Epub 2022 Mar 31.

Authors

Shiqi Tian¹, Yulei Liu², Yunpeng Wang², Jingyao Qi², Liquan Tian³, Jun Ma², Gang Wen⁴, Lu Wang⁵

Affiliations

¹ Key Laboratory of Northwest Water Resource, Environment and Ecology, MOE, Xi'an University of Architecture and Technology, Xi'an 710055, PR China; Shaanxi Key Laboratory of Environmental Engineering, Xi'an University of Architecture and Technology, Xi'an 710055, PR China.
² State Key Laboratory of Urban Water Resource and Environment, School of Environment, Harbin Institute of Technology, Harbin 150090, China.
³ Hebei Safety Technology Center for Radiation Environment, Shijiazhuang 050051, PR China.
⁴ Key Laboratory of Northwest Water Resource, Environment and Ecology, MOE, Xi'an University of Architecture and Technology, Xi'an 710055, PR China; Shaanxi Key Laboratory of Environmental Engineering, Xi'an University of Architecture and Technology, Xi'an 710055, PR China. Electronic address: wengang@xauat.edu.cn.
⁵ State Key Laboratory of Urban Water Resource and Environment, School of Environment, Harbin Institute of Technology, Harbin 150090, China. Electronic address: walyl9195@hit.edu.cn.

PMID: 35381510
DOI: 10.1016/j.jhazmat.2022.128819

Abstract

Carbon materials draw increasing attention as metal-free catalysts for persulfates activation. Herein, the potential of black carbon (BC) derived from coal tar residues on heterogeneous activation of peroxydisulfate (PDS) and peroxymonosulfate (PMS) to eliminate organic pollutants was investigated. Compared with UV/persulfates systems, persulfates/BC systems degraded 3 selected phenolic compounds (i.e. phenol, 4-chlorophenol (4-CP) and bisphenol A (BPA)) with an order of magnitude higher oxidation rates, and removed dissolved organics (DOC) with over 27% higher efficiency. In the PDS/BC system, ¹O₂ and surface-bound radicals were proved to be the dominant active species, while free radicals, ¹O₂, and surface-bound radicals were responsible for organics oxidation in the PMS/BC system. Relative contribution of different reactive species in persulfates/BC systems was pH-dependent. Surface oxygen functionalities of BC were involved in ¹O₂ generation, and its structural defects played a critical role in forming free radicals and surface-bound radicals. This study provided an in-depth insight into carbon-driven persulfates activation processes.

Keywords: Black carbon; Multiple reactive species; Peroxydisulfate; Peroxymonosulfate; Phenolic compounds.