Chloride-enhanced degradation of micropollutants in natural water by the iron/biochar/peroxymonosulfate system: Role of iron(Ⅳ) and radicals

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外文摘要：The increased occurrence and concentration of micropollutants in water supplies raise public health concerns.Advanced oxidation of micropollutants in real water sources remains challenging due to scavenging reactionsinvolving background anions and natural organic matter. For the first time, this paper demonstrates that chloride(Cl–) accelerates the activation of peroxymonosulfate (PMS) by iron-biochar (Fe/BC) composites. Under thetested conditions, this novel system completely degraded bisphenol A (BPA), a representative micropollutant,within 1.0 min. Micropollutant degradation was investigated at different Cl– contents, PMS levels, Fe/BC doses,and solution pH. The primary reactive species involved with BPA degradation were iron(Ⅳ) (Fe(Ⅳ)), sulfateradical (SO_4•–), hydroxyl radical (•OH), and reactive chlorine species (Cl•, ClO•, Cl_2•–). The steady-state concentrationsof these reactive species were evaluated to determine their relationships to the Cl– and PMS contents. Fe(Ⅳ) was confirmed as the dominant reactive species, with Fe(Ⅳ) concentrations increasing with Cl– content and salinity to enhance the overall BPA degradation. Importantly, BPA degradation by the Fe/BC/PMS/Cl– system was not greatly affected by background anions or natural organic matter (NOM) present in real water sources, and the system was successfully applied for five sequential cycles of BPA treatment.

外文关键词：

Iron(Ⅳ)BiocharOxidationFerrateReactive chlorine species

作者：

Mengqiao Zhang、Wenwen Gong、Xiling Wang、Lee Blaney、Guilong Peng、Virender K. Sharma

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作者单位：

State Key Laboratory of Resource Insects, College of Sericulture, Textile and Biomass Sciences, Southwest University, Chongqing 400715, China||Institute of Quality Standard and Testing Technology, Beijing Academy of Agriculture and Forestry Science, Beijing 100097, China

Institute of Quality Standard and Testing Technology, Beijing Academy of Agriculture and Forestry Science, Beijing 100097, China

State Key Laboratory of Resource Insects, College of Sericulture, Textile and Biomass Sciences, Southwest University, Chongqing 400715, China

University of Maryland Baltimore County, Department of Chemical, Biochemical, and Environmental Engineering, Baltimore, MD 21250, USA

Department of Chemical, Environmental, and Materials Engineering, University of Miami, 1251 Memorial Drive, Miami, FL 33146, USA

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出版年：

2025

DOI：

10.1016/j.jhazmat.2025.137952

Journal of hazardous materials

SCI

ISSN：0304-3894

年,卷(期)：2025.492(Jul.15)