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Mechanistic insights into peracetic acid activation by iron-biochar composites prepared at low and high temperature for enhanced contaminant degradation: Selective reactive species generation

文献类型： 外文期刊

作者： Peng, Guilong 1 ; Yan, Yuting 1 ; Qi, Chengdu 3 ; Chen, Junhua 4 ; Meng, Xukun 1 ; Blaney, Lee 5 ; Gong, Wenwen 2 ;

作者机构： 1.Southwest Univ, Coll Sericulture Text & Biomass Sci, State Key Lab Resource Insects, Chongqing 400715, Peoples R China

2.Inst Qual Stand & Testing Technol, Beijing Acad Agr & Forestry Sci, Beijing 100097, Peoples R China

3.Nanjing Normal Univ, Jiangsu Prov Engn Res Ctr Environm Risk Prevent &, Sch Environm, Jiangsu Engn Lab Water & Soil Ecoremediat, Nanjing 210023, Peoples R China

4.Guizhou Med Univ, Sch Pharm, Guiyang 550025, Guizhou, Peoples R China

5.Univ Maryland Baltimore Cty, Dept Chem Biochem & Environm Engn, Baltimore, MD 21250 USA

关键词： Peracetic acid; Iron-biochar; Acetaminophen; Reactive species; Advanced oxidation

期刊名称：CHEMICAL ENGINEERING JOURNAL （ 影响因子：13.2； 五年影响因子：13.5 ）

ISSN： 1385-8947

年卷期： 2025 年 512 卷

页码：

收录情况： SCI

摘要： Iron-based activation of peracetic acid (PAA) is an environmentally friendly and low-cost technology for degrading contaminants. In this study, iron-biochar (Fe-BC) composites were prepared at low temperature (FeBC-300) and high temperature (Fe-BC-800) and used to activate PAA to degrade acetaminophen (ACT). In the FeBC-300/PAA process, Fe(IV) was the dominant reactive species responsible for ACT degradation; in contrast, center dot OH and RO center dot (e.g., CH3C(O)O center dot) were the dominant reactive species in the Fe-BC-800/PAA system. To elucidate the contributions of each reactive species, a mixed probes strategy designed for heterogeneous PAA activation systems was deployed (for the first time) to simultaneously determine the steady-state concentrations of Fe(IV), center dot OH, and RO center dot. The reaction mechanisms were confirmed by treating a suite of organic contaminants with variable ionization potential by the Fe-BC-300/PAA and Fe-BC-800/PAA systems. The experimental results, in combination with density functional theory calculations, confirmed the aforementioned roles of Fe(IV), center dot OH, and RO center dot in Fe-BC/PAA processes. Overall, the new mechanistic insights from this study inform preparation of Fe-BC composites for selective generation of specific reactive species upon PAA activation.

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