标题: Insight into the efficacy and mechanism of persulfate activation using KHCO3 modified biochar: The overlooked contribution of adsorption

作者: Yue, XT (Yue, Xiting); Chen, XT (Chen, Xuantong); Kang, J (Kang, Jin); Xu, Y (Xu, Yin); Zhang, H (Zhang, Hui)

来源出版物: CHEMICAL ENGINEERING JOURNAL 卷: 516 文献号: 163781 DOI: 10.1016/j.cej.2025.163781 Published Date: 2025 JUL 15

摘要: The annual production of waste herbal residue is substantial, and converting it into biochar for peroxydisulfate (PDS) activation to degrade emerging contaminants provides a promising approach for resource utilization. Whereas, the contribution of adsorption was frequently overlooked in this process. To address this issue, a family of KHCO3 chemically modified waste-herb-derived biochars were prepared and KWBC-2 with KHCO3 to waste herb residue mass ratio of 2 : 1 shows an excellent adsorption and PDS activation performance. The adsorptive removal of bisphenol A (BPA) reached 97.0% in 30 min at 0.3 g/L KWBC-2. By coupling with 1.0 mM PDS, the apparent removal of BPA increased to 98.3%, from which 95.3% of oxidative removal was distinguished. The BPA apparent removal is highly dependent on its liquid-solid mass transfer behavior with R2 = 0.96. C-OH is identified as adsorption site of reactant (BPA or PDS) and active site for PDS activation by correlating the functional group content of biochar with mass transfer coefficient of reactant or oxidative removal of BPA. The KWBC-2/PDS system is dominated by electron transfer pathway and shows good tolerance to different water matrices. Its performance deteriorated to 45.5% after three cycles, which could be largely recovered after thermal treatment, due to the complete regeneration of adsorption ability (96.7%) and the partial restoration of catalytic activity (70.9%). This study deepens the fundamental understanding on the adsorption and electron-transfer pathway in biochar activated persulfate advanced oxidation process.

作者关键词: Electron transfer process; Liquid-solid mass transfer; Peroxydisulfate; Emerging contaminants; Waste-herb-derived biochar

KeyWords Plus: EMERGING CONTAMINANTS; OXIDATION; DEGRADATION; CATALYSTS; GRAPHENE; CARBON; PEROXYMONOSULFATE; MORPHOLOGY; DESIGN

地址: [Yue, Xiting; Chen, Xuantong; Kang, Jin; Zhang, Hui] Wuhan Univ, Sch Resource & Environm Sci, Dept Environm Sci & Engn, Wuhan 430079, Peoples R China.

[Xu, Yin] Hubei Univ, Fac Resources & Environm Sci, Hubei Key Lab Reg Dev & Environm Response, Wuhan 430062, Peoples R China.

通讯作者地址: Zhang, H (通讯作者)，Wuhan Univ, Sch Resource & Environm Sci, Dept Environm Sci & Engn, Wuhan 430079, Peoples R China.

Xu, Y (通讯作者)，Hubei Univ, Fac Resources & Environm Sci, Hubei Key Lab Reg Dev & Environm Response, Wuhan 430062, Peoples R China.

电子邮件地址: yxu@hubu.edu.cn; eeng@whu.edu.cn

影响因子：13.2