文献类型：期刊文献

英文题名：Biochar-modified zero-valent aluminum/Fe-containing clay composite activates peroxymonosulfate for 4-chlorophenol degradation: Enhancement of electron transfer rate for Fe(II)/Fe(III) cycle

作者：Yang, Ran[1] Zhu, Jinwei[1] Guo, Qi[1] Yang, Qi[1] Ding, Laibao[1]

第一作者：Yang, Ran

通信作者：Ding, LB[1]

机构：[1]Chinese Acad Forestry, Coinnovat Ctr Efficient Proc & Utilizat Forest Res, Key Lab Biomass Energy Mat Jiangsu Prov,Natl Fores, Key Lab Chem Engn Forest Prod,Inst Chem Ind Forest, Nanjing 210042, Peoples R China

年份：2025

卷号：362

外文期刊名：SEPARATION AND PURIFICATION TECHNOLOGY

收录：;EI(收录号：20250417764532);Scopus(收录号：2-s2.0-85215959538);WOS:【SCI-EXPANDED(收录号:WOS:001413532900001)】；

基金：This work was supported by Jiangsu Key Laboratory for Biomass Energy and Material (JSBEM-S-202207) and the Fundamental Research Funds of Research Institute of CAF (CAFYBB2023MA023) .

语种：英文

外文关键词：Zero-valent aluminum; Biochar; Peroxymonosulfate activation; Fe(II)/Fe(III) cycle; Catalytic oxidation

摘要：Zero-valent aluminum (ZVAl) has received increasing attention as promising activator for persulfate with extremely low redox potential. However, the dense oxide film of ZVAl impedes electron release and decreases its catalytic activity. In this work, a highly active ZVAl-based composite catalyst ZVAl-BC-FeATP for peroxymonosulfate (PMS) activation was prepared through construction of electron transfer channel by ball milling with pyrolytic biochar (BC) and Fe-saturated clay (FeATP). The optimal material, ZVAl-BC700-FeATP, was obtained at a ZVAl/FeATP mass ratio of 1:1 with addition of 40 % BC(wt) prepared at pyrolysis temperature of 700 degrees C degrees C, which could remove more than 95 % of the model pollutant 4-chlorophenol within 30 min. Ball milling process caused fracture of ZVAl powder and release of electron, addition of BC700 could enhance the dispersibility of composite particles and promote electron transfer from core of ZVAl to regenerate active Fe(II) sites for effective PMS activation, thereby improving the overall catalytic efficiency. The graphite-like structure generated at a relative high pyrolysis temperature in BC700 might acted as the main electron mediator. Moreover, quenching experiments and electron paramagnetic resonance (EPR) analysis indicated that both free radicals (SO center dot 4 , center dot OH, O center dot 2 ) and non-free radicals (1O2) contributed to 4-CP oxidation, with the free radical pathway playing a major role. The ZVAl-BC700-FeATP/PMS system presented good resistance for interferences of natural organic matter and some anions. This study provided a new strategy to alleviate the restraint of electron transfer brought by oxide film of ZVAl and make most of its strong reducibility in environmental remediation.