Citation: Chenghuan Qiao, Yaohua Wu, Yihong Chen, Chuchu Chen, Juanshan Du, Wenrui Jia, Yongqi Liang, Qinglian Wu, Huazhe Wang, Wan-Qian Guo. Chinese medicine residue-derived biochars for peracetic acid activation in sulfamethoxazole removal via non-radical pathways[J]. Chinese Chemical Letters, ;2026, 37(3): 111526. doi: 10.1016/j.cclet.2025.111526 shu

Chinese medicine residue-derived biochars for peracetic acid activation in sulfamethoxazole removal via non-radical pathways

State Key Laboratory of Urban-rural Water Resource and Environment, Harbin Institute of Technology, Harbin 150090, China

huazhewang@hit.edu.cn

Received Date: 21 December 2024
Revised Date: 6 May 2025
Accepted Date: 1 July 2025
Available Online: 2 July 2025

Figures(5)

According to the "New Coronavirus Pneumonia (COVID-19) Tenth Edition Diagnosis and Treatment Plan", residues from three prescriptions including Qingfei-Paidu Formula, Huashi-Baidu Formula, and Xuanfei-Zhixue Formula were selected as precursors for biochar preparation. The resulting Chinese medicine residue-derived biochars (CMR-BCs), prepared using different prescriptions and pyrolysis temperatures, were used to activate peracetic acid (PAA) for sulfamethoxazole (SMX) removal. Biochar (q800) produced from 800 ℃-treated Qingfei-Paidu Formula residue achieved ~60% SMX adsorption removal efficiency, outperforming other CMR-BCs. All prepared CMR-BC samples demonstrated oxidative degradation of SMX via activating PAA, with efficiencies ranging from ~20.8% to 45.5%, which might be ascribed to their abundant oxygen-containing functional groups and graphitic structures. Electro-chemical analysis and quenching tests indicated that the direct electron-transfer (DET) process was identified as the primary non-radical degradation mechanism. The formation of CMR-BCs-PAA* interfacial complexes enhanced the overall oxidation potential, facilitating the redox reaction between CMR-BCs-PAA* and SMX. In total, this study offers new insights into the non-radical mechanism of CMR-BC/PAA systems, presenting a potential solution for the resource utilization of Chinese medicine residue wastes.
- Peracetic acid,
- Chinese medicine residues,
- Biochar,
- Electron transfer process,
- Sulfamethoxazole
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