Comparative analysis of biochar activated peroxymonosulfate and persulfate degradation of tetracycline
YANG Meng-xin1,2, WANG Ya-jing1,2, LIU Wen-jia2,3, HU Guang-zhi4, WU Xin-yao1,2, LIU Yan-fang1,2, ZHANG Lei1,2
1. College of Environmental Science and Engineering, Hebei University of Science and Technology, Shijiazhuang 050018, China; 2. Hebei Key Laboratory of Pollution Prevention Biotechnology, Shijiazhuang 050018, China; 3. School of Civil Engineering and Architecture, Hebei University of Science and Technology, Shijiazhuang 050018, China; 4. School of Chemical Science and Engineering, Yunnan University, Kunming 650091, China
Abstract：Corn straw biochar (Y-BC) was prepared by high-temperature pyrolysis method and its structure and morphology properties were characterized with a series of analytical techniques. The effects of initial pH and co-existing ions on tetracycline (TC) removal by Y-BC activated two types of persulfates: peroxydisulfate (PDS) and peroxymonosulfate (PMS) were systematically compared. The results showed that Y-BC activated PDS system could effectively remove TC under acidic and neutral conditions (pH=3~7), and TC removal efficiency was between 69.0% to 75.7% in 60min, while alkaline conditions (pH=9~11) TC removal efficiency reduced to 47.8%~48.4%. In contrast, the Y-BC-activated PMS system demonstrated a broad pH range for TC removal, and TC removal efficiency stabilized at 80.9%~86.8% at initial pH 3~11. The Cl- and NO3- anions exhibited negligible effects on both activated persulfate systems. Meanwhile, HCO3- showed an inhibitory effect on TC removal by the Y-BC-activated PDS system while promoting the effect by the Y-BC-activated PMS system. TC removal efficiency decreased by 7.6% and increased by 5.1% with Y-BC-activated PDS and PMS, respectively. Combined the results of X-ray photoelectron spectroscopy, quenching experiments, and electron paramagnetic resonance analysis, it was deduced that the primary active sites for Y-BC activated PDS system were defect structures, and TC degradation was mainly through singlet oxygen (1O2) generation and electron transfer mechanisms. Conversely, functional groups served as key active sites for the Y-BC-activated PMS system, and TC degradation was primarily via hydroxyl radical (·OH) formation.
杨梦鑫, 王亚静, 刘文佳, 胡广志, 武新耀, 刘艳芳, 张磊. 生物炭活化两种过硫酸盐降解四环素比较分析[J]. 中国环境科学, 2025, 45(2): 810-819.
YANG Meng-xin, WANG Ya-jing, LIU Wen-jia, HU Guang-zhi, WU Xin-yao, LIU Yan-fang, ZHANG Lei. Comparative analysis of biochar activated peroxymonosulfate and persulfate degradation of tetracycline. CHINA ENVIRONMENTAL SCIENCECE, 2025, 45(2): 810-819.
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