Singlet oxygen-dominated activation of peroxymonosulfate by passion fruit shell derived biochar for catalytic degradation of tetracycline through a non-radical oxidation pathway

被引:308
作者
Hu, Yi [1 ]
Chen, Dezhi [1 ]
Zhang, Rui [1 ]
Ding, Yuan [1 ]
Ren, Zhong [1 ]
Fu, Maosheng [1 ]
Cao, Xiukun [2 ]
Zeng, Guisheng [1 ]
机构
[1] Nanchang Hangkong Univ, Sch Environm & Chem Engn, Key Lab Jiangxi Prov Persistent Pollutants Contro, Natl Local Joint Engn Res Ctr Heavy Met Pollutant, Nanchang 330063, Jiangxi, Peoples R China
[2] JinChenBoKe Environm Dev Technol Co Ltd, Tianjin 300384, Peoples R China
基金
中国国家自然科学基金;
关键词
Peroxymonosulfate activation; Biochar; Non-radical pathway; Waste reuse; Tetracycline hydrochloride; WASTE-WATER TREATMENT; BISPHENOL-A; CARBON NANOTUBES; SLUDGE; NANOSTRUCTURES; 1,4-DIOXANE; MECHANISM; LIGHT;
D O I
10.1016/j.jhazmat.2021.126495
中图分类号
X [环境科学、安全科学];
学科分类号
08 ; 0830 ;
摘要
Waste-derived biochar has been emerged as promising catalysts to activate peroxymonosulfate (PMS) for the degradation of organic contaminants. Herein, passion fruit shell derived biochar (PFSC) was prepared by a onepot pyrolysis method and used as a metal-free catalyst to activate PMS for the degradation of tetracycline hydrochloride (TC). The batch experiments indicated that the pyrolysis temperature could influence the efficiency of PFSC for the activation of PMS. In the PFSC-900 (prepared at 900 degrees C)/PMS system, the degradation rate of TC can reach 90.91%. The quenching test and electron paramagnetic resonance spectra revealed that the high catalytic performance of PFSC-900/PMS system was mainly attributed to the non-free radical reaction pathway containing a carbon bridge, and the TC degradation was controlled primarily by singlet oxygen-mediated oxidation. Moreover, the carboxyl group of ketones and the graphite-N atoms on PFSC-900 are the possible active sites of the non-free radical pathway including direct electron transfer or the formation of O2 center dot-/1O2. This study not only shows a new type of biochar as an efficient catalyst for PMS activation but also provides a way of value-added reuse of passion fruit shell.
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页数:12
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