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	Activation of persulfate by swine bone derived biochar: Insight into the specific role of different active sites and the toxicity of acetaminophen degradation pathways
	Zhou, Xuerong1,3; Lai, Cui1; Liu, Shiyu1; Li, Bisheng1; Qin, Lei1; Liu, Xigui1; Yi, Huan1; Fu, Yukui1; Li, Ling1; Zhang, Mingming1
	2022-02-10
摘要	Recently, persulfate (PS) activation system has grown up as a primary branch of advanced oxidation processes, and biochar has been recognized as a potential nonmetal material in this field. However, few studies have focused on the corresponding relationship between actives sites on biochar and active species in AOPs. To pave this way, similar biochar (obtained from different pyrolysis temperature) with different functional structures were involved. In this study, biochar derived from swine bone (BBC) was applied in PS activation system to degrade acetaminophen (ACT). The results showed that both radical and non-radical pathway worked in the PS/BBCs systems, and the degradation rate (from 0.1042 to 0.4364 min(-1)) climbed with the increase of pyrolysis temperature (from 700 to 900 degrees C). To probe into the corresponding relationship between functional structure and active species, the effect of pyrolysis temperature on functional structure was analyzed. It came out that 1) defects could act as active sites for various active species; 2) persistent free radicals could do favor to the generation of O-1(2) and O-2 center dot(-) ; 3) hydroxyapatite in swine bone only served as hard templet for the porous structure. ACT degradation process was measured by Liquid chromatograph-mass spectrometer, and Scendesmus obliquus was applied to investigate the toxicity of PS/BBCs system. It illustrated that the existence of SO4 center dot(-) mainly contributed to the generation of high toxic intermediates (such as biphenyl and diphenyl ether) in the PS/BBCs system. Furthermore, the enhancement of adsorption capacity would mitigate the toxicity of PS/BBCs systems to some extent. (C) 2021 Elsevier B.V. All rights reserved.
关键词	Biochar Catalysis Intermediates Toxicity Persulfate activation system
DOI	10.1016/j.scitotenv.2021.151059
发表期刊	SCIENCE OF THE TOTAL ENVIRONMENT
ISSN	0048-9697
卷号	807页码:10
通讯作者	Chen, Ming(chenming@cigit.ac.cn) ; Zeng, Guangming(zgming@hnu.edu.cn)
收录类别	SCI
WOS记录号	WOS:000740212500001
语种	英语