Activation of persulfates by natural magnetic pyrrhotite for water   disinfection: Efficiency, mechanisms, and stability

doi:10.1016/j.watres.2017.01.052

CORC > 北京大学 > 地球与空间科学学院

	Activation of persulfates by natural magnetic pyrrhotite for water disinfection: Efficiency, mechanisms, and stability
	Xia, Dehua ; Li, Yan ; Huang, Guocheng ; Yin, Ran ; An, Taicheng ; Li, Guiying ; Zhao, Huijun ; Lu, Anhuai ; Wong, Po Keung
刊名	WATER RESEARCH
	2017
关键词	Natural pyrrhotite Persulfate Sulfate radical Water disinfection Heterogeneous catalysis URBAN WASTE-WATER DRIVEN PHOTOCATALYTIC INACTIVATION VISIBLE-LIGHT IRRADIATION ESCHERICHIA-COLI HETEROGENEOUS ACTIVATION BACTERIAL INACTIVATION ORGANIC POLLUTANTS HYDROGEN-PEROXIDE SULFATE RADICALS TREATMENT PLANTS
DOI	10.1016/j.watres.2017.01.052
英文摘要	This study introduces natural occurring magnetic pyrrhotite (NP) as an environmentally friendly, easy available, and cost-effective alternative catalyst to activate persulfate (PS) of controlling microbial water contaminants. The E. coli K-12 inactivation kinetics observed in batch experiments was well described with first-order reaction. The optimum inactivation rate (k = 0.47 log/min) attained at a NP dose of 1 g/l. and a PS dose of 1 mM, corresponding to total inactivation of 7 log(10) cfu/mL cells within 15 min. Measured k increased > 2-fold when temperature increased from 20 to 50 degrees C; and > 4-fold when pH decreased from 9 to 3. Aerobic conditions were more beneficial to cell inactivation than anaerobic conditions due to more reactive oxygen species (ROS) generated. ROS responsible for the inactivation were identified to be (SO4-)-S-center dot > (OH)-O-center dot > H2O2 based on a positive scavenging test and in situ ROS determinationin situ characterization suggested that PS effectively bind to NP surface was likely to form charge transfer complex ( fe(II)center dot center dot center dot O3SO-OSO3-), which mediated ROS generation and E. coli K-12 oxidation. The increased cell-envelope lesions consequently aggravated intracellular protein depletion and genome damage to cause definite bacterial death. The NP still maintained good physiochemical structure and stable activity even after 4 cycle. Moreover, NP/PS system also exhibited good E. colt K-12 inactivation efficiency in authentic water matrices like surface water and effluents of secondary wastewater. (C) 2017 Elsevier Ltd. All rights reserved.; Research Grant Council, Hong Kong SAR Government [GRF14100115]; Technology and Business Development Fund of The Chinese University of Hong Kong [TBF15SCI008]; National Science Foundation of China [41573086, 41425015, 41603097]; CAS/SAFEA International Partnership Program for Creative Research Teams of Chinese Academy of Sciences; SCI(E); ARTICLE; 236-247; 112
语种	英语
内容类型	期刊论文
源URL	[http://ir.pku.edu.cn/handle/20.500.11897/474409]
专题	地球与空间科学学院
推荐引用方式 GB/T 7714	Xia, Dehua,Li, Yan,Huang, Guocheng,et al. Activation of persulfates by natural magnetic pyrrhotite for water disinfection: Efficiency, mechanisms, and stability[J]. WATER RESEARCH,2017.
APA	Xia, Dehua.,Li, Yan.,Huang, Guocheng.,Yin, Ran.,An, Taicheng.,...&Wong, Po Keung.(2017).Activation of persulfates by natural magnetic pyrrhotite for water disinfection: Efficiency, mechanisms, and stability.WATER RESEARCH.
MLA	Xia, Dehua,et al."Activation of persulfates by natural magnetic pyrrhotite for water disinfection: Efficiency, mechanisms, and stability".WATER RESEARCH (2017).