Production of Hydroxyl radicals from oxygenation of simulated AMD due to CaCO3-induced pH increase

doi:10.1016/j.watres.2016.12.048

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	Production of Hydroxyl radicals from oxygenation of simulated AMD due to CaCO3-induced pH increase
	Zhu, J; Zhang, P; Yuan, SH; Liao, P; Qian, A; Liu, XX; Tong, M; Li, LN
刊名	WATER RESEARCH
	2017
卷号	111 期号:-页码:118-126
关键词	Acid-mine Drainage Zero-valent Iron Hydrogen-peroxide Heterogeneous Oxidation Molecular-oxygen Fenton Reaction Ferrous Iron Neutral Ph Fe(Ii) Oxidants
ISSN号	0043-1354
DOI	10.1016/j.watres.2016.12.048
文献子类	期刊论文
英文摘要	Many karst areas are impacted by acid mine drainage (AMD) which is characterized by low pH, high concentrations of dissolved Fe(II) and toxic contaminants. During the flow of AMD in karst areas, the increase in pH facilitates the oxygenation of Fe(II). Whereas, the oxidizing capacity for Fe(II) oxygenation in AMD is poorly understood. In light of the recent finding that hydroxyl radicals ((OH)-O-center dot) can be produced from Fe(II) oxygenation, this study experimentally measured the cumulative concentrations of (OH)-O-center dot produced from oxygenation of simulated AMD (8.93 mM Fe2+, pH 3) in the presence of limestone (CaCO3). With the increase in CaCO3 dosages from 0.67 to 2.78 g/L, Fe(II) oxidation rate increased accordingly, but the maximum concentration of cumulative (OH)-O-center dot appeared at the CaCO3 dosage of 1.39 g/L, being 59.3 mu M within 24 h. The production of (OH)-O-center dot was mainly attributed to the rise of AMD pH due to dissolution of limestone; rendering the appearance of adsorbed Fe(II) on the newly formed lepidocrocite and ferrihydrite and complexed Fe2+ by carbonate (i.e., siderite). Oxygenation of these Fe(II) species was accountable for the production of (OH)-O-center dot. An appropriate pH (i.e., 5-6) was required for the moderate rate of Fe(II) oxidation, corresponding to the maximum production of (OH)-O-center dot. The (OH)-O-center dot produced from AMD oxygenation can concurrently oxidize the contaminants of arsenic and p-aminobenzenesulfonamide. Findings from this study suggest that the oxidizing impact of (OH)-O-center dot on contaminants transformation as well as organic carbon mineralization should be concerned for the oxygenation of AMD in karst areas. (C) 2017 Elsevier Ltd. All rights reserved.
WOS关键词	ACID-MINE DRAINAGE ; ZERO-VALENT IRON ; HYDROGEN-PEROXIDE ; HETEROGENEOUS OXIDATION ; MOLECULAR-OXYGEN ; FENTON REACTION ; FERROUS IRON ; NEUTRAL PH ; FE(II) ; OXIDANTS
语种	英语
WOS记录号	WOS:000395218900014
内容类型	期刊论文
源URL	[http://ir.sinap.ac.cn/handle/331007/28783]
专题	上海应用物理研究所_中科院上海应用物理研究所2011-2017年
推荐引用方式 GB/T 7714	Zhu, J,Zhang, P,Yuan, SH,et al. Production of Hydroxyl radicals from oxygenation of simulated AMD due to CaCO3-induced pH increase[J]. WATER RESEARCH,2017,111(-):118-126.
APA	Zhu, J.,Zhang, P.,Yuan, SH.,Liao, P.,Qian, A.,...&Li, LN.(2017).Production of Hydroxyl radicals from oxygenation of simulated AMD due to CaCO3-induced pH increase.WATER RESEARCH,111(-),118-126.
MLA	Zhu, J,et al."Production of Hydroxyl radicals from oxygenation of simulated AMD due to CaCO3-induced pH increase".WATER RESEARCH 111.-(2017):118-126.