Adsorption of antimony(V) onto Mn(II)-enriched surfaces of manganese-oxide and Fe-Mn binary oxide

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	Adsorption of antimony(V) onto Mn(II)-enriched surfaces of manganese-oxide and Fe-Mn binary oxide
	Liu, Ruiping; Xu, Wei; He, Zan; Lan, Huachun; Liu, Huijuan; Qu, Jiuhui; Prasai, Tista
刊名	CHEMOSPHERE
	2015-11
卷号	138 期号:0 页码:616-624
关键词	Antimony(V) Mn-oxide K2SO3 reduction Mn2+ adsorption ATR-FTIR Mn2+-enriched surface
英文摘要	Manganese(IV) oxide [Mn(IV)] potentially oxidizes antimony(III) [Sb(III)] to antimony(V) [Sb(V)] and improves Sb removal by Fe-Mn binary oxide (FMBO) through an oxidation-adsorption mechanism. This study focused on the effect of Mn(IV) reductive dissolution by potassium sulfite (K2SO3) on Sb(V) adsorption onto manganese oxide (Mn-oxide) and FMBO. The maximum Sb(V) adsorption (Q(max,Sb(v))) increased from 1.0 to 1.1 mmol g(-1) for FMBO and from 0.4 to 0.6 mmol g(-1) for Mn-oxide after pretreatment with 10 mmol L-1 K2SO3. The addition of 2.5 mmol L-1 Mn2+ also significantly improved Sb(V) adsorption, and the observed Q(max,Sb(v)) increased to 1.4 and 1.0 mmol g(-1) for FMBO and Mn-oxide, respectively, with pre-adsorbed Mn2+. Neither K2SO3 nor Mn2+ addition had any effect on Sb(V) adsorption onto iron oxide (Fe-oxide). Mn2+ introduced by either Mn(IV) dissolution or addition tended to form outer-sphere surface complexes with hydroxyl groups on Mn-oxide surfaces (equivalent to MnOOH). Mn2+ at 2.5 mmol L-1 shifted the isoelectric point (pH(iep)) from 7.5 to 10.2 for FMBO and from 4.8 to 9.2 for Mn-oxide and hence benefited Sb(V) adsorption. The adsorption of Sb(V) onto Mn2+-enriched surfaces contributed to the release of Mn2+, and the X-ray photoelectron spectra also indicated increased binding energy of Mn 2p(3/2) after the adsorption of Sb(V) onto K2SO3-pretreated FMBO and Mn-oxide. Sb(V) adsorption involved the formation of inner-sphere complexes and contributed to the release of Mn2+. In the removal of Sb(III) by Mn-based oxides, the oxidation of Sb(III) to Sb(V) by Mn(IV) oxides had an effect; however, Mn(IV) dissolution and Mn2+-enrichment also played an important role. (C) 2015 Elsevier Ltd. All rights reserved.
研究领域[WOS]	Environmental Sciences
WOS记录号	WOS:000361772800082
公开日期	2016-03-15
内容类型	期刊论文
源URL	[http://ir.rcees.ac.cn/handle/311016/32720]
专题	生态环境研究中心_环境水质学国家重点实验室
推荐引用方式 GB/T 7714	Liu, Ruiping,Xu, Wei,He, Zan,et al. Adsorption of antimony(V) onto Mn(II)-enriched surfaces of manganese-oxide and Fe-Mn binary oxide[J]. CHEMOSPHERE,2015,138(0):616-624.
APA	Liu, Ruiping.,Xu, Wei.,He, Zan.,Lan, Huachun.,Liu, Huijuan.,...&Prasai, Tista.(2015).Adsorption of antimony(V) onto Mn(II)-enriched surfaces of manganese-oxide and Fe-Mn binary oxide.CHEMOSPHERE,138(0),616-624.
MLA	Liu, Ruiping,et al."Adsorption of antimony(V) onto Mn(II)-enriched surfaces of manganese-oxide and Fe-Mn binary oxide".CHEMOSPHERE 138.0(2015):616-624.