Effects of Mn average oxidation state on the oxidation behaviors of As(III) and Cr(III) by vernadite

doi:10.1016/j.apgeochem.2018.05.002

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	Effects of Mn average oxidation state on the oxidation behaviors of As(III) and Cr(III) by vernadite
	Zhang, S; Chen, SF; Liu, F; Li, JS; Liang, XL; Chu, SQ; Xiang, QJ; Huang, CQ; Yin, H; Chu SQ(储胜启)
	2018
发表期刊	APPLIED GEOCHEMISTRY (IF:2.581[JCR-2016],2.671[5-Year])
ISSN	0883-2927
卷号	94 页码:35-45
文章类型	Article
摘要	Vernadite is a poorly crystalline phyllomanganate that widely distributed in natural environments, and plays a pivotal role in the geochemical transformations of heavy metal and other pollutants. Though many works have done about the reaction mechanisms between vernadite-like minerals and As(III)/Cr(III), the effects of some basic structure characteristics of the mineral, such as Mn average oxidation state (AOS), on the oxidation of As (III)/Cr(III) are not fully understood. In this study, vernadite samples with different Mn AOSs but almost the same particle sizes (Ver and Ver20) were synthesized, characterized, and their reactivities towards As(III)/Cr(III) oxidation and As(V)/Cr(VI) adsorption were compared. It is found that Ver and Ver20 have almost the same point of zero charge (PZC), but ver20 has increased contents of layer Mn(III) at particle edges and interlayer Mn (III) and Mn(II), thus greatly reduced Mn AOS. Decrease in Mn AOS greatly reduces the oxidation capacity and initial reaction rate (K-obs) of this mineral towards As(III) on mineral-water interfaces. The apparent As(III) oxidation amount and K-obs by Ver are 202 +/- 8mmolkg(-1) and 0.3515 min(-1) while that by Ver20 are 162 +/- 7mmolkg(-1) and 0.0139 min(-1). The oxidation capacity and K-obs for Cr(III) by these vernadie samples are also decreased but in a less extent compared to that in As(III) oxidation, e.g. Cr(III) oxidized by Ver and Ver20 are 2895 +/- 47 and 1974 +/- 109 mmol kg(-1) and the K-obs are 0.0439 and 0.0169 min(-1) respectively. Adsorption density of As(V) or Cr(VI) on Ver20 is similar to 15-18% higher than that on Ver. These results suggest the more important role Mn AOS plays in As(III) oxidation than Cr(III) oxidation, and helps understand the geochemical behaviors of these toxic metals in natural environments mediated by Mn oxide minerals.
关键词	Phyllomanganate Mn average oxidation state X-ray adsorption fine structure spectroscopy As(III) oxidation Cr(III) oxidation
DOI	10.1016/j.apgeochem.2018.05.002
关键词[WOS]	X-RAY-ABSORPTION ; TRANSFORM INFRARED-SPECTROSCOPY ; BIOGENIC MANGANESE OXIDE ; CHROMIUM(III) OXIDATION ; HEXAGONAL BIRNESSITE ; ARSENITE OXIDATION ; ARSENIC(III) OXIDATION ; PHYLLOMANGANATE NANOPARTICLES ; SURFACE COMPLEXATION ; REACTION-MECHANISM
收录类别	SCI ; ADS ; EI
语种	英语
WOS研究方向	Geochemistry & Geophysics
WOS类目	Geochemistry & Geophysics
WOS记录号	WOS:000433420400005
EI入藏号	20182105231351
ADS Bibcode	2018ApGC...94...35Z
ADS URL	https://ui.adsabs.harvard.edu/abs/2018ApGC...94...35Z
ADS引文	https://ui.adsabs.harvard.edu/abs/2018ApGC...94...35Z/citations
引用统计	正在获取... 被引频次：26 [ADS]
文献类型	期刊论文
条目标识符	https://ir.ihep.ac.cn/handle/311005/285958
专题	粒子天体物理中心多学科研究中心
作者单位	中国科学院高能物理研究所
第一作者单位	中国科学院高能物理研究所
推荐引用方式 GB/T 7714	Zhang, S,Chen, SF,Liu, F,et al. Effects of Mn average oxidation state on the oxidation behaviors of As(III) and Cr(III) by vernadite[J]. APPLIED GEOCHEMISTRY,2018,94:35-45.
APA	Zhang, S.,Chen, SF.,Liu, F.,Li, JS.,Liang, XL.,...&储胜启.(2018).Effects of Mn average oxidation state on the oxidation behaviors of As(III) and Cr(III) by vernadite.APPLIED GEOCHEMISTRY,94,35-45.
MLA	Zhang, S,et al."Effects of Mn average oxidation state on the oxidation behaviors of As(III) and Cr(III) by vernadite".APPLIED GEOCHEMISTRY 94(2018):35-45.