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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
Source PublicationAPPLIED GEOCHEMISTRY
ISSN0883-2927
Volume94Pages:35-45
SubtypeArticle
AbstractVernadite 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.
KeywordPhyllomanganate Mn average oxidation state X-ray adsorption fine structure spectroscopy As(III) oxidation Cr(III) oxidation
DOI10.1016/j.apgeochem.2018.05.002
WOS KeywordX-RAY-ABSORPTION ; TRANSFORM INFRARED-SPECTROSCOPY ; BIOGENIC MANGANESE OXIDE ; CHROMIUM(III) OXIDATION ; HEXAGONAL BIRNESSITE ; ARSENITE OXIDATION ; ARSENIC(III) OXIDATION ; PHYLLOMANGANATE NANOPARTICLES ; SURFACE COMPLEXATION ; REACTION-MECHANISM
Indexed BySCI ; ADS ; EI
Language英语
WOS Research AreaGeochemistry & Geophysics
WOS SubjectGeochemistry & Geophysics
WOS IDWOS:000433420400005
EI Accession Number20182105231351
ADS Bibcode2018ApGC...94...35Z
ADS URLhttps://ui.adsabs.harvard.edu/abs/2018ApGC...94...35Z
ADS CITATIONShttps://ui.adsabs.harvard.edu/abs/2018ApGC...94...35Z/citations
Citation statistics
Cited Times:3 [ADS]
Document Type期刊论文
Identifierhttp://ir.ihep.ac.cn/handle/311005/285958
Collection粒子天体物理中心
多学科研究中心
Affiliation中国科学院高能物理研究所
First Author AffilicationInstitute of High Energy
Recommended Citation
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.
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