The preferential retention of Zn-VI over Zn-IV on birnessite during dissolution/desorption

doi:10.1016/j.clay.2018.04.017

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	The preferential retention of Zn-VI over Zn-IV on birnessite during dissolution/desorption
	Qin, ZJ; Yin, H; Wang, XM; Zhang, Q; Lan, S; Koopal, LK; Zheng, LR; Feng, XH; Liu, F; Zheng LR(郑黎荣)
刊名	APPLIED CLAY SCIENCE
	2018
卷号	161 页码:169-175
关键词	Zinc coordination Birnessite Dissolution Desorption Extended X-ray absorption fine structure spectroscopy
ISSN号	0169-1317
DOI	10.1016/j.clay.2018.04.017
文献子类	Article
英文摘要	Zn is a common heavy metal in soils and sediments. In this study, the release behaviors of octahedral (Zn-IV) and tetrahedral (Zn-IV) Zn complexes on synthesized hexagonal birnessite were explored by solution chemistry method in combination with spectroscopic analysis. In acidic dissolution processes, the release of adsorbed Zn2+ from birnessite occurred into two stages: in the first stage, similar to 60% of Zn2+ was desorbed rapidly, with only 8% of Mn being released, and the ratio of Zn-VI/Zn-IV increased with time; in the second stage, the residual Zn2+ was mostly Zn-VI and released slowly at a nearly constant rate until complete dissolution of the matrix mineral was observed. During desorption of Zn2+ by Pb2+, the ratio of Zn-VI/Zn-IV on birnessite also increased, while the residual percentage of Zn-VI remained nearly constant. However, it is known that Zn-IV-triple corner-sharing (TCS) is more stable than Zn-VI-TCS, suggesting that part of the remaining Zn-IV-TCS on birnessite might transform to Zn-VI-TCS immediately when Zn-VI-TCS is replaced by H+ or Pb2+. Additionally, the possible distribution of Mn3+ and Zn-IV or the partial charge compensation by protons can lead to the preferential retention of Zn-IV on birnessite or the preferential re-adsorption of Zn-IV at the new edge sites. These results can provide new insights into the geochemical behavior of Zn2+ contaminant in soil and aquatic environments.
电子版国际标准刊号	1872-9053
WOS关键词	X-RAY-DIFFRACTION ; METAL SORBED BIRNESSITE ; NA-RICH BIRNESSITE ; BIOGENIC MN-OXIDES ; HEXAGONAL-BIRNESSITE ; MANGANESE OXIDE ; HEAVY-METALS ; PHYLLOMANGANATE NANOPARTICLES ; ABSORPTION SPECTROSCOPY ; FERROMANGANESE COATINGS
WOS研究方向	Chemistry ; Materials Science ; Mineralogy
语种	英语
WOS记录号	WOS:000436916600021
内容类型	期刊论文
源URL	[http://ir.ihep.ac.cn/handle/311005/286084]
专题	高能物理研究所_核技术应用研究中心高能物理研究所_多学科研究中心中国科学院高能物理研究所_中国散裂中子源
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	Qin, ZJ,Yin, H,Wang, XM,et al. The preferential retention of Zn-VI over Zn-IV on birnessite during dissolution/desorption[J]. APPLIED CLAY SCIENCE,2018,161:169-175.
APA	Qin, ZJ.,Yin, H.,Wang, XM.,Zhang, Q.,Lan, S.,...&郑黎荣.(2018).The preferential retention of Zn-VI over Zn-IV on birnessite during dissolution/desorption.APPLIED CLAY SCIENCE,161,169-175.
MLA	Qin, ZJ,et al."The preferential retention of Zn-VI over Zn-IV on birnessite during dissolution/desorption".APPLIED CLAY SCIENCE 161(2018):169-175.