IHEP OpenIR  > 多学科研究中心
Characterization of Ni-rich hexagonal birnessite and its geochemical effects on aqueous Pb2+/Zn2+ and As(III)
Yin, H; Tan, WF; Zheng LR(郑黎荣); Zheng, LR; Cui, HJ; Qiu, GH; Liu, F; Feng, XH
2012
发表期刊GEOCHIMICA ET COSMOCHIMICA ACTA
卷号93页码:47-62
摘要Hexagonal birnessite is the most ubiquitous manganese oxide in geological environments. It is often highly enriched in trace metal ions such as Ni and plays an important role in metal(loids) geochemistry. Nanostructured birnessites containing different amounts of Ni were synthesized by addition of Ni2+ to initial reactants. Powder X-ray diffraction (XRD), element analysis, field emission scanning electron microscopy (FE-SEM), X-ray photoelectron spectroscopy (XPS), thermogravimetric analysis (TGA), X-ray absorption spectroscopy (XAS) and isothermal adsorption and oxidation of metal(loids) were carried out to investigate the effects of Ni doping on the substructure and physicochemical properties of birnessite, and Ni crystal chemistry in birnessite. These Ni-rich birnessites have Ni contents as high as 2.99% (Ni5) and 6.08% (Ni10) in weight. EXAFS results show that Ni5 has 23.7% of the total Ni (0.71 wt.%) and Ni10 has 34.5% of the total Ni (2.10 wt.%) in Mn octahedral layer with the remaining Ni located at vacancies and edge sites. The Ni-rich birnessites have weaker crystallinity and thermal stability, fewer layers stacked along the c axis, similar to 1.5-2.7 times larger surfaces areas, and a higher Mn average oxidation numbers (AONs) compared to the birnessite without Ni. Additionally, the doping of Ni during birnessite crystallization enhances the formation of vacancies in the layer; however, adsorption capacities for Pb2+ and Zn2+ by these Ni-rich birnessites are reduced, mainly because of vacancies and edge sites occupation by a large amount of Ni. The Ni-rich birnessites exhibit much higher oxidation capability and can completely oxidize As(III) in solution at rapid initial reaction rates under the experimental condition. The results indicate that incorporation of Ni into the natural birnessite in ferromanganese nodules may be achieved both by direct coprecipitation with Mn to build the layers and migration over time from adsorbed Ni on the surface into the layer structure. It is also implied that Ni doping in birnessite has great impact on the geochemical behaviors of heavy metals, either in adsorption or oxidation reactions. (C) 2012 Elsevier Ltd. All rights reserved.
学科领域Geochemistry & Geophysics
DOI10.1016/j.gca.2012.05.039
收录类别SCI
WOS记录号WOS:000308426800004
引用统计
被引频次:37[WOS]   [WOS记录]     [WOS相关记录]
文献类型期刊论文
条目标识符http://ir.ihep.ac.cn/handle/311005/223793
专题多学科研究中心
推荐引用方式
GB/T 7714
Yin, H,Tan, WF,Zheng LR,et al. Characterization of Ni-rich hexagonal birnessite and its geochemical effects on aqueous Pb2+/Zn2+ and As(III)[J]. GEOCHIMICA ET COSMOCHIMICA ACTA,2012,93:47-62.
APA Yin, H.,Tan, WF.,郑黎荣.,Zheng, LR.,Cui, HJ.,...&Feng, XH.(2012).Characterization of Ni-rich hexagonal birnessite and its geochemical effects on aqueous Pb2+/Zn2+ and As(III).GEOCHIMICA ET COSMOCHIMICA ACTA,93,47-62.
MLA Yin, H,et al."Characterization of Ni-rich hexagonal birnessite and its geochemical effects on aqueous Pb2+/Zn2+ and As(III)".GEOCHIMICA ET COSMOCHIMICA ACTA 93(2012):47-62.
条目包含的文件
文件名称/大小 文献类型 版本类型 开放类型 使用许可
585.pdf(1061KB)期刊论文作者接受稿限制开放CC BY-NC-SA请求全文
个性服务
推荐该条目
保存到收藏夹
查看访问统计
导出为Endnote文件
谷歌学术
谷歌学术中相似的文章
[Yin, H]的文章
[Tan, WF]的文章
[郑黎荣]的文章
百度学术
百度学术中相似的文章
[Yin, H]的文章
[Tan, WF]的文章
[郑黎荣]的文章
必应学术
必应学术中相似的文章
[Yin, H]的文章
[Tan, WF]的文章
[郑黎荣]的文章
相关权益政策
暂无数据
收藏/分享
所有评论 (0)
暂无评论
 

除非特别说明,本系统中所有内容都受版权保护,并保留所有权利。