Effects of Co and Ni co-doping on the structure and reactivity of hexagonal birnessite
Yin, H; Li, H; Wang, Y; Ginder-Vogel, M; Qiu, GH; Feng, XH; Zheng, LR; Liu, F; Zheng LR(郑黎荣)
刊名CHEMICAL GEOLOGY
2014
卷号381页码:10-20
关键词Manganese oxides Hexagonal birnessite Transition metal Co and Ni co-doping X-ray absorption fine structure spectroscopy
学科分类Geochemistry & Geophysics
DOI10.1016/j.chemgeo.2014.05.017
英文摘要Natural hexagonal birnessites are enriched in various transition metals (TMs). Many studies have examined the effects of single metal doping on the structures and properties of birnessites, but none focused on the simultaneous interaction mechanism of coprecipitation of two different TMs with birnessite. In this work Co and Ni co-doped hexagonal birnessites were synthesized and characterized by powder X-ray diffraction (XRD), elemental analysis, field emission scanning electron microscopy (FE-SEM), X-ray photoelectron spectroscopy (XPS) and X-ray absorption fine structure (XAFS) spectroscopy to investigate the effects of co-doping on the structure and reactivity of birnessite and the crystal chemistry of Co and Ni. These co-doped birnessites have lower crystallinity, i.e., fewer manganese layers stacking in the c* direction, larger specific surface areas (SSAs) and increased Mn average oxidation states (AOSs) than the undoped birnessite, and Co exists in a valence of +3. Co, Ni and Mn K-edge extended X-ray absorption fine structure spectroscopy (EXAFS) spectra demonstrate an increase in edge-sharing Ni-Me (Me = Ni, Co and Mn) distances in birnessite layers with the increase of the contents of dopants while Mn-Me distances first decrease and then increase while those of Co-Me pairs are nearly constant, coupled with first a decrease and then increase of the in-plane unit-cell parameter b. The effect of co-doping on the amounts of structural Mn and K+, numbers of [MnO6] layers stacked in c* axis, and SSAs, is larger than the effects of doping with Co alone, but less than singly Ni doping. In birnessites doped with both Co and Ni, similar to 74-79% of the total Co and similar to 23-39% of the total Ni are present within the manganese layers. Compared with the spatial distribution of TM in singly doped birnessites, the coexistence of Ni hinders the incorporation of Co into the layers during birnessite crystallization; however, coprecipitation with Co has little effects, neither hindrance nor promotion, on the insertion of Ni into the layers. These results provide insight into the interaction mechanism between coexisting Co, Ni within layered Mn oxides. It further helps us to interpret the geochemical characteristics of multi-metal incorporation into natural Mn oxides and their effects on the structures and physicochemical properties of these minerals. (C) 2014 Elsevier B.V. All rights reserved.
收录类别SCI
WOS记录号WOS:000340208500002
引用统计
被引频次:12[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/311005/224882
专题中国科学院高能物理研究所_多学科研究中心_期刊论文
中国科学院高能物理研究所_多学科研究中心
推荐引用方式
GB/T 7714
Yin, H,Li, H,Wang, Y,et al. Effects of Co and Ni co-doping on the structure and reactivity of hexagonal birnessite[J]. CHEMICAL GEOLOGY,2014,381:10-20.
APA Yin, H.,Li, H.,Wang, Y.,Ginder-Vogel, M.,Qiu, GH.,...&郑黎荣.(2014).Effects of Co and Ni co-doping on the structure and reactivity of hexagonal birnessite.CHEMICAL GEOLOGY,381,10-20.
MLA Yin, H,et al."Effects of Co and Ni co-doping on the structure and reactivity of hexagonal birnessite".CHEMICAL GEOLOGY 381(2014):10-20.
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
10773.pdf(1548KB)期刊论文作者接受稿开放获取CC BY-NC-SA浏览 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
[Li, H]的文章
[Wang, Y]的文章
百度学术
百度学术中相似的文章
[Yin, H]的文章
[Li, H]的文章
[Wang, Y]的文章
必应学术
必应学术中相似的文章
[Yin, H]的文章
[Li, H]的文章
[Wang, Y]的文章
相关权益政策
暂无数据
收藏/分享
文件名: 10773.pdf
格式: Adobe PDF
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。