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中南大学学报(自然科学版)

Journal of Central South University

第43卷    第2期    总第210期    2012年2月

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文章编号:1672-7207(2012)02-0776-07
不同锰氧化度水钠锰矿的XPS研究
赵巍1, 2,刘凡3,冯雄汉3,谭文峰2, 3

(1. 西北农林科技大学 黄土高原土壤侵蚀与旱地农业国家重点实验室,陕西 杨凌,712100;
2. 中国科学院 水利部水土保持研究所黄土高原土壤侵蚀与旱地农业国家重点实验室,陕西 杨凌,712100;
3. 华中农业大学 农业部亚热带农业资源与环境重点开放实验室,湖北 武汉,430070
)

摘 要: 为了了解水钠锰矿八面体空位的具体分布状况以及表面化学性质,采用X线光电子能谱技术(XPS)对不同锰氧化度水钠锰矿表面Mn与O元素的化学状态进行研究;探讨水钠锰矿结构中空位的分布状况,并建立结构模型。研究结果表明:在高真空测试环境下,在不同锰氧化度水钠锰矿结构中,Mn存在饱和配位和不饱和配位2种化学状态,其含量(摩尔数分数,下同)分别为83.79%~91.69%和8.31%~17.21%;对于锰氧化度较高的水钠锰矿,不饱和配位Mn的含量较小;O以晶格氧、羟基氧和水分子中氧3种化学状态存在,其含量分别为50.44%~65.05%,24.90%~39.27%和8.07%~12.63%;对于锰氧化度较高的水钠锰矿,结构中羟基氧的含量较大;当水钠锰矿沿(110)方向上含Mn3+的MnO6八面体链中Mn3+含量增大时,结构中空位含量相应减少。

 

关键字: 锰氧化度;水钠锰矿;X线光电子能谱;空位分布;结构模型

XPS study on birnessites with different average oxidation states
ZHAO Wei1, 2, LIU Fan3, FENG Xiong-han3, TAN Wen-feng2, 3

1. State Key Laboratory of Soil Erosion and Dryland Farming on Loess Plateau,
Northwest Agriculture and Forest University, Yangling 712100, China;
2. State Key Laboratory of Soil Erosion and Dryland Farming on Loess Plateau, Institute of Soil and Water Conservation,
Chinese Academy of Sciences and Ministry of Water Resources, Yangling 712100, China;
3. Key Laboratory of Subtropical Agriculture Resource & Environment, Ministry of Agriculture of China,
Huazhong Agricultural University, Wuhan 430070, China

Abstract:In order to obtain the information on the distribution of vacant sites in birnessite and surface chemistry characteristics of birnessite, the investigation on chemistry states of Mn or O element on the surface of birnessites with different Mn average oxidation states (AOS) was carried out by X-ray photoelectron spectroscopy (XPS). Structure models of birnessites were presumed. The results indicate that there are two chemistry states of Mn, i.e., saturated and undersaturated coordinately Mn, whose relative contents are 83.79%-91.69% and 8.31%-17.21%, respectively. The relative content of undersaturated coordinately Mn decreases with the increase of AOS in birnessite. There are three chemistry states of oxygen, i.e., lattice oxygen, hydroxide and H2O, whose relative contents are 50.44%-65.05%, 24.90%-39.27% and 8.07%-12.63%, respectively. The relative content of chemistry state of hydroxide increases with the increase of AOS in birnessite. The vacant sites decreases with the increase of the Mn3+ relative content in the Mn3+-rich MnO6 rows.

 

Key words: oxidation state; birnessite; X-ray photoelectron spectroscopy; distribution of vacant site; structure model

中南大学学报(自然科学版)
  ISSN 1672-7207
CN 43-1426/N
ZDXZAC
中南大学学报(英文版)
  ISSN 2095-2899
CN 43-1516/TB
JCSTFT
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