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Structure and properties of Co-doped cryptomelane and its enhanced removal of Pb2+ and Cr3+ from wastewater
Li, H; Liu, F; Zhu, MQ; Feng, XH; Zhang, J; Yin, H; Zhang J(张静)
2015
发表期刊JOURNAL OF ENVIRONMENTAL SCIENCES-CHINA
卷号34页码:77-85
摘要Cryptomelane is a reactive Mn oxide and has been used in removal of heavy metal from wastewaters. Co-doped cryptomelane was synthesized by refluxing at ambient pressure and characterized by powder X-ray diffraction, scanning electron microscopy, X-ray photoelectron spectroscopy and extended X-ray absorption fine structure spectroscopy, and its performances for removal of Pb2+ and Cr3+ from aqueous solutions were investigated. Co doping has a negligible effect on the structure and morphology of cryptomelane but increases the specific surface area and Mn average oxidation state. Mn and Co K-edge extended X-ray absorption fine structure spectroscopy (EXAFS) analysis shows that Co barely affects the atomic coordination environments of Mn, and distances of edge-and corner-sharing Co-Me (Me=Co, Mn) pairs are shorter than those of the corresponding Mn-Me pairs, implying the replacement of framework Mn(III) by Co(III). These Co-doped cryptomelanes can quickly oxidize Cr3+ to be HCrO4- and remove 45%-66% of the total Cr in the reaction systems by adsorption and fixation, and they have enhanced Pb2+ adsorption capacities. Thus these materials are promising adsorbents for heavy metal remediation. The results demonstrate the design and modification of environmental friendly Mn oxide materials and can help us understand the interaction mechanisms of transition metals with Mn oxides. (C) 2015 The Research Center for Eco-Environmental Sciences, Chinese Academy of Sciences. Published by Elsevier B.V.
文章类型Article
关键词Cryptomelane Co doping EXAFS Pb2+ adsorption Cr3+ oxidation
学科领域Environmental Sciences & Ecology
DOI10.1016/j.jes.2015.02.006
收录类别SCI ; EI
WOS类目Environmental Sciences
WOS记录号WOS:000362980400010
引用统计
被引频次:7[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/311005/228790
专题多学科研究中心
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GB/T 7714
Li, H,Liu, F,Zhu, MQ,et al. Structure and properties of Co-doped cryptomelane and its enhanced removal of Pb2+ and Cr3+ from wastewater[J]. JOURNAL OF ENVIRONMENTAL SCIENCES-CHINA,2015,34:77-85.
APA Li, H.,Liu, F.,Zhu, MQ.,Feng, XH.,Zhang, J.,...&张静.(2015).Structure and properties of Co-doped cryptomelane and its enhanced removal of Pb2+ and Cr3+ from wastewater.JOURNAL OF ENVIRONMENTAL SCIENCES-CHINA,34,77-85.
MLA Li, H,et al."Structure and properties of Co-doped cryptomelane and its enhanced removal of Pb2+ and Cr3+ from wastewater".JOURNAL OF ENVIRONMENTAL SCIENCES-CHINA 34(2015):77-85.
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