Structure and properties of Co-doped cryptomelane and its enhanced removal of Pb2+ and Cr3+ from wastewater
文献类型：期刊论文
| ; | |
| 作者 | Li, H; Liu, F; Zhu, MQ; Feng, XH; Zhang, J; Yin, H; Zhang J(张静) |
| 刊名 | JOURNAL OF ENVIRONMENTAL SCIENCES-CHINA
 ; JOURNAL OF ENVIRONMENTAL SCIENCES-CHINA
|
| 出版日期 | 2015 ; 2015 |
| 卷号 | 34页码:77-85 |
| 关键词 | Cryptomelane Co doping EXAFS Pb2+ adsorption Cr3+ oxidation Cryptomelane Co doping EXAFS Pb2+ adsorption Cr3+ oxidation |
| ISSN号 | 1001-0742 |
| DOI | 10.1016/j.jes.2015.02.006 |
| 文献子类 | Article |
| 英文摘要 | 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.; 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. |
| 学科主题 | Environmental Sciences & Ecology ; Environmental Sciences & Ecology |
| 类目[WOS] | Environmental Sciences |
| 收录类别 | SCI ; EI |
| 电子版国际标准刊号 | 1878-7320 |
| WOS研究方向 | Environmental Sciences |
| 语种 | 英语 |
| WOS记录号 | WOS:000362980400010 ; WOS:000362980400010 |
| 公开日期 | 2016-05-03 |
| 源URL | [http://ir.ihep.ac.cn/handle/311005/228790]  |
| 专题 | 中国科学院高能物理研究所 |
| 推荐引用方式 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, Structure and properties of Co-doped cryptomelane and its enhanced removal of Pb2+ and Cr3+ from wastewater[J]. JOURNAL OF ENVIRONMENTAL SCIENCES-CHINA, JOURNAL OF ENVIRONMENTAL SCIENCES-CHINA,2015, 2015,34, 34:77-85, 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. |
入库方式： OAI收割
来源：高能物理研究所
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