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Comparing the adsorption behaviors of Cd, Cu and Pb from water onto Fe-Mn binary oxide, MnO2 and FeOOH

ISSN号：1673-9108
期刊名称：《环境工程学报》
时间：0
分类：O647.3[理学—物理化学;理学—化学] TQ137.12[化学工程—无机化工]
作者机构：[1]Research Center for Eco-Environmental Sciences, Chinese Academy of Sciences, Beijing 100085, China, [2]Graduate University of Chinese Academy of Sciences, Beijing 100039, China, [3]College of Environmental Science and Engineering, Beijing Forestry University, Beijing 100083, China
相关基金：This work was supported by the Funds for the Creative Research Groups of China （Grant No. 50921064） and the National Basic Research Program of China （Grant No. 2007CB407301）.

作者： Wei XU[1,2], Huachun LAN[1], Hongjie WANG[3], Hongming LIU[1], Jiuhui QU[1]

关键词：二氧化锰, 吸附行为, 水性体系, 针铁矿, 二元氧化物, LANGMUIR, 金属离子, 镉, heavy metals, Fe-Mn binary oxide, manga- nese dioxide, ferric hydroxide, adsorption

中文摘要：

FMBO 的吸附潜力， FeOOH ， MnO <潜水艇class=“ a-plus-plus ”>为 Cd 的移动的 2 <啜class=“ a-plus-plus ”>2+, Cu <啜class=“ a-plus-plus ”>2+和 Pb <啜class=“ a-plus-plus ”>在水的系统的2+在这研究被调查。比作 FMBO 和 FeOOH， MnO < 潜水艇 class= “ a-plus-plus ” > 2 向三个金属离子为高得多的移动提供了能力。 MnO 的最大的吸附能力<潜水艇class=“ a-plus-plus ”>为 Cd 的 2 <啜class=“ a-plus-plus ”>2+, Cu <啜class=“ a-plus-plus ”>2+和 Pb <啜class=“ a-plus-plus ”>2+是 1.23 ， 2.25 和 2.60 mmol ???????剕偅??????????????????????￡?? 蓈？？

英文摘要：

The adsorption potential of FMBO, FeOOH, MnO2 for the removal of Cd^2＋, Cu^2＋ and Pb^2＋ in aqueous systems was investigated in this study. Comparing to FMBO and FeOOH, MnO2 offered a much higher removal capacity towards the three metal ions. The maximal adsorption capacity of MnO2 for Cd^2＋, Cu^2＋ and Pb^2＋ were 1.23, 2.25 and 2.60 mmol· g^-1, respectively. And that for FMBO were 0.37, 1.13, and 1.18mmol·g^-1 and for FeOOH were 0.11, 0.86 and 0.48 mmol·g^-1, respectively. The adsorption behaviors of the three metal ions on the three adsorbents were all significantly affected by pH values and heavy metal removal efficiency increased with pH increased. The Langmuir and Freundlieh adsorption models were used to describe the adsorption equilibrium of the three metal ions onto the three adsorbents. Results showed that the adsorption equilibrium data fitted well to Langmuir isotherm and this indicated that adsorption of metal ions occurred on the three metal oxides adsorbents limited to the formation of a monolayer. More negative charged of MnOa surface than that of FMBO and FeOOH could be ascribed by lower pHiep of MnO2 than that of FMBO and FeOOH and this could contribute to more binding sites on MnO2 surface than that of FMBO and FeOOH. The higher metal ions uptake by MnO2 than FMBO and FeOOH could be well explained by the surface charge mechanism.