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学科主题: Engineering ; Water Resources
题名: equilibrium isotherm and mechanism studies of pb(ii) and cd(ii) ions onto hydrogel composite based on vermiculite
作者: Wang Xiaohuan; Wang Aiqin
关键词: Chitosan ; Vermiculite ; Hydrogel composite ; Pb(II) ; Cd(II) ; Adsorption mechanism
刊名: DESALINATION AND WATER TREATMENT
发表日期: 2012
DOI: 10.1080/19443994.2012.698793
卷: 48, 期:1-3, 页:38-49
收录类别: SCI
资助者: National Natural Science Foundation of China 20877077; Science and Technology Support Project of Gansu Provincial Sci. & Tech. Department 0804GKCA03A
摘要: In the present work, the abilities of chitosan-g-poly(acrylic acid)/vermiculite (CTS-g-PAA/VMT) hydrogel composites to remove Pb(II) and Cd(II) ions from aqueous solutions were compared. Batch adsorption studies were carried out to examine the influence of various parameters such as the VMT content, the initial pH value, the contact time, the initial metal ion concentration on adsorption capacities. Adsorption of Pb(II) and Cd(II) ions on the composite showed a pH-dependent profile. The maximum adsorption capacity for both metal ions was found to lie between 5.5 and 6.00. The adsorption processes were all relatively fast. Over 90% of the total adsorption was reached in around 3 min for both Pb(II) and Cd(II) adsorption at 303 K, and the equilibrium was reached after about 15 min of contact time. The adsorption data for the composite fitted well not only the Langmuir model but also the Freundlich model. The maximum Pb(II) adsorption capacity (3.0774 mol/g) of the composite is only a little more than that of Cd(II) (2.9817 mmol/g) at 303 K, however, the desorption efficiency of Pb(II) loaded sample (63.27%) is much lower than that of Cd(II) loaded sample (86.26%) when 0.1 mol/L HNO3 solution was used as the elutent. The adsorption of Pb(II) and Cd(II) ions by the composite seemed to involve ion exchange, chelation, electrostatic attraction or adsorption. -NH2, -COOH and -OH groups are all involved in the adsorption processes. Moreover, there are only few of -NH2 groups participating in the reaction with Pb(II) ions.
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内容类型: 期刊论文
URI标识: http://ir.xjipc.cas.cn/handle/365002/2771
Appears in Collections:环境科学与技术研究室_期刊论文

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作者单位: Chinese Acad Sci, Lanzhou Inst Chem Phys, Ctr Ecomat & Green Chem, Lanzhou 730000, Peoples R China;Chinese Acad Sci, Grad Univ, Beijing 100049, Peoples R China;Chinese Acad Sci, Xinjiang Tech Inst Phys & Chem, Lab Ecomat & Sustainable Technol, Xinjiang 830011, Peoples R China

Recommended Citation:
Wang Xiaohuan,Wang Aiqin. equilibrium isotherm and mechanism studies of pb(ii) and cd(ii) ions onto hydrogel composite based on vermiculite[J]. DESALINATION AND WATER TREATMENT,2012,48(1-3):38-49.
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文件名: Equilibrium isotherm and mechanism studies of Pb(II) and Cd(II) ions onto hydrogel composite based on vermiculite.pdf
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