| Equilibrium isotherm and mechanism studies of Pb(II) and Cd(II) ions onto hydrogel composite based on vermiculite | |
| Department | 环境材料与生态化学研究发展中心 |
Wang XH(王晓焕)1,2,3; Wang AQ(王爱勤)1 ; Wang AQ(王爱勤)
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| 2012 | |
| Source Publication | Desalination and Water Treatment
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| ISSN | 1944-3994 |
| Volume | 48Issue:1-3Pages:38-49 |
| Abstract | 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 infl uence 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 fi tt ed 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 litt le more than that of Cd(II) (2.9817 mmol/g) at 303 K, however, the desorption effi ciency 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 att raction 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. |
| Keyword | Chitosan Vermiculite Hydrogel Composite Pb(Ii) Cd(Ii) Adsorption Mechanism |
| Subject Area | 环境材料与生态化学 |
| DOI | 10.1080/19443994.2012.698793 |
| Funding Organization | the National Natural Science Foundation of China (No. 20877077);Science and Technology Support Project of Gansu Provincial Sci. & Tech. Department (No. 0804GKCA03A) |
| Indexed By | SCI |
| Language | 英语 |
| Funding Project | 功能复合材料组 |
| compositor | 第一作者单位 |
| Citation statistics | |
| Document Type | 期刊论文 |
| Identifier | http://ir.licp.cn/handle/362003/2548 |
| Collection | 环境材料与生态化学研究发展中心 |
| Corresponding Author | Wang AQ(王爱勤) |
| Affiliation | 1.Chinese Acad Sci, Lanzhou Inst Chem Phys, Ctr Ecomat & Green Chem, Lanzhou 730000, Peoples R China 2.Chinese Acad Sci, Grad Univ, Beijing 100049, Peoples R China 3.Chinese Acad Sci, Xinjiang Tech Inst Phys & Chem, Lab Ecomat & Sustainable Technol, Xinjiang 830011, Peoples R China |
| Recommended Citation GB/T 7714 | Wang XH,Wang AQ,Wang AQ. 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. |
| APA | Wang XH,Wang AQ,&王爱勤.(2012).Equilibrium isotherm and mechanism studies of Pb(II) and Cd(II) ions onto hydrogel composite based on vermiculite.Desalination and Water Treatment,48(1-3),38-49. |
| MLA | Wang XH,et al."Equilibrium isotherm and mechanism studies of Pb(II) and Cd(II) ions onto hydrogel composite based on vermiculite".Desalination and Water Treatment 48.1-3(2012):38-49. |
| Files in This Item: | ||||||
| File Name/Size | DocType | Version | Access | License | ||
| 201248133849.pdf（387KB） | 期刊论文 | 作者接受稿 | 开放获取 | CC BY-NC-SA | View Application Full Text | |
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