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| Phosphate adsorption by composites of chitosan-saturated montmorillonite |
| Received:March 20, 2017 |
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| KeyWord:montmorillonite;chitosan;nanocomposite;phosphate;adsorption |
| Author Name | Affiliation | E-mail | | HU Chao | Key Laboratory of Quality Control of Characteristic Fruits and Vegetables of Hubei Province, Hubei Engineering University, Xiaogan 432000, China
College of Resources and Environment, Huazhong Agricultural University, Wuhan 430070, China | | | WANG You-ning | Key Laboratory of Quality Control of Characteristic Fruits and Vegetables of Hubei Province, Hubei Engineering University, Xiaogan 432000, China | | | ZHENG Zu-hong | Key Laboratory of Quality Control of Characteristic Fruits and Vegetables of Hubei Province, Hubei Engineering University, Xiaogan 432000, China | | | ZHANG Ai-qun | Key Laboratory of Quality Control of Characteristic Fruits and Vegetables of Hubei Province, Hubei Engineering University, Xiaogan 432000, China | | | HU Hong-qing | College of Resources and Environment, Huazhong Agricultural University, Wuhan 430070, China | hqhu@mail.hzau.edu.cn |
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| Abstract: |
| The montmorillonite-chitosan composite had attracted wide interest because this "green" and low-cost natural material can meet many requirements of adsorbents. The composite has been used for removal of potential toxic elements, yet its adsorption of phosphate needs further study. Chitosan-saturated montmorillonite was characterized and used as an adsorbent for the removal of phosphate from an aqueous medium in this study. The results showed the adsorbed chitosan intercalated into the interlayer of the montmorillonite, and the adsorbed phosphate on the composite increased with increasing pH from 2 to 6, reaching its maximal amount of 16.15 mg·g-1 at pH 6. However, the adsorbed amount decreased with increasing pH from 6 to 9, and the phosphate adsorption reached equilibrium at about 3 h. The pseudo-second-order equation better fit the data than the other models did, indicating chemisorption might be the rate controlling step. The adsorption was spontaneous, feasible, and exothermic. The isotherm adsorption was best fitted by the Langmuir model, and the theoretical adsorption capacity was 16.36 mg·g-1. These results could provide scientific basis for the application of the chitosan-montmorillonite composite in the removal of phosphate from aqueous media. |
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