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Adsorption behavior of amphoteric double-network hydrogel based on poly(acrylic acid) and silica gel

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Abstract

Removal of heavy metals from aqueous solutions has attracted much attention worldwide. Many processes and technologies have been developed to remove heavy metals ions. In our previous study, a silica-poly acrylic amphoteric hybrid hydrogel was successfully prepared with double-network (DN) structure using γ-aminoporpyltriethoxysilane as precursor through a two-step sequential network formation technique. In the present research, the absorption behavior of this hydrogel was investigated carefully using Cu2+ ions and Cr2O 2−7 ions as representatives of negative and positive ions respectively. Under different adsorption conditions, the adsorption behaviors of the hydrogel were studied in detail, including initial concentration of the adsorbed ions, adsorption time, pH and ionic strength. The results showed the absorption capacity to Cu2+ can reach 700 mg/g with an initial Cu2+ concentration of 1,200 mg/L within 2 h. The experimental results show that the Freundlich adsorption law is applicable to the adsorption of Cu2+ and Cr2O 2−7 on the hydrogel.

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Acknowledgement

This work was supported by the National Natural Science Foundation of China (50763005), the Startup Foundation for Doctors of Xinjiang University, China (BS090119), and National University Student Innovation Program of China (101075505).

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Authors and Affiliations

  1. Key Laboratory of Oil and Gas Fine Chemicals Ministry of Education and Xinjiang Uyghur Autonomous Region, College of Chemistry and Chemical Engineering, Xinjiang University, Urumqi, 830046, Xinjiang, People’s Republic of China

    Changlong Fei, Dongqun Huang & Shun Feng

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  1. Changlong Fei
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  2. Dongqun Huang
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  3. Shun Feng
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Correspondence to Shun Feng.

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Fei, C., Huang, D. & Feng, S. Adsorption behavior of amphoteric double-network hydrogel based on poly(acrylic acid) and silica gel. J Polym Res 19, 9929 (2012). https://doi.org/10.1007/s10965-012-9929-y

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