Abstract
The chemically-crosslinked composite hydrogel based on acylated xylan and silanized graphene oxide was prepared via free radical polymerization as a novel adsorbent for the removal of Cu2+ ions from aqueous solution. The chemical structures and morphologies of the silanized graphene oxide and acylated xylan as well as the prepared hydrogels were characterized by FT-IR, XPS, SEM and TEM. The swelling ratios of the prepared hydrogels were determined, and the results showed that the chemically-crosslinked hydrogel was pH-sensitive, and the swelling kinetics of the hydrogels followed Schott second-order kinetic. The optimum pH for the adsorption of Cu2+ ions onto the chemically-crosslinked composite hydrogel was found at the value of 5 and the maximum adsorption amount of Cu2+ ions was evaluated to be 228 mg/g. The adsorption isotherm accorded with the Freundlich model, and the pseudo-second order kinetic model was suitable to describe the adsorption process. The study of adsorption thermodynamics indicated that the adsorption of Cu2+ ions onto the chemically-crosslinked composite hydrogel was endothermal and spontaneous, and the adsorption amount rose with an increase in temperature. In addition, higher desorption percentages of Cu2+ ions from the used hydrogel were also achieved (77.3% after recycling for 6 times). All obtained results indicated that the prepared chemically-crosslinked hydrogel is promising for water treatment and collection of metal ions.
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Acknowledgements
We would like to thank the Analytical & Testing Center of Northwestern Polytechnical University for XPS test. The authors are grateful the supports by the Science and Technology Planning Project of Shenzhen Municipality (No. KCXFZ20201221173004012) and National College Students Innovation and Entrepreneurship Training Program (202110699137).
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Sun, XF., **e, Y., Shan, S. et al. Chemically-Crosslinked Xylan/Graphene Oxide Composite Hydrogel for Copper Ions Removal. J Polym Environ 30, 3999–4013 (2022). https://doi.org/10.1007/s10924-022-02475-5
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DOI: https://doi.org/10.1007/s10924-022-02475-5