当前位置: X-MOL 学术J. Polym. Environ. › 论文详情
Our official English website, www.x-mol.net, welcomes your feedback! (Note: you will need to create a separate account there.)
Chemically-Crosslinked Xylan/Graphene Oxide Composite Hydrogel for Copper Ions Removal
Journal of Polymers and the Environment ( IF 5.3 ) Pub Date : 2022-06-10 , DOI: 10.1007/s10924-022-02475-5
Xiao-Feng Sun , Yangyang Xie , Shuang Shan , Wenbo Li , Le Sun

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.



中文翻译:

用于去除铜离子的化学交联木聚糖/氧化石墨烯复合水凝胶

通过自由基聚合制备了基于酰化木聚糖和硅烷化氧化石墨烯的化学交联复合水凝胶,作为一种新型吸附剂,用于去除水溶液中的Cu 2+离子。通过FT-IR、XPS、SEM和TEM对硅烷化氧化石墨烯和酰化木聚糖以及制备的水凝胶的化学结构和形貌进行了表征。测定了制备的水凝胶的溶胀比,结果表明化学交联的水凝胶对pH敏感,水凝胶的溶胀动力学遵循肖特二级动力学。化学交联复合水凝胶吸附Cu 2+离子的最佳pH值为5,Cu的最大吸附量为5。2+离子经评估为 228 mg/g。吸附等温线符合Freundlich模型,准二级动力学模型适合描述吸附过程。吸附热力学研究表明,Cu 2+离子在化学交联复合水凝胶上的吸附是吸热自发的,吸附量随温度升高而增加。此外,使用过的水凝胶中Cu 2+离子的解吸率也更高(循环6次后为77.3%)。所有获得的结果表明,制备的化学交联水凝胶有望用于水处理和金属离子的收集。

更新日期:2022-06-10
down
wechat
bug