新型石墨烯基复合气凝胶用于废水中钆离子的吸附

Novel Graphene-Based Composite Aerogels for the Adsorption of Gadolinium Ions in Wastewater

通过溶剂热法制备新型的具有3D结构的还原氧化石墨烯/聚氨基膦酸(PAPA)气凝胶(rGO/PAPA)。还原氧化石墨烯与PAPA链交联后得到的气凝胶(rGO/PAPA)被用作Gd(Ⅲ)吸附剂。Gd(Ⅲ)离子的吸附可在15min以内达到吸附平衡,最大吸附量868.5mg/g。rGO/PAPA对Gd(Ⅲ)的吸附过程符合Langmuir等温吸附模型和准二级动力学模型。吸-脱附循环试验表明rGO/PAPA具有良好的再生性能,并且对测试的吸附物具有很高的回收率。

Novel 3 D reduced graphene oxide/poly(amino-phosphonic acid)(PAPA) aerogels(rGO/PAPA) with PAPA were developed by a solvothermal reduction of graphene oxide and cross-linking with PAPA chain, and subsequently employed as an adsorbent for the removal of Gd(Ⅲ) ions from water. It showed a fast adsorption rate(within 15 min) and high adsorption capacity(up to 868.5 mg/g). The uptake of Gd(Ⅲ) by rGO/PAPA was fitted well with the Langmuir isotherm and pseudo-second-order kinetic model. The rGO/PAPA exhibited a good regeneration ability and satisfactory recovery for the tested adsorbates.