State Key Laboratory of Environmentally Friendly Energy Materials, Southwest University of Science and Technology, Mianyang, Sichuan, 621010, PR China; Sichuan Co-Innovation Center for New Energetic Material, Southwest University of Science and Technology, Mianyang, Sichuan, 621010, PR China.
State Key Laboratory of Environmentally Friendly Energy Materials, Southwest University of Science and Technology, Mianyang, Sichuan, 621010, PR China.
Carbohydr Polym. 2018 Dec 15;202:425-433. doi: 10.1016/j.carbpol.2018.08.133. Epub 2018 Sep 5.
Three-dimensional network structure of konjac glucomannan/graphene oxide (KGM/GO) sponges was successfully prepared by ice template method. The KGM/GO sponges was rich in functional groups, negatively charged under pH 2 to 10. Batch adsorption experiment was conducted to investigate the adsorption performance of the as-prepared KGM/GO sponges for organic dye (malachite green (MG)) and radionuclide (uranium U(Ⅵ)). The results showed that the maximum adsorption capacities of KGM/GO sponges were 266.97, 189.96 mg/g for U(Ⅵ) and MG, respectively. Moreover, the KGM/GO sponges exhibited an excellent selectivity for capturing U(Ⅵ) in multi-ion system. The adsorption process was fitted better to pseudo-second order model, while adsorption isotherms for these pollutants were well matched up to Langmuir models. In addition, KGM/GO sponges can be easily separated from the aqueous solution and could be effectively reused for 5 times without obvious loss in adsorption performance. The advantages of eco-friendliness, low cost, simple preparation process, controllable shape and size, as well as high adsorption capacities for MG and U(Ⅵ), suggested that KGM/GO sponges promising in water pollution control.
通过冰模板法成功制备了魔芋葡甘聚糖/氧化石墨烯（KGM/GO）海绵的三维网络结构。KGM/GO 海绵富含官能团，在 pH 2 至 10 下带负电荷。通过批量吸附实验研究了所制备的 KGM/GO 海绵对有机染料（孔雀石绿（MG））和放射性核素（铀 U(VI)）的吸附性能。结果表明，KGM/GO 海绵对 U(VI)和 MG 的最大吸附容量分别为 266.97、189.96mg/g。此外，KGM/GO 海绵在多离子体系中对捕获 U(VI)表现出优异的选择性。吸附过程更符合拟二级动力学模型，而这些污染物的吸附等温线与 Langmuir 模型很好地匹配。此外，KGM/GO 海绵可以很容易地从水溶液中分离出来，并可以重复使用 5 次而没有明显的吸附性能损失。KGM/GO 海绵具有环保、成本低、制备工艺简单、形状和尺寸可控以及对 MG 和 U(VI)具有高吸附能力等优点，有望在水污染控制方面得到广泛应用。
