Department of Chemistry, Tongji University, Shanghai, China.
Department of Chemistry, Tongji University, Shanghai, China ; Advanced Research Institute, Tongji University, Shanghai, China.
PLoS One. 2014 Feb 20;9(2):e88802. doi: 10.1371/journal.pone.0088802. eCollection 2014.
Developing the application of high-strength hydrogels has gained much attention in the fields of medical, pharmacy, and pollutant removal due to their versatility and stimulus-responsive properties. In this presentation, a high-strength freestanding elastic hydrogel membrane was constructed by clay nanosheets, N, N-dimethylacrylamide and 2-acrylamide-2-methylpropanesulfonic acid for adsorption of methylene blue and heavy metal ions. The maximum values of elongation and Young's modulus for 0.5% AMPSNa hydrogel were 1901% and 949.4 kPa, respectively, much higher than those of traditional hydrogels. The adsorptions were confirmed to follow pseudo-second kinetic equation and Langmuir isotherm model fits the data well. The maximum adsorption capacity of hydrogel towards methylene blue was 434.8 mg g(-1). The hydrogel also exhibited higher separation selectivity to Pb(2+) than Cu(2+). The methylene blue adsorbed onto the hydrogel membrane can be photocatalytically degraded by Fenton agent and the hydrogel membrane could be recycled at least five times without obvious loss in mechanical properties. In conclusion, this presentation demonstrates a convenient strategy to prepare tough and elastic clay nanocomposite hydrogel, which can not only be applied as recyclable membrane for the photocatalytic degradation of organic dye, but also for the recovery of valuables.
由于高强度水凝胶的多功能性和刺激响应特性，其在医学、药学和污染物去除等领域的应用得到了广泛关注。在本次演讲中，我们构建了一种由粘土纳米片、N,N-二甲基丙烯酰胺和 2-丙烯酰胺-2-甲基丙磺酸组成的高强度自立弹性水凝胶膜，用于吸附亚甲基蓝和重金属离子。0.5% AMPSNa 水凝胶的最大伸长率和杨氏模量值分别为 1901%和 949.4 kPa，明显高于传统水凝胶。吸附实验结果表明，吸附过程符合准二级动力学方程和朗缪尔等温吸附模型。水凝胶对亚甲基蓝的最大吸附容量为 434.8 mg g(-1)。此外，该水凝胶对 Pb(2+)的分离选择性高于 Cu(2+)。水凝胶膜吸附的亚甲基蓝可以通过芬顿试剂进行光催化降解，水凝胶膜在回收过程中至少可以循环使用五次，而机械性能没有明显损失。总之，本研究展示了一种制备坚韧弹性粘土纳米复合材料水凝胶的简便策略，该水凝胶不仅可以用作光催化降解有机染料的可回收膜，还可以用于回收有价值的物质。
