Abou El-Reash Y G, Abdelghany A M, Elrazak A Abd
Mansoura University, Faculty of Science, Chemistry Department, 35516, Mansoura, Egypt; University of Ulm, Institute of Analytical and Bioanalytical Chemistry, Ulm, Germany.
National Research Center, Physics Division, Spectroscopy Department, Dokki, 12311 Cairo, Egypt.
Int J Biol Macromol. 2016 May;86:789-98. doi: 10.1016/j.ijbiomac.2016.01.101. Epub 2016 Feb 4.
In the present study, adsorption of Cu(II) ions from aqueous solutions was evaluated using new thin adsorptive membranes modified with silver nanoparticles. Membranes were prepared from chitosan/polyacrylamide polymer blend. The variation of adsorption process was investigated in batch sorption mode. Infrared absorption spectra were applied for chemical characterization of the prepared polymer blend. Thermogravimetric analysis showed that addition of polyacrylamide to chitosan increased its thermal stability. The kinetics and thermodynamic parameters of Cu(II) ions adsorption onto the membranes were studied by removal experiments of Cu(II) ions from standard aqueous solutions. The kinetic data fitted to the traditional Lagergren adsorption kinetic equations. Thermodynamic studies indicated endothermic (ΔH°> 0) and spontaneous (ΔG°< 0) adsorption together with entropy generation (ΔS°> 0) at the solid/liquid interface process. Regeneration experiments showed that the newly prepared membranes could be reconditioned without significant loss of its initial properties even after three adsorption-desorption cycles. The results suggest that the prepared composite membranes can be efficiently applied for the adsorptive removal of Cu(II) ions from natural water samples. Antimicrobial activity was tested against two gram negatives, two gram positives and Candida sp. microbes and they showed a remarkable bioactivity indicating the capability of applying such membranes for a dual action.
在本研究中，使用经银纳米颗粒改性的新型薄吸附膜评估了从水溶液中吸附铜（II）离子的情况。膜由壳聚糖/聚丙烯酰胺聚合物共混物制备而成。在分批吸附模式下研究了吸附过程的变化。采用红外吸收光谱对制备的聚合物共混物进行化学表征。热重分析表明，向壳聚糖中添加聚丙烯酰胺提高了其热稳定性。通过从标准水溶液中去除铜（II）离子的实验，研究了铜（II）离子在膜上吸附的动力学和热力学参数。动力学数据符合传统的 Lagergren 吸附动力学方程。热力学研究表明，在固/液界面过程中，吸附是吸热的（ΔH°> 0）、自发的（ΔG°< 0）且伴有熵产生（ΔS°> 0）。再生实验表明，新制备的膜即使经过三次吸附 - 解吸循环后也能进行修复，且其初始性能不会有显著损失。结果表明，制备的复合膜可有效地用于从天然水样中吸附去除铜（II）离子。对两种革兰氏阴性菌、两种革兰氏阳性菌和念珠菌属微生物进行了抗菌活性测试，结果表明它们具有显著的生物活性，这表明这种膜具有双重作用的应用能力。
