Polymer Chemistry Laboratory, Department of Applied Chemistry, Indian School of Mines, Dhanbad 826 004, India.
Bioresour Technol. 2012 Sep;119:181-90. doi: 10.1016/j.biortech.2012.05.063. Epub 2012 May 22.
This article highlights the development of a novel nanocomposite based on nanosilica filled modified natural polymer (i.e. xanthan gum grafted with polyacrylamide:XG-g-PAM) for removal of Pb(2+) ions from aqueous solution. The chemical, structural, textural, and rheological characteristics of the nanocomposite (XG-g-PAM/SiO(2)) revealed stronger interaction of silica nanoparticles with polymer matrix and showed maximum adsorption capacity (Q(max)=537.634 mg g(-1)) of Pb(2+) ion, which is significantly higher than other reported adsorbents. This developed novel material also finds potential application as an efficient adsorbent for the treatment of battery industry wastewater. The enhanced adsorption efficiency may be because of its higher hydrodynamic radius and hydrodynamic volume. The adsorption kinetic parameters were best described by pseudo-second-order model. The adsorption equilibrium data fitted well with Langmuir isotherm. The thermodynamic studies confirm that the adsorption is spontaneous and endothermic. Desorption studies affirmed the regenerative efficacy of loaded Pb(2+).
本文重点介绍了一种新型纳米复合材料的开发，该材料基于纳米二氧化硅填充改性天然聚合物（即接枝聚丙烯酰胺的黄原胶：XG-g-PAM），用于从水溶液中去除 Pb(2+)离子。纳米复合材料（XG-g-PAM/SiO(2)）的化学、结构、纹理和流变特性表明，二氧化硅纳米粒子与聚合物基质之间具有更强的相互作用，对 Pb(2+)离子的最大吸附容量（Q(max)=537.634 mg g(-1)）明显高于其他报道的吸附剂。这种新型材料还可以作为一种有效的吸附剂，用于处理电池工业废水。吸附效率的提高可能是由于其具有更高的流体力学半径和流体力学体积。吸附动力学参数最符合伪二级模型。吸附平衡数据很好地符合朗缪尔等温线。热力学研究证实吸附是自发和吸热的。解吸研究证实了负载 Pb(2+)的再生效果。
