Department of Chemistry, Bharathiar University, Coimbatore 641 046, Tamil Nadu, India.
PG and Research Department of Chemistry, D.K.M College for Women, Vellore 632 001, Tamil Nadu, India.
Int J Biol Macromol. 2017 Nov;104(Pt B):1495-1508. doi: 10.1016/j.ijbiomac.2017.04.116. Epub 2017 May 1.
In the present work, the maleic anhydride and methacrylic acid monomers were grafted one after another onto chitosan by using ceric ammonium nitrate as the initiator. The optimum conditions for grafting were studied by varying the initiator concentration, monomer concentration and reaction temperature. The synthesized grafted samples were subjected to various analytical techniques such as FTIR, XRD, TGA and DSC methods The proof of formation of graft copolymer was ascertained from the results of FTIR analysis and XRD studies. The TGA and DSC results conclude the highly thermally stable behavior of the prepared graft copolymer sample. The prepared graft copolymer was utilized for removing copper and lead from aqueous solutions and optimum adsorption parameters were evaluated under various pH, adsorbent dose, contact time and initial metal ion concentration. The adsorption and kinetic studies have been explained by Langmuir, Freundlich and pseudo - first order, second order and intra particle diffusion models. From the results, it was seen that Freundlich isotherm was best fit in the case of adsorption studies which followed pseudo second order kinetics. The obtained results showed that the chitosan-g-maleic anhydride-g-methacrylic acid copolymer was very efficient in removing the heavy metals copper and lead from aqueous solution.
在本工作中，采用硝酸铈铵作为引发剂，将马来酸酐和甲基丙烯酸单体先后接枝到壳聚糖上。通过改变引发剂浓度、单体浓度和反应温度研究了接枝的最佳条件。将合成的接枝样品进行了各种分析技术，如 FTIR、XRD、TGA 和 DSC 方法。从 FTIR 分析和 XRD 研究的结果证实了接枝共聚物的形成。TGA 和 DSC 结果表明，所制备的接枝共聚物具有很高的热稳定性。利用制备的接枝共聚物从水溶液中去除铜和铅，并在各种 pH 值、吸附剂用量、接触时间和初始金属离子浓度下评价最佳吸附参数。吸附和动力学研究通过 Langmuir、Freundlich 和拟一级、二级和内扩散模型进行了解释。结果表明，在吸附研究中，Freundlich 等温线最适合，动力学遵循拟二级动力学。所得结果表明，壳聚糖-g-马来酸酐-g-甲基丙烯酸共聚物从水溶液中去除重金属铜和铅非常有效。
