Department of Chemistry, D.K.M. College for Women, Vellore, Tamil Nadu, India.
Department of Chemistry, D.K.M. College for Women, Vellore, Tamil Nadu, India.
Int J Biol Macromol. 2017 Nov;104(Pt B):1469-1482. doi: 10.1016/j.ijbiomac.2017.05.111. Epub 2017 May 21.
The present work was aimed to investigate the efficiency of novel chitosan oligosaccharide-graft-maleic anhydride(COS-g-MAH)/Polyvinyl alcohol (PVA)/silk fibroin (SF) composite for removing the toxic heavy metal lead (II) ion from aqueous solution by batch adsorption studies. Initially the chitosan oligosaccharide-graft-maleic anhydride copolymer has been prepared by utilizing ceric ammonium nitrate as an initiator and the optimised graft copolymer was then used for synthesizing COS-g-MAH/PVA/SF composite. The prepared samples were analyzed through FTIR and XRD studies. The FTIR results indicate that the grafted chitosan oligosaccharide copolymer was mixed homogeneously with silk fibroin and polyvinyl alcohol through intermolecular hydrogen bonding. The XRD results elucidate the changes in the crystalline behaviour of the prepared COS-g-MAH/PVA/silk fibroin composite. Both FTIR and XRD results revealed a strong interaction among COS-g-MAH, PVA and silk fibroin components. To evaluate the adsorption potential of the synthesized composite, the parameters such as pH, adsorbent dosage, contact time and initial Pb(II)ion concentration was investigated. The adsorption isotherms of Pb(II) could be described very well by Langmuir model and the kinetic results revealed that pseudo second order kinetics shows a better fit. This work provides a practical and high-efficient method for water treatment at moderate concentration of toxic heavy metals.
本工作旨在通过批量吸附研究，考察新型壳聚糖寡糖接枝马来酸酐（COS-g-MAH）/聚乙烯醇（PVA）/丝素（SF）复合材料去除水溶液中有毒重金属铅（II）离子的效率。首先，利用硝酸铈铵作为引发剂制备壳聚糖寡糖接枝马来酸酐共聚物，然后优化接枝共聚物用于合成 COS-g-MAH/PVA/SF 复合材料。通过 FTIR 和 XRD 研究对制备的样品进行了分析。FTIR 结果表明，接枝的壳聚糖寡糖共聚物通过分子间氢键均匀混合在丝素和聚乙烯醇中。XRD 结果阐明了制备的 COS-g-MAH/PVA/丝素复合材料结晶行为的变化。FTIR 和 XRD 结果均表明 COS-g-MAH、PVA 和丝素成分之间存在强烈的相互作用。为了评估合成复合材料的吸附潜力，考察了 pH 值、吸附剂用量、接触时间和初始 Pb（II）离子浓度等参数。Pb（II）的吸附等温线可以很好地用朗缪尔模型描述，动力学结果表明准二级动力学拟合更好。这项工作为处理中等浓度有毒重金属的水提供了一种实用且高效的方法。
