Nithya R, Gomathi Thandapani, Sudha P N, Venkatesan Jayachandran, Anil Sukumaran, Kim Se-Kwon
P.G and Research Department of Chemistry, D.K.M College for Women, Vellore, Tamil Nadu, India.
P.G and Research Department of Chemistry, D.K.M College for Women, Vellore, Tamil Nadu, India.
Int J Biol Macromol. 2016 Jun;87:545-54. doi: 10.1016/j.ijbiomac.2016.02.076. Epub 2016 Mar 4.
The present work deals with the preparation of the novel sorbent, glutaraldehye crosslinked silica gel/chitosan-g-poly(butyl acrylate) (Cs-g-PBA/SG) nanocomposite by sol-gel method for removal of toxic chromium ion. Prepared nanosorbent was then characterized by FTIR, XRD, DLS, SEM, BET isotherm for its formation and suitability. Its sorption capacity and sorption isotherms were brought under batch mode to suit the optimal parameters viz., contact time, pH, adsorbent dose and initial metal ion concentration which influence the sorption. The theoretical modeling such as Langmuir and Freundlich isotherm adsorption were applied to describe isotherm constants. Equilibrium data agreed well with the Langmuir isotherm model (R(2)=0.9763) with maximum adsorption capacity of 55.71 (mg/g). The kinetic studies showed that the adsorption follows the pseudo-second-order kinetics (R(2)=0.9999). From the results, it was concluded that Cs-g-PBA/SG nanocomposite is an excellent biosorbent for Cr removal from wastewater.
本研究通过溶胶 - 凝胶法制备了新型吸附剂戊二醛交联硅胶/壳聚糖 - g - 聚（丙烯酸丁酯）（Cs - g - PBA/SG）纳米复合材料，用于去除有毒铬离子。然后通过傅里叶变换红外光谱（FTIR）、X射线衍射（XRD）、动态光散射（DLS）、扫描电子显微镜（SEM）、BET等温线对制备的纳米吸附剂进行表征，以确定其形成情况和适用性。在分批模式下研究了其吸附容量和吸附等温线，以确定影响吸附的最佳参数，即接触时间、pH值、吸附剂剂量和初始金属离子浓度。应用朗缪尔（Langmuir）和弗伦德里希（Freundlich）等温线吸附等理论模型来描述等温线常数。平衡数据与朗缪尔等温线模型吻合良好（R² = 0.9763），最大吸附容量为55.71（mg/g）。动力学研究表明吸附遵循准二级动力学（R² = 0.9999）。结果表明，Cs - g - PBA/SG纳米复合材料是一种从废水中去除铬的优良生物吸附剂。
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