Department of Post-Graduate Studies and Research in Chemistry, Mangalore University, Mangalagangothri-574199 (D.K.), Karnataka, India.
Department of Post-Graduate Studies and Research in Chemistry, Mangalore University, Mangalagangothri-574199 (D.K.), Karnataka, India.
Int J Biol Macromol. 2021 Dec 15;193(Pt B):2232-2242. doi: 10.1016/j.ijbiomac.2021.11.055. Epub 2021 Nov 13.
A porous hydrogel nanocomposite has been made by grafting poly(itaconic acid) on the polysaccharide, gum ghatti and by embedding magnetite nanoparticles in the copolymer gel matrix. This novel functional material Ggh-g-PIA/FeO was characterized by FTIR, TGA, SEM, EDS, XRD, BET, Zeta potential measurements and VSM techniques. The nanocomposite possesses mesoporous structure with high surface area and exhibits super-paramagnetic behavior due to the presence of magnetite nanoparticles. The hydrogel nanocomposite was evaluated as an adsorbent material for removal of dyes and divalent metal ions. Significant adsorption capacities of 410.2, 387.6, 416.5 and 401.4 mg g towards methylene blue, rhodamine 6G, Cu (II) and Hg (II) ions respectively were observed. The adsorption isotherms were well described by the Freundlich isotherm model and kinetic studies demonstrated the adsorption to be a pseudo second order kinetic process. Intraparticle diffusion model suggested adsorption to occur by a multi-step diffusion process. Thermodynamic studies indicated a spontaneous and endothermic adsorption. Further, the desorption study indicated the possibility of successful regeneration of the adsorbent. A high removal efficiency, recyclability, convenient recovery after use due to the magnetic nature makes this polysaccharide based nanocomposite an environment friendly adsorbent material for water purification.
一种多孔水凝胶纳米复合材料是通过将聚（衣康酸）接枝到多糖、瓜尔胶上，并将磁性纳米粒子嵌入共聚物凝胶基质中而制成的。这种新型功能材料 Ggh-g-PIA/FeO 采用傅里叶变换红外光谱（FTIR）、热重分析（TGA）、扫描电子显微镜（SEM）、能谱（EDS）、X 射线衍射（XRD）、BET 比表面积测试、Zeta 电位测量和振动样品磁强计（VSM）技术进行了表征。纳米复合材料具有介孔结构，比表面积高，并由于存在磁性纳米粒子而表现出超顺磁性。该水凝胶纳米复合材料被评估为一种用于去除染料和二价金属离子的吸附剂材料。观察到对亚甲蓝、罗丹明 6G、Cu（II）和 Hg（II）离子的吸附容量分别为 410.2、387.6、416.5 和 401.4mg/g。吸附等温线很好地符合 Freundlich 等温模型，动力学研究表明吸附是一个伪二级动力学过程。内扩散模型表明吸附是通过多步扩散过程发生的。热力学研究表明吸附是自发和吸热的。此外，解吸研究表明吸附剂具有成功再生的可能性。由于其磁性，这种基于多糖的纳米复合材料具有高去除效率、可回收性、使用后方便回收等优点，是一种用于水净化的环保型吸附剂材料。
