Department of Post-Graduate Studies & Research in Chemistry, Mangalore University, Mangalagangothri 574199 (DK), Karnataka, India.
Department of Post-Graduate Studies & Research in Chemistry, Mangalore University, Mangalagangothri 574199 (DK), Karnataka, India.
Int J Biol Macromol. 2020 Jul 1;154:739-750. doi: 10.1016/j.ijbiomac.2020.03.107. Epub 2020 Mar 13.
A polymer-clay hybrid composite material, (KG-g-PMETAC/MMT) has been synthesised by microwave assisted free radical polymerisation using modified karaya gum and clay mineral and was characterised by various techniques. The karaya gum has been modified by grafting with (2-methacryloyloxy ethyl) trimethyl ammonium chloride prior to making the clay composite. Montmorillonite was used as the clay component. The nanocomposite exhibited pH responsive swelling behaviour. The maximum swelling of 42.23 g/g was observed at pH 7.0 and minimum of 17.28 g/g was noticed at pH 9.2. The water transport mechanism was Fickian in nature and followed second order kinetic model. The adsorption capacities of the nanocomposite for the chosen cationic dyes, methylene blue (MB), toluidine blue (TB), crystal violet (CV) and azure B (AB) were found to 155.85, 149.64, 137.77 and 128.78 mg/g respectively. The dye adsorption was found to be a pseudo-first order kinetic process. The adsorption data is found to best fit with Freundlich isotherm model indicating heterogeneous adsorption and possibility of multilayer formation. Negative value of ΔG indicated the spontaneous nature of adsorption process at the temperatures under study. The reusability studies indicated that desorption of about 70% of the adsorbed dyes can be achieved after two consecutive cycles.
一种聚合物-粘土杂化复合材料（KG-g-PMETAC/MMT）已通过微波辅助自由基聚合合成，使用改性卡拉胶和粘土矿物，并通过各种技术进行了表征。在制备粘土复合材料之前，卡拉胶已通过接枝（2-甲基丙烯酰氧基乙基）三甲基氯化铵进行了改性。蒙脱土被用作粘土成分。纳米复合材料表现出 pH 响应的溶胀行为。在 pH 7.0 时观察到最大溶胀 42.23 g/g，在 pH 9.2 时观察到最小溶胀 17.28 g/g。水传输机制本质上是菲克型，并遵循二级动力学模型。纳米复合材料对所选阳离子染料亚甲基蓝（MB）、甲苯胺蓝（TB）、结晶紫（CV）和天青 B（AB）的吸附容量分别为 155.85、149.64、137.77 和 128.78 mg/g。染料吸附被发现是一个准一级动力学过程。吸附数据最符合 Freundlich 等温线模型，表明吸附是多相的，并且可能形成多层。ΔG 的负值表明在研究温度下吸附过程是自发的。可重复使用性研究表明，在两个连续循环后，约 70%的吸附染料可以解吸。
