Organic Polymer Chemistry Research Laboratory, Department of Chemistry, Isfahan University of Technology, Isfahan 84156-83111, Islamic Republic of Iran; Research Institute for Nanotechnology and Advanced Materials, Isfahan University of Technology, Isfahan 84156-83111, Islamic Republic of Iran; Chemistry group, Pardis College, Isfahan University of Technology, Isfahan 84156-83111, Islamic Republic of Iran.
Chemistry group, Pardis College, Isfahan University of Technology, Isfahan 84156-83111, Islamic Republic of Iran.
Int J Biol Macromol. 2019 Jul 15;133:754-766. doi: 10.1016/j.ijbiomac.2019.04.129. Epub 2019 Apr 17.
In the current work, novel eco-friendly hydrogel nanocomposite biosorbents (ef-HNCs) made up from tragacanth gum and modified CaCO nanoparticles (CC NPs) were applied for the adsorption of methylene blue dye (MBD). A simple, fast, and safe method regarding green chemistry was used to prepare the ef-HNC, with the aid of ultrasound waves. The ef-HNCs were successfully characterized using several spectroscopic, microscopic, and analytical methods. The results of the adsorption showed that the surface modification of CC NPs has a great impact on the adsorption and increased it and showed this process is more compatible with linear pseudo-first-order kinetic and linear Langmuir isotherm models. Also, thermodynamic parameters showed that the adsorption is spontaneous, although with an increase in temperature the adsorption decreased. Also, the value of the enthalpy and Gibb's free energy showed physiochemical adsorption. The maximum adsorption capacity calculated from linear Langmuir models as 468.62 mg/g, which is an appropriate value for the natural polymer. Furthermore, phenomenological methods displayed that the film diffusion is the predominant mechanism of this adsorption process.
在当前的工作中，新型环保水凝胶纳米复合材料（ef-HNC）由刺槐豆胶和改性碳酸钙纳米粒子（CC NPs）组成，用于吸附亚甲基蓝染料（MBD）。采用简单、快速、安全的绿色化学方法，在超声波的辅助下制备 ef-HNC。使用多种光谱、显微镜和分析方法成功地对 ef-HNC 进行了表征。吸附结果表明，CC NPs 的表面改性对吸附有很大的影响，并增加了吸附量，表明该过程更符合线性拟一级动力学和线性朗缪尔等温线模型。此外，热力学参数表明，吸附是自发的，尽管随着温度的升高，吸附量会降低。焓和吉布斯自由能的值也表明了物理化学吸附。线性朗缪尔模型计算出的最大吸附容量为 468.62mg/g，这对于天然聚合物来说是一个合适的值。此外，唯象方法表明，薄膜扩散是该吸附过程的主要机制。
