Organic Polymer Chemistry Research Laboratory, Department of Chemistry, Isfahan University of Technology, Isfahan 84156-83111, Islamic Republic of Iran.
Organic Polymer Chemistry Research Laboratory, Department of Chemistry, Isfahan University of Technology, Isfahan 84156-83111, Islamic Republic of Iran.
Int J Biol Macromol. 2021 Sep 30;187:319-324. doi: 10.1016/j.ijbiomac.2021.07.105. Epub 2021 Jul 20.
Today, hydrogels opened new windows to the high-tech due to their amazing features. Thus, we applied hydrogel nanocomposite (HNC) made of tragacanth gum (a kind of polysaccharide) and CaCO nanoparticles to remove methylene blue dye (MBD) from the water solution. We used nonlinear and linear isotherms and kinetics as well as thermodynamics to uncover the adsorption mechanism. The results showed that the hydrogel could remove 80% of MBD. Besides, the linear form of the pseudo-second-order kinetic model fits well with the results, showing chemical interactions. We found that this process follows both Sips and Redlich-Peterson models by applying nonlinear and linear isotherm models. The maximum adsorption capacities from nonlinear and linear Sips were 1401 and 2145 mg/g, respectively. Based on the thermodynamic equations, the adsorption of MBD onto HNC was physiochemical and exothermic. According to the phenomenological calculations, diffusion from the bulk (or film diffusion, D = 1.2 × 10 cm/s) is the primary mechanism.
如今，由于其惊人的特性，水凝胶为高科技开辟了新的窗口。因此，我们应用了由黄蓍胶（一种多糖）和 CaCO3 纳米粒子制成的水凝胶纳米复合材料（HNC）来从水溶液中去除亚甲蓝染料（MBD）。我们使用非线性和线性等温线和动力学以及热力学来揭示吸附机制。结果表明，水凝胶可以去除 80%的 MBD。此外，准二级动力学模型的线性形式与结果吻合较好，表明存在化学相互作用。通过应用非线性和线性等温线模型，我们发现该过程遵循 Sips 和 Redlich-Peterson 模型。从非线性和线性 Sips 模型获得的最大吸附容量分别为 1401 和 2145 mg/g。根据热力学方程，MBD 吸附到 HNC 是物理化学和放热的。根据唯象学计算，从主体（或膜扩散，D=1.2×10-5 cm/s）的扩散是主要的机制。
