Department of Chemical Engineering, Indian Institute of Technology Guwahati, India.
Department of Chemical Engineering, Indian Institute of Technology Guwahati, India; Department of Chemical Engineering, Institute of Chemical Technology Marathwada Campus, Jalna, India.
Carbohydr Polym. 2021 Mar 15;256:117520. doi: 10.1016/j.carbpol.2020.117520. Epub 2020 Dec 16.
Xylan and gelatin-based hydrogels are prepared in different molar ratios using ethylene glycol diglycidyl ether cross-linker. The hydrogels are characterized by Fourier transform infrared spectroscopy, morphology, thermal analysis, and swelling ratio. The rheological experiment shows the gels are cross-linked successfully by revealing the viscoelastic nature. The xylan-gelatin gel synthesized in a 5:1 molar ratio (hence XG5) has higher storage modulus, gelation temperature, and time among the synthesized gels. The adsorption behaviour of the synthesized gels is studied for the removal of methylene blue, by varying adsorbate concentration, pH, and temperature. Among the synthesized hydrogels, XG5 shows the highest adsorption capacity of 26.04 mg g at pH = 5.84 and 25 °C. The kinetics of the adsorption process follows the pseudo-second-order model, and monolayer adsorption is adequately represented by the Langmuir isotherm model. The adsorption process is established as spontaneous, exothermic, and physisorption from the thermodynamic parameters.
使用乙二醇二缩水甘油醚交联剂，以不同的摩尔比制备木聚糖和明胶基水凝胶。通过傅里叶变换红外光谱、形态、热分析和溶胀比对水凝胶进行了表征。流变学实验表明，通过揭示粘弹性，凝胶成功交联。在合成的凝胶中，摩尔比为 5:1 的木聚糖-明胶凝胶（即 XG5）具有较高的储能模量、胶凝温度和时间。通过改变吸附质浓度、pH 值和温度，研究了合成凝胶对亚甲基蓝的吸附行为。在合成的水凝胶中，XG5 在 pH = 5.84 和 25°C 时表现出最高的吸附容量 26.04mg g。吸附过程的动力学遵循准二级模型，单层吸附由朗缪尔等温线模型充分表示。从热力学参数来看，吸附过程被确定为自发、放热和物理吸附。
