Ullah Nasim, Ali Zarshad, Khan Amir Sada, Adalat Bushra, Nasrullah Asma, Khan Sher Bahadar
Department of Chemistry, Hazara University Mansehra 21120 Khyber Pakhtunkhwa Pakistan
Department of Chemistry, University of Science and Technology Bannu 28100 Khyber Pakhtunkhwa Pakistan.
RSC Adv. 2024 Jan 2;14(1):211-221. doi: 10.1039/d3ra07554k.
A hydrogel membrane was prepared using activated carbon and sodium dodecyl sulphate modified montmorillonite clay incorporated into sodium alginate polymer. The activated carbon was prepared from a locally available susbine plant. The physiochemical characteristics of the synthesized hydrogel membrane were investigated using FTIR, SEM, EDX, and TGA techniques. The performance of the membrane was evaluated as an adsorbent by methyl red adsorption from water. The adsorption behavior of the hydrogel membrane was investigated under varying conditions of pH (2-10), membrane dose (0.0025-0.015 mg g), equilibrium adsorption time (30-360 minutes), solution temperature (25-45 °C) and dye concentration (100-500 mg L). The maximum adsorption capacity of the hydrogel membrane was 248.13 mg g. The kinetics of methyl red adsorption on hydrogel membrane best followed the pseudo-second order (PSO). The equilibrium adsorption results suggested that it obeyed the Freundlich isotherm very closely ( = 0.994). The thermodynamics of methyl red adsorption on the hydrogel membrane revealed that the adsorption was spontaneous (Δ° = 16.15 kJ K mol), favorable (Δ° = -3.51 kJ mol), and endothermic (Δ° = -1.48 kJ mol) in nature. These investigations suggested that the fabricated hydrogel membrane could be suitably used for methyl red adsorption from the solution.
使用活性炭和十二烷基硫酸钠改性的蒙脱石粘土与海藻酸钠聚合物混合制备了一种水凝胶膜。活性炭由当地可得的苏斯宾植物制备。采用傅里叶变换红外光谱（FTIR）、扫描电子显微镜（SEM）、能谱仪（EDX）和热重分析仪（TGA）技术研究了合成水凝胶膜的物理化学特性。通过从水中吸附甲基红来评估该膜作为吸附剂的性能。在不同的pH值（2 - 10）、膜剂量（0.0025 - 0.015 mg/g）、平衡吸附时间（30 - 360分钟）、溶液温度（25 - 45℃）和染料浓度（100 - 500 mg/L）条件下研究了水凝胶膜的吸附行为。水凝胶膜的最大吸附容量为248.13 mg/g。甲基红在水凝胶膜上的吸附动力学最符合准二级动力学（PSO）。平衡吸附结果表明它非常符合弗伦德利希等温线（R² = 0.994）。甲基红在水凝胶膜上吸附的热力学表明吸附是自发的（ΔG° = 16.15 kJ K⁻¹ mol⁻¹）、有利的（ΔH° = -3.51 kJ mol⁻¹）且本质上是吸热的（ΔS° = -1.48 kJ mol⁻¹）。这些研究表明所制备的水凝胶膜可适用于从溶液中吸附甲基红。
