Department of Chemical Engineering, Quchan University of Technology, Quchan, Iran.
Department of Chemical Engineering, Quchan University of Technology, Quchan, Iran.
Int J Biol Macromol. 2019 Jan;121:1126-1134. doi: 10.1016/j.ijbiomac.2018.10.137. Epub 2018 Oct 18.
In the present study, a novel xanthate modified magnetic chitosan, with AlO/FeO core-shell particle as magnetic core, was synthesized, characterized and used as an efficient adsorbent for the removal of cationic azo dye models. The adsorption study demonstrated that the xanthate modification of magnetic chitosan significantly improves its adsorption activity toward methylene blue and safranin O. The optimized adsorbent dosage was obtained 0.8 mg g and the process was found to be optimal in the wide pH range of 4-11. The kinetic data were evaluated well utilizing the pseudo-second-order model and it was shown that the adsorption kinetics was controlled by film diffusion and intra-particle diffusion, simultaneously. Also, the equilibrium data were fitted by Langmuir (R > 0.95) and very well correlated with Sips isotherm (R > 0.990) model. The maximum adsorption capacities were obtained 197.8 and 169.8 mg g toward the methylene blue and Safranin O at 35 °C respectively. The thermodynamic analysis confirmed the endothermic, spontaneous and irreversible adsorption process.
在本研究中，合成了一种新型的黄原酸酯改性磁性壳聚糖，以 AlO/FeO 核壳颗粒为磁性核，并对其进行了表征，将其用作去除阳离子偶氮染料模型的有效吸附剂。吸附研究表明，磁性壳聚糖的黄原酸酯改性显著提高了其对亚甲蓝和碱性红的吸附活性。优化后的吸附剂用量为 0.8 mg/g，发现该过程在 4-11 的宽 pH 范围内最佳。通过准二级模型很好地评估了动力学数据，表明吸附动力学同时受到膜扩散和颗粒内扩散的控制。此外，平衡数据通过 Langmuir（R > 0.95）很好地拟合，并与 Sips 等温线（R > 0.990）模型很好地相关。在 35°C 下，对亚甲蓝和碱性红的最大吸附容量分别为 197.8 和 169.8 mg/g。热力学分析证实了吸附过程是吸热、自发和不可逆的。
