Department of Chemical Engineering, Ayatollah Amoli Branch, Islamic Azad University, Amol, Iran.
Department of Chemical Engineering, Ayatollah Amoli Branch, Islamic Azad University, Amol, Iran.
Int J Biol Macromol. 2021 Jan 31;168:428-441. doi: 10.1016/j.ijbiomac.2020.12.067. Epub 2020 Dec 10.
Discharges of dyes-containing wastewater from industries have created global concern. Removal of these substances from aqueous solution is very important and essential. Magnetic chitosan coated with ZIF-8 was prepared successfully and used to eliminate cationic dye malachite green in various conditions. To find the effectiveness of ZIF-8 towards malachite green removal, their surface interaction was investigated using density functional theory (DFT) calculations for the first time which the results show physisorption of malachite green on ZIF-8. The characteristics of adsorbent synthesized were evaluated using XRD, FTIR, FE-SEM, TEM and TGA analysis. In addition, the influence of different parameters on malachite green removal was investigated. The results showed that pH = 7, 40 mg of adsorbent dosage, 10 mg/L initial concentration, 40 min contact time and temperature of 25 °C were obtained as an optimum values for FeO@chitosan@ZIF-8. The equilibrium data were in good agreement with the Langmuir model having maximum capacity (q) value of 3.282 mg/g. The experimental data revealed that the adsorption process obeyed to pseudo-second order kinetic model. It was concluded that FeO@chitosan@ZIF-8 can be utilized as an efficient and effective adsorbent for removal of toxic malachite green dye from aqueous solution.
工业染料废水的排放引起了全球关注。从水溶液中去除这些物质非常重要。成功制备了包覆 ZIF-8 的磁性壳聚糖，并将其用于在各种条件下去除阳离子染料孔雀石绿。为了研究 ZIF-8 对孔雀石绿去除的有效性，首次使用密度泛函理论（DFT）计算对其表面相互作用进行了研究，结果表明孔雀石绿在 ZIF-8 上发生物理吸附。使用 XRD、FTIR、FE-SEM、TEM 和 TGA 分析对合成的吸附剂的特性进行了评估。此外，还研究了不同参数对孔雀石绿去除的影响。结果表明，pH=7、吸附剂用量 40mg、初始浓度 10mg/L、接触时间 40min 和温度 25°C 为 FeO@chitosan@ZIF-8 的最佳值。平衡数据与最大容量（q）值为 3.282mg/g 的 Langmuir 模型吻合较好。实验数据表明，吸附过程符合拟二级动力学模型。因此，可以得出结论，FeO@chitosan@ZIF-8 可以用作从水溶液中去除有毒孔雀石绿染料的有效和高效吸附剂。
