Department of Chemistry, University of Science & Technology, Bannu, 28100, Khyber Pakhtunkhwa, Pakistan.
Department of Chemistry, University of Science & Technology, Bannu, 28100, Khyber Pakhtunkhwa, Pakistan.
Chemosphere. 2022 Sep;302:134793. doi: 10.1016/j.chemosphere.2022.134793. Epub 2022 May 4.
In the current study, activated carbon (AC) was prepared from date palm using single step activation using boric acid as an activating agent. The synthesized AC was incorporated with alginate (AC-alginate (AC-alg)) to prepare membrane for adsorption of methylene blue (MB) in batch adsorption study. The prepared membrane was characterized using different types of analytical techniques such as FTIR, SEM, and TGA analysis. Adsorption of methylene blue dye from aqueous solution was carried out using AC-alg membrane in batch investigation. Various experimental parameters effecting the adsorption of MB on membrane such as initial pH of dye solution, contact time, concentration of dye solution and temperature were optimized to get maximum adsorption efficiency. Kinetics, isotherm and thermodynamics study was performed for dye adsorption. Pseudo-second order kinetic model and Langmuir adsorption isotherm were well fitted to the experimental data. The maximum adsorption capacity for MB adsorption was 666 mg/g found by Langmuir adsorption isotherm. Thermodynamic study revealed that the adsorption of MB on AC-alg membrane is spontaneous and an exothermic process. The experimental result confirmed that AC-alg membrane is a suitable and easily recoverable adsorbent to be used for efficient removal of MB and MB like other dyes.
在本研究中，使用硼酸作为活化剂，通过一步法活化从椰枣中制备活性炭（AC）。合成的 AC 与藻酸盐（AC-藻酸盐（AC-alg））结合，以制备用于吸附亚甲基蓝（MB）的膜，进行批量吸附研究。使用不同类型的分析技术，如 FTIR、SEM 和 TGA 分析，对制备的膜进行了表征。使用 AC-alg 膜在批处理研究中从水溶液中吸附亚甲基蓝染料。优化了初始染料溶液 pH 值、接触时间、染料溶液浓度和温度等各种实验参数，以获得最大吸附效率。对染料吸附进行了动力学、等温线和热力学研究。准二级动力学模型和 Langmuir 吸附等温线很好地拟合了实验数据。通过 Langmuir 吸附等温线，发现 MB 吸附的最大吸附容量为 666 mg/g。热力学研究表明，MB 在 AC-alg 膜上的吸附是自发的和放热过程。实验结果证实，AC-alg 膜是一种合适且易于回收的吸附剂，可用于有效去除 MB 和其他类似染料。
