Al-Yaari Mohammad, Saleh Tawfik A, Saber Osama
Chemical Engineering Department, King Faisal University P.O. Box 380 Al-Ahsa 31982 Saudi Arabia
Department of Chemistry, King Fahd University of Petroleum and Minerals Dhahran 31261 Saudi Arabia.
RSC Adv. 2020 Dec 23;11(1):380-389. doi: 10.1039/d0ra08882j. eCollection 2020 Dec 21.
This work aims at the synthesis of a polymer of poly-trimesoyl chloride and polyethyleneimine grafted on carbon fibers (PCF) derived from palm. The obtained PCF was characterized using Fourier-transform infrared spectroscopy (FTIR), scanning electron microscopy (SEM), and energy-dispersive X-ray spectroscopy (EDX) for its structural properties. The obtained PCF was then evaluated for the removal of mercury (Hg(ii)) from aqueous solutions using batch adsorption studies at four different temperatures (298, 308, 318, and 328 K). The experimental parameters such as initial concentration, pH, dosage, and contact time were optimized on the mercury adsorption. The percentage removal was 100% with an adsorbent dosage of 100 mg L at a pH between 5 and 7 and temperature of 298 K and thus kinetic, isotherm, and thermodynamic studies were performed under these conditions. By the Langmuir adsorption isotherm, the maximum adsorption capacity of Hg(ii) by PCF was 19.2 mg g. In addition, results fit the pseudo-second-order model, with > 0.99, to describe the adsorption kinetic mechanism. The adsorption process is spontaneous with an endothermic nature under the studied conditions.
这项工作旨在合成一种由聚间苯二甲酰氯和接枝在源自棕榈的碳纤维（PCF）上的聚乙烯亚胺组成的聚合物。使用傅里叶变换红外光谱（FTIR）、扫描电子显微镜（SEM）和能量色散X射线光谱（EDX）对所得的PCF进行结构特性表征。然后通过在四个不同温度（298、308、318和328 K）下进行的批量吸附研究，评估所得PCF从水溶液中去除汞（Hg(ii)）的性能。对汞吸附的初始浓度、pH值、剂量和接触时间等实验参数进行了优化。在pH值为5至7、温度为298 K且吸附剂剂量为100 mg/L时，去除率为100%，因此在这些条件下进行了动力学、等温线和热力学研究。根据朗缪尔吸附等温线，PCF对Hg(ii)的最大吸附容量为19.2 mg/g。此外，结果符合伪二级模型，相关系数>0.99，以描述吸附动力学机制。在所研究的条件下，吸附过程是自发的，具有吸热性质。
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