Al-Yaari Mohammed, Saleh Tawfik A
Chemical Engineering Department, King Faisal University, P.O. Box 380, Al-Ahsa 31982, Saudi Arabia.
Chemistry Department, King Fahd University of Petroleum and Minerals, Dhahran 31261, Saudi Arabia.
ACS Omega. 2022 Apr 18;7(17):14820-14831. doi: 10.1021/acsomega.2c00274. eCollection 2022 May 3.
The contamination of groundwater by mercury (Hg) is a serious global threat, and its removal is of great importance. Activated carbon (AC) is considered a very promising adsorbent to remove Hg from water systems. However, specific functional groups can be added to AC to enhance its adsorption efficiency. In this work, AC was synthesized from palm shells and grafted with a copolymer of acrylamide and methacrylic acid to produce a polyacrylate-modified carbon (PAMC) composite. The synthesized adsorbent (PAMC) was characterized by Fourier-transform infrared (FTIR) spectroscopy, scanning electron microscopy (SEM), electron dispersive X-ray (EDX) spectroscopy, and Brunauer-Emmett-Teller (BET) analysis. PAMC was then evaluated for Hg removal from aqueous solutions, and the adsorption efficiency was optimized under several parameters (pH, contact time, and PAMC dosage). Kinetic, isotherm, and thermodynamic investigations were performed to gain a further understanding of the adsorption properties. The adsorption data were best fitted by pseudo-second-order and Redlich-Peterson models. Also, the thermodynamic investigation confirmed the spontaneity and the endothermic nature of the Hg adsorption process over PAMC. The maximum adsorption capacity ( ) of PAMC was found to be 76.3 mg/g ,which is relatively higher than some activated carbon-based adsorbents. Therefore, PAMC offers a potential promise for wastewater treatment due to its fast and high uptake removal capacity in addition to the cheap and environmentally friendly activated carbon source.
汞（Hg）对地下水的污染是一个严重的全球威胁，去除汞污染至关重要。活性炭（AC）被认为是从水系统中去除汞的一种非常有前景的吸附剂。然而，可以向活性炭中添加特定的官能团以提高其吸附效率。在本研究中，以棕榈壳为原料合成了活性炭，并接枝丙烯酰胺和甲基丙烯酸的共聚物，制备了聚丙烯酸酯改性碳（PAMC）复合材料。采用傅里叶变换红外光谱（FTIR）、扫描电子显微镜（SEM）、电子能谱（EDX）和比表面积分析仪（BET）对合成的吸附剂（PAMC）进行了表征。然后评估了PAMC对水溶液中汞的去除效果，并在几个参数（pH值、接触时间和PAMC用量）下对吸附效率进行了优化。进行了动力学、等温线和热力学研究，以进一步了解吸附特性。吸附数据最符合准二级动力学模型和Redlich-Peterson模型。此外，热力学研究证实了PAMC对汞的吸附过程具有自发性和吸热性。PAMC的最大吸附容量为76.3 mg/g，相对高于一些基于活性炭的吸附剂。因此，PAMC因其快速、高效的吸附去除能力以及廉价且环保的活性炭源，为废水处理提供了潜在的前景。
