Omer Ahmed M, El-Sayed Mohamed, Abd El-Monaem Eman M, El-Subruiti Gehan M, Eltaweil Abdelazeem S
Polymer Materials Research Department, Advanced Technology and New Materials Research Institute (ATNMRI), City of Scientific Research an d Technological Applications (SRTA - City), New Borg El -Arab City, P. O. Box: 21934, Alexandria, Egypt.
Chemistry Department, Faculty of Science, Alexandria University, Alexandria, Egypt; The Egyptian Ethylene and Derivatives Company (ETHYDCO), Egypt.
Int J Biol Macromol. 2023 Dec 31;253(Pt 7):127437. doi: 10.1016/j.ijbiomac.2023.127437. Epub 2023 Oct 13.
The aggravated problem of lead pollution, especially in aquatic environments, necessitates the development of eminent adsorbents that could radically solve this environmental problem. Hence, a new composite was constructed based on iota carrageenan (i.Carr), graphene oxide (GO) and magnetite (FeO) for removing noxious Pb ions. The GO@FeO-i.Carr composite was characterized by VSM, SEM, XPS, XRD, FTIR and Zeta potential. The removal of Pb ions attained a quick equilibrium of almost 30 min with a removal efficiency reaching 93.68 %. The removal of Pb was boosted significantly, in the order of GO@FeO-i.Carr(1:1) > GO@FeO-i.Carr(1:3) > GO@FeO-i.Carr(3:1). Moreover, acquired experimental data fitted the pseudo 2nd order kinetic model and Freundlich isotherm model with a maximal monolayer adsorption capacity reached 440.05 mg/g. Notably, after five adsorption runs, the composite maintained its removal efficiency exceeding 74 %. The assumed adsorption mechanisms of Pb onto GO@FeO-i.Carr were complexation, precipitation, Lewis acid-base, and electrostatic attraction forces. Overall, the GO@FeO-i.Carr composite elucidated the auspicious adsorbent criteria, comprising fast adsorption with high performance, ease-separation and tolerable recyclability, advising its feasible use to decontaminate water bodies from hazardous heavy metals.
铅污染问题日益严重，尤其是在水生环境中，因此需要开发出卓越的吸附剂来从根本上解决这一环境问题。为此，基于iota-卡拉胶（i.Carr）、氧化石墨烯（GO）和磁铁矿（FeO）构建了一种新型复合材料，用于去除有害的铅离子。通过振动样品磁强计（VSM）、扫描电子显微镜（SEM）、X射线光电子能谱（XPS）、X射线衍射（XRD）、傅里叶变换红外光谱（FTIR）和Zeta电位对GO@FeO-i.Carr复合材料进行了表征。铅离子的去除在近30分钟内迅速达到平衡，去除效率达到93.68%。铅的去除率显著提高，顺序为GO@FeO-i.Carr(1:1) > GO@FeO-i.Carr(1:3) > GO@FeO-i.Carr(3:1)。此外，实验数据符合准二级动力学模型和Freundlich等温线模型，最大单层吸附容量达到440.05 mg/g。值得注意的是，经过五次吸附循环后，该复合材料的去除效率仍保持在74%以上。推测铅在GO@FeO-i.Carr上的吸附机制包括络合、沉淀、Lewis酸碱和静电吸引力。总体而言，GO@FeO-i.Carr复合材料符合理想吸附剂的标准，包括快速高效吸附、易于分离和良好的可回收性，表明其可用于去除水体中的有害重金属。
