Bakry Ayyob M, Amri Nasser, Adly Mina Shawky, Alamri Abdullah A, Salama Reda S, Jabbari Abdulmajeed M, El-Shall M Samy, Awad Fathi S
Department of Chemistry, Faculty of Science, Jazan University, P.O. Box2079, 45142, Jazan, Saudi Arabia.
Chemistry Department, Faculty of Science, Mansoura University, Mansoura, 35516, Egypt.
Sci Rep. 2024 Aug 14;14(1):18848. doi: 10.1038/s41598-024-66323-3.
A novel chelating adsorbent based on (3-iminodiacetic acid) propyltriethoxysilane graphene oxide (IAT-GO) has been developed, showing exceptional promise for capturing lead. IAT-GO is made by combining a high-surface-area graphene oxide with a specially designed chelating ligand, which can selectively and efficiently remove lead. The synthesis of IAT-GO involves a two-step progression. In the first step, covalent bonds form between graphene oxide and (3-aminopropyl)-triethoxysilane (AT) through hydrolysis, condensation, and epoxide ring opening reactions. In the second step, nucleophilic substitution reactions occur between the primary amines and chloroacetic acid (CAA). A comprehensive suite of characterization techniques, including XPS, UV-Vis, XRD, Raman, FTIR, TEM, and SEM, provides detailed insights into the IAT-GO adsorbent's chemical composition and physical form, elucidating its intricate structure and morphology. Optimizing the experimental conditions for using the adsorbent material to remove Pb(II) ions from contaminated water revealed a maximum adsorption capacity of 124.0 mg/g at pH 5 and 30 min. The IAT-GO displays high selectivity for Pb(II) in a mixture of six metal ions containing 100 ppm of each one. Moreover, the IAT-GO shows 100% removal of Pb(II) for concentrations lower than 50 ppm. The excellent fit of the experimental data with the Langmuir adsorption isotherm and pseudo-second-order kinetic models (R2 > 99%) indicates that Pb(II) ion uptake onto the IAT-GO surface occurs via the monolayer formation of mercury ions. IAT-GO demonstrates exceptional potential as an innovative adsorbent for lead-contaminated water. Nitric acid (0.4 M) effectively regenerates the material, while its reusability remains impressive even after five cycles (> 97% removal efficiency). Therefore, this study highlights the development of a groundbreaking material, IAT-GO, with exceptional potential for remediating lead-contaminated water. Its high efficiency, selectivity, reusability, and cost-effectiveness make it a promising candidate for real-world applications.
一种基于（3-亚氨基二乙酸）丙基三乙氧基硅烷氧化石墨烯（IAT-GO）的新型螯合吸附剂已被开发出来，在捕获铅方面显示出巨大的潜力。IAT-GO是通过将高比表面积的氧化石墨烯与一种特殊设计的螯合配体结合而成，它能够选择性且高效地去除铅。IAT-GO的合成包括两步过程。第一步，氧化石墨烯与（3-氨丙基）三乙氧基硅烷（AT）通过水解、缩合和环氧开环反应形成共价键。第二步，伯胺与氯乙酸（CAA）之间发生亲核取代反应。一系列综合的表征技术，包括XPS、紫外可见光谱、XRD、拉曼光谱、傅里叶变换红外光谱、透射电子显微镜和扫描电子显微镜，提供了关于IAT-GO吸附剂化学成分和物理形态的详细见解，阐明了其复杂的结构和形貌。优化使用吸附剂材料从受污染水中去除Pb(II)离子的实验条件后发现，在pH为5和30分钟时，最大吸附容量为124.0 mg/g。IAT-GO在含有六种浓度均为100 ppm的金属离子混合物中对Pb(II)具有高选择性。此外，对于浓度低于50 ppm的Pb(II)，IAT-GO的去除率为100%。实验数据与朗缪尔吸附等温线和准二级动力学模型的良好拟合（R2＞99%）表明，Pb(II)离子在IAT-GO表面的吸附是通过汞离子的单层形成实现的。IAT-GO作为一种用于处理含铅污染水的创新吸附剂具有巨大潜力。硝酸（0.4 M）能有效再生该材料，即使经过五个循环，其可重复使用性仍然令人印象深刻（去除效率＞97%）。因此，本研究突出了一种开创性材料IAT-GO的开发，它在修复含铅污染水方面具有巨大潜力。其高效率、选择性、可重复使用性和成本效益使其成为实际应用中一个有前景的候选材料。
