Mogharbel Roaa T, Alaysuy Omaymah, S Alatawi Ibrahim Saleem, Alshammari Nadiyah M, Sallam Sahar, Almutairi Abeer M, Al-Bonayan Ameena Mohsen, El-Metwaly Nashwa M
Department of Chemistry, College of Science, Northern Border University, P.O. Box.1321, Arar 91431, Saudi Arabia.
Department of Chemistry, College of Science, University of Tabuk, Tabuk 47512, Saudi Arabia.
ACS Omega. 2025 Apr 8;10(15):15096-15115. doi: 10.1021/acsomega.4c10666. eCollection 2025 Apr 22.
This research investigated the efficient removal of cationic Basic red 46 (BR46) dye from aqueous solutions, by means of cerium metal-organic frameworks (Ce-MOF) functionalized with glutamic acid to create NH-Ce-MOF. The NH-Ce-MOF was easily produced through a postsynthesis functionalization strategy and extensively analyzed through numerous methods with X-ray diffraction (XRD), scanning electron microscopy (SEM), X-ray photoelectron spectroscopy (XPS), energy dispersive X-ray (EDX), and N adsorption/desorption isotherm. The findings revealed that the synthesized adsorbent had a high surface area of 1158.8 m/g, a pore size of 1.511 nm, and a pore volume of 0.875 cm/g. Upon adsorption of the BR46 dye, the surface area decreased to 872.6 m/g, the pore size reduced to 1.18 nm, and the pore volume released to 0.53 cm/g. The decreases in surface area, pore size, and volume demonstrate the material's strong ability to adsorb substances, as the dye molecules can fill the tiny pores. They exhibited an increased adsorption capability of 454.8 mg/g. The Langmuir isotherm and pseudo-second-order kinetic models performed the best at simulating adsorption isotherm and kinetic curves, respectively. The exhibition of chemisorption and adsorption energy of 28.4 kJ/mol was supported by various adsorption driving forces, including hydrogen bonding, electrostatic interaction, π-π conjugation, pore filling, and van der Waals force. After conducting thorough research on the impact of temperature, it was established that the adsorption procedure is both endothermic, indicated by a positive Δ° of 83.7 kJ/mol.K, and spontaneous, as confirmed by the increase in negativity of Δ° with rising temperatures. Additionally, the increase in randomness with increasing temperatures is evident in the Δ° value of 289.32 J/mol. Employed Box-Behnken design (BBD) and response surface methodology (RSM) to enhance the results of the adsorption procedure. The NH-Ce-MOF proposal is a practical, affordable solution for eliminating BR46 dye from wastewater streams because the adsorbent was composed of reusable materials and reused over five times with excellent efficiency.
本研究通过用谷氨酸功能化铈金属有机框架（Ce-MOF）以制备NH-Ce-MOF，来研究从水溶液中高效去除阳离子碱性红46（BR46）染料的方法。NH-Ce-MOF通过后合成功能化策略轻松制备，并通过多种方法进行了广泛分析，包括X射线衍射（XRD）、扫描电子显微镜（SEM）、X射线光电子能谱（XPS）、能量色散X射线（EDX）和N吸附/脱附等温线。研究结果表明，合成的吸附剂具有1158.8 m²/g的高比表面积、1.511 nm 的孔径和0.875 cm³/g的孔体积。吸附BR46染料后，比表面积降至872.6 m²/g，孔径减小至1.18 nm，孔体积释放至0.53 cm³/g。比表面积、孔径和体积的减小表明该材料具有很强的吸附物质能力，因为染料分子可以填充微小的孔隙。它们表现出454.8 mg/g的增强吸附能力。Langmuir等温线和准二级动力学模型分别在模拟吸附等温线和动力学曲线方面表现最佳。包括氢键、静电相互作用、π-π共轭、孔填充和范德华力在内的各种吸附驱动力支持了28.4 kJ/mol的化学吸附和吸附能表现。在对温度的影响进行深入研究后确定，吸附过程是吸热的，由83.7 kJ/mol·K的正Δ°表明，并且是自发的，随着温度升高Δ°负值的增加证实了这一点。此外，随着温度升高随机性的增加在289.32 J/mol的Δ°值中很明显。采用Box-Behnken设计（BBD）和响应面方法（RSM）来增强吸附过程的结果。NH-Ce-MOF方案是一种实用、经济的解决方案，用于从废水流中去除BR46染料，因为吸附剂由可重复使用的材料组成，并且可以高效重复使用超过五次。
