Guesmi Ahlem, Hamadi Naoufel Ben, El-Fattah Wesam Abd, Subaihi Abdu, Alluhaybi Ahmad A, El-Desouky Mohamed G, El-Bindary Ashraf A
Chemistry Department, College of Science, Imam Mohammad Ibn Saud Islamic University (IMSIU), P.O. Box 5701, Riyadh 11432, Saudi Arabia.
Chemistry Department, College of Science, Imam Mohammad Ibn Saud Islamic University (IMSIU), P.O. Box 5701, Riyadh 11432, Saudi Arabia.
Int J Biol Macromol. 2025 Jul;318(Pt 3):145201. doi: 10.1016/j.ijbiomac.2025.145201. Epub 2025 Jun 11.
This research focused on developing a new bio-based composite adsorbent for efficiently eliminating Pb(II) ions from water. The composite material, referred to as VMCP, was created by incorporating a vanadium-based metal-organic framework (V-MOF) into a matrix made of carboxymethyl cellulose (CMC) and polyethylenimine (PEI), which was then crosslinked using epichlorohydrin. Various analysis techniques including XRD, XPS, SEM-EDX, FT-IR. The nitrogen adsorption-desorption isotherm was employed to verify the creation of a mesoporous structure with a specific surface area of 368.4 m/g, a pore volume of 0.364 cm/g, and an average pore radius of 1.7 nm. Batch adsorption tests examined the influences of pH, initial metal ion concentration, adsorbent dosage, and temperature. The VMCP material demonstrated a maximum adsorption capacity for Pb(II) ions of 360.6 mg/g. Thermodynamic evaluations indicated that the adsorption was spontaneous and endothermic, characterized by positive changes in enthalpy (ΔH° > 0) and entropy (ΔS° > 0). The equilibrium adsorption data were most accurately signified by the Langmuir isotherm model, while the kinetic data conformed to a pseudo-second-order model, signifying that chemisorption was the limiting factor in the rate. Detailed mechanistic studies indicated that the functional groups and mesoporous characteristics were essential for binding metal ions. Additionally, the VMCP adsorbent exhibited significant reusability across five cycles of adsorption and desorption with minimal performance decline. Optimization of the procedure using a Box-Behnken design affirmed the material's stability and suitability for treating wastewater containing heavy metals.
本研究聚焦于开发一种新型生物基复合吸附剂，用于高效去除水中的Pb(II)离子。这种复合材料称为VMCP，它是通过将钒基金属有机框架（V-MOF）掺入由羧甲基纤维素（CMC）和聚乙烯亚胺（PEI）制成的基质中制备而成，然后用环氧氯丙烷进行交联。采用了包括XRD、XPS、SEM-EDX、FT-IR在内的各种分析技术。利用氮吸附-脱附等温线验证了介孔结构的形成，其比表面积为368.4 m²/g，孔体积为0.364 cm³/g，平均孔径为1.7 nm。批量吸附试验考察了pH值、初始金属离子浓度、吸附剂用量和温度的影响。VMCP材料对Pb(II)离子的最大吸附容量为360.6 mg/g。热力学评估表明，吸附是自发的且吸热的，其特征是焓（ΔH°>0）和熵（ΔS°>0）发生正向变化。平衡吸附数据最准确地由朗缪尔等温线模型表示，而动力学数据符合准二级模型，这表明化学吸附是速率的限制因素。详细的机理研究表明，官能团和介孔特性对于结合金属离子至关重要。此外，VMCP吸附剂在五个吸附-解吸循环中表现出显著的可重复使用性，性能下降最小。使用Box-Behnken设计对该工艺进行优化，证实了该材料的稳定性以及处理含重金属废水的适用性。
