El-Fattah Wesam Abd, Guesmi Ahlem, Hamadi Naoufel Ben, Alzahrani Amjad, Alluhaybi Ahmad A, El-Desouky M G
Chemistry Department, College of Science, IMSIU (Imam Mohammad Ibn Saud Islamic University), P.O. Box 5701, Riyadh 11432, Saudi Arabia.
Department of Chemistry, University College in Al-Qunfudhah, Umm Al-Qura University, Saudi Arabia.
Int J Biol Macromol. 2025 Jun;311(Pt 2):143596. doi: 10.1016/j.ijbiomac.2025.143596. Epub 2025 May 1.
The study aimed to evaluate enhancements in both stability and efficiency concerning the removal of Hg(II) ions. This research specifically concentrated on creating an innovative electrospun nanofibrous membrane (CPP) that is made up of chitosan (CS), polyethylenimine (PEI), and polycaprolactone (PCL). The membrane's primary purpose is to enhance the elimination of Hg(II) from aqueous solutions. By carefully adjusting the electrospinning process variables, we improved its efficiency. Characterization techniques like FTIR, XRD, XPS, SEM, and EDX confirm the successful creation of a highly crosslinked CPP nanofiber membrane. This detailed examination reveals the textural attributes of the material, concurrently underlining its relevance in various domains. The investigation additionally delves into the impact of several aspects on the adsorption mechanism, comprising dosage, pH levels, temperature, and initial Hg(II) concentration. The research incorporates an analysis of adsorption characteristics by integrating kinetic evaluations with equilibrium studies. The findings indicate that the adsorption mechanism aligns with the values of pseudo-second-order kinetics and is appropriately represented by the Langmuir isotherm model. Furthermore, the data suggest a hybrid nature of the adsorption procedure, exhibiting both spontaneous and endothermic characteristics, as showed by the increased metal adsorption at elevated temperatures. The analysis reveals that optimal conditions for the elimination of Hg(II) ions in water purification involve a pH of 6 and the use of 0.02 g of CPP per 25 mL of solution, corresponding to a projected adsorption capability of 393.043 mg/g precisely for the Hg(II) ions solution. To enhance the efficacy of the adsorbent in the elimination of Hg(II) ions from water, several key parameters require careful examination. Notable advancements in adsorption performance have been achieved through the application of response surface methodologies and structured experimentation utilizing the Box-Behnken design, facilitated by the Design-Expert software. A thorough evaluation of the reusability of the adsorbent, conducted during five consecutive cycles of adsorption and desorption, shows a remarkable stability in its ability to efficiently remove Hg(II) ions.
该研究旨在评估去除汞离子（Hg(II)）时稳定性和效率的提升。本研究特别专注于制备一种由壳聚糖（CS）、聚乙烯亚胺（PEI）和聚己内酯（PCL）组成的创新型电纺纳米纤维膜（CPP）。该膜的主要目的是增强从水溶液中去除Hg(II)的能力。通过仔细调整电纺工艺变量，我们提高了其效率。傅里叶变换红外光谱（FTIR）、X射线衍射（XRD）、X射线光电子能谱（XPS）、扫描电子显微镜（SEM）和能谱仪（EDX）等表征技术证实成功制备了高度交联的CPP纳米纤维膜。这一详细研究揭示了该材料的结构特性，同时突显了其在各个领域的相关性。该研究还深入探讨了几个方面对吸附机制的影响，包括用量、pH值、温度和初始Hg(II)浓度。该研究通过将动力学评估与平衡研究相结合来分析吸附特性。研究结果表明，吸附机制符合准二级动力学值，并由朗缪尔等温线模型恰当表示。此外，数据表明吸附过程具有混合性质，表现出自发性和吸热特性；高温下金属吸附量增加就显示了这一点。分析表明，水净化过程中去除Hg(II)离子的最佳条件是pH值为6，每25 mL溶液使用0.02 g CPP，对于Hg(II)离子溶液，预计吸附能力精确为393.043 mg/g。为提高吸附剂从水中去除Hg(II)离子的效果，需要仔细研究几个关键参数。通过应用响应面方法和利用Box-Behnken设计的结构化实验（由Design-Expert软件辅助），吸附性能取得了显著进展。在连续五个吸附和解吸循环中对吸附剂的可重复使用性进行的全面评估表明，其有效去除Hg(II)离子的能力具有显著稳定性。
