Elamin Nuha Y, Elamin Mohamed R, Alhussain Hanan, Alotaibi Mohammed T, Alluhaybi Ahmad A, El-Bindary Ashraf A
Department of Chemistry, College of Science, Imam Mohammad Ibn Saud Islamic University (IMSIU), P.O. Box 5701, Riyadh 11623, Saudi Arabia.
Department of Chemistry, Turabah University College, Taif University, P.O. Box 11099, Taif 21944, Saudi Arabia.
Int J Biol Macromol. 2025 May;308(Pt 4):142680. doi: 10.1016/j.ijbiomac.2025.142680. Epub 2025 Mar 30.
The research focused on assessing the improvements in stability and effectiveness regarding the elimination of Cd(II) ions. Specifically, this study involved the development of a novel electrospun nanofibrous membrane composed of chitosan (CS), carbon quantum dots (CQDs), and polycaprolactone (PCL). The membrane's primary application is the elimination of Cd(II) ions, from aqueous solutions. By precisely fine-tuning the electrospinning process parameters, we succeeded in optimizing the membrane. The characterizations performed using FTIR, XRD, XPS, SEM and EDX confirm the successful formation of a robustly crosslinked CS/CQDs/PCL nanofiber membrane. This thorough investigation not only showcases the material's textural characteristics but also underscores its potential for various applications. The examination further analyzed the influence of numerous factors, such as dosage, pH, temperature, and initial concentration, by the adsorption mechanism. The research incorporated equilibrium assessments in conjunction with kinetic evaluations to evaluate the characteristics of adsorption. The results showed that the Langmuir isotherm model well captured the adsorption process and that it complied with pseudo-second-order kinetics values. The fact that metal adsorption rises with temperature indicates that endothermic reactions and spontaneous behavior are both features of the adsorption process. The data suggests that the most effective situations for the elimination of Cd(II) ions in water purification are characterized by a pH level of 6, a amount of 0.02 g of CS/CQDs/PCL per 25 mL, and an adsorption capability measured at 340.05 mg/g precisely for the Cd(II) ions solution. In order to enhance the efficiency of the adsorbent in Cd(II) ions elimination from water, it is crucial to consider multiple significant factors. Systematic trials using the Box-Behnken design and response surface methods, made possible by the Design-Expert software, demonstrated significant improvements in the adsorption efficiency. A thorough assessment of the adsorbent's reusability conducted over five consecutive adsorption and desorption cycles shows a high degree of consistency in its removal efficacy.
该研究聚焦于评估在去除镉（II）离子方面稳定性和有效性的提升。具体而言，本研究涉及开发一种由壳聚糖（CS）、碳量子点（CQDs）和聚己内酯（PCL）组成的新型电纺纳米纤维膜。该膜的主要应用是从水溶液中去除镉（II）离子。通过精确微调电纺工艺参数，我们成功优化了该膜。使用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）进行的表征证实了坚固交联的CS/CQDs/PCL纳米纤维膜的成功形成。这项深入研究不仅展示了该材料的结构特征，还强调了其在各种应用中的潜力。该研究进一步通过吸附机制分析了诸多因素的影响，如剂量、pH值、温度和初始浓度。该研究结合平衡评估与动力学评估来评价吸附特性。结果表明，朗缪尔等温线模型很好地描述了吸附过程，且符合伪二级动力学值。金属吸附随温度升高这一事实表明，吸热反应和自发行为都是吸附过程的特征。数据表明，在水净化中去除镉（II）离子的最有效情况是pH值为6、每25 mL含有0.02 g CS/CQDs/PCL，且对于镉（II）离子溶液的吸附能力精确为340.05 mg/g。为提高吸附剂从水中去除镉（II）离子的效率，考虑多个重要因素至关重要。借助Design-Expert软件通过Box-Behnken设计和响应面方法进行的系统试验表明吸附效率有显著提高。对吸附剂在连续五个吸附和解吸循环中的可重复使用性进行的全面评估显示其去除效果具有高度一致性。
