Mottola Stefania, Viscusi Gianluca, Tohamy Hebat-Allah S, El-Sakhawy Mohamed, Gorrasi Giuliana, De Marco Iolanda
Department of Industrial Engineering, University of Salerno, Via Giovanni Paolo II, 132, 84084 Fisciano, Salerno, Italy; Research Centre for Biomaterials BIONAM, University of Salerno, Via Giovanni Paolo II, 132, 84084 Fisciano, Salerno, Italy.
Cellulose & Paper Department, National Research Centre, 33 El-Bohouth St., Dokki, Giza P.O. 12622, Egypt.
J Environ Manage. 2024 Nov;370:122714. doi: 10.1016/j.jenvman.2024.122714. Epub 2024 Oct 8.
This work aims to apply carbon quantum dots (CQDs) from agriculture cellulosic waste (agro wastes), produced via an economically and eco-friendly single-step method, to be used into cellulose acetate composite microfibrous membranes as an innovative solution specifically designed to adsorb methylene blue (MB) and other cationic dyes that are present in various water effluents. Batch adsorption tests were conducted, with variations in contact time (1-24 h), initial MB concentration (25-300 ppm), and adsorbent doses (1-20 g/L). The maximum adsorption capacity of the membrane was 198 mg/g with an initial concentration of 300 ppm at 298 K. Thermodynamic parameters showed that the process is endothermic. Equilibrium experimental data for MB adsorption onto electrospun adsorbent were fitted using different isothermal models, with the Freundlich model showing the best fit. The pseudo-second-order model accurately described the kinetic data with high reliability (R > 0.99), and the calculated adsorption capacity was very close to the experimental data. N-CQDs loaded membranes were also tested for removing methyl violet and rhodamine B, demonstrating remarkably high dye removal efficiency. The underlying adsorption mechanism was also reported. Finally, it is worth mentioning that composite adsorbents can be efficiently applied to actual industrial cases because of the possibility of reusing them, opening the route to the fabrication of novel and highly performant adsorbents. These findings underscore N-CQDs' effectiveness in enhancing pollutant removal efficiency from wastewater, highlighting their environmental benefits and promoting a more sustainable approach to water treatment. Therefore, the prepared adsorbent, showing excellent adsorption performance, places them among adsorbents for practical applications in wastewater purification.
这项工作旨在将通过经济环保的单步方法从农业纤维素废料（农业废弃物）中制备的碳量子点（CQDs）应用于醋酸纤维素复合微纤维膜，作为一种专门设计用于吸附各种废水里存在的亚甲基蓝（MB）和其他阳离子染料的创新解决方案。进行了批量吸附试验，改变接触时间（1 - 24小时）、初始MB浓度（25 - 300 ppm）和吸附剂剂量（1 - 20 g/L）。在298 K下，初始浓度为300 ppm时，该膜的最大吸附容量为198 mg/g。热力学参数表明该过程是吸热的。使用不同的等温模型对MB吸附到电纺吸附剂上的平衡实验数据进行拟合，Freundlich模型显示拟合效果最佳。准二级模型以高可靠性（R > 0.99）准确描述了动力学数据，计算得到的吸附容量与实验数据非常接近。负载N - CQDs的膜也用于去除甲基紫和罗丹明B的测试，显示出非常高的染料去除效率。还报道了潜在的吸附机制。最后，值得一提的是，由于复合吸附剂具有可重复使用的可能性，因此可以有效地应用于实际工业案例，为制造新型高性能吸附剂开辟了道路。这些发现强调了N - CQDs在提高废水污染物去除效率方面的有效性，突出了它们的环境效益，并促进了更可持续的水处理方法。因此，所制备的吸附剂具有优异的吸附性能，使其跻身于可实际应用于废水净化的吸附剂之列。
