Meretoudi Anastasia D, Tolkou Athanasia K, Kosheleva Ramonna I, Xanthopoulou Maria, Tzollas Nikolaos M, Kostoglou Margaritis, Katsoyiannis Ioannis A, Kyzas George Z
Hephaestus Laboratory, School of Chemistry, Faculty of Sciences, Democritus University of Thrace, GR-65404 Kavala, Greece.
Laboratory of Chemical and Environmental Technology, Department of Chemistry, Aristotle University of Thessaloniki, GR-54124 Thessaloniki, Greece.
Langmuir. 2025 Jul 1;41(25):16529-16547. doi: 10.1021/acs.langmuir.5c01927. Epub 2025 Jun 23.
This research aims to develop low-toxicity, cost-effective, and reusable biobased materials by combining natural biopolymers with graphene oxide. Therefore, chitosan/kappa carrageenan (CS/kCar) and chitosan/kappa carrageenan/graphene oxide (CS/kCar@GO) nanocomposites were synthesized and applied for the effective removal of As(III), Cr(VI), and F from aqueous solutions. The results showed that the maximum removal for As(III) (79%), Cr(VI) (99%), and F (36%) was achieved at pH 5.0, 7.0, and 3.0, respectively. The data were best fitted by pseudo-second-order (PSO) kinetics and the Langmuir isotherm model, indicating adsorption capacities of 2.44 for As(III), 2.82 for Cr(VI), and 32.63 mg/g for F from the optimal CS/kCar@GO composite. According to the thermodynamic analysis, the adsorption of heavy metals and fluoride ions on the CS/kCar@GO nanocomposite was endothermic and spontaneous in all cases. Reuse of CS/kCar@GO for up to 10 cycles after regeneration demonstrated the effectiveness of this adsorbent.
本研究旨在通过将天然生物聚合物与氧化石墨烯相结合，开发出低毒、经济高效且可重复使用的生物基材料。因此，合成了壳聚糖/κ-卡拉胶（CS/kCar）和壳聚糖/κ-卡拉胶/氧化石墨烯（CS/kCar@GO）纳米复合材料，并将其用于从水溶液中有效去除As(III)、Cr(VI)和F。结果表明，在pH值分别为5.0、7.0和3.0时，对As(III)（79%）、Cr(VI)（99%）和F（36%）的去除率最高。数据最符合准二级（PSO）动力学和朗缪尔等温线模型，表明从最佳的CS/kCar@GO复合材料中对As(III)的吸附容量为2.44、对Cr(VI)为2.82、对F为32.63 mg/g。根据热力学分析，在所有情况下，重金属和氟离子在CS/kCar@GO纳米复合材料上的吸附都是吸热且自发的。CS/kCar@GO再生后重复使用多达10个循环证明了这种吸附剂的有效性。
