Liakos Efstathios V, Mone Mariza, Lambropoulou Dimitra A, Bikiaris Dimitrios N, Kyzas George Z
Department of Chemistry, International Hellenic University, 65404 Kavala, Greece.
Laboratory of Polymer Chemistry and Technology, Department of Chemistry, Aristotle University of Thessaloniki, 54124 Thessaloniki, Greece.
Polymers (Basel). 2021 Jan 11;13(2):232. doi: 10.3390/polym13020232.
In this experimental study, the use of 5-hydroxymethyl-furfural (HMF) organic compound as a grafting agent to chitosan natural polymer (CS) was examined. One optimized chitosan derivative was synthesized, and then tested (CS-HMF), in order to uptake nickel, mercury, and barium metal ions from single- and triple-component (multi-component) aqueous solutions. The characterization of the material before and after the metal uptake was achieved by scanning electron microscopy (SEM). The ability of the adsorption of CS-HMF was tested at pH = 6. The adjusting of temperature from 25 to 65 °C caused the increase in the adsorption capacity. The equilibrium data were fitted to the models of Langmuir and Freundlich, while the data from kinetic experiments were fitted to pseudo-1st and pseudo-2nd order models. The best fitting was achieved for the Langmuir model (higher R). The adsorption capacity for nickel, mercury, and barium removal at 25 °C (single component) was 147, 107, and 64 (mg/g), respectively. However, the total adsorption capacity for the multi-component was 204 mg/g. A thermodynamic study was also done, and the values of ΔG, ΔH, and ΔS were evaluated.
在本实验研究中，考察了使用5-羟甲基糠醛（HMF）有机化合物作为壳聚糖天然聚合物（CS）的接枝剂。合成了一种优化的壳聚糖衍生物，然后对其（CS-HMF）进行测试，以从单组分和三组分（多组分）水溶液中吸收镍、汞和钡金属离子。通过扫描电子显微镜（SEM）对金属吸收前后的材料进行表征。在pH = 6时测试了CS-HMF的吸附能力。将温度从25℃调节到65℃导致吸附容量增加。将平衡数据拟合到朗缪尔和弗伦德利希模型，而动力学实验数据拟合到拟一级和拟二级模型。朗缪尔模型实现了最佳拟合（R值更高）。在25℃（单组分）下，去除镍、汞和钡的吸附容量分别为147、107和64（mg/g）。然而，多组分的总吸附容量为204 mg/g。还进行了热力学研究，并评估了ΔG、ΔH和ΔS的值。
