Mone Mariza, Lambropoulou Dimitra A, Bikiaris Dimitrios N, Kyzas George
Laboratory of Polymer Chemistry and Technology, Department of Chemistry, Aristotle University of Thessaloniki, GR-541 24 Thessaloniki, Greece.
Laboratory of Environmental Pollution Control, Department of Chemistry, Aristotle University of Thessaloniki, GR-541 24 Thessaloniki, Greece.
Polymers (Basel). 2020 May 20;12(5):1173. doi: 10.3390/polym12051173.
This work investigates the application of 5-hydroxymethyl-furfural (HMF) as a grafting agent to chitosan (CS). The material produced was further modified by cross-linking. Three different derivatives were tested with molecular ratios CS/HMF of 1:1 (CS-HMF1), 2:1 (CS-HMF2) and 10:1 mol/mol (CS-HMF3)) to remove Cu and Cd from aqueous solutions. CS-HMF derivatives were characterized both before, and after, metal ions adsorption by using scanning electron microscopy (SEM), as well as Fourier-transform infrared (FTIR) spectroscopy thermogravimetric analysis (TGA), and X-Ray diffraction analysis (XRD). The CS-HMF derivatives were tested at pH = 5 and showed higher adsorption capacity with the increase of temperature. Also, the equilibrium data were fitted to Langmuir (best fitting) and Freundlich model, while the kinetic data to pseudo-first (best fitting) and pseudo-second order equations. The Langmuir model fitted better (higher R) the equilibrium data than the Freundlich equation. By increasing the HMF grafting from 130% (CS-HMF1) to 310% (CS-HMF3), an increase of 24% (26 m/g) was observed for Cu adsorption and 19% (20 mg/g) for Cd. By increasing from = 25 to 65 °C, an increase of the adsorption capacity (metal uptake) was observed. Ten reuse cycles were successfully carried out without significant loss of adsorption ability. The reuse potential was higher of Cd, but more stable desorption reuse ability during all cycles for Cu.
本研究探讨了5-羟甲基糠醛（HMF）作为接枝剂在壳聚糖（CS）上的应用。通过交联对所得材料进行进一步改性。测试了三种不同的衍生物，壳聚糖与HMF的分子比分别为1:1（CS-HMF1）、2:1（CS-HMF2）和10:1 mol/mol（CS-HMF3），用于从水溶液中去除铜和镉。通过扫描电子显微镜（SEM）、傅里叶变换红外光谱（FTIR）、热重分析（TGA）和X射线衍射分析（XRD）对金属离子吸附前后的CS-HMF衍生物进行了表征。CS-HMF衍生物在pH = 5条件下进行测试，结果表明随着温度升高吸附容量增加。此外，平衡数据符合朗缪尔模型（拟合效果最佳）和弗伦德里希模型，动力学数据符合准一级（拟合效果最佳）和准二级方程。朗缪尔模型对平衡数据的拟合效果优于弗伦德里希方程。将HMF接枝率从130%（CS-HMF1）提高到310%（CS-HMF3）时，观察到铜的吸附量增加了24%（26 m/g），镉的吸附量增加了19%（20 mg/g）。温度从25℃升高到65℃时，吸附容量（金属吸收量）增加。成功进行了十次重复使用循环，吸附能力无显著损失。镉的重复使用潜力更高，但在所有循环中铜的解吸重复使用能力更稳定。
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