Key Laboratory of Vector Biology and Pathogen Control of Zhejiang Province, College of Life Science, Huzhou University, Huzhou 313000, PR China.
Division of Chemical Pharmaceuticals, Shanghai Institute of Pharmaceutical Industry, Shanghai 201203, PR China.
Int J Biol Macromol. 2023 Aug 30;247:125503. doi: 10.1016/j.ijbiomac.2023.125503. Epub 2023 Jun 20.
Epichlorohydrin-modified chitosan-Schiff base composite (CS/24Cl/ECH) prepared via the one-pot reaction as characterized by Fourier transform Infra-Red spectroscopy (FT-IR), X-ray powder diffraction (XRD), Differential scanning calorimetry (DSC) and Scanning electron microscope (SEM). Its removal ability of Pb(II) ions from aqueous solution was investigated. The adsorption of Pb(II) ions carried out at different initial pH, dose of CS/24-Cl/ECH, contact time and co-existing ions. The maximum adsorption capacity of Pb(II) ions was 170 mg/g. Finally, based on the absorption results, the adsorption of Pb(II) ions was fitted by single-layer Langmuir isotherm model and the pseudo-second-order (PSO) kinetics model. The absorption mechanism of Pb(II) ions was controlled by chemical coordination Pb(II) ions with the active sites on the surface of CS/24Cl/ECH composite. Also, CS/24Cl/ECH showed excellent recyclable efficiency up to 5 cycle and potential sorbent for other heavy metal ions.
通过一锅反应制备的表氯醇改性壳聚糖席夫碱复合材料（CS/24Cl/ECH），通过傅里叶变换红外光谱（FT-IR）、X 射线粉末衍射（XRD）、差示扫描量热法（DSC）和扫描电子显微镜（SEM）进行了表征。研究了其从水溶液中去除 Pb(II)离子的能力。在不同的初始 pH 值、CS/24-Cl/ECH 用量、接触时间和共存离子条件下进行了 Pb(II)离子的吸附实验。Pb(II)离子的最大吸附容量为 170mg/g。最后，基于吸附结果，采用单层 Langmuir 等温吸附模型和拟二级（PSO）动力学模型对 Pb(II)离子的吸附进行拟合。Pb(II)离子的吸附机制是通过化学配位，Pb(II)离子与 CS/24Cl/ECH 复合材料表面的活性位点发生配位。此外，CS/24Cl/ECH 在 5 次循环中表现出优异的可回收效率，是一种有潜力的用于其他重金属离子的吸附剂。
