School of Chemistry and Molecular Engineering, East China University of Science and Technology, Shanghai 200237, PR China.
School of Chemistry and Molecular Engineering, East China University of Science and Technology, Shanghai 200237, PR China; Research Center of Analysis and Test, East China University of Science and Technology, Shanghai 200237, PR China.
Int J Biol Macromol. 2015 Aug;79:110-7. doi: 10.1016/j.ijbiomac.2015.04.065. Epub 2015 May 2.
In this present study, a new chitosan bead modified with titanium ions (TiCB) was prepared and employed for the adsorption of vanadium ions from aqueous solutions. Batch adsorption experiments were performed to research the effect of various factors, including pH, temperature, contact time and initial concentration of vanadium(V) ions. The adsorption of vanadium was followed by the pseudo second-order kinetic and the Langmuir isotherm model, with a remarkable maximum adsorption capacity of 210 mg/g. The analysis of thermodynamic parameters (ΔG°, ΔH° and ΔS°) revealed that the nature of adsorption was feasible, spontaneous (ΔG°<0) and endothermic (ΔH°>0) process. FTIR, EDS, EMI and XPS studies suggested that the mechanisms of adsorption were possibly attributed to electrostatic attraction, ligand-exchange and redox reaction between TiCB and vanadium ions.
在本研究中，制备了一种新型的钛离子修饰壳聚糖珠（TiCB），并将其用于从水溶液中吸附钒离子。进行了批量吸附实验，研究了各种因素对吸附的影响，包括 pH 值、温度、接触时间和钒(V)离子的初始浓度。钒的吸附符合准二级动力学和朗缪尔等温吸附模型，最大吸附容量为 210 mg/g。热力学参数（ΔG°、ΔH°和ΔS°）的分析表明，吸附过程是可行的、自发的（ΔG°<0）和吸热的（ΔH°>0）。FTIR、EDS、EMI 和 XPS 研究表明，吸附机制可能归因于 TiCB 与钒离子之间的静电吸引、配体交换和氧化还原反应。
