壳聚糖-锆（IV）复合材料的制备及对钒（V）的吸附性能研究。
Preparation and characterization of chitosan-zirconium(IV) composite for adsorption of vanadium(V).
机构信息
Research Center of Analysis and Test, 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.
School of Chemistry and Molecular Engineering, East China University of Science and Technology, Shanghai 200237, PR China.
出版信息
Int J Biol Macromol. 2014 Mar;64:155-61. doi: 10.1016/j.ijbiomac.2013.11.040. Epub 2013 Dec 8.
In this present study, an inorganic-biopolymer composite based on chitosan-zirconium(IV) was prepared and investigated as a biosorbent for the removal of vanadium(V) ions from aqueous solution. The resulting composite before and after adsorbed V(V) were characterized by using FT-IR, XRD, SEM and EDS, respectively. Various relevant parameters affecting the adsorption capacity such as pH, initial concentration, contact time, temperature and co-existing ions were evaluated. The results demonstrated that the optimum pH was found to be 4.0 and the equilibrium was achieved after 4h for V(V) adsorption. The Langmuir isotherm model could be well described the adsorption of V(V), with the maximum adsorption capacity of 208 mg g(-1) at 30 °C. The kinetics data were well fitted to pseudo-second-order equation, indicating that chemical sorption as the rate-limiting step of adsorption mechanism. The calculated thermodynamic parameters such as ΔG°, ΔH° and ΔS° indicated that the adsorption process was feasible, spontaneous and endothermic in nature. Moreover, co-existing ions including nitrate, chloride and sulfate had a certain effect on the uptake of V(V). The V(V) loaded chitosan-zirconium(IV) composite could be regenerated by 0.01 mol L(-1) sodium hydroxide, with efficiency greater than 95%.
在本研究中，制备了一种基于壳聚糖-锆（IV）的无机-生物聚合物复合材料，并将其作为一种生物吸附剂，用于从水溶液中去除钒（V）离子。用 FT-IR、XRD、SEM 和 EDS 分别对吸附 V(V)前后的复合材料进行了表征。评价了各种相关参数对吸附容量的影响，如 pH 值、初始浓度、接触时间、温度和共存离子。结果表明，最佳 pH 值为 4.0，V(V)吸附的平衡时间为 4 小时。Langmuir 等温线模型可以很好地描述 V(V)的吸附，在 30°C 时最大吸附容量为 208mg g(-1)。动力学数据很好地符合拟二级方程，表明化学吸附是吸附机制的限速步骤。计算得出的热力学参数如ΔG°、ΔH°和ΔS°表明，吸附过程是可行的、自发的和吸热的。此外，共存离子如硝酸盐、氯化物和硫酸盐对 V(V)的摄取有一定的影响。负载 V(V)的壳聚糖-锆（IV）复合材料可以用 0.01mol L(-1)的氢氧化钠再生，效率大于 95%。
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