Zirconium cross-linked chitosan composite: Preparation, characterization and application in adsorption of Cr(VI)
Zirconium cross-linked chitosan composite: Preparation, characterization and application in adsorption of Cr(VI)
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DOI：
10.1016/j.cej.2013.05.102
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发表时间：
2013-08
影响因子：
15.1
通讯作者：
Lingfan Zhang;W. Xia;Bo Teng;Xin Liu;Wenqing Zhang
中科院分区：
文献类型：
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作者：
Lingfan Zhang;W. Xia;Bo Teng;Xin Liu;Wenqing Zhang
本文报道了一种用于吸附六价铬的锆壳聚糖(Zr-CTS)复合材料。通过氧氯化锆与壳聚糖生物聚合物基质的配位反应，合成了锆基CTS复合材料。用FT-IR、X射线衍射仪、扫描电子显微镜和能谱仪对所制备的复合材料进行了表征。系统地研究了该复合材料对六价铬的吸附性能。研究了可能影响吸附行为的各种因素。结果表明，在30℃，pH为5.0时，该复合材料对铬(VI)的吸附符合朗缪尔等温线模型(R2=0.9993)，最大吸附容量为175g/−。热力学结果表明，铬的吸附是一个自发吸热过程。此外，共存离子包括硝酸盐、氯化物和硫酸盐对铬(VI)在Zr-CTS复合材料上的吸附有影响。用0.05mol的L−-1氢氧化钠再生了吸附了六价铬的锆壳聚糖复合材料，再生效率大于91%。
In the present paper, a zirconium–chitosan (Zr–CTS) composite is reported for adsorption of Cr(VI). The Zr–CTS composite was synthesized through the coordination reaction between zirconium oxychloride and chitosan biopolymeric matrix. Then the prepared composite was characterized by FT-IR, XRD, SEM and EDS. The adsorption properties of the resulting composite toward Cr(VI) were systematically investigated. Various factors possibly affecting the adsorption behavior were also studied. The results demonstrated that the equilibrium adsorption behavior of Cr(VI) on the prepared Zr–CTS composite had a good agreement with the Langmuir isotherm model (R2= 0.9993), and the maximum adsorption capacity was calculated as 175 mg g−1for Cr(VI) with pH 5.0 at 30 °C. The thermodynamic results revealed that chromium adsorption was a spontaneous and endothermic process. Furthermore, co-existing ions including nitrate, chloride and sulfate had effects on the uptake of Cr(VI) on the Zr–CTS composite. The Cr(VI) adsorbed Zr–CTS composite was regenerated with an efficiency of greater than 91% using 0.05 mol L−1sodium hydroxide.