College of Science, Northwest A&F University, Yangling, Shaanxi 712100, China.
Xi'an Institute of Geology and Mineral Resource, Xi'an, Shaanxi 710054, China.
Int J Biol Macromol. 2015 Jan;72:1129-35. doi: 10.1016/j.ijbiomac.2014.10.008. Epub 2014 Oct 22.
In this study, cross-linked chitosan (CCS)/bentonite (BT) composite was prepared by the intercalation of chitosan in bentonite and the cross-linking reaction between chitosan and glutaraldehyde. CCS/BT composite was characterized by using Fourier transform infrared spectroscopy (FTIR), scanning electron microscopy (SEM), X-ray diffraction (XRD) and thermal gravimetric analyses (TGA). Their adsorption characteristics were assessed by using an azo dye (Amido Black 10B) as a model adsorbate. The adsorption of Amido Black 10B onto the CCS/BT composite was found to be optimal at pH 2. The adsorption isotherm was well described by the Langmuir model and the maximum adsorption capacity was 323.6 mg/g at 293K and pH 2. Amido Black 10B adsorption kinetics followed a pseudo-second-order kinetic model. The calculated thermodynamic parameters showed that the adsorption of Amido Black 10B by CCS/BT composite was spontaneous and endothermic in nature.
在这项研究中，通过壳聚糖在膨润土中的插层和壳聚糖与戊二醛之间的交联反应，制备了交联壳聚糖（CCS）/膨润土（BT）复合材料。采用傅里叶变换红外光谱（FTIR）、扫描电子显微镜（SEM）、X 射线衍射（XRD）和热重分析（TGA）对 CCS/BT 复合材料进行了表征。采用偶氮染料（Amido Black 10B）作为模型吸附质评估了其吸附特性。发现 CCS/BT 复合材料对 Amido Black 10B 的吸附在 pH 2 时最佳。吸附等温线很好地符合朗缪尔模型，在 293K 和 pH 2 时最大吸附容量为 323.6mg/g。Amido Black 10B 的吸附动力学符合准二级动力学模型。计算的热力学参数表明，CCS/BT 复合材料对 Amido Black 10B 的吸附是自发和吸热的。
