Vinca Institute of Nuclear Sciences, University of Belgrade, PO Box 522, RS - 11001 Belgrade, Serbia.
J Hazard Mater. 2012 Mar 30;209-210:256-63. doi: 10.1016/j.jhazmat.2012.01.020. Epub 2012 Jan 20.
The synthesis, characterization and environmental application of chitosan/montmorillonite membrane for adsorption Bezactiv Orange V-3R were investigated. Chitosan/montmorillonite membranes were synthesized in different ratios, containing 10-50% of montmorillonite (MMT) in membrane. These membranes were characterized by using Fourier transform infrared spectroscopy (FTIR), thermogravimetry (TG) and scanning electron microscopy (SEM). The adsorption kinetics were investigated using three different concentrations of Bezactiv Orange dye (30, 50 and 80 mg/L). The adsorption capacity increases with increasing amount of MMT in membranes. These membranes show the highest adsorption capacity when the initial dye concentration was 80 mg/L. The results show that the optimum condition for adsorption of Bezactiv Orange is pH 6. A comparison of kinetic models was evaluated for the pseudo-first and pseudo-second order and intra-particle diffusion. The experimental data were fitted to the pseudo-second order kinetic model, and also followed by intra-particle diffusion. Intra-particle diffusion is not the only rate-controlling step. The Langmuir and Freundlich adsorption isotherms were applied to experimental equilibrium data at different concentration of dye solution. The results indicated the competency of chitosan/MMT membranes adsorbent for Bezactiv Orange adsorption.
研究了壳聚糖/蒙脱土膜对 Bezactiv Orange V-3R 的吸附合成、表征及环境应用。以不同比例合成了壳聚糖/蒙脱土膜，膜中含有 10-50%的蒙脱土（MMT）。采用傅里叶变换红外光谱（FTIR）、热重分析（TG）和扫描电子显微镜（SEM）对这些膜进行了表征。使用三种不同浓度的 Bezactiv Orange 染料（30、50 和 80mg/L）研究了吸附动力学。吸附容量随膜中 MMT 含量的增加而增加。当初始染料浓度为 80mg/L 时，这些膜表现出最高的吸附容量。结果表明，吸附 Bezactiv Orange 的最佳条件是 pH 6。对拟一级和拟二级动力学模型以及内扩散进行了动力学模型比较。实验数据拟合到拟二级动力学模型，也符合内扩散。内扩散不是唯一的速率控制步骤。Langmuir 和 Freundlich 吸附等温线适用于不同染料溶液浓度下的实验平衡数据。结果表明壳聚糖/MMT 膜吸附剂对 Bezactiv Orange 的吸附能力较强。
