摘要
研究了用天然高分子产物壳聚糖作为固体萃取剂吸附Cr(Ⅵ)的动力学行为,考察了溶液的pH值、Cr(Ⅵ)起始浓度对吸附行为的影响。动力学研究表明:溶液的pH值能够显著影响壳聚糖对Cr(Ⅵ)的去除效率,实验最佳pH值为4.0,分别运用Lagergren一级、HoYS二级、Elovich方程和粒子内部扩散吸附动力学模型对吸附动力学进行了分析探讨和比较研究,实验数据符合HoYS二级吸附动力学模型,相关系数为0.9942。
The batch removal of chromium （Ⅵ） from aqueous solution by chitosan under different experimental conditions such as the pH values, initial chromium （Ⅵ） ion concentration was investigated. Adsorption of chromium （Ⅵ） is highly pH-dependent and the results indicated that the optimum pH for the removal was found to be 4. 0. A comparison of the kinetic models applied to the adsorption of chromium（Ⅵ） by chitosan was evaluated for the Lagergren first-order, Ho Y S second-order, Elovich equation and intraparticle diffusion kinetic models, respectively. Results show that the Ho Y S secondorder kinetic model was found to correlate the experimental data well （r^2=0. 9942）.
出处
《皮革与化工》
CAS
2008年第4期5-8,共4页
Leather And Chemicals
