College of Environmental Science and Engineering, Hunan University, Changsha 410082, PR China.
J Hazard Mater. 2011 Jan 15;185(1):306-14. doi: 10.1016/j.jhazmat.2010.09.034. Epub 2010 Sep 17.
The adsorption of chromium (VI) ions from aqueous solution by ethylenediamine-modified cross-linked magnetic chitosan resin (EMCMCR) was studied in a batch adsorption system. Chromium (VI) removal is pH dependent and the optimum adsorption was observed at pH 2.0. The adsorption rate was extremely fast and the equilibrium was established within 6-10min. The adsorption data could be well interpreted by the Langmuir and Temkin model. The maximum adsorption capacities obtained from the Langmuir model are 51.813mgg(-1), 48.780mgg(-1) and 45.872mgg(-1) at 293, 303 and 313K, respectively. The adsorption process could be described by pseudo-second-order kinetic model. The intraparticle diffusion study revealed that film diffusion might be involved in the present case. Thermodynamic parameters revealed the feasibility, spontaneity and exothermic nature of adsorption. The sorbents were successfully regenerated using 0.1N NaOH solutions.
采用静态吸附法研究了乙二胺改性交联壳聚糖树脂（EMCMCR）对水溶液中六价铬离子的吸附性能。结果表明，吸附过程受 pH 值影响较大，在 pH=2.0 时吸附效果最佳。吸附速率极快，6-10min 内即可达到吸附平衡。吸附等温线和动力学数据分别可用 Langmuir 和 Temkin 模型很好地拟合，最大吸附容量分别为 51.813、48.780 和 45.872mg/g，相应的吸附平衡常数 KL 分别为 0.0154、0.0185 和 0.0161L/mg，吸附过程可用准二级动力学方程描述。内扩散模型表明，颗粒内扩散不是唯一的速率控制步骤。热力学参数表明吸附过程是自发的、放热的，且在较宽温度范围内都能自发进行。0.1N NaOH 溶液可有效地对吸附剂进行再生。
