Qu Rongjun, Sun Changmei, Ma Fang, Zhang Ying, Ji Chunnuan, Xu Qiang, Wang Chunhua, Chen Hou
School of Chemistry and Materials Science, Ludong University, Shandong, China.
J Hazard Mater. 2009 Aug 15;167(1-3):717-27. doi: 10.1016/j.jhazmat.2009.01.043. Epub 2009 Jan 20.
Two types of chitosan-coated cotton fibers (SCCH and RCCH) were applied to remove and recover Hg(II) ions in aqueous solution. The adsorption kinetics and isotherms of the two fibers for Hg(II) were investigated at different temperatures. The results revealed that the adsorption kinetic processes of SCCH and RCCH fibers for Hg(II) followed the pseudo second-order model at lower temperatures and the pseudo first-order model at higher temperatures. Both the Langmuir and Freundlich models well described the adsorption isotherms of SCCH and RCCH fibers for Hg(II) in the temperature range studied. SCCH and RCCH fibers selectively adsorbed Hg(II) from binary ion systems in the presence of Pb(II), Cu(II), Ni(II), Cd(II), Zn(II), Co(II), Mn(II) and Ag(I). Increased temperature was beneficial to adsorption. The recovery of Hg(II) from aqueous solutions was also studied as a function of sample flow rate and volume, concentration and volume of eluent, elution rate, quantity of adsorbents added and concomitant ions. The results showed that the two fibers efficiently enriched and recovered Hg(II) in the presence of alkali and alkaline earth metals and some heavy metals under optimum conditions. The RCCH fiber exhibited better stability than the SCCH fiber following repeated use.
采用两种壳聚糖包覆棉纤维（SCCH和RCCH）去除并回收水溶液中的Hg(II)离子。在不同温度下研究了这两种纤维对Hg(II)的吸附动力学和等温线。结果表明，SCCH和RCCH纤维对Hg(II)的吸附动力学过程在较低温度下遵循准二级模型，在较高温度下遵循准一级模型。在所研究的温度范围内，Langmuir模型和Freundlich模型均能很好地描述SCCH和RCCH纤维对Hg(II)的吸附等温线。在Pb(II)、Cu(II)、Ni(II)、Cd(II)、Zn(II)、Co(II)、Mn(II)和Ag(I)存在的情况下，SCCH和RCCH纤维能从二元离子体系中选择性吸附Hg(II)。温度升高有利于吸附。还研究了从水溶液中回收Hg(II)与样品流速和体积、洗脱剂浓度和体积、洗脱速率、添加吸附剂的量以及共存离子的关系。结果表明，在最佳条件下，这两种纤维在碱金属、碱土金属和一些重金属存在的情况下能有效富集和回收Hg(II)。重复使用后，RCCH纤维比SCCH纤维表现出更好的稳定性。
