Wang Xiaohuan, Zheng Yian, Wang Aiqin
Center of Eco-material and Green Chemistry, Lanzhou Institute of Chemical Physics, Chinese Academy of Sciences, Tianshui Middle Road 18, Lanzhou 730000, PR China.
J Hazard Mater. 2009 Sep 15;168(2-3):970-7. doi: 10.1016/j.jhazmat.2009.02.120. Epub 2009 Mar 6.
Novel chitosan-g-poly(acrylic acid)/attapulgite (CTS-g-PAA/APT) composites were applied as adsorbents for the removal of Cu(II) from aqueous solution. The effects of the initial pH value (pH(0)) of Cu(II) solution, contact time (t), APT content (wt%) and the initial concentration of Cu(II) solution (C(0)) on the adsorption capacity of the composites were investigated. Results from kinetic experimental data showed that the Cu(II) adsorption rate on the composites with 10, 20 and 30 wt% APT was fast and more than 90% of the maximum adsorption capacity for Cu(II) occurred within the initial 15 min. The adsorption kinetics was better described by the pseudo-second order equation, and their adsorption isotherms were better fitted for the Langmuir equation. The results of the five-time consecutive adsorption-desorption studies showed that the composites had high adsorption and desorption efficiencies, which implies that the composites may be used as quite effective adsorbents for the removal of Cu(II) from aqueous solution.
新型壳聚糖接枝聚（丙烯酸）/凹凸棒石（CTS-g-PAA/APT）复合材料被用作吸附剂，用于从水溶液中去除Cu(II)。研究了Cu(II)溶液的初始pH值（pH(0)）、接触时间（t）、APT含量（wt%）以及Cu(II)溶液的初始浓度（C(0)）对复合材料吸附容量的影响。动力学实验数据结果表明，含有10%、20%和30%（重量）APT的复合材料对Cu(II)的吸附速率很快，在最初的15分钟内，Cu(II)的最大吸附容量的90%以上就已实现。吸附动力学用伪二级方程能更好地描述，其吸附等温线更符合朗缪尔方程。连续五次吸附-解吸研究结果表明，该复合材料具有较高的吸附和解吸效率，这意味着该复合材料可作为从水溶液中去除Cu(II)的非常有效的吸附剂。
