College of Chemistry and Chemical Engineering, South China University of Technology, Guangzhou 510640, China.
College of Chemistry and Chemical Engineering, South China University of Technology, Guangzhou 510640, China.
J Hazard Mater. 2016 May 5;308:225-32. doi: 10.1016/j.jhazmat.2016.01.042. Epub 2016 Jan 19.
Poly(acrylic acid) grafted and glutaraldehyde-crosslinked chitosan nano adsorbent (PAACS) was synthesized by using Pb(2+) as a template ion. The structure and morphology of PAACS were characterized by FT-IR, XRD, SEM and elemental analyses. The adsorption of PAACS for different heavy metal ions was compared and the effects of various variables for adsorption of Pb(2+) were systematically studied. The results indicated that the PAACS was the aggregates of nanoparticles with the diameter of about 50-200 nm and had selectivity for Pb(2+) adsorption. The adsorption for Pb(2+) showed a maximum adsorption capacity of 734.3 mg g(-1) at pH 5.0 and 303 K, which was higher than in a study previously reported on ion-imprinted adsorbents. The adsorption followed the pseudo-second-order kinetics and Langmuir isotherm models. The adsorption was spontaneous and changed from chemical process into physical process when the temperature exceeded 303 K. The adsorbent could be recycled with EDTA. Therefore, PAACS would be useful as a selective and high uptake nano adsorbent in the removal of Pb(2+) from effluents.
聚（丙烯酸）接枝和戊二醛交联壳聚糖纳米吸附剂（PAACS）是通过使用 Pb(2+) 作为模板离子合成的。通过 FT-IR、XRD、SEM 和元素分析对 PAACS 的结构和形态进行了表征。比较了 PAACS 对不同重金属离子的吸附作用，并系统研究了各种变量对 Pb(2+) 吸附的影响。结果表明，PAACS 是直径约为 50-200nm 的纳米颗粒的聚集体，对 Pb(2+) 吸附具有选择性。在 pH 值为 5.0 和 303K 时，对 Pb(2+) 的最大吸附容量为 734.3mg g(-1)，高于先前报道的离子印迹吸附剂。吸附遵循准二级动力学和 Langmuir 等温线模型。当温度超过 303K 时，吸附是自发的，并且从化学过程变为物理过程。该吸附剂可以用 EDTA 回收。因此，PAACS 将是一种有用的选择性和高吸附量纳米吸附剂，可用于从废水中去除 Pb(2+)。
