Department of Environmental Engineering, Taizhou University, Linhai 317000, PR China.
J Hazard Mater. 2010 Jul 15;179(1-3):251-7. doi: 10.1016/j.jhazmat.2010.02.087. Epub 2010 Mar 3.
A novel magnetically separable adsorbent, namely magnetic gamma-Fe(2)O(3)/crosslinked chitosan composites (Mgamma-Fe(2)O(3)/CSCs), was prepared by microemulsion process and characterized by XRD, FT-IR, TGA, DSC, SEM and VSM. Adsorption of methyl orange (MO), used as a model pollutant, from aqueous solution on Mgamma-Fe(2)O(3)/CSCs was investigated. Characterization results indicated that magnetic gamma-Fe(2)O(3) nanoparticles have been introduced in Mgamma-Fe(2)O(3)/CSCs and kept intrinsic magnetic properties. The saturated magnetization (sigma(s)) of Mgamma-Fe(2)O(3)/CSCs can be expediently adjusted by changing additive dosage of gamma-Fe(2)O(3). Adsorption results showed that both nanocomposite adsorbents with weight ratio of gamma-Fe(2)O(3) to chitosan of 1:10 and 2:5 exhibited higher adsorption capacities and attained adsorption equilibria in shorter time compared with crosslinked chitosan. After adsorption, Mgamma-Fe(2)O(3)/CSCs were effectively separated from reaction solution in 10s by applying an adscititious magnetic field. Adsorption kinetics of MO on 1:10 Mgamma-Fe(2)O(3)/CSCs followed the pseudo-second-order kinetic model. Effects of both initial pH and adsorbent dosage on the adsorption of MO were remarkable in experimental conditions.
一种新型的可分离吸附剂，即磁性γ-Fe(2)O(3)/交联壳聚糖复合材料（Mgamma-Fe(2)O(3)/CSCs），通过微乳液法制备，并通过 XRD、FT-IR、TGA、DSC、SEM 和 VSM 进行了表征。考察了 Mgamma-Fe(2)O(3)/CSCs 对水溶液中甲基橙（MO）作为模型污染物的吸附性能。表征结果表明，磁性γ-Fe(2)O(3)纳米粒子已被引入 Mgamma-Fe(2)O(3)/CSCs 中，并保持了固有磁性能。通过改变γ-Fe(2)O(3)的添加量，可以方便地调节 Mgamma-Fe(2)O(3)/CSCs 的饱和磁化强度（sigma(s)）。吸附结果表明，与交联壳聚糖相比，当γ-Fe(2)O(3)与壳聚糖的重量比为 1:10 和 2:5 时，两种纳米复合材料吸附剂都具有更高的吸附容量，并在更短的时间内达到吸附平衡。吸附后，通过施加外加磁场，Mgamma-Fe(2)O(3)/CSCs 在 10s 内可从反应溶液中有效分离。MO 在 1:10 Mgamma-Fe(2)O(3)/CSCs 上的吸附动力学符合准二级动力学模型。在实验条件下，初始 pH 值和吸附剂用量对 MO 的吸附均有显著影响。
