Department of Biological Science and Technology, China Institute of Technology, Taipei, Taiwan 115, ROC.
Environ Technol. 2009 Dec 1;30(13):1343-50. doi: 10.1080/09593330902858914.
The competitive adsorption effect by chitosan bead and alpha-cyclodextrin-linked chitosan bead on a mixture of six phthalate esters (PAEs) was investigated. The adsorption efficiency of short-chain hydrophilic PAEs was reduced when long-chain hydrophobic PAEs co-existed in the solution. Moreover, the adsorption efficiency of adsorbents for PAE is correlated to the distribution ratio (Kd), which shows that the Kd of hydrophobic PAEs is higher than that of hydrophilic PAEs. Both chitosan bead and alpha-cyclodextrin-linked chitosan bead exhibit the same phenomenon. The effect of alpha-cyclodextrin (CD)-linked chitosan bead is more significant compared with that of chitosan bead. Furthermore, it is observed that both adsorbents spontaneously adsorb PAEs by free energy (deltaG0), but the hydrophilic PAE co-existing with DMP (dimethyl phthalate) results in less entropy (deltaS0) change compared with a hydrophobic PAE co-existing with DMP. In a continuous system to treat a PAE mixture, hydrophobic PAE shows a higher breakthrough capacity than hydrophilic PAE. Moreover, the competitive adsorption results in the laboratory were comparable with those in field studies.
研究了壳聚糖珠和α-环糊精键合壳聚糖珠对六种邻苯二甲酸酯（PAEs）混合物的竞争吸附作用。当长链疏水性 PAEs 共存于溶液中时，短链亲水性 PAEs 的吸附效率降低。此外，吸附剂对 PAE 的吸附效率与分配比（Kd）相关，表明疏水性 PAEs 的 Kd 高于亲水性 PAEs。壳聚糖珠和α-环糊精键合壳聚糖珠均表现出相同的现象。与壳聚糖珠相比，α-环糊精（CD）键合壳聚糖珠的效果更为显著。此外，观察到两种吸附剂通过自由能（ΔG0）自发吸附 PAE，但与 DMP（邻苯二甲酸二甲酯）共存的亲水性 PAE 的熵（ΔS0）变化小于与 DMP 共存的疏水性 PAE。在处理 PAE 混合物的连续系统中，疏水性 PAE 的穿透容量高于亲水性 PAE。此外，实验室中的竞争吸附结果与现场研究结果相当。
