Fe_(3)O_(4)基β-环糊精聚合物的制备及吸附性能

Facile Fabrication of Fe_(3)O_(4)-Based β-Cyclodextrin Polymers and Its Adsorption Performances

以β-环糊精(β-CD)为单体、环氧氯丙烷为交联剂,在碱性介质中合成了Fe_(3)O_(4)改性的β-环糊精聚合物(β-CDP@Fe_(3)O_(4))。在静态和动态条件下,研究了β-CDP@Fe_(3)O_(4)对双酚A (BPA)的吸附性能。静态实验结果表明,采用0.10 g β-CDP@Fe_(3)O_(4)对100 mg/L BPA(pH=5.6)吸附,其平衡吸附量为45.600 mg/g,吸附率为91.3%,饱和吸附量为113.600 mg/g。动态实验结果表明,液时空速越小,吸附剂利用率越高,且随着BPA质量浓度的增加,吸附穿透时间和饱和时间均呈下降趋势。同时,探讨了β-CDP@Fe_(3)O_(4)的合成及吸附机理。β-CDP@Fe_(3)O_(4)对BPA的快速吸附是通过氢键和疏水作用实现的。β-CDP@Fe_(3)O_(4)具有良好的再生性能,经过6次静态吸附-解吸循环和3次动态吸附-解吸循环后,吸附性能均无明显变化。

cyclodextrin polymers modified with Fe_(3)O_(4)(β-CDP@Fe_(3)O_(4)) was synthesized in alkaline medium using β-cyclodextrin(β-CD) as monomer and epichlorohydrin as crosslinker. The adsorption performances of β-CDP@Fe_(3)O_(4)on bisphenol A(BPA)under static and dynamic conditions were investigated. The results of static experiment show that the adsorption performance of 100 mg/L BPA(pH=5.6) is best at 0.10 g β-CDP@Fe_(3)O_(4). At this point, the equilibrium adsorption capacity, adsorption rate and the maximum adsorption capacity are 45.600 mg/g, 91.3%, and 113.600 mg/g, respectively. The results of dynamic experiment show that the smaller the liquid hourly space velocity, the higher the adsorbent utilization rate, and with the increase of BPA concentration, the adsorption breakthrough time and saturation time are declined. At the same time, the synthesis and adsorption mechanism of β-CDP@Fe_(3)O_(4)were discussed. A rapid adsorption rate for the removal of BPA onto β-CDP@Fe_(3)O_(4)from water solution was achieved, and the adsorption process was mainly due to hydrogen bond and hydrophobic interaction. β-CDP@Fe_(3)O_(4)has good regenerative performance, through 6 cycles of static adsorption-desorption, and 3 cycles of dynamic adsorption-desorption without significant changes in adsorption performance.