摘要
利用过硫酸铵作为氧化剂,在壳聚糖(Chi)中用对苯二胺(PPPDA)原位化学氧化聚合反应制备聚(对苯二胺)/壳聚糖复合材料。在添加铜前后,利用FT-IR光谱和SEM表征对苯二胺和对苯二胺/壳聚糖复合材料。利用振荡吸附法,采用1 g/L对苯二胺和对苯二胺/壳聚糖复合材料,在PPPDA和PPPDA/Chi复合材料的pH分别为5.0和6.0的条件下,吸附360 min,可以得到最大的铜去除量。PPPDA显示最大吸附量为650 mg/g,而复合材料的吸附量达到573 mg/g。实验数值与Freundlich等温方程和伪二阶动力学模型吻合良好。含铜的对苯二胺及其复合材料可以被有效地再利用4个循环。相对于无吸附的状态,吸附获得的铜具有高的革兰氏阳性和革兰氏阴性菌抑菌效果。
Poly(p-phenylenediamine)/chitosan (PPPDA/Chi) composite was prepared by in situ chemical oxidative polymerization of p-phenylenediamine (PPPDA) into chitosan (Chi) using ammonium persulphate (APS) as an oxidant. PPPDA and PPPDA/Chi composite were characterized by FT-IR spectra and SEM before and after copper loading. In batch adsorption method, the maximum removal of copper was experienced when 1 g/L of PPPDA and PPPDA/Chi composite dosages were used at pH 5.0 for PPPDA and 6.0 for PPPDA/Chi composite for 360 min for both sorbents. PPPDA showed adsorption capacity q<sub>e</sub><sup>max</sup> of 650 mg/g whereas its composite achieved q<sub>e</sub><sup>max</sup> of 573 mg/g. The experimental data correlate well with the Freundlich isotherm equation and the pseudo-second order kinetic model. The Cu(II), loaded PPPDA and its composite can be efficiently reused for as many as four cycles. The Cu(II)-loaded sorbents showed high antibacterial efficiency against Gram-positive and Gram-negative bacteria than their unloaded forms.
