PAN基羧酸离子交换纤维从电镀废水中回收镍和铜的研究

Recovery of Nickel and Copper from Plating Wastewater with Weak Acid Ion Exchange Fibers

系统研究了PAN基弱酸离子交换纤维在多离子共存体系中对Ni^(2+)/Cu^(2+)的选择吸附性能。以此为基础,通过多柱串联、饱和吸附、洗脱液套用方法完成了对Ni^(2+)、Cu^(2+)电镀废水的资源化治理研究。结果表明:PAN基弱酸纤维对Ni^(2+)、Cu^(2+)离子具有吸附速度快(0.55~1.50 m L×g-1×min-1)、交换容量高(Ca^(2+)、Mg^(2+)共存体系中对Ni^(2+)、Cu^(2+)吸附容量分别达139和148 mg×g-1)、选择性能好等优点,回收得到的溶液中镍和铜离子的浓度和纯度高(分别为45.15和39.17g×L-1且CNi(II)/Ctota L=0.989,CCu(II)/Ctota L=0.994)。离子交换纤维经200次吸附-洗脱循环后,其交换容量基本不变,显示出优异的实际应用前景。

Selective adsorption of Ni^2＋/Cu^2＋ from a multi-ion coexist system was studied by using PAN-based weak acid ion exchange fibers as adsorbent. A recovery process combining multi-column series, saturated adsorption and elutriation liquid reuse was developed for the treatment of Ni/Cu containing wastewater. The results show that the fibrous ion exchanger has advantages of fast adsorption（0.55-1.50 m L·g^-1·min^-1 high exchange capacity（139 or 148 mg·g^-1 for Ni^2＋/Cu^2＋ from Ca^2＋ and Mg^2＋ coexisting systems） and excellent selectivity, and the concentration and purity of Ni^2＋/Cu^2＋ in the recovered elutriation liquid are 45.15 g·L^-1 or 39.17 g·L^-1 with CNi（II）/Ctotal = 0.989 and CCu（II）/Ctotal = 0.994, respectively. The fiber still has excellent adsorption performance after 200 adsorption-regeneration cycles, which shows that this fiber has good prospects for practical application.