离子交换纤维上氰配合物解吸性能的研究

Desorption properties of metal cyanide on ion exchange fiber

离子交换纤维作为有潜力的吸附剂被应用,不仅在于其吸附速度,而且在于其解吸性能和重复实用性。主要以硫酸、氨水作为解吸剂,对吸附在强碱性离子交换纤维上的金属氰配合物的解吸性能进行了初步研究。实验结果表明:6%的硫酸20 m in就可使80%的Zn(CN)42-顺利地从纤维上洗脱下来,但对Cu(CN)42-的洗脱效果却不明显;氨水30 m in洗脱纤维上的Cu(CN)42-的洗脱率也达到85%以上,酸化后氰的回收率也可达85%以上,氨水解吸后,纤维上的活性基团为OH-,因此洗脱后的纤维不需要再生,直接进入后续吸附过程。离子交换纤维的解吸实验表明,离子交换纤维可有效处理含氰废水。

Ion-exchange fiber as a latent capacity adsorption material is widely used not only for its adsorption speed, but also for desorption and repeat practical properties. The desorption properties of Zn （CN）4^2-, Cu （CN）4^2- on the strong alkaline ion-exchange fiber is preliminarily studied by H2SO4, NH3H2O as desorption reagents. The experimental results indicate that 6% H2SO4 could successfully desorpte Zn（CN）4^2- above 80% from fiber for 20 min,but the effect was not noticeable to Cu（CN）4^- ;10% NHsH20 could successfully desorpte above 85% to Cu（CN）4^- for 30 min,after desorpted by NHsH20, active parts on fiber is subsisted for OH ~ , so fiber must not regenerate, and directly getted into adsorption process. The fiber desorption experiments shows that strong alkaline ion-exchange fiber can treat cyanidecontaining wastewater effectively.