견운모에 흡착된 니켈이온의 탈착과 재생특성에 관한 연구가 최적의 탈착제로서 선정된 $HNO_3$를 이용하여 수행되어졌다. 견운모에 흡착된 니켈이온의 탈리는 주사전자현미경과 에너지 분산형 X선 분광기에 의해서 확인 되어졌다. 20 mM의 농도에서 니켈이온의 탈착율은 100%였다. 또한, 투입된 흡착제의 양과 탈착제의 부피로서 정의되는 S/L비가 1.0내에서는 니켈이온은 완전히 탈착 되어졌으며 탈착 공정은 60분내에 빨리 일어났다. 마지막으로 재사용된 견운모를 이용하였을 때 4회까지는 니켈이온의 탈착율이 일정하게 유지되었다.
Desorption characteristics for ions adsorbed onto sericite was performed by means of $HNO_3$ solution which was selected as the best desorbing agent in the previous work. Elution of nickel ions adsorbed onto sericite using $HNO_3$ solution was confirmed by means of scanning electron microscopy (SEM) & energy dispersive X-ray spectroscopy (EDX) analysis. Desorption efficiency for nickel ions was 100% at the 20 mM of concentration. Also, nickel ions was completely desorbed within 1.0 of S/L (mg/mL) ratio which is defined as the ratio of adding amount of adsorbent and volume of desorbing agent and desorption process was quickly carried out within 60min. Finally, removal efficiency of reused sericite for nickel ions was constantly maintained until the 4th cycle.
