Evaluation of zeolites synthesized from fly ash as potential adsorbents forwastewater containing heavy metals
WANG Chunfeng , LI Jiansheng , SUN Xia , WANG Lianjun , SUN Xiuyun
DOI:
Received March 03, 2008,Revised May 18, 2008, Accepted , Available online
Volume 21,2009,Pages 127-136
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The pure-form zeolites (A and X) were synthesized by applying a two-stage method during hydrothermal treatment of fly ash
prepared initial Cu and Zn gel. The di erence of adsorption capacity of both synthesized zeolits was assessed using Cu and Zn as target
heavy metal ions. It was found that adsorption capacity of zeolite A showed much higher value than that of zeolite X. Thus, attention
was focused on investigating the removal performance of heavy metal ions in aqueous solution on zeolite A, comparing with zeolite
HS (hydroxyl-solidate) prepared from the residual fly ash (after synthesis of pure-form zeolite A from fly ash) and a commercial grade
zeolite A. Batch method was used to study the influential parameters of the adsorption process. The equilibrium data were well fitted
by the Langmuir model. The removal mechanism of metal ions followed adsorption and ion exchange processes. Attempts were also
made to recover heavy metal ions and regenerate adsorbents.
