Characterization of RHA /PFA/CFA Adsorbent and Its Equilibrium and Kinetic Studies for Zn2+ Removal
Journal Title: Caspian Journal of Applied Sciences Research - Year 2012, Vol 1, Issue 13
Abstract
Zinc removal was investigated by adsorption using a mixture of rice husk ash (RHA), palm oil fuel ash (PFA) and coal fly ash (CFA). Sol-gel method was used in the preparation of RHA/PFA/CFA adsorbent. In this study, the physical and chemical characterization of RHA/PFA/CFA adsorbent was investigated to obtain a better understanding of zinc adsorption process. The particle size distribution of RHA/PFA/CFA adsorbent was found to have a variation as a result of the reaction during the preparation and during treatment processes. The SEM micrograph results revealed the structure of RHA/PFA/CFA adsorbent before and after the adsorption processes. X-ray diffraction analysis indicated the formation of component phases in the sorbent and NaNO3 became the major content in the RHA/PFA/CFA adsorbent. In addition, various specific surface functional groups were formed in the RHA/PFA/CFA adsorbent before and after the adsorption processes. Thus, it is concluded that the physical and chemical characteristics of RHA/PFA/CFA adsorbent affecting the adsorption of zinc. Also, equilibrium data were adapted to adsorption isotherm and kinetic studies. The equilibrium data were best described by Freundlich isotherm model. RL value which indicates the type of Langmuir isotherm is favorable for RHA/PFA/CFA adsorbent. For adsorption kinetic, the adsorption kinetics obeys a pseudo-second-order model.
Authors and Affiliations
Haider Zwain, Irvan Dahlan
Keywords
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