Journal
QUIMICA NOVA
Volume 32, Issue 6, Pages 1378-1383Publisher
SOC BRASILEIRA QUIMICA
DOI: 10.1590/S0100-40422009000600003
Keywords
rice husk ash; removal; Zn (II)
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USE OF RICE HUSK ASH (RHA) OBTAINED FROM THERMAL ENERGY GENERATION AS Zn (II) ADSORBENT IN AQUEOUS SOLUTIONS. The removal study was conducted using 1.00 g of the rice husk ash (RHA) and 20.0 mL solution with Concentrations in the range of 10-1000 mg/L of Zn(II). The influence of contact time, initial metal concentration, agitation and pH of the removal process was investigated. Superior removals to 95% were obtained at the end of 24 h of contact. The agitation increased in 20% the removal of Zn(II), being needed only 5 min to reach the equilibrium. The adsorption process was studied by the models of isotherms of Langmuir. Freundlich and BET, obtaining results of R-L and l/n for a process favorable of adsorption. BET isotherm best represents the equilibrium adsorption. The results showed that the RHA has the largest capacity and affinity for the removal of Zn(II).
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