Remoção de metais pesados de efluentes aquosos pela zeólita natural escolecita - influência da temperatura e do pH na adsorção em sistemas monoelementares

Química Nova

Ricardo Sarti Jimenez¹  Sandra Maria Dal Bosco¹  Wagner Alves Carvalho¹ 

[1] ,Pontifícia Universidade Católica de Campinas Faculdade de Química Centro de Ciências Exatas, Ambientais e de TecnologiasCampinas SP

关键词: cation exchange;    heavy metals;    scolecite;   

DOI  :  10.1590/S0100-40422004000500011

来源: SciELO

【 摘 要 】

Cation exchange capabilities of a Brazilian natural zeolite, identified as scolecite, were evaluated for application in wastewater control. We investigated the process of sorption of chromium(III), nickel(II), cadmium(II) and manganese(II) in synthetic aqueous effluents, including adsorption isotherms of single-metal solutions. The natural zeolite showed the ability to take up the tested heavy metals in the order Cr(III) > Cd(II) > Ni(II) > Mn(II), and this could be related to the valence and the hydration radius of the metal cations. The influence of temperature (25, 40 and 60 ºC) and initial pH value (from 4 to 6) was also evaluated. It was found that the adsorption increased substantially when the temperature was raised to 60 ºC and that maximum adsorption capacity was observed at pH 6. These results demonstrate that scolecite can be used for removal of heavy metals from aqueous effluents, under optimized conditions.

【 授权许可】

CC BY-NC   
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