Heavy metals removal from wastewater by the natural zeolite scolecite - temperature and pH influence in single-metal solutions

Quimica nova

Carvalho, Wagner Alves¹  Jimenez, Ricardo Sarti¹  Dal Bosco, Sandra Maria¹ 

[1] Pontifícia Universidade Católica de Campinas, Campinas

关键词: cation exchange;    heavy metals;    scolecite.;   

DOI  :  10.1590/S0100-40422004000500011

学科分类：化学（综合）

来源: Sociedade Brasileira de Quimica

【 摘 要 】

Cation exchange capabilities of a Brazilian naturalzeolite, identified as scolecite, were evaluated for application in wastewatercontrol. We investigated the process of sorption of chromium(III), nickel(II),cadmium(II) and manganese(II) in synthetic aqueous effluents, including adsorptionisotherms of single-metal solutions. The natural zeolite showed the abilityto 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 radiusof 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 theadsorption increased substantially when the temperature was raised to 60 ºCand that maximum adsorption capacity was observed at pH 6. These results demonstratethat scolecite can be used for removal of heavy metals from aqueous effluents,under optimized conditions.

【 授权许可】

CC BY