Química Nova | |
Heavy metals removal from wastewater by the natural zeolite scolecite - temperature and pH influence in single-metal solutions | |
Carvalho, Wagner Alves1  Jimenez, Ricardo Sarti1  Pontifícia Universidade Católica de Campinas, Campinas1  Dal Bosco, Sandra Maria1  | |
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 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】
Unknown
【 预 览 】
Files | Size | Format | View |
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RO201912050593177ZK.pdf | 302KB | download |