Cu(II) adsorption from aqueous solution using red mud activated by chemical and thermal treatment

Brazil is the third-largest producer of aluminium, with the red mud generated during the extraction of aluminium from bauxite through the Bayer process. The red mud has been studied for use as an adsorbent for removing of elements/compounds from wastewater and/or contaminated soil. However, there ar...

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Bibliographic Details
Published in:Environmental earth sciences 2016-03, Vol.75 (5), p.1-7, Article 362
Main Authors: da Conceição, Fabiano T., Pichinelli, Beatriz C., Silva, Mariana S. G., Moruzzi, Rodrigo Braga, Menegário, Amauri Antonio, Antunes, Maria Lucia Pereira
Format: Article
Language:English
Subjects:
Adsorbents
Adsorption
Aluminum
Aluminum industry
Biogeosciences
Chemical treatment
Copper
Earth and Environmental Science
Earth Sciences
Environmental Science and Engineering
Extraction processes
Geochemistry
Geology
Hydrochloric acid
Hydrology/Water Resources
Industrial pollution
Isotherms
Metal concentrations
Metal oxides
Mud
Original Article
Soil contamination
Terrestrial Pollution
Wastewater treatment
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Summary:Brazil is the third-largest producer of aluminium, with the red mud generated during the extraction of aluminium from bauxite through the Bayer process. The red mud has been studied for use as an adsorbent for removing of elements/compounds from wastewater and/or contaminated soil. However, there are several compounds and treatments that were not tested yet. In this study, the Cu(II) adsorption potential for natural red mud (NRN) and red mud activated by thermal treatment at 400 °C (TRM) and chemical treatment with hydrochloric acid (HCl) at 0.05 mol L −1 (CRM1) and calcium nitrate [Ca(NO 3 ) 2 ] 0.1 mol L −1 (CRM2) was evaluated using adsorption isotherms obtained by the Langmuir and Freundlich models. The NRM and TRM presented Cu(II) adsorptions of ca. 100 % in aqueous solution with lower concentrations of the metal (0.5 and 1.0 mmol 25 mL −1 ). The Langmuir isotherm was more appropriate to describe the phenomenon of Cu(II) removal using NRM, TRM, CRM1 and CRM2, with the thermally activated red mud presenting the highest adsorption capacity at 2.08 mmol g −1 for Cu(II). Thus, these results indicate that TRM has the potential for use in applications that treat effluents and/or contaminated soil from industrial activity.
ISSN:1866-6280
1866-6299
DOI:10.1007/s12665-015-4929-y