Removal of Cu (II) and Zn (II) from water with natural adsorbents from cassava agroindustry residues
| Autor: | Marcelo Gonçalves dos Santos, Daniel Schwantes, Eduardo Ariel Völz Leismann, Gustavo Ferreira Coelho, Alisson Junior Miola, Affonso Celso Gonçalves |
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| Rok vydání: | 2015 |
| Předmět: |
Langmuir
General Computer Science toxic metals General Mathematics Metal ions in aqueous solution General Physics and Astronomy Remediação de metais tóxicos chemistry.chemical_compound Adsorption Adsorção Point of zero charge Cellulose lcsh:Science (General) General Engineering Environmental engineering Biosorption Sorption Química water contamination General Chemistry decontamination Solid residue chemistry adsorption lcsh:TA1-2040 biosorbent General Earth and Planetary Sciences lcsh:Engineering (General). Civil engineering (General) Bagasse lcsh:Q1-390 Nuclear chemistry |
| Zdroj: | Acta Scientiarum: Technology, Vol 37, Iss 3, Pp 409-417 (2015) Acta Scientiarum. Technology; Vol 37 No 3 (2015); 409-417 Acta Scientiarum. Technology; v. 37 n. 3 (2015); 409-417 Acta scientiarum. Technology Universidade Estadual de Maringá (UEM) instacron:UEM |
| ISSN: | 1807-8664 1806-2563 |
| DOI: | 10.4025/actascitechnol.v37i3.26809 |
| Popis: | Current study employs solid residues from the processing industry of the cassava ( Manihot esculenta Crantz) (bark, bagasse and bark + bagasse) as natural adsorbents for the removal of metal ions Cu(II) and Zn(II) from contaminated water. The first stage comprised surface morphological characterization (SEM), determination of functional groups (IR), point of zero charge and the composition of naturally existent minerals in the biomass. Further, tests were carried out to evaluate the sorption process by kinetic, equilibrium and thermodynamic studies. The adsorbents showed a surface with favorable adsorption characteristics, with adsorption sites possibly derived from lignin, cellulose and hemicellulose. The dynamic equilibrium time for adsorption was 60 min. Results followed pseudo-second-order, Langmuir and Dubinin-Radushkevich models, suggesting a chemisorption monolayer. The thermodynamic parameters suggested that the biosorption process of Cu and Zn was endothermic, spontaneous or independent according to conditions. Results showed that the studied materials were potential biosorbents in the decontamination of water contaminated by Cu(II) and Zn(II). Thus, the above practice complements the final stages of the cassava production chain of cassava, with a new disposal of solid residues from the cassava agroindustry activity. |
| Databáze: | OpenAIRE |
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