Fluoride adsorption on carboxylated aerobic granules containing Ce(III).
Bioresour Technol
; 127: 106-11, 2013 Jan.
Article
em En
| MEDLINE
| ID: mdl-23131629
ABSTRACT
Aerobic granules (AG) were carboxylated and Ce(III) was incorporated to obtain modified granuels (Ce(III)-MAG) for removal of fluoride from aqueous solutions. The Ce(III)-MAG was characterized by SEM, FTIR, XRD and pH(pzc), and the introduction of carboxyl groups and Ce(III) was confirmed. The adsorption capacity of Ce(III)-MAG for fluoride was 45.80 mg/g at neutral pH, an increase of 359% compared to the capacity of pristine AG. Adsorption was highest at pH range of 3.0-5.0. A positive effect on fluoride removal in the order of K(+) ≈ Mg(2+) > Ca(2+) > Na(+) and a negative effect in the order of NO(3)(-) > Cl(-) > SO(4)(2-) > HCO(3)(-) > PO(4)(3-) was observed. Fluoride adsorption followed the Redlich-Peterson model and the pseudo-first order model with correlation factors of 0.999 and 0.950, respectively. Ce(III)-MAG held up to 790 bed volumes and the effluent fluoride concentration remained below 1.0mg/L (influent fluoride 10mg/L).
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Base de dados:
MEDLINE
Assunto principal:
Bactérias Aeróbias
/
Poluentes Químicos da Água
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Cério
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Purificação da Água
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Fluoretos
Idioma:
En
Ano de publicação:
2013
Tipo de documento:
Article