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Biosorption parameters: carob kibbles (Ceratonia Siliqua) as a potential biosorbent for boron removal from aqueous solutions
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Resumo(s)
This work aimed to investigate the removal of boron by bioadsorption using carob
kibbles (Ceratonia siliqua L.) biomass, a by-product of a seed flour factory located in
Faro, Portugal. Batch experiments were carried out to evaluate the effect of several
parameters such as contact time, pH of the solution, initial boron concentration,
adsorbant dosage, temperature of the solution and particle size on boron removal. The
optimum contact time obtained was 300 min and the bioremoval is favored as the
solution pH increases. This removal was found to increase with an increase in the
adsorbent dosage. With an initial boron concentration of 100 mg/L, the maximum
percentage of removal (67 %) was achieved with the highest adsorbent dosage tested
(200 g/L). On the other hand, when using a fixed dosage of biosorbent (50 g/L) the
percentage of boron removal decreases as the initial boron concentration was raised
from 20 to 200 mg/L. The best removal temperature was 25 ºC and the particle size that
binded more boron from the aqueous solution was 0.025 mm.
Particle size distribution showed that the majority of biomass is within the sizes
between 0.025 and 0.106 mm.
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Palavras-chave
Bioadsorption Boron Carob kibbles