TITLE:
Biosorption of Trivalent Chromium from Aqueous Solution by Red Seaweed Polysiphonia nigrescens
AUTHORS:
Patricia Blanes, Cong Cong, Adriana Cortadi, María Frascaroli, Martha Gattuso, Silvia García, Juan González, Masafumi Harada, Cristina Matulewicz, Yasuhiro Niwa, Héctor Prado, Luis Sala
KEYWORDS:
Seaweed Polysiphonia nigrescens, Biosorption, Chromium, Isotherms, Kinetics Parameters
JOURNAL NAME:
Journal of Water Resource and Protection,
Vol.3 No.11,
November
24,
2011
ABSTRACT: This paper presents the biosorption of chromium onto red seaweed (Polysiphonia nigrescens). Batch mode experiments were performed to determine experimental parameters affecting sorption process such as pH, contact time, initial metal ion concentration and biomass dosage. The Cr(III) sorption was dependent on pH and adsorbent dosage. The adsorption kinetic data could be fitted with a pseudo-second-order model and the equilibrium data with a Langmuir model. The maximum sorption capacity was of 16.11 mg/g at pH 4 and 10 g/L of biomass dosage. 0.1 M H2SO4 showed good desorption efficiency (>80%). Spectroscopy analysis showed that Cr(III) sorption on seaweed was mainly through the ion-exchange mechanism. This report indicates that P. nigrescens is an effective and economical sorbent for removal of Cr(III) from wastewaters.