Biosorption of Dyes by Brown Algae

PLAZA CAZÓN JOSEFINA; DONATI EDGARDO

Strategies for Bioremediation of Organic and Inorganic Pollutants

CRC Press

Año: 2017; p. 74 - 86

This chapter describes the RB5 dye sorption from artificial solutions using biomasses of two brown algae, Macrocystis pyrifera and Undaria pinnatifida. Different assays were conducted in order to determine the kinetics for the biosorption process (the equilibrium state was reached after 400 min) and the best experimental conditions for the sorption. CaCl2-treated biomass showed higher dye removal than HCl-treated or non-treated biomass. Percentage of dye removal increased from 20% to 99% for 0.1 g to 0.6 g of biosorbent, respectively. In addition, the removal increased at lower pH being maximum at pH 1. The maximum adsorption capacity (26.31 mg g?1) on M. pyrifera biomass was much higher than that on U. pinnatifida biomass (12.64 mg g?1). Desorption was possible increasing the pH achieving the maxium recovery (100 %) at pH 12; in this way, M. pyrifera and U. pinnatifida biomasses could be repeatedly used as sorbents for RB5 dye.