Equilibrium and Kinetic Studies for Basic Yellow 11 Removal by Sargassum binderi

Dyes have been widely used in many industries such as textile, paint and also ink industry. Discharge of dyes from these industries need to undergo treatment prior of disposal to avoid ecosystem to be devastated. Upon this, Sargassum binderi, a species of brown seaweed was used as a low cost biosorbent to remove a basic dye, Basic Yellow 11 (BY11). Various parameters such as pH, initial concentration and sorbent dosage were conducted using batch sorption process. In this study, S. binderi exhibited good performance (almost 100% of BY11 removal) with 1 g of sorbent dosage in 100 mg L(-1) of dye solution. pH of the solution, however, does not seem to have high influence on removal of BY11. Langmuir, Freundlich and Temkin isotherm models were used to study sorption behaviors of S. binderi at equilibrium stage. From the analysis, the sorption of BY11 onto the S. binderi was found obeyed Freundlich model with coefficient correlation (R(2)) value of 0.9959 which indicates heterogeneous layers of sorption. The Freundlich constant, K(F) and n values obtained were 32.46 mg g(-1) (L mg(-1))(1/n) and 1.968, respectively. Value of Freundlich component, n, was more than 1 indicates favourable adsorption process of this system. The kinetic sorption of BY11 using S. binderi were analyzed by using pseudo-first-order, pseudo-second-order and intraparticular diffusion model. The sorption process followed pseudo-second-order kinetic which involved chemisorption. Calculated q(e) values from pseudo-second-order kinetic model were found fitted well with the experimental q(e) values. Each R(2) values from linear regression line of pseudo-second-order kinetic model were more than 0.99. In this study, S. binderi was proven to have high sorption efficiency towards BY11 and thus, it can be categorized as one of the promising biosorbent to be applied in treating the effluent discharge from industries.