Abstract
This study investigated the biosorption efficiency of sodium hydroxide modified African Border tree (SMABT) bark powder on Safranin O, a cationic dye. The SMABT was characterized by Fourier Transform Infrared Spectroscopy (FTIR). As the initial dye concentration increased, the amount of Safranin O removed increased. The kinetic studies were described by pseudo first order and pseudo second order. The pseudo second order fitted very well into the kinetic experimental data. Freundlich, Langmuir, Temkin and Dubinin–Radushkevich (D–R) models were employed to describe the adsorption of Safranin O to SMABT and also to evaluate the isotherm constants. Langmuir model was the best of the four to excellently fit into the experimental data. The maximum uptake capacity of SMABT for Safranin O dye was 90.9 mg/g. Keywords: African Border Tree, kinetics, equilibrium, adsorption, Safranin O
Highlights
Anion adsorption is favoured at pH values lower than the pH point of zero charge (pHPZC) while cation adsorption is favoured by pH values higher than the pHPZC (Farahani et al 2011)
The pHpzc obtained for study chemically modified African Border Tree (SMABT) was 8
When the pHPZC is higher than the pH value, the Safranin O dye is of monomeric molecular and cationic forms (Deshpande et al, 2002)
Summary
Rapid industrialization has increase the presence of dyes in the environment. The dye effluents from these industries result in coloured wastewater. Among the various methods of dye removal, the use of agricultural materials, known as biosorption, has been proven to be superior since it is more cost effective, efficient, readily available, generates no sludge or by products. African border tree is known as Newbouldia laevis with lush, tropical looking leaves and pink flower. It belongs to the shrub category and the family Bignoniaceae. In this study chemically modified African Border Tree (SMABT) was used to remove Safranin O, a cationic basic dye, from simulated waste water
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