Removal of 4-Nitrophenol from Aqueous Solution by Brachystegia Eurycoma Seed Hull Impregnated with Titanium Oxide (TiO2) using Solid-phase Extraction Method

Shuaibu Musa Abubakar, Mustapha Abdullahi, Shuaibu Musa, and Garba, A. Y

ABSTRACT


Abstract
The efficiency of Brachystegia Eurycoma Seed Hulls impregnated with Titanium dioxide (BESH/TiO2) for the removal of 4-Nitrophenol from aqueous solution was evaluated. The study employed standard solutions of 4-Nitrophenol and different amounts of BESH/TiO2. Parameters such as initial concentration of 4-Nitrophenol, Time, pH, temperature and adsorbent dosage were optimized, and the data generated were fitted into Langmuir and Freundlich models. The results in this study revealed that 0.5g of BESH/TiO2 can effectively accomplish 98% removal efficiency of 4-Nitrophenol at pH 12, 50 minutes contact time, temperature of 25°C and 8 mg/L concentration of 4-Nitrophenol. However, the adsorption data did not fit into Freundlich isotherm (n = 0.77), but followed Langmuir isotherm (RL = 0.0292), indicating that the system is Langmuir model controlled. These results have established the conditions at which BESH/TiO2 can be used for the removal of 4-Nitrophenol from aqueous solution, and could be helpful in environmental phytoremediation applications.
Keywords: adsorption, % removal, Langmuir plot, isotherms