Adsorption of Methylene Blue From Aqueous Solution by Banana Pseudo Stem Biochar

Noor Halini Baharim; Fridelina Sjahrir; Rahmad Mohd Taib; Norazlina Idris; Tuan Azmar Tuan Daud

Noor Halini Baharim Faculty of Engineering and Life Sciences, Universiti Selangor
Fridelina Sjahrir Faculty of Engineering and Life Sciences, Universiti Selangor
Rahmad Mohd Taib Faculty of Engineering and Life Sciences, Universiti Selangor
Norazlina Idris Faculty of Engineering and Life Sciences, Universiti Selangor
Tuan Azmar Tuan Daud Faculty of Engineering and Life Sciences, Universiti Selangor

Keywords: Adsorption, Banana pseudo stem, Biochar, Methylene blue

Abstract

In this study, the adsorption of methylene blue dye from an aqueous solution onto banana pseudo stem biochar prepared via slow pyrolysis at 500 °C was examined. The influence parameter of solution pH, initial concentration of methylene blue solution, adsorbent dosage and contact time on the methylene blue removal and the amount of adsorbate adsorbed were determined by batch adsorption experiments. The highest removal efficiency was obtained at solution pH 6, initial methylene blue concentration of 25 ppm, adsorbent dosage of 0.25 g within 90 minutes. The amount of methylene blue adsorbed was increased from 6.77 – 52.04 mg/g as the initial concentration increased from 25 ppm to 150 ppm. The adsorption isotherm studies show the equilibrium adsorption experimental data were well fitted to the Freundlich isotherm model. Meanwhile, the adsorption kinetics was excellently fitted to pseudo-second order model. The maximum adsorption capacity was found at 55.25 mg/g. The results indicate biochar derived from banana pseudo stem showed great potential as an efficient adsorbent for removing methylene blue from aqueous solution.

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