RAW KENAF BAST FIBER AS A GREEN BIOADSORBENT FOR CATIONIC AND ANIONIC DYES

摘要

The overall aim of this study was to evaluate the effectiveness of raw Kenaf Bast Fiber (KBF) to remove methylene blue (MB), rhodamine B (Rh. B), congo red (CR) and methyl orange (MO) dyes from aqueous solutions and simulated wastewater using batch adsorption system. The effects of solution pH, initial dye concentration and adsorbent dosage on removal of dyes were investigated. The adsorption capacity of raw KBF for MB, Rh. B, CR and MO was greatly influenced by initial dye concentration and amount of adsorbent dosage. The best pH value for adsorption of CR, MO and Rh. B was recorded at pH 2.0, while the maximum adsorption for MB was obtained at pH 6.0. The equilibrium data were analyzed by the Langmuir and Freundlich isotherm models. The adsorption of cationic and anionic dyes onto raw KBF was best described by the Freundlich isotherm model. Scanning Electron Microscope (SEM) and Fourier Transform Infrared Spectrometer (FTIR) were used to characterize raw KBF. Interaction with dyes has changed the surface morphology and shifted the wavenumbers of functional groups present in raw KBF. In multi-dye system, MB was the dye most removed by raw KBF. Overall, results from this study highlight the great potential of raw KBF as a natural bioadsorbent for the removal of toxic dyes in wastewater.