Phytoremediation Potential of Hibiscus rosa-sinesis for Removal of Methylene Blue Dye and its Kinetic, Adsorption Studies in Aquatic System

Abstract

Phytoremediation technology emerges as a green, environmentally friendly and cutting-edge technology in last ten decades, which provides an economical solution for removing dyes from wastewater. In current study, the terrestrial plant Hibiscus rosa-sinesis L. explored for remediating the triarylmethane dye as methylene blue including the various parameters viz. initial dye concentration (10 mg L-1), pH (3-10), contact time (8 to 40 h) from synthetic wastewater. On assessment of these various parameters, the maximum percentage decolourizations were recorded as 86 (10 mg L-1) and 75 (20 mg L-1) at favourable pH 6. The kinetics studies were best fitted to pseudo-first order with the correlation value R2 ≥ 0.96. The Langmuir adsorption isotherm proved more favourable with R2 ≥ 0.99. Fourier transform infrared spectroscopy (FTIR) confirmed the adsorption of methylene blue dye by H. rosa-sinesis. Hence, this plant can be used for remediation of dyes from wastewater.