Sorption of crystal violet from aqueous solution using live roots of Eichhornia crassipes: Kinetic, isotherm, phyto and cyto-genotoxicity studies

Abstract In the present study, Water hyacinth (Eichhornia crassipes), a worst obtrusive aquatic weed has been utilized for biosorption of cationic dye, crystal violet from aqueous solutions. To evaluate the biosorption capacity, the effect of solution pH, initial dye concentration, and contact time were investigated. The pseudo-first, second order and intraparticle diffusion adsorption models were used for the mathematical description of the sorption equilibrium. Equilibrium data was fitted well to the pseudo second order kinetics at concentration 100 mgL−1. The equilibrium data were mathematically described using Freundlich, Langmuir, Dubinin-Radushkevitch (D-R) and Temkin isotherm models. The Freundlich isotherm model fitted well to the adsorption data with R 2 = 0 . 999 . UV-Vis and FT-IR analyses were performed to accomplish the decolorization of crystal violet from aqueous solution. In addition, phytotoxicity and cytotoxicity analyses were performed. The results indicated that the solution spawned were far less toxic than the crystal violet solution. Thus, it is demonstrating successful adsorption and decolorization of crystal violet dye from aqueous solution by Eichhornia crassipes. These results recommend that Eichhornia crassipes is effective in decolorizing crystal violet dye and could be auspicious in phytoremediation of dye contaminated waste water.