Removal of Crystal Violet dye from aqueous solution using water hyacinth: Equilibrium, kinetics and thermodynamics study

Effluent water from dyeing industries has now for long been a taxing issue. Of the various dyes which are extremely toxic, CrystalViolet which
is used in the dyeing industry is known for its mutagenic and mitotic poisoning nature.Water hyacinth (Eichhornia crassipes) is a perennial aquatic
plant notorious for its rapid invasive growth on the surface of water bodies causing ill-effects on the biodiversity. The potential of powdered roots
of water hyacinth was studied for decolorization of Crystal Violet dye. Influence of parameters such as initial pH (2.0–10.0), initial dye
concentration (100–500 ppm), biosorbent dosage (0.5–5 g/l), contact time (10–240 min) and temperature (300–323 K) were examined. Maximum
removal of dye was observed at pH 7.8. The obtained data were fit into different kinetic models and the biosorption was found to follow pseudo
second order kinetic model. The Langmuir monolayer biosorption capacity of water hyacinth was estimated as 322.58 mg/g. The study has
demonstrated water hyacinth as a potential low cost biosorbent for effective removal of Crystal Violet dye from aqueous solution.