Green valorization of Arisarum vulgare O. Targ. Tozz: A sustainable approach for removing Basic Yellow 28 dye from aqueous solutions

The present work consists of studying the effectiveness of Arisarum vulgare O. Targ. Tozz leaves treated in hot water at 100°C for the removal of Basic Yellow 28 textile dye from aqueous solutions. The biomaterial was characterised by physico-chemical analyses such as FX, DRX, FTIR, SEM and pHzpc. The experiments were performed in batch mode to determine the the influencing of various system parameters, such as pH, adsorbent mass, initial dye concentration, temperature and ionic strength. The experimental results were modelled using the kinetic equations of pseudo-first-order, pseudo-second-order and the intra-particle diffusion model. The kinetic data is well described by the pseudo-second-order kinetic model, with a correlation coefficient value R2 closed to unity with diffusion in the liquid film. The equilibrium data were analyzed by Langmuir, Freundlich, Temkin and Dubinin-Radushkevich isotherm models, and showed that the Langmuir model provides a good description of the adsorption process, with a retention of the Basic yellow 28 molecules in monolayers on the surface of the adsorbent with a maximum adsorption capacity of 127.322 mg/g. The thermodynamic parameters show that the adsorption process is spontaneous and exothermic. The treated leaves of Arisarum vulgare O. Targ. Tozz can be used as a low-cost adsorbent to remove textile dyes.