Kahwa tea (Camellia sinensis) carbon — a novel and green low-cost adsorbent for the sequestration of Titan yellow dye from its aqueous solutions

The present study aims to explore the adsorption behavior of novel Kahwa tea (Camellia sinensis) carbon (KTC) towards its potential application as an adsorbent for the sequestration of Titan yellow (TY) dye from an aqueous solution. The maximum adsorption of TY from aqueous solution was observed at pH 5, contact time 180 min, initial concentration of dye 100 mg L–1 and temperature 318 K. The adsorption process follows a pseudo-second-order rate kinetic model and is in good agreement with the kinetic data. The equilibrium adsorption data fitted well with the Langmuir isotherm model with a maximum monolayer adsorption capacity of 55.55 mg g–1, at 318 K. The thermodynamic parameters confirm the endothermic and spontaneous nature of the adsorption process with increased randomness. The desorption study predicts the excellent regenerative power of KTC.