An efficient calix[4]arene based silica sorbent for the removal of endosulfan from water

▶ Sorption efficiency of calix[4]arene based silica resin was investigated to remove α and β endosulfan isomers from aqueous solution. ▶ The sorption parameters, i.e. pH, equilibrium time, shaking speed and sorbent dosage were optimized. ▶ Freundlich sorption isotherm was found to be best fitted to sorption data. ▶ Kinetics of sorption shows that it follows pseudo second order rate equation. ▶ Sorbent can be reused effectively for real waste water samples.