Adsorption of mefenamic acid from water by bentonite poly urea formaldehyde composite adsorbent

Abstract EN

Poly urea formaldehyde –Bentonite (PUF-Bentonite) composite was tested as new adsorbent for removal of mefenamic acid (MA) from simulated wastewater in batch adsorption procedure.

Developed a method for preparing poly urea formaldehyde gel in basic media by using condensation polymerization.

Adsorption experiments were carried out as a function of water pH, temperature, contact time, adsorbent dose and initial MA concentration .Effect of sharing surface with other analgesic pharmaceuticals at different pH also studied.

The adsorption of MA was found to be strongly dependent to pH.

The Freundlich isotherm model showed a good fit to the equilibrium adsorption data.

From Dubinin–Radushkevich model the mean free energy (E) was calculated and the value of 5 KJ/mole indicated that the main mechanism governing the adsorption of MA on PUF-Bentonite composite was physical in nature.

The kinetics of adsorption tested for first order, pseudo second order models and Elovich’s equation, results showed the adsorption followed the pseudo-second-order model.