Poly urea formaldehyde –Bentonite (PUF-Bentonite) composite was tested as new adsorbentfor removal of mefenamic acid (MA) from simulated wastewater in batch adsorption procedure. Developed a method for preparing poly urea formaldehyde gel in basic media byusing condensation polymerization. Adsorption experiments were carried out as a function ofwater pH, temperature, contact time, adsorbent dose and initial MA concentration .Effect ofsharing surface with other analgesic pharmaceuticals at different pH also studied. Theadsorption of MA was found to be strongly dependent to pH. The Freundlich isotherm modelshowed a good fit to the equilibrium adsorption data. From Dubinin–Radushkevich model themean free energy (E) was calculated and the value of 5 KJ/mole indicated that the mainmechanism governing the adsorption of MA on PUF-Bentonite composite was physical innature. The kinetics of adsorption tested for first order, pseudo second order models andElovich’s equation, results showed the adsorption followed the pseudo-second-order model.
An increasing number of emerging contaminants have been detected in surface waters, sediment, soil and ground water in different locations in the world, which is a new environmental challenges need an actual concern for international scientific and legislative communities. The nonprescription and huge used pharmaceuticals ibuprofen and diclofenac sodium will be focused in this study. New adsorbent developed using cheap inorganic clay material (bentonite) and organic polymer polyureaformaldehyde (PUF), the combination of these two materials gave the surface more roughness with wide active site distribution. Batch adsorption experiment performed to each pharmaceutical individually to determine the optimum separation parameters and understanding the adsorption process pathway. Both pharmaceuticals adsorbed on bentonite –PUF adsorbent in short time ranges from 15 min for ibuprofen to 30 min for diclofenac sodium .Thermodynamic analysis indicates the adsorption process is endothermic in nature and fall in the region of physical adsorption for tested pharmaceuticals (ΔH˚=23.33 and 14.69 KJ/Mol for both ibuprofen and diclofenac sodium respectively).Elovichs equation for describing kinetics of adsorption seemed a good fit with adsorption of both pharmaceuticals .The effect of pH had a significant effect for both pharmaceuticals with high removal (99.8% for diclofenac and 99.2 % for ibuprofen) at acidic pH=2 below Pka value. Isotherm studied at different initial concentration, the results showed that the Dubinin-Radushkevich model suitable for describing ibuprofen adsorption, and Freundlich's isotherm for diclofenac sodium.
Copolymers between polylactic acid and polyethylene glycol, also alganic acid and polyethylene glycol were synthesized and disocynate (MDI) were prepared and characterized. Swelling behaviors and loss of weight of these polyurethanes were studied by immersion of the gels in various buffer solutions. Particularly the polyurethane foam showed the highest EWC (equilibrium water constant) in timedependent and pH-dependent swelling.
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