REMOVAL OF CONGO RED AND METHYLENE BLUE DYES IN AQUEOUES SOLUTION USING COPPER (II) OXIDE NANOPARTICLES
The removal of Congo Red (CR) and Methylene Blue (MB) in aqueous solution using copper (II) oxide nanoparticles as the adsorbent has been studied. Copper (II) Oxide nanoparticles were synthesized by simple aqueous precipitation method and the surface area and bulk density were determined. Batch adsorption kinetic studies were carried out with varied initial dye concentration and varied adsorbent dosage. Non-linear regression method was used to fit experimental data to Pseudo-first order, Intra particle diffusion and Pseudo-second order kinetic models. The results obtained for varied adsorbent doses showed that when the three kinetics models studied were compared, the pseudo-second order kinetic model with R2 values of 0.9999, 0.9981, 0.9798, 0.9378, 0.9858 and R2 values of 0.9922, 0.9994, 0.9807, 0.9755 and 0.9960 for Congo red and Methylene blue respectively showed best fit for the sorption process. The results obtained for varied initial dye concentration showed that when the three kinetic models were compared, the intra particle diffusion model with R2 values of 0.9966, 0.9959, 0.9998, 0.9999, and 0.9997 for the sorption of Congo red and R2 values of 0.9815, 1.0000, 0.9999, 0.9988 and 0.9999 for Methylene blue, showed best fit. These results obtained showed that Copper (II) Oxide nanoparticles could be used as an adsorbent for the removal of Congo red and Methylene blue from aqueous solution.