الفهرس | Only 14 pages are availabe for public view |
Abstract Water sanctity throughout history where the creation of every living thing was obtained, but with the progress of civilization of mankind water pollution has become one of the negatives of this progress. So scientists have been working to find out solutions for water purification. The heavy metals are the most dangerous pollutants facing organisms because of their toxicity. Various technologies have been developed to be available for removal of toxic materials from waste water, thereby preventing the pollution of surface and ground water. The current study take care of a solution to the problem o f environmental pollution and re-plastic waste recycling for water pollution treatment. Hence a new easily prepared, low-cost and efficient chelating polymers CPs based on waste polystyrene plastics (PSt) and polymethylamethacrylate PMMA functionalized by itaconic acid (IA) and 2-hydroxyethyl methacrylate (HEMA) moieties in absence and presence of montmorillonite clay MMT have been used as potential adsorbents for removal of toxic heavy metal pollutants from water system. The adsorption of Cu 2+ ions were found to be time dependent. Adsorption isotherms have been 145 studied in terms of Langmuir, Freundlish and Temkin isotherms models. The values of correlation coefficients deduced from the aforementioned three models confirmed that R1, R3, R4, R5, R6 and R7 are good fitted to Temkin adsorption model. In the other hand, R2 and R8 follows Langmuir adsorption. The data of the kinetics of Cu 2+ ions sorbet from aqueous solutions into the prepared resin at different times were analyzed using Lagergren`s pseudofirst and pseudo-second order, where the correlation coefficient values illustrated that the sorption of Cu +2 ions by R2, R4, R7 and R8 fit well the pseudo-first order model, where as the sorption of Cu +2 ions by R1, R3, R5, and R6 fit well the pseudo-second order model. The selectivity measurements for different toxic heavy metal ions (Cu, Pb, Cr, Co, Ni and Cd) have been investigated and it was found from the adsorption test the adsorbents being evaluated had the highest adsorption capacities for Cu 2+ ions with most synthesized CPs where; the sorption capacities of the tested metal ions on the surface of CPs in the following order for R1 (Cu ˃Pb ˃Cr ˃ Co ˃ Cd ˃ Ni), for R2 in the order (Cu ˃ Cr ˃ Cd ˃ Pb ˃ Co ˃ Ni), for R3 in the order (Cd ˃Cr ˃ Cu ˃ Co ˃ Pb ˃ Ni), for R4 in the order (Cu ˃ Cd ˃ Co ˃ Cr ˃ Ni ˃ Pb), for R5 in the order (Cd ˃ Cr ˃ Cu ˃ Pb ˃ Ni ˃ Co), for R6 in the order (Cu ˃ Pb ˃ Cr ˃ Co ˃ Ni ˃ Cd), for R7 in the order (Pb˃ Co ˃Cr ˃Ni ˃Cd ˃Cu) and for R8 in the order (Cd ˃ Ni ˃ Pb ˃ Cr ˃ Cu ˃ Co). The metal ions uptake increases with increasing pH values due to complete ionization of the COOH groups occurred at higher pH values. Finally, we can conclude that these commercial, easily prepared CPs have double positive features in which it helps to get rid of the organic plastic wastes as well as toxic heavy metal pollutants. |