Synthesis, Identification and Application of Polyacrylamide Polystyrene/Bentonite Nanocomposite for Adsorbing of Lead and Cadmium from Contaminated Water

During last decade, the construction and application of various adsorbents of heavy metals have been interested by many researchers. Nanocomposites with high surface areaandporosity can remove large amount of these contaminants from aques media. In this research, nanocomposites of polyacrylamide-polystyrene/bentonite synthesized,and identified. The effective parameters effective on adsorption Cd+2,Pb+2 cations including pH, Bentonite / Polyacrylamide ratio, adsorption rate, time contact, cationic and cationic activity of adsorption activity were illustrated. The structure of nanocomposites was carried out by TEM, BET, FT-IR and XRD methods. The rates of lead and cadmium adsorption were measured by atomic absorption. The results of microstructural investigations showed that in polyacrylamide-polystyrene/bentonite nanocomposite the interlayer distance in crystal structure and specific surface increased significantly in comparison with the modified bentonite. Also, the results approved that the highest adsorption at pH = 6, the best ratio of bentonite to polyacramide 2. 5: 5, the optimum absorbance was 5 g / l, the duration of the call was 12 hours, and the highest metal adsorption at 150 mg /l concentration.