Graphene oxide / (polyvinylpyrrolidone / acrylic acid) composite GO/ (PVP-AAc) was studied as adsorbent for the Congo red dye. The synthesized composites hydrogels were characterized by Fourier transform infrared spectroscopy (FTIR). The process of adsorption of the Congo red (CR) dye on the surface of the GO/ (PVP-AAc) composite has reached equilibrium state within 60 minutes. The rate of adsorption of the dye on the surface was good due to the high surface area characteristic of the surface of the composite. The adsorption kinetics of the dye on the surface of the composite GO/ (PVP-AAc) were studied using of pseudo-first order model and pseudo-second order model. The results indicated that the adsorption process follows the pseudo-second order model. The effects of temperature, ionic strength and pH were also studied. In order to determine the maximum adsorption, the linear forms of isotherm of adsorption were studied, Langmuir, Freundlich, and Temkin equations. Also were studied the thermodynamic functions of the process of adsorption of, Gibbs free energy (ΔG), Entropy (ΔS), and Enthalpy (ΔH).

Increased contamination of pharmaceutical compounds and their presence have led to real health problems. In this study used Poly (Graphene oxide/polyvinylpyrrolidone/acrylic acid (GO/PVP/AAc) as the innovator composite/hydrogel, were tried out atenolol drug. It has been proven to be effective in laboratory elimination of solutions. The composite prepration via free radical polymerization by using Specific ratios between (PVP/AAc) hydrogel and graphene Oxide (GO). The innovator adsorbent was estimated characterized by FT.IR, and FE-SEM. A suite adsorption tests were studied using to performed the Optimal conditions Of which contact time, pH. Dosage of adsorbent, ionic strength, and temperature. The kinetic experimental data were carried out via two model first pseudo order and second pseudo order, the adsorption proocess followed Pseudo second -order kinetic model with correlation coefficients greater than 0.999. The adsorption isotherms of composite could be illustrated well by the Freundlich Langmuir and Timken equations, The process of Atenolol adsorption on composite was depended on Freundlich and Timken isotherms more than other. The study discusses the thermodynamic parameters including changes in enthalpy, entropy, and Gibbs free energy.