The ]Sodium Carboxymethyl Cellulose-grafting-Poly(Acryl Amide-Acrylic Acid) [ hydrogel was synthesized through free radical polymerization method of CMC, AAm, and AAc. Potassium persulfate(KPS) and N, N methylene bis-acrylamide (MBA) were used as initiator and crosslinking agent, respectively. FTIR, XRD, FESEM, and TGA were used to characterize the synthesized hydrogel. The hydrogel was used to remove metformin hydrochloride drug from aqueous solutions. The analysis clarifies the effect of several parameters on the quantity of adsorbate, including pH at a range of (1.2-12), the temperature at a range of (15, 20, 25 and 30°C), equilibrium time (1-240 min), and adsorbate weight at a range of (0.001-0.1 g). It is discovered that as temperature increases and pH decreases, the quantity of adsorbate present decreases. Equilibrium time 120 min. The adsorption isotherm seems to indicate that the adsorption mechanism followed Freundlich and Temkin models. Thermodynamic functions were measured, and it was discovered that the adsorption mechanism is exothermic and spontaneous.
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.
Poly (acrylamide-maleic acid) hydrogel synthesized via free radical polymerization of acrylic acid and maleic acid as monomers, using N,N-methylene bis acryl amide as cross-linker and potassium persulfate as initiator. The synthesized hydrogel was described by Fourier transform infrared spectroscopy (FTIR), field emission scanning electron microscopy (FE-SEM), Thermogravimetric analysis (TGA) and UV-visible spectroscopy. The synthesis hydrogel was used as adsorbents for removal of a cationic dye, malachite green (MG) from aqueous solution. The synthesized adsorbents showed high efficiency in removal of malachite green and a very high adsorption capacity. The results showed the adsorption equilibrium time was reached in 60 min and the adsorption method is found the direct pseudo second order kinetics.
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