In this study, (sodium alginate/acrylamide) interpenetrating polymer networks ((NaAlg/AAm)IPN) have been prepared at definite composition. The aqueous solution of 3% (w/v) sodium alginate and 50% (w/v) acrylamide was irradiated with 60 Co-g rays at a dose rate of 0.07 kGy/h up to 5 kGy. The percent conversion was determined gravimetrically and 100% gelation was achieved at 5 kGy dose. To understand whether the semiinterpenetrating polymer network of sodium alginate is performed, Fourier Transform Infrared (FTIR) spectra of polyacrylamide (PAAm), sodium alginate, and the semiinterpenetrating polymer network were recorded. It is found that the FTIR spectra of PAAm, NaAlg, and the semi-interpenetrating polymer network are different. The thermograms of PAAm, sodium alginate, and the semiinterpenetrating polymer network were recorded for investigating their thermal character. (NaAlg/AAm)IPN hydrogels were immersed to swell in a solution of pH 7, at a temperature of 258C. The swelling results at pH 7.0 indicated that (NaAlg/AAm)IPN hydrogel, containing 3% NaAlg showed maximum % swelling in water but swelling increased in the order of water > Magenta > Methylene Blue > Safranine-O > Methyl Violet. Diffusion of water and aqueous solution of dyes within (NaAlg/AAm)IPN hydrogels was found to be of Fickian character at the initial stage of swelling with regard to values calculated for diffusion coefficient of (NaAlg/AAm)IPN hydrogels in water and aqueous solution of dyes. Some diffusion parameters were calculated from swelling of (NaAlg/AAm)IPN in water and dyes and their adsorption isotherms were plotted. In the adsorption experiments, the efficiency of (NaAlg/AAm)IPN hydrogels to adsorb Magenta, Safranine-O, Methylene Blue, and Methyl Violet dyes from water was studied. (NaAlg/AAm)IPN hydrogels showed different adsorption for different aqueous solution of dyes at pH 7.0. Adsorption isotherms were constructed for (NaAlg/AAm)IPN-dye systems. S type adsorption in the Giles classification system was found. Thermal and spectroscopic characterization of semi-interpenetrating polymer network of sodium alginate and acrylamide and dye adsorbed semi-interpenetrating polymer network of sodium alginate and acrylamide was recorded.
The 4-amino-2-hydroxyacetophenone was immobilized onto silica gel modified with\ud
3-aminopropyltrimethoxy silane. The carried reaction is classic condensation reaction. The\ud
obtained structure was characterized by infrared spectroscopy and thermo gravimetric analysis.\ud
The values of adsorption of Cu(II), Ni(II), and Co(II) ions were detected with an atomic\ud
absorption spectrometer. The experiment conditions for effective sorption of the studied\ud
metal ions were performed by using batch method. The maximum adsorption capacities\ud
and isotherm parameters were calculated with using the Langmuir, Freundlich, and\ud
Dubinin-Radushkevich isotherm equations. Thermodynamic parameters such as free energy\ud
(ΔG°), entropy (ΔS°), and enthalpy (ΔH°) were also calculated from the experimental results.\ud
The sorption results were used to explain the mechanism of the sorption. The modified\ud
structure was successfully used in the separation of Cu(II), Ni(II), and Co(II) from the\ud
aqueous solutions
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