Adsorption of methyl violet dye from wastewater using poly(methacrylic acid-co-acrylamide)/bentonite nanocomposite hydrogels

In this study, nanocomposite hydrogels of poly(methacrylic acid-co-acrylamide) (Poly(MAA-co-AAm)) containing different weight percent bentonite clay nanoparticles (0, 5, 10, and 15 wt. %) were used to remove methyl violet (MV) dye. FTIR, SEM, TGA, XRD analyze the properties adsorbents. Results showed that successfully distributed in hydrogel system. Bentonite at 10 % gave maximum MV dye adsorption efficiency. The highest was obtained a pH an adsorbent dosage 1.5 g/L, temperature 25 °C, contact time 60 min, pollutant concentration mg/L. thermodynamics studies, negative values Gibbs free energy (?G°) indicating process spontaneous. addition, Poly(MAA-co-AAm) Poly(MAA-co-AAm)/bentonite enthalpy (?H°) –61.24 –36.14 kJ/mol witch shows is exothermic range 25–45 °C using both Langmuir isotherm model applied describing equilibrium behavior process. kinetic study pseudo-second-order more successful than pseudo-first-order Elovich models. Poly(methacrylic acid-co-acrylamide)/bentonite adsorbents ? parameter 0.4276 22.15 mg.(g.min)?1, respectively high capacity these