Abstract
A brand-new vanadium pentoxide (V2O5) functionalized starch (St) grafted poly(acrylonitrile) (PAN) adsorbent was synthesized via microwave-assisted graft polymerization method to remove methylene blue dye from water. FTIR, TEM, SEM, and XRD analysis were used to characterize the materials. Experiments on batch adsorption were conducted on the V2O5 and V2O5-St-g-PAN composite. The most significant removal efficiency of methylene blue (MB) by V2O5-St-g-PAN in water was 90% at a pH of 9 with an optimum adsorbent dose of 0.2 g in a 50 mL of 50 mg/mL MB concentration. The adsorption mechanism followed the Langmuir isotherm model with a correlation coefficient (R2) of 0.9996. The adsorption of MB onto V2O5-St-g-PAN was thermodynamically favorable at all temperatures (ΔGo = −56.371 KJ/mol to −56.164 KJ/mol). A negative enthalpy change (ΔHo) of −60.482 KJ/mol and a positive entropy change (ΔSo) of +0.0138 KJ/mol indicates an exothermic and highly ordered adsorption process.
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