Electrochemical reduction method was used to synthesize gamma-alumina (γ-Al2O3) nanoparticles (NPs) by optimizing different parameters like electrolysis time, current density, concentration of stabilizer or electrolyte, separation between two electrode and solvent. The synthesized γ-Al2O3 NPs were characterized by analytical techniques like XRD, SEM and EDX. Moreover the γ-Al2O3 NPs were explored for photocatalytic degradation of cationic pollutant Rhodamine B (RhB) and anionic pollutant Congo red (CR) in aqueous solution under sunlight. The degradation was 55.06% and 63.9% for RhB and CR respectively. The rate constant for RhB and CR was found to be pseudo first-order with values 0.170 and 0.208 h-1 respectively.
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