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In this study, the influence of manganese substitution on the photocatalytic activity of heterogeneous Fe3-xMnxO4 catalyst were investigated. The Fe3-xMnxO4 catalysts were synthesized through co-precipitation method at varies manganese (Mn) substitution ratio (x) of 0, 0.1, 0.2, 0.3, 0.4 and 0.5, respectively. The photocatalytic performance of the resultant catalysts were tested in photo Fenton-like degradation of AOII dye in the presence of 22Mm H2O2 at initial pH of 3. Interestingly, discoloration of 95.9% AOII was achieved at optimized x value of 0.3. Enhancement of nearly 98% was observed compared to pristine catalyst (x=0) which was able to degrade up to 48.4% only. In addition, it also demonstrated that the AOII degradation kinetic using Fe3-xMnxO4 catalyst at x=0.3 by photo Fenton-like reaction was fitted well with the first order reaction kinetic (k = 0.018 min-1 and R2 = 0.9862). Thus, it can be suggested that the substitution of Mn into the matrix of iron oxide provides a positive influence in enhancing the overall photocatalytic peformance of heterogeneous Fe3-xMnxO4 catalyst during the photo Fenton-like reaction.