Green-synthesized mesoporous-structures have widespread attention due to its environmentally-benign nature and numerous applications. Herein, we report the green synthesis of mesoporous iron oxide network using green tea extract. The morphological and phase analyses were evaluated and elucidated the formation of mesoporous-structure showing predominantly hematite-phase. Catalytic role of α-Fe2O3 was investigated in Fenton reaction for the removal of methylene blue dye to understand its significance in wastewater treatment.