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Photo-thermo catalysis that combines photo- and thermo-catalysis has emerged as an attractive approach for effective and economical elimination of pollutants. Herein, we fabricated a robust, highly water stable 2D Co(II)-MOF photo-thermo catalyst towards the decomposition of permanganate anions. It has been demonstrated that Co(II)-MOF exhibits excellent catalytic capacity, good selectivity and incredible reusability for degrading MnO 4 - . The reaction rate of the process was investigated for thermo-photo vs. thermo/photo processes to provide conclusive evidence that Co(II)-MOF shows a strong synergistic use as both an energy source and Lewis acid.