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Laminar nanocomposite of LaNb2O7/MnTMPyP [5,10,15,20-tetrakis(N-methylpyridinium-4-yl)porphyrinato manganese(Ⅲ)] was fabricated via electrostatic interaction between the colloidal dispersion of LaNb2O7-nanosheets and manganese porphyrin aqueous solution.