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Impervious materials like Methylene blue(MB)are resistant to biodegradation.In the present study the photocatalytic degradation of Methylene Blue was performed in the aqueous suspension of La0.2PbFe12O19 under visible light illumination.La0.2Pb0.7Fe12O19 is a derivative compound of PbFe12O19 by substituting 30%atomic Pb with 20%La atoms so as to keep charge balance.