Fabrication of MnO2 Nanoparticles from Simple Pyrolytic Method for Degradation of Methylene Blue Under Visible Light Irradiation

α-MnO2 nanoparticle with semi-tubular morphology was prepared pyrolytically using [Mn(pyo)2(dca)2]n as a sole precursor at 700C in air for 2 h without applying any catalyst or template. This nanostructure systematically characterized physically by Fourier transform infrared (FT-IR) spectroscopy, X-ray diffraction spectroscopy (XRD), scanning electron microscopy (SEM) and thermal gravimetric analysis (TGA). The displayed high photocatalytic activity toward decolorization of methylene blue (MB) dye under visible light irradiation assistance H2O2. result obtained indicated that almost 84% colour removal occured within 2.40 h.