Abstract
Composites of the nano-sized perovskite-type oxide of LaMnO3 and multi-walled carbon nanotubes (MWCNTs) were synthesized in a single step using the sol-gel method. Their photocatalytic activities for the degradation of various water-soluble dyes under visible light were evaluated. The prepared samples were characterized by thermogravimetry analysis, scanning electron microscopy transmission electron microscopy, X-ray diffraction, photoluminescence spectroscopy and UV-vis diffused spectroscopy. Results showed that LaMnO3 nanoparticles grew on the surface of MWCNTs with a grain size of around 20 nm. Photocatalysis measurements revealed that the LaMnO3/MWCNT nanocomposites had greater photocatalytic activities than pure LaMnO3 nanoparticles, and the mass percentage of MWCNTs showed that 9.4% possessed the highest photocatalytic activity. These results indicate that LaMnO3/MWCNT nanocomposites are promising candidates as highly effective photocatalysts.
Highlights
Carbon nanotubes (CNTs), one of the most important materials in the 21st century technology, are regarded as representatives for nanotechnology
As an important perovskite-type structure photocatalyst, LaMnO3 has been applied for the photocatalytic production of hydrogen from water and degradation of organic pollutants under UV-Vis light irradiation
The photocatalytic activities of the as-prepared LaMnO3/ multi-walled carbon nanotubes (MWCNTs) nanocomposites were investigated by the degradation of acid red (AR), methyl orange (MO), weakacid yellow (WAY), direct green (DG) and methylthionine blue (MB) under the radiation of a 300 W xenon lamp
Summary
Carbon nanotubes (CNTs), one of the most important materials in the 21st century technology, are regarded as representatives for nanotechnology. A large number of studies have shown that photocatalytic oxidation plays an important role on the removal of dyes from waste water, which contains direct dyes, sulphur dyes, reactive dyes, acid dyes and other compo‐ nents. Among these oxides, as some of the promising photocatalysts, perovskite-type oxides have been widely researched because of their low cost, simple preparation, high photochemical stability and friendliness towards the environment. As an important perovskite-type structure photocatalyst, LaMnO3 has been applied for the photocatalytic production of hydrogen from water and degradation of organic pollutants under UV-Vis light irradiation. More‐ over, this implicated that MWCNTs in the composite could help concentrate organic dyes on the composite surface, enhancing the photocatalytic degradation rate
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