科研之友
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摘要
Branched MnOOH nanorods with diameters in the range of 50150 nm and lengths of up to tens of micrometers were prepared by using potassium permanganate (KMnO4) and PEG 400 (PEG=polyethylene glycol) as starting materials through a simple hydrothermal process at 160 degrees C. After annealing at 300 degrees C under a N2 atmosphere for 5 h, MnOOH nanorods became gradually dehydrated and transformed into mesoporous Mn3O4 nanorods with a slight size-shrinking. The as-obtained mesoporous Mn3O4 nanorods had an average surface area of 32.88 m2?g-1 and a mean pore size of 3.7 nm. Through tuning the experimental parameters, such as the annealing atmosphere and temperature, beta-MnO2, Mn2O3, Mn3O4, MnO, and Mn5O8 were selectively produced. Among these structures, mesoporous Mn3O4 nanorods were efficient for the catalytic degradation of methylene blue (MB) in the presence of H2O2 at 80 degrees C.
