A network of fibers comprising orthorhombic molybdenum trioxide (α-MoO3) crystals were synthesized using paper as template via a biomorphic approach. The template was completely removed by annealing the sample at 600°C for 5 min. Monoclinic MoO3 was formed and consequently converted into orthorhombic α-MoO3 after prolonged annealing. Three milligrams of the biomorphic α-MoO3 could degrade up to 90% of a methyl violet aqueous solution with a concentration of 20 mg/L under normal visible light. The size of the α-MoO3 grains and the porosity of the biomorphic sample affected catalytic performance.
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