Microstructure and properties of Fe2(MoO4)3 prepared by sintering recovery products from waste MoSi2

Abstract

MoO3 was recovered from waste MoSi2 after oxidation roasting by thermal evaporation method, and Fe2(MoO4)3 was prepared by reaction sintering method using the recovered MoO3 and Fe2O3 as raw materials. The time and temperature for the complete oxidation of MoSi2 were discussed, and the microstructure, linear shrinkage, volume density, spectral properties of the prepared Fe2(MoO4)3 materials were studied. The results show that, the waste MoSi2 powders can be completely oxidized after calcination at 500 ℃ for more than 120 min. During the reaction sintering process of MoO3 and Fe2O3, the higher the sintering temperature, the more complete the reaction between MoO3 and Fe2O3; the void of the prepared Fe2(MoO4)3 materials increases, the line shrinkage rate increases, and the volume density decreases. Fluorescence spectrum analysis shows that, the photogenerated electron-hole pairs of the Fe2(MoO4)3 and MoO3 composite materials are more difficult to be recombined than those of the pure Fe2(MoO4)3, showing the higher photocatalytic activity for the composites. Using methylene blue as dye, the pure Fe2(MoO4)3 has the good adsorption performance, while the Fe2(MoO4)3 and MoO3 composites show the excellent photocatalytic performance, and the mixture of Fe2(MoO4)3 and MoO3 composites has the best photocatalytic degradation cycle stability.

Keywords

• waste mosi2 recycling
• thermal evaporation
• reactive sintering
• microstructure
• photocatalytic degradation