Template Synthesis Of Mesoporous InVO₄ Nanomaterials And Application

As a new type of pollution processing technology, photocatalysis technology has become a research focus in recent years because of its advantages including low cost, wide application, complete degradation of organic pollutants and direct use of solar energy. As a new type of optical catalyst with a low band gap, InVO₄ can make full use of the visible light energy in the solar energy and has an excellent responsiveness to visible light. The template method was used to synthesize different morphologies of InVO₄ crystal. Meanwhile, X-ray diffraction（XRD）, thermogravimetric analysis（TGA-DSC）, scanning electron microscopy（SEM）, transmission electron microscopy（TEM）, nitrogen adsorption-desorption（BET） and other analytical techniques were used to characterize the products. And the performance of the products in degradation of rhodamine B（RHB） under the visible light has been observed. The research findings are as follows:The hydrothermal method was used to synthesize nano-indium vanadate particles, with P123 as the soft template, In（NO₃）₃?4.5·H₂O and NH4VO₃ as the metal source, ethanol and water as the solution. The effects of different hydrothermal temperatures and time on the morphology of crystals were observed. The results showed that through the control of hydrothermal temperature and time, different morphologies of crystals could be obtained. Mesoporous InVO₄ with a cubic structure could be produced under the solvent thermal temperature of 150 ℃ for 24 h. The bore diameter was 19.3 nm, specific surface area was 29.1 m²/g and the degradation rate of RhB under the light of 500 w Xenon lamp with H₂O₂ for 120 min was 42.7 %.With MCM-48 as the hard template, In（NO₃）₃?4.5·H₂O and NH4VO₃ as the metal source, the hydrothermal method was used to synthesize nano-indium vanadate particles. The effects of different hydrothermal temperature and time on the morphology of crystals were observed. The results showed that different morphologies of InVO₄ crystals could be obtained under different hydrothermal temperatures. Mesoporous InVO₄ with a hollow cubic structure could be prepared under the hydrothermal temperaturete of 150 ℃ for 24 h and roasting temperature of 550 ℃（speed rate of 1 ℃/m in）. T he specific surface area w as 55.36 m²/g, The bore diameter was 30-45 nm, the large bore diameter was 100-180 nm and the degradation rate of RhB under the light of 500 w Xenon lamp with H₂O₂ for 120 min was 66.8 %.