常压水热法合成玉米棒状In2O3及其性能研究

摘要

The In2O3 precursor, indium hydroxide, was prepared by reaction at 95 ℃ for 22 h under atmospheric pressure via hydrothermal method, with In(NO3)3·4.5H2O and (NH2)2CO as the raw materials.The In2O3 powder was synthesized by calcining of indium hydroxide at 600 ℃ for 2 h.The structure, morphology and properties of the In2O3 powders were characterized by ultraviolet-visible spectrophotometry(UV-Vis), X-ray diffraction(XRD), raman spectrometer and scanning electron microscope(SEM).The photocatalytic activity of the In2O3 powders for degradation of methyl orange was studied.The results showed that the In2O3 powder is a mixture of body-centered cubic bixbyite-type crystal and metastable corundum-type hexagonal structure, and the blue shift of the In2O3 is apparent in the UV-Vis spectrum.As the amount proportion of In(NO3)3·4.5H2O and (NH2)2CO was 1 ∶7, the rod-shaped structure was appeared in the In2O3 powder, the rod body length and diameter were about 500 nm and 150 nm, respectively.The rod like structure of In2O3 exhibited good photocatalytic activity, and the degradation rate of methyl orange was 69.7% after 6.5 h of UV light irradiation.%以In(NO3)3·4.5H2O和(NH2)2CO为原料,采用常压水热法于95 ℃反应22 h制得氧化铟(In2O3)前驱物氢氧化铟,于600 ℃煅烧2 h合成了In2O3粉体,其结构、形貌及性能经紫外-可见(UV-Vis)光谱、X-射线衍射(XRD)、拉曼光谱和扫描电镜(SEM)表征.以甲基橙为目标降解物,研究了In2O3粉体的光催化活性.结果表明:In2O3粉体为体心立方晶系方铁锰矿结构和亚稳相刚玉六方结构的混合体,In2O3的UV-Vis谱图中出现了明显的蓝移.当In(NO3)3·4.5H2O和(NH2)2CO物质的量比为1 ∶7时,In2O3粉体中出现了玉米棒状结构,棒状体长度约为500 nm,直径约150 nm;该棒状结构的In2O3对甲基橙有较好的光催化活性,在紫外光照射6.5 h后甲基橙的降解率为69.7%.