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以柠檬酸为辅助剂,在水热条件下酸化钼酸铵溶液合成MoO_3纳米球。采用X射线衍射、扫描和透射电子显微镜等手段对其进行表征。以有机染料亚甲基蓝(MB)为模拟污染物对MoO_3纳米球的光催化性能进行了测定,考察了不同p H值前驱液、水热温度、反应时间、光催化剂和辅助剂用量对MoO_3光催化效果的影响。研究结果表明,前驱液pH值对MoO_3纳米球光催化降解亚甲基蓝的影响较显著。在一定的水热条件下,改变溶液的p H值,可实现MoO_3纳米粒子的形貌从棒状转化为球形。当pH=1时,合成的球形氧化钼纳米晶尺寸为20~30 nm,且形貌均匀,分散良好,光照3 h后对染料亚甲基蓝表现出较高的催化活性,降解率可达94%以上,因此,试验制得的球形MoO_3纳米粒子对染料具有较好的降解性能。
Using citric acid as assistant, acidifying ammonium molybdate solution under hydrothermal conditions to synthesize MoO_3 nanospheres. X-ray diffraction, scanning and transmission electron microscopy and other means to characterize it. The photocatalytic activity of MoO_3 nanospheres with methylene blue (MB) as a contaminant was measured. The photocatalytic activity of MoO_3 at different p H values, hydrothermal temperature, reaction time, amount of photocatalyst and auxiliary agent were investigated. Impact. The results show that the pH value of the precursor solution has a significant effect on the photocatalytic degradation of methylene blue by MoO 3 nanospheres. Under certain hydrothermal conditions, changing the p H value of the solution can transform the morphology of the MoO 3 nanoparticles from a rod shape to a spherical shape. When pH = 1, the synthesized spherical molybdenum oxide nanocrystals have a size of 20-30 nm and a uniform morphology with good dispersity. After 3 hours of irradiation, the dye methylene blue shows high catalytic activity with a degradation rate of over 94% Therefore, the spherical MoO 3 nanoparticles produced by the experiment showed good degradation properties for the dye.