中文摘要：

以NH4VO3和AgNO3为原料,采用液相直接沉淀法制备了Ag3VO4粉体,用XRD、SEM、BET和UV-Vis等手段对样品的物相、形貌、比表面积和光学特性进行了表征;以可见光为光源、罗丹明B为目标降解物考察了Ag3VO4的光催化活性。结果表明,反应混合物的pH值对样品的成分有重要的影响,在调节反应混合物的pH值为7时,所制备的样品为单斜相的Ag3VO4;反应时间、反应温度和表面活性剂等对Ag3VO4的尺寸和形貌有较大的影响。UV-Vis分析表明,所得样品在400～680nm有强而宽的吸收,其能带间隙Eg为1.90eV;光催化性能测试表明,样品的可见光光催化活性较高,在35W氙灯照射下,经100min降解,80℃反应8h所得样品对罗丹明B的降解率可达97.7%。

英文摘要：

Using NH4VO3 and AgNO3 as starting materials, Ag3VO4 powders were synthesized by liquid-phase direct precipitation method. The phases, morphologies, specific surface area and optical properties of the sam- ples were characterized by means of XRD, SEM, BET and UV-Vis techniques. The visible light was used as light source to investigate the photoeatalytic activity of Ag3VO4 for the degradation of rhodamine B solution. The results show that the as-prepared samples were monoclinic phase Ag3VO4 when pH values of the reaction mixtures are adjusted to 7. It was also demonstrated that the compositions of the samples are importantly influ- enced by pH value of the reaction mixture, and the particle size and morphology of the silver vanadate were largely influenced by reaction time, reaction temperature and different surfactants. UV-Vis result indicates that Aga VO4 has a strong and wide absorption at the wavelength region of 450-800nm, and its energy band gap was 1.90eV. The photoeatalytie degradation results indicate that as-prepared samples have a high visible-light pho- toeatalytic activity. The sample obtained at 80℃ for 8h could decolorize rhodamine B solution well, and the degradation rate of rhodamine B was up to 97.7% after illuminating for 100min under 35W xenon lamp.