K3V5O14的合成及光催化性能和吸附性能

Synthesis, Photocatalytic Activity and Adsorption Performance of K3V5O14

采用固相合成法制备出K3V5O14,利用X射线粉末衍射(XRD)、扫描电镜(SEM)和透射电镜(TEM)表征了其结构和形貌。研究了反应温度和反应时间对K3V5O14的结构、形貌和紫外可见吸收光谱的影响。探讨了材料的光催化性能和吸附性能,结果表明:在光催化性能测试中,具有层状结构的K3V5O14对亚甲基蓝(MB)的光降解作用较弱,75min内降解率低于10%;但K3V5O14对亚甲基蓝染料表现出较高的选择性及吸附性能,其最佳投入量为0.5g·L^-1,在45min时对亚甲基蓝的吸附率可达84.46%;吸附动力学拟合结果显示,K3V5O14对亚甲基蓝的吸附过程满足准二级吸附动力学,最大吸附容量为75.19mg·g^-1。

K3V5O14 was prepared via solid phase method and characterized by powder X-ray diffraction (PXRD), scanning electron microscope (SEM) and transmission electron microscope (TEM). The influences of reaction temperatures and times for the structure, morphology and UV-Vis diffuse reflectance spectroscope of K3V5O14 were studied. The photocatalytic activity and adsorption performance were tested in details. The results show the photocatalytic activity of K3V5O14 with layer structure is weak by the degradation of methylene blue (MB) under visible light and the degradation rate is lower than 10% in 75 min. However, the adsorption performance is higher and MB is selected and adsorbed from cationic dyes including MB, methyl orange and Rhodamine B. The adsorption rate is 84.46% at 45 min when the optimal dosage of adsorbent is 0.5 g·L^-1 . The adsorption kinetics follows the pseudo-second-order kinetic models and the maximum adsorption capacity is 75.19 mg·g^-1 .