Ag_2CO_3的制备、表征及其光催化性能

Synthesis,Characterization and Light-responsive Reactivity of Ag_2CO_3 Photocatalyst

以AgNO_3和Na_2CO_3为原料通过沉淀法制备了Ag_2CO_3光催化剂,采用X-射线衍射(XRD)、扫描电镜(SEM)、傅里叶变换红外光谱(FTIR)和紫外可见光谱(UV-Vis)对所制备的样品进行了表征,并考察了该光催化剂在紫外光照射下对亚甲基蓝(MB)的催化降解效果。结果表明,Ag_2CO_3的禁带宽度约为2.53eV,经60 min紫外光催化反应,0.5g·L^(-1) Ag_2CO_3对40mg·L^(-1)的MB溶液的降解率达到97.7%,比同等条件下TiO_2的降解率高出31.1%。

Ag2CO3 was prepared by a simple precipitation reaction between Na2CO3 and AgNO3. X-ray powder diffraction, scanning electron microscopy, Fourier transform infrared spectrometer and UV-vis diffuse reflectance spectrometer were employed to investigate the phase structure, micro morphology and absorbance of the as-~：prepared sample. The photocatalytic activity of Ag2CO3 was evaluated by means of the degradation of methylene blue aqueous solution under UV light irradiation. The results showed that the band gap of AgzCO3 was about 2. 53 eV, and after 60 rain UV photocatalytic reaction, the degradation rate of MB solution with initial concentration of 40 mg L-1 reached 97. 7% by using 0. 5 g L-1 Ag2CO3, which was better than that of TiO2 31.1 at the same experimental conditions.