Fig. 2. (a) Low-magnification and (b) high-magnification HRTEM images of BA-2.Figure optionsDownload full-size imageDownload as PowerPoint slide
The XRD patterns of Ag2O, Bi2O3 and BA-2 are shown in Fig. 3. Ag2O exhibits several diffraction peaks at 32.8°, 38.3°, 54.9°, and 65.4°, indexed to (1 1 1), (2 0 0), (2 2 0) and (3 1 1) crystal planes of cubic Ag2O (JCPDS 41-1104). The diffraction pattern of Bi2O3 shows that A 484954 all the peaks can be indexed to the monoclinic α-Bi2O3 phase (JCPDS 41-1449). Compared with pure Bi2O3, the new peak corresponding to the cubic phase of Ag2O appears in XRD pattern of BA-2, which further confirms the existence of Ag2O in the composite. No other impurity peaks for BA-2 were observed, indicating the high purity of the products.
Fig. 3. XRD patterns of Ag2O, Bi2O3 and BA-2.Figure optionsDownload full-size imageDownload as PowerPoint slide
The UV–vis diffuse absorption spectra of Bi2O3, BA-1, BA-2 and BA-3 were measured using a UV–vis spectrophotometer with an integrating sphere, as shown in Fig. 4. The BA hybrid photocatalysts exhibit higher absorbance in the visible light region, and the intensity increases with the increase in Ag2O content, which is similar to those reported in the literatures ,  and . The enhanced absorbance of the BA hybrid photocatalysts is beneficial to their photocatalytic activity.