2.3. Characterization
Powder XRD patterns were recorded with a PANalytical X' Pert Pro X-ray diffractometer using Cu Ka radiation and the working voltage is 40 kV. UV/Vis diffuse reflectance spectra were recorded on Cintra-10e spectrometer using BaSO4 ¬¬as reference sample. The absorption-spectrum of RhB was recorded on HITACHI U3010 UV/Vis spectrophotometer.
2.4. Photocatalytic experiments
Photodegradation of Rhodmine B dye: The catalyst (100 mg) was added to an aqueous solution of Rhodmine B (0.02mmol/L, 100 ml) in a 150 ml quartz reactor. The photocatalysis experiments were carried out under irradiation of a 375 W mercury lamp with a filter glass to remove UV. Before the light experiments, dark adsorption experiments were carried out for 90 min.
用Excel进行综采工作面供电系统设计3. Results and discussion
3.1. Structure property
The XRD patterns for γ-Bi2O3/Fe2O3(x) composites with mass ratios of 10/90, 20/80, 30/70, 40/60, 50/50, 60/40, and 80/20 are showed in Fig. 1. With the increase of Fe2O3 component in composites, the intensity of (310) peak at 27.45o gradually decreases, which is identified as the main peak of the remnant γ-Bi2O3¬ (JCPDS 45-1344), whereas that of the (104) peak at 33.28o originating from Fe2O3 phase increases (JCPDS 02-0919).
Fig. 2 shows the UV–vis diffuse reflectance spectra of γ-Bi2O3/Fe2O3(x). The absorbance of γ-Bi2O3/Fe2O3(x) composites in 450-600 nm increases with the increase of Fe2O3 phase. It means that the composites can absorb more visible light comparing with pure γ-Bi2O3. This results from incorporation of Fe2O3.
Fig. 1. X-ray diffraction patterns of γ-Bi2O3/Fe2O3(x) (x=0, 10%, 20%, 30%, 40%, 50%, 60%, 80%)
Fig. 2. Diffuse reflectance spectra of γ-Bi2O3/Fe2O3(x) (x=0, 10%, 20%, 30%, 40%, 50%, 60%, 80%)
Table 1. Determination of decolorization
Samples Decolorization Samples Decolorization
x=0 6.8% x=40% 5.1%
x=10% 6.2% x=50% 5.8%
x=20% 5.4% x=60% 6.2%
x=30% 4.7% x=80% 4.5%
To exclude the possible effect of adsorption on photocatalytic test, RhB solution with catalyst was stirred for 90 min in dark environment until it reached equilibrium of adsorption/desorption. The results shown in Table 1 indicate that different samples have similar adsorption capacity for RhB from 4.5 % to 6.8 %.
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Visible-light photocatalytic properties of γ-Bi2O3 composited with Fe2O3 第2页下载如图片无法显示或论文不完整，请联系qq752018766
