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These samples of UV - visible absorption spectra follow the Figure 4. Samples have strong UV absorption capacity, in the visible wavelength greater than 410nm, the absorption is relatively weak, its absorption edge at around 410nm. Compared with pure TiO2 ,sample Cd-TiO2, N-TiO2, and N, Cd-TiO2 light absorption increased, and caused a certain degree of red shift. N, Cd-TiO2  absorption is the strongest, the optical response range of the visible area has been expanded. The absorption edge wavelength of the samples and the band gap shown in Table 2. As can be seen from Table 2, with the band gap of pure TiO2 compared to doped-TiO2 band gap were narrowed, increasing its absorption of visible light, which is enhanced catalytic effect of visible light, causes. Where N, Cd-TiO2 band gap of the smallest, the strongest of its optical absorption.
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