Many elements have been used to dope titanium dioxide (TiO 2 ) so that it absorbs light in the visible region of the solar spectrum. We have synthesized, for the first time, (S,N)‐codoped rutile‐TiO 2 photocatalyst using a hydrothermal method and subsequent nitridation under NH 3 flow. The (S,N)‐codoping causes the absorption edge of TiO 2 to be shifted to the longer‐wavelength region and two optical absorption bandgaps in the visible‐light region. (S,N)‐codoping has a better photocatalytic activity than S‐doping and N‐doping for degradation of methylene blue solution under visible light.
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Liu et al. (2004) studied this question.
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