Abstract
Mn-C-codoped TiO2 catalysts were synthesized by modified sol-gel method based on the self-assembly technique using polyoxyethylenesorbitan monooleate (Tween 80) as template and carbon precursor and the effect of calcination temperature on their structural properties and photocatalytic activity were investigated. The XRD results showed undoped and Mn-C-codoped TiO2 calcined at 400 oC only include anatase phase and the rutile phase appears when the calcination temperature reached to 600 oC. UV-vis absorption spectroscopy demonstrates that the absorption spectra are strongly modified by the calcination temperature. Moreover, the Mn-C-TiO2 calcined at 400 oC showed the lowest PL intensity due to a decrease in the recombination rate of photogenerated electrons and holes under light irradiation. The photocatlytic activity of Mn-C-codoped TiO2 were evaluated by the degradation of methyl orange (MO) under the simulate daylight irradiation and all the prepared Mn-C-codoped TiO2 samples exhibited high photocatalytic activities for photocatalytic decolorization of methyl orange aqueous solution. At 400 oC, the Mn-C-codoped TiO2 samples showed the highest photocatalytic activity due to synergetic effects of good crystallize ation, appropriate phase composition and slower recombination rate of photogenerated charge carriers, which further confirms the calcination temperature could affect the properties of Mn-C-codoped TiO2 significantly.
Highlights
Photocatalytic degradation of toxic organic compounds has received a great attention for the past several years
We have reported that the use of hydrocarbon surfactants as the template and nonmetal doping precursor in the self-assembly sol–gel methods to tailor-design the structural properties of TiO2 from molecular
The Mn-C-TiO2 sample calcined at 400 oC shows the anatase phase and the rutile phase appears when the calcination temperature reach to 600 oC
Summary
Photocatalytic degradation of toxic organic compounds has received a great attention for the past several years. Several strategies have been developed to shift the optical sensitivity of TiO2 from UV to the visible-light region for the efficient use of solar energy, such as element doping, metal deposition, surface sensitization, and coupling of composite semiconductors . 8-11 Recently, co-doped titania with double non-metal , 12,13 metal‐nonmetal elements 14-17 and double metal ions 18 have been attracted more attention, which could further improve the photocatalytic activity of TiO2. Co-doping with transition metal and nonmetal elements such as Fe-N, V-N and W-C could effectively modify the electronic structures of TiO2 and shift its absorption edge to a low energy 16. We have reported that the use of hydrocarbon surfactants as the template and nonmetal doping precursor in the self-assembly sol–gel methods to tailor-design the structural properties of TiO2 from molecular
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