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<table>Apparent first-order linear transform ln (n<sub>0</sub>/n) = f(t) of the p-nitrophenol concentration during its degradation; UV-light: (▴)—bare TiO<sub>2</sub>, (▪)—13% AC-TiO<sub>2</sub>; solar light: (▵)—bare TiO2, (□)—13 % AC-TiO2 .</table>

International Journal of Photoenergy

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Figure 4: Increase of the Photocatalytic Activity of <svg style="vertical-align:-4.50008pt;width:44.5px;" id="M1" height="21.0375" version="1.1" viewBox="0 0 44.5 21.0375" width="44.5"  xmlns="http://www.w3.org/2000/svg">
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International Journal of Photoenergy

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Increase of the Photocatalytic Activity of by Carbon and Iron Modifications