【摘 要】
：
The degradation of rhodamine B on the surface of self-cleaning mortar with P25 titanium dioxide was investigated.Mortar samples containing 1%, 3%, 5% P25 titanium dioxide were prepared with several wa
【机 构】
：
Department of building materials engineering, College of materials science and engineering, Chongqin
【出 处】
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The 14th International Congress on the Chemistry of Cement (
论文部分内容阅读
The degradation of rhodamine B on the surface of self-cleaning mortar with P25 titanium dioxide was investigated.Mortar samples containing 1%, 3%, 5% P25 titanium dioxide were prepared with several water to cement ratios.The degradation process involved rhodamine B solution changing from aqueous state to solid state.A digital image analysis method was established to measure the photocatalysis effect of self-cleaning mortar through rhodamine B decolorization.Based on the app developed in this work, the color variation data was obtained and modelled with first-order reaction.The results indicated the whole degradation process were fitted with two-step pseudo first-order reaction model, started with high rate constant kl and ended with much lower rate constant k2.The kinetic parameters of mortar prepared with the same w/c ratio have little difference among different titanium dioxide concentrations (1%, 3%, 5%) and the average values of kl, k2 are about 1.47 h-l, 0.0223 h-l, respectively.However, as revealed in this study, the effect of water to cement ratio on photocatalysis was remarkable.With same titanium dioxide content, the kinetic parameters kl, k2 of sample prepared with w/c 0.4 are much lower than the samples with w/c ratio 0.5 and 0.6.
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