Modification of Cement Surface Layer by SiO2@N-TiO2 Photocatalyst
To solve the problem of TiO2 can not be tightly bonded with the surface of cement-based material,different photocatalytic materials(SiO2@N-TiO2)were designed and synthesized by changing the addition order and amount of urea and the reaction temperature.Their degradation effects on the target pollutants(NOx and rhodamine B)were studied.The results show that the degradation efficiency of NOx in the sample after adding urea at 55℃can reach 68%,which is 278%higher than that of the unmodified sample(SiO2@TiO2).The degradation rate of rhodamine B can reach 38%,which is a little higher than that of SiO2@TiO2.It still has good degradation efficiency for NOx after being applied to the surface of cement-based materials,which proves that the photocatalyst has good coupling ability with the cement surface.
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