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Study on the technology and performance of the degradation of nitrogen oxides according to the outdoor large cement concrete barrier

ABSTRACT In terms of the study about the decontamination of nitrogen oxides by the outside barrier made of cement concrete, in order to purify NOx produced by auto exhaust, studies had utilized different spray-finishing technology to make the urban concrete barrier have the function of purification NOX. This paper has shown the improvements of how to make the photocatalytic materials on barrier surface maintain long-term stability and the effectiveness, and further optimize the ratio of photocatalytic slurry. The results show that the content of surfactant (sodium dodecylbenzenesulfonate) is 3.5% of that of ST (TiO2 acidified by H2SO4); actual concentration of the ST slurry is 2.0 g/L; the best content of the penetrant (silane coupling agent KH550) is 2% of the photocatalytic slurry; within the wear range of less than 2 mm, ST photocatalytic materials showed good purification effect.