户外大型水泥混凝土护栏降解氮氧化物技术和性能研究

Study on the Decontamination of Nitrogen Oxides by the outside Cement Concrete Barrier

为净化汽车尾气排放的氮氧化物(NOx),采用液态喷涂的负载方法,使城市混凝土护栏具有光催化降解NOx的环保特性。本实验就如何使护栏表面的光催化材料在雨水冲刷等表面磨损作用下保持长期的稳定性和有效性提出可行性改进措施,并且进一步优化了光催化料浆配比方案。结果表明,表面活性剂十二烷基苯磺酸钠掺量为ST(由H2SO4酸化处理过的TiO2)质量的3.5%,ST浆液质量浓度为2.0g/L,渗透剂(硅烷偶联剂KH550)最佳掺量为光催化料浆体积的2%,在小于等于1.5mm的磨损范围内,ST光催化材料均表现了良好的净化效果。

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 have showed 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 moidified 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 1.5 mm, ST photocatalytic materials show good purification effect.