摘要
为了减轻汽车尾气排放所造成的大气环境污染,研究开发出一种可降解汽车尾气的纳米二氧化钛基沥青路面涂层材料。通过室内模拟试验,对尾气中有害成分NO的光催化降解效果进行了研究,并探讨了涂层材料中偶联剂的用量和紫外光的强度等不同因素对降解效果的影响。试验结果表明:在紫外光照时间为1h、气体初始浓度为(1.000±0.010)mg/L的条件下,应用于沥青路面表层的光催化材料能够有效降解NO;当光照强度为22.5 W/m2、纳米TiO2用量为8.9g/m2时,降解率最高可达到65.6%;涂层材料在使用一段时间后,经过冲刷作用,其光催化降解性能又可得以恢复。
In order to reduce atmospheric environment pollution caused by automobile exhaust, a kind of coating material of asphalt pavement named Nano-TiO2 was de- signed, which can degrade vehicle emissions. Through indoor simulation experiment, the photocatalytic degradation effect of nitric oxide which is a harmful ingredient in automo- bile exhaust was tested, and the effects of different factors such as the amount of cou- pling agent in the coating material and the change of intensity of ultraviolet light on deg- radation of NO are discussed. The results show that under the condition that when the ultraviolet irradiation period is an hour and the initial concentration of the gas is （1.000 ±0.010） mg/L, photocatalytic materials applied in asphalt pavement can degrade the nitric oxide effectively.When the light intensity is 22.5 W/m2 and the amount of Nano- TiO2 is 8.9 g/m2 ,the highest degradation ratio can equal to 65.6 %.After the coating ma- terial being used over some period, the photocatalytic degradation performance can be re- stored by flushing action.
出处
《交通科学与工程》
2016年第1期29-32,38,共5页
Journal of Transport Science and Engineering
基金
交通运输部应用基础研究项目(2014319825250)
