摘要
为探究低温环境下路面喷涂纳米TiO2降解汽车尾气效能,模拟低温环境,设计汽车尾气室内降解试验,观察有害气体(CO、HC、NO)的降解效能。将纳米TiO2浆料喷涂至车辙试件表面,放入自制密闭的低温试验仓,通入汽车尾气,达到设定的初始浓度时,开启仿太阳光灯,每隔10min开启尾气分析仪吸气装置6s,记录对应的气体浓度。试验结果表明:温度为-10℃时,在0~40min时间内各有害气体浓度降低速率均较大,在60min时,气体HC的平均浓度稳定在23.7ppm,CO的平均浓度稳定在0.13%,NO的平均浓度稳定0ppm。在相同的试验条件下,低温和常温环境,有害气体浓度曲线变化规律具有一致性,反应仓中HC、CO、NO的浓度均随时间增长逐渐下降,说明低温环境不影响光催化反应的进行,但低温对降解速率有一定的影响;纳米TiO2对汽车尾气中的NO气体降解效能可达100%,明显高于HC和CO,反映出纳米TiO2材料对NO气体降解效果最佳。在低温-10℃时,NO的平均降解速率高于常温20℃时,说明试验时温度对NO降解效能没有影响,但对NO降解速率有一定的影响。
In order to explore the degradation efficiency of automobile exhaust by nano-TiO2 spraying on pavement in low temperature environment and simulate low temperature environment,indoor degradation test of automobile exhaust was designed to observe the degradation efficiency of harmful gases (CO,HC,NO).The nano-sized TiO2 slurry was sprayed on the surface of rutting specimens,put into a self-made closed low-temperature test chamber,put into the automobile exhaust,and when the initial concentration was set,the imitation solar lamp was turned on,and the exhaust gas analyzer suction device was turned on every 10 minutes for 6 seconds to record the corresponding gas concentration.The results show that the decreasing rate of harmful gas concentration is larger in 0-40 min at - 10 C.At 60 min,the average concentration of HC,CO and NO is stable at 23.7 ppm,0.13% and 0 ppm respectively.Under the same experime ntal conditions,the concentration curve of harmful gases is consistent at low and normal temperatures.The concentration of HC,CO and NO in the reactor decreases gradually with the increase of time,which indicates that the low temperature environment does not affect the photocatalytic reaction,but the low temperature has some effect on the degradation rate.Nano-TiO2 can degrade NO in automobile exhaust effectively.It is 100% higher than HC and CO,reflecting that nano-TiO2 material has the best degradation effect on NO gas.At a low temperature of -10℃,the average degradation rate of NO is higher than the temperature of 20℃,indicating that the temperature has no effect on the degradation efficiency of NO,but has a certain effect on the degradation rate of NO.
作者
杨扬
刘海苹
钱国平
武鹤
王国峰
YANG Yang;LIU Haiping;QIAN Guoping;WU He;WANG Guofeng(College of Civil and Architectural Engineering,Heilongjiang Institute of Technology,Harbin 150050;School of Traffic and Transportation Engineering,Changsha University of Science and Technology,Changsha 410114)
出处
《森林工程》
2019年第6期72-76,85,共6页
Forest Engineering
基金
黑龙江省自然科学基金联合引导项目(LH2019E078)
哈尔滨市应用技术研究与开发项目青年后备人才计划(2014RFQXJ164)
关键词
低温
路面
喷涂
TIO2
降解
汽车尾气
Low temperature
pavement
spray
TiO2
degradation
automotive exhaust
