摘要
纳米TiO_(2)作为一种新兴光催化环保材料,已广泛应用于空气净化等领域。为进一步推进纳米TiO_(2)在道路汽车尾气降解方面的应用,制备了纳米TiO_(2)光催化尾气降解涂料,并开展了汽车尾气降解效果的室内试验,测定了光催化沥青混合料试件在不同TiO_(2)含量、分散剂SDS用量、光照条件下的降解率。结果表明:随着纳米TiO_(2)浓度的增加,各气体的降解率总体呈现先上升后下降的趋势,综合各气体的降解率变化情况,推荐3%为纳米TiO_(2)最佳浓度;当表面活性剂SDS含量为3%时,对纳米TiO_(2)催化降解反应具有较为明显的作用,SDS的增加对CO、CO_(2)的降解略有提高,而对HC和NO的降解率有降低作用或者没有影响;相较于紫外等照射的条件,自然光条件下的纳米TiO_(2)催化路面依然有较好的尾气降解效率。
As an emerging photocatalytic environmental protection material,nano-TiO_(2) has been widely used in many fields such as air purification at present.In order to further promote the application of nano-TiO_(2) in road vehicle exhaust degradation,this study prepared nano-TiO_(2) photocatalytic exhaust degradation coatings and carried out indoor tests on the degradation effect of automobile exhaust,and determined the degradation rate of photocatalytic asphalt mixture specimens under different TiO_(2) content,dispersant SDS dosage,and light conditions.The results show that:with the increase of nano-TiO_(2) concentration,the degradation rate of each gas shows a general trend of increasing and then decreasing,and 3%is recommended as the optimal concentration of nano-TiO_(2) after integrating the changes of degradation rate of each gas.When the content of surfactant SDS is 3%,it has a more obvious effect on the catalytic degradation reaction of nano-TiO_(2),and the degradation of CO and CO_(2) is slightly improved by the increase of SDS,while the degradation of HC and NO is slightly improved by the increase of SDS.The increase of SDS slightly improved the degradation of CO and CO_(2),while the degradation rate of HC and NO was reduced or had no effect.Compared with the conditions of UV and other irradiation,the nano-TiO_(2)-catalysed road surface under natural light conditions still had a better degradation efficiency.
作者
董锦俊
张瑞
DONG Jinjun;ZHANG Rui(Nantong Highway Development Centre,Jiangsu Nantong 226007 China;The Key Laboratory of Road and Traffic Engineering,Ministry of Education,Tongji University,Shanghai 201804 China)
