路面材料负载纳米二氧化钛光催化降解氮氧化物

随着汽车工业的发展，汽车尾气排放的氮氧化物对环境造成了巨大污染。以路面材料为载体，研究了负载型纳米二氧化钛对氮氧化物的降解作用。研究表明：水泥混凝土负载的光催化剂具有优越的光催化功能，而沥青混合料的较差。从载体对气体的吸附能力、吸光性和透光性等方面进一步研究了这两类载体的差异，提出了负载型纳米二氧化钛光催化降解氮氧化物的机理模型。

PHOTOCATALYTIC OXIDATION OF NITROGEN OXIDES BY NANO-TiO2 IMMOBILIZED ON ROAD SURFACE MATERIALS

With the development of automobile industry, the tail gas of motor vehicles is one of major air pollution sources. Effects of nano-TiO_(2) photocatalytic oxidation immobilized on road surface materials on nitrogen oxides were investigated. Results show that the photocatalyst immobilized on concrete exhibits excellent photocatalysis, while the photocatalysis of bituminous mixture is poor. Differences between concrete and bituminous admixture as carriers in the adsorb-ability of molecule to air on surface, the light absorption and the light transmissibility are discussed. Moreover the mechanism model for photocatalytic oxidation of nitrogen oxides by supportive nano-TiO_(2) photocatalyst is put forward.