TiO_(2)光催化水泥基材料降解汽车尾气研究

Study on TiO_(2)Photocatalytic Degradation of Automobile Exhaust by Cement-based Material

以纳米TiO_(2)和N-TiO_(2)作为光催化材料,以透水混凝土作为水泥基基底材料,制备出了光催化透水混凝土,测定了其不同光照条件下光催化降解汽车尾气的能力,并基于试验数据进行了光催化反应动力学的拟合计算。试验及计算结果表明:在2种光照条件下,纳米TiO_(2)和N-TiO_(2)光催化透水混凝土降解汽车尾气成分效率:NO_(x)>HC>CO;自然光照条件下,N-TiO_(2)涂层光催化降解汽车尾气能力低于纳米TiO_(2)涂层;在紫外光照下纳米TiO_(2)涂层降解汽车尾气中的CO试验反应动力学常数为6.40×10^(-3)min^(-1),自然光照下纳米TiO_(2)和N-TiO_(2)涂层反应动力学常数分别为2.67×10^(-3)min^(-1)和2.28×10^(-3)min^(-1)。

With nano-TiO_(2)and N-TiO_(2)as the photocatalytic materials and pervious concrete as the cement-based substrate material,the photocatalytic pervious concrete was prepared,and its photocatalytic degradation ability of automobile exhaust under different light conditions was tested,and the ftting calculation of photocatalytic reaction kinetics was carried out based on the experimental data.The experimental and calculation results show that under two kinds of light conditions,the degradation efficiency of automobile exhaust components by nano-TiO_(2)and N-TiO_(2)photocatalytic permeable concrete is NO_(x)>HC>CO;N-TiO_(2)coating has lower photocatalytic degradation ability than nano-TiO_(2)coating under natural light.The experimental kinetic constant of CO degradation in automobile exhaust by nano-TiO_(2)coating under UV rradiation is 6.40×10^(-3)min^(-1),the reaction kinetic constants of nano-TiO_(2)and N-TiO_(2)coatings under natural ilumination are2.67×10^(-3)min^(-1)and 2.28×10^(-3)min^(-1),respectively.