具有降解汽车尾气性能的纳米TiO_2光催化水泥浆体研究

Study on nano-TiO_2 photocatalytic cement paste with automobile exhaust degradation capacity

纳米TiO_2在紫外线的照射下,可将汽车尾气中有害的CO、HC及NO_x氧化为CO_2、H_2O、硝酸等无害物质,实现空气的净化。首先分析了纳米TiO_2光催化降解汽车尾气机理,然后研究了纳米TiO_2光催化水泥浆体的制备工艺与技术,通过试验分析了分散剂、分散方式、纳米TiO_2掺量等对光催化水泥浆体降解汽车尾气性能的影响规律。最后,研究了一种基于光催化产物的纳米TiO_2光催化水泥浆体降解汽车尾气性能的评价方法;将光催化水泥浆体应用于高速公路收费站,并对其光催化降解汽车尾气的性能进行了评价,结果表明,纳米TiO_2光催化水泥浆体具有优异的光催化性能和良好的应用前景。

With irradiation of ultraviolet light, harmful ingredients like CO, HC and NOx in automobile exhaust could be oxidized and converted into harmless ingredients like CO2, H2O, HNOa and so on by nano-TiO2, so as to implement the purification of air. At first, this paper analyzed photocatalytic mechanism of the nano-TiO2 that degraded automotive exhaust, and then fabrication techniques and technology of nano-TiO2 photocatalytic cement paste were studied. The effect rules that factors like dispersant, dispersion mode, nano-TiO2 doped a mount and so on influenced performance of nano-TiO2 photocatalytic cement paste were studied by experimems. Finally, a new evaluation methodology that focused on photocatalytic products of nano-TiO2 photoeatalytic cement paste was studied. The photocatalytic cement paste was used in expressway toll station and the photocatalyric degradation performance of automotive exhaust was evaluated. The results showed that nano-TiO2 photocatalytic cement paste had excellent photocatalytic performance and application prospect.