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Purification of automobile exhaust gas by activated carbon supported Fe3+ modified nano-TiO2 and its application on asphalt pavement
Road Materials and Pavement Design ( IF 3.7 ) Pub Date : 2020-05-19 , DOI: 10.1080/14680629.2020.1763831
Junan Lei 1 , Nanxiang Zheng 1 , Fan Luo 1 , Yongtai He 1
Affiliation  

Automobile exhaust gas discharged into the air not only pollutes the environment but also seriously harms human health. Although pure nano-TiO2 has a purified effect on exhaust gas, it has a wide band-gap, a narrow response range of visible light, and is prone to agglomerate, leading to the lower catalytic efficiency. In this study, Fe3+ doping and activated carbon loading were used to compositely modify TiO2 to extend the spectral response range and dispersion performance of TiO2. Firstly, activated carbon supported Fe3+ modified nano-TiO2 (Fe-TiO2/AC) composite catalysts were prepared by sol–gel method. Then the specimens were characterised by X-ray diffraction (XRD), Fourier transform infrared spectroscopy (FTIR), and ultraviolet–visible spectrophotometer (UV-Vis). The micro-structures were observed by scanning electron microscopy (SEM). Based on the self-developed exhaust gas test system, the effects of the activated carbon dosage, light source, temperature, catalyst dosage and other factors on the catalytic performance were investigated. Finally, the application method and effect of the catalyst in the asphalt pavement was explored. The results showed that with the increase of Fe3+ content, the grain size of nano-TiO2 decreases gradually, the band-gap narrows gradually, and the response range to visible light broadens gradually. The activated carbon loading not only increases the dispersibility of the nano-TiO2 but also increases the absorption of the exhaust gas. The Fe-TiO2/AC composite catalyst has the best degradation effect on CO, NO and HC exhaust gas, which is better than pure nano-TiO2 and Fe3+ modified TiO2. By using the spraying method, the catalytic performance of Fe-TiO2/AC photocatalyst combined with OGFC asphalt mixture reaches the maximum. With the increase of wear times, the degradation effect of the test specimen on the exhaust gas was reduced, the rate of decrease was fast, then slowly, and finally the degradation performance gradually tends to be stable.



中文翻译:

活性炭负载Fe3+改性纳米TiO2净化汽车尾气及其在沥青路面上的应用

汽车尾气排放到空气中,不仅污染环境,而且严重危害人体健康。纯纳米TiO 2虽然对废气有净化作用,但其禁带宽度大,可见光响应范围窄,容易团聚,催化效率较低。在这项研究中,铁3+掺杂和活性炭负载被用来复合地修改的TiO 2延长TiO 2的光谱响应范围和分散性能2。首先,活性炭负载Fe 3+改性纳米TiO 2 (Fe-TiO 2/AC) 复合催化剂是通过溶胶-凝胶法制备的。然后通过 X 射线衍射 (XRD)、傅里叶变换红外光谱 (FTIR) 和紫外-可见分光光度计 (UV-Vis) 对样品进行表征。通过扫描电子显微镜(SEM)观察微观结构。基于自主研发的尾气测试系统,考察了活性炭用量、光源、温度、催化剂用量等因素对催化性能的影响。最后,探讨了催化剂在沥青路面中的应用方法及效果。结果表明,随着Fe 3+含量的增加,纳米TiO 2的晶粒尺寸逐渐减小,带隙逐渐变窄,对可见光的响应范围逐渐变宽。活性炭负载不仅增加了纳米TiO 2的分散性,而且增加了废气的吸收。Fe-TiO 2 /AC复合催化剂对CO、NO和HC废气的降解效果最好,优于纯纳米TiO 2和Fe 3+改性TiO 2。Fe-TiO 2的催化性能采用喷涂法/AC光触媒结合OGFC沥青混合料达到最大值。随着磨损次数的增加,试件对废气的降解作用减弱,降低的速度先快后慢,最后降解性能逐渐趋于稳定。

更新日期:2020-05-19
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