Abstract
Based on the three-dimensional network structure of a polymer and the principle of photocatalysts, a visible-light-responsive and durable photocatalytic coating for the degradation of vehicle exhaust (VE) has been constructed using a waterborne acrylic acid emulsion as the coating substrate; Fe/N/Co–TiO2 nanoparticles (NPs) as photocatalytic components; and water, pigments, and fillers as additives. The visible-light-responsive Fe/N/Co–TiO2 NPs with an average size of 100 nm were prepared by sol-gel method firstly. The co-doping of three elements extended the absorption range of the modified TiO2 nanoparticles to the visible light region, and showed the highest light absorption intensity, which was confirmed by the ultraviolet-visible absorption spectra (UV-Vis). X-ray diffraction (XRD) measurements showed that element doping prevents the transition from anatase to rutile and increases the transition temperature. TiO2 was successfully doped due to the reduction of the chemical binding energy of Ti, as revealed by X-ray photoelectron spectroscopy (XPS). The degradation rates of NOX, CO, and CO2 in VE by Fe/N/Co–TiO2 NPs under visible light were 71.43%, 23.79%, and 21.09%, respectively. In contrast, under the same conditions, the degradation efficiencies of coating for VE decreased slightly. Moreover, the elementary properties of the coating, including pencil hardness, adhesive strength, water resistance, salt, and alkali resistance met the code requirement. The photocatalytic coating exhibited favorable reusability and durability, as shown by the reusability and exposure test.
Highlights
With the rapid development of highway transportation and urban construction in the world, vehicle exhaust (VE) has gradually become the main source of air pollution in the world [1,2,3]
The effects of Fe, N, and Co doping on the crystal size, micro-structure, and photocatalytic performance of Fe/N/Co–TiO2 were investigated
The degradation rates of NOX, CO, and CO2 in VE under visible light reached 71.43%, 23.79%, and 21.09%, respectively
Summary
With the rapid development of highway transportation and urban construction in the world, vehicle exhaust (VE) has gradually become the main source of air pollution in the world [1,2,3]. With the control of policies, the emission of air pollution in the world was considerably reduced [4,5]; the concentration of air pollutants is still high, especially in traffic-intensive urban areas [6,7,8,9]. Because of the chemical and thermal stability, high refractive index, nontoxicity, and wide band gap energy of TiO2 [22,23,24], it has been used as one kind of light harvester in the areas of air purification, water treatment, and deodorization [13].
Sign-in/Register to view highlights & summary Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
