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Title:

Performance of Visible-Light-Driven Photocatalytic Pavement in Reduction of Motor Vehicles’ Exhaust Gas

Accession Number:

01751884

Record Type:

Component

Availability:

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Order URL: http://worldcat.org/issn/03611981

Abstract:

Titanium dioxide (TiO2) is a widely used photocatalyst that can oxidize motor vehicle exhaust, for example, carbon monoxide (CO), nitrogen oxides (NOx), hydrocarbons, and sulfur dioxide, under the irradiation of sunlight. It has been reported that nano-scale TiO2 particles can be effectively used to modify the concrete-asphalt pavement, and make it as a photocatalytic pavement. However, the pure TiO2 additive limits its absorption spectrum to the ultraviolet region, which only occupies a small portion of sunlight irradiance. To increase the utilization of the full spectrum of sunlight, it has been demonstrated that doping TiO2 with substances such as Carbon (C), Nitrogen (N), or metal can reduce the band-gap and extend the threshold of the absorption spectrum to the visible light region. Therefore, doped-TiO2 has a better photocatalytic performance under sunlight irradiation. This paper conducted computational simulation of the kinetics of photocatalytic pavement to quantify the efficiency of doped-TiO2 embedded pavement in reducing exhaust gas from motor vehicles. A three-dimensional model is developed on a section of local road with doped-TiO2 embedded pavement. The effects of doped-TiO2 concentration, daylight conditions, and traffic flow conditions on the removal of NOx and CO were studied. The results indicate that the pavement with doped-TiO2 coating is effective to remove CO and NOx under different traffic density and daylight intensity conditions. Compared with UV activated TiO2, visible-light-activated doped-TiO2 features significantly higher removal efficiency of poisonous exhaustive gas including NOx and CO.

Supplemental Notes:

© National Academy of Sciences: Transportation Research Board 2020.

Language:

English

Authors:

Jiang, Zhuoying
Yu, Xiong (Bill)

Pagination:

pp 512-519

Publication Date:

2020-11

Serial:

Transportation Research Record: Journal of the Transportation Research Board

Volume: 2674
Issue Number: 11
Publisher: Sage Publications, Incorporated
ISSN: 0361-1981
EISSN: 2169-4052
Serial URL: http://journals.sagepub.com/home/trr

Media Type:

Web

Features:

References (41)

Subject Areas:

Environment; Highways; Pavements

Files:

TRIS, TRB, ATRI

Created Date:

Sep 11 2020 3:04PM