Re ECF Project: 2015-18

Project Title: Development and demonstration of photocatalytic asphalt for removal of roadside air pollutants

Applicant: Prof Michael K H LEUNG, City University of Hong Kong

Total Approved Grant: $499,680 (ECF & WWGF: 50/50)

Duration: 1/4/2016 to 30/9/2017

Project Status/Remarks: On-going

Recent overseas and Mainland investigations have shown that photocatalytic-asphalt-paved road can effectively remove roadside nitrogen oxides (NOx) and sulphur oxides (SOx) emitted by motor vehicles. The NO2 reduction is so significant that the photocatalytic asphalt could reduce our roadside NO2 below the air quality objective in Hong Kong. Since photocatalytic performance depends on not only the functional properties of the photocatalyst, but also the surrounding conditions, such as solar irradiance, humidity, temperature, precipitation, etc. it is necessary to conduct local research to investigate and demonstrate the effectiveness of photocatalytic asphalt on enhancement of our air quality.

The main purposes of this project are to:

1. develop commercially viable photocatalytic asphalts that can be activated by ultra-violate (UV) and visible (Vis) light;
2. obtain their performance characteristics in removal of NOx and SOx as well as their functional durability; and
3. evaluate the cost effectiveness.

Summary of the Findings/Outcomes:
To be available upon completion of the project