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Dennis Y.C. Leung

Leading speaker for catalysis conference 2017 - Dennis Y.C. Leung

Title: Photocatalysis for degradation of environmental pollutants under VUV irradiation

Dennis Y.C. Leung

University of Hong Kong, Hong Kong

Biography

Professor Dennis Y.C. Leung is currently a full professor of the Department of Mechanical Engineering at the University of Hong Kong specializing in environmental pollution control and clean energy development. He has published more than 400 articles in this area including 220+ peer reviewed top SCI journal papers.  He was invited to publish more than 20 review articles in leading journals.  His current h-index is 54 with total citations more than 15,000. He is one of the top 1% highly cited scientists in the world in energy field since 2010 (Essential Science Indicators) until now. Professor Leung has delivered more than 50 keynote and invited speeches in many conferences as well as public lectures.  He serves as a chief editor or editorial board member of a number of journals including Frontiers in Environmental Sciences, Applied Energy, Journal of Power & Energy, just name a few.

Abstract

Photocatalytic oxidation (PCO) is one of the fastest developed technologies for the control of environmental pollutants (in both gaseous and aqueous state) as well as for energy production (such as hydrogen generation and dye-sensitized solar cell).  The PCO process is normally triggered by the irradiation of UV light. The most widely used UV sources in PCO are 254 nm and 365 nm UV lamp. However, conventional PCO process has disadvantages such as recombination of electron-hole pair leading to low efficiency and photocatalyst deactivation.  In order to improve the efficiency and stability of the PCO process, UV lamps with partial 185 nm UV irradiation (denoted as VUV lamp) can be used to activate photocatalysts. 185 nm VUV lamps cannot only irradiate photocatalyst but also generate active oxidants such as O radicle, OH radicle, and ozone all of which enhance the oxidation of the organic components in the nearby pollutants.  The VUV lamps are also facile, cheap, and energy efficient. In this paper, the results of VUV enhanced photocatalytic degradation of common VOCs (such as toluene and benzene) and water pollutants (such as methyl blue are acrylic wastewater) are presented and discussed. In addition, ozone is a byproduct generated in the process, which can enhance the oxidation but can also cause harmful effects on our health. The removal of the residue ozone using modified catalyst will also be discussed.

Audience Take away:

•    Learn the different processes of oxidation and reduction under VUV photocatalysis;
•    Learn how efficient the VUV photocatalysis on degrading air and water pollutants;
•    Learn how the ozone generated can help to degrade the pollutants and how the residue ozone can be totally removed.
•    Enhance the research on advanced oxidation processes (AOP).