Modified blue TiO 2 nanostructures for efficient photo-oxidative removal of harmful NO x gases
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pISSN: 0256-1115 eISSN: 1975-7220
INVITED REVIEW PAPER
INVITED REVIEW PAPER
Modified blue TiO2 nanostructures for efficient photo-oxidative removal of harmful NOx gases Hao Huy Nguyen*, Gobinda Gyawali**,†, Adriana Martinez-Oviedo***, Hoang Phuc Nguyen****, and Soo Wohn Lee***,† *Faculty of Applied Sciences, Ton Duc Thang University, Ho Chi Minh City, Vietnam **Department of Fusion Science and Technology, Sun Moon University, Asan 31460, Korea ***Department of Environmental and Bio-chemical Engineering, Sun Moon University, Asan 31460, Korea ****Research Center for Eco-Multifunctional Nano Materials, Sun Moon University, Asan 31460, Korea (Received 21 January 2020 • Revised 22 April 2020 • Accepted 27 April 2020) AbstractBlue TiO2 nanostructures were produced via Lithium/ethylenediamine (Li/EDA) reduction method and applied for photo-oxidative removal of harmful NOx gases under simulated solar light irradiation. Blue TiO2 possesses some unique physicochemical properties such as enhanced visible-light absorption, superficial defects or oxygen vacancies, and the evolution of Ti3+ species. Moreover, the photoluminescence spectra (PL) revealed the efficient separation of photoinduced electron-hole pairs in the modified blue TiO2 nanostructures, enhancing their photocatalytic activities. The results indicated that the blue TiO2 nanostructures exhibited the highest performance towards photo-oxidation of NOx gases, with an efficiency of 72.6% under simulated solar light irradiation. Keywords: Photocatalyst, Blue TiO2, Oxygen Vacancy, NOx Gas
reduction process could be an option. In this process, ammonia (NH3) or urea (NH2CONH2) is injected into the firebox of the boiler at high temperature to react with the nitrogen oxides formed in the combustion process [7,8]. Because of the chemical redox reaction, nitrogen gas is produced instead of NOx based on the following possible reactions:
INTRODUCTION Air pollution is fully acknowledged as a major environmental problem owing to its direct influence on the ecosystem and all living organisms. Exhaust gases after burning fossil fuels are the main contributors to air pollution. These gases are mainly composed of carbon monoxide (CO), carbon dioxide (CO2), sulfur dioxide (SO2), and the different forms of nitrogen oxides (NOx) [1]. Among them, NOx, which refers mainly to a mixture of NO and NO2, has been paid much attention to scientists due to adverse effects on the environment and living organisms. The emission of NOx in the atmosphere is responsible for serious environmental concerns, including acid rain, photochemical smog, and stratospheric ozone depletion [1-3]. Moreover, NOx gases affect the respiratory system, causing inflammation in the respiratory tracks and lungs. Also, long-term exposure to NOx can reduce lung function and increase the risk of respiratory disease [4,5]. In addition, NOx gas has revealed that it can have a harmful effect on the physiological metabolism and content of secondary metabolites in plants, causing oxidative damage to nucleic acids, proteins
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