Photocatalytic oxidation of nitrogen oxides (NO x ) using Ag- and Pt-doped TiO 2 nanoparticles under visible light irrad
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RESEARCH ARTICLE
Photocatalytic oxidation of nitrogen oxides (NOx) using Agand Pt-doped TiO2 nanoparticles under visible light irradiation Essam M. Abdelsalam 1 & Yasser M. A. Mohamed 2
&
Saber Abdelkhalik 3 & Hossam A. El Nazer 2 & Yasser Attia Attia 1
Received: 19 March 2020 / Accepted: 8 June 2020 # Springer-Verlag GmbH Germany, part of Springer Nature 2020
Abstract In this work, titanium dioxide nanoparticles (TiO2 NPs) and modified TiO2 NPs with silver (Ag) or platinum (Pt) dopant were developed through photodeposition method for the NOx conversion into nitric acid (HNO3) under visible light irradiation. The formed photocatalysts TiO2, Ag/TiO2, and Pt/TiO2 nanocomposites were characterized by utilizing TEM, SEM, energydispersive X-ray analysis (EDX), XRD, UV/visible diffuse reflectance spectroscopy (UV-Vis DRS), and FT-IR. It had been investigated that an enhancement within the conversion of NOx into HNO3 was increased from 34.3 to 78.3% for Ag/TiO2 and from 35.2 to 78.5% for Pt/TiO2 under visible light irradiation conditions at room temperature for less than 2 h. The photodegradation rate order of NOx under visible light irradiation is Pt/TiO2 ~ Ag/TiO2 > TiO2. A possible mechanism for the catalytic conversion of NOx gases has been proposed, which depends on the photogeneration of electrons and holes after the excitation of nanocatalysts under visible radiation that promoted superoxide and hydroxyl ions, which can depredate NOx gases. This approach of NOx photocatalytic conversion is characterized by its chemical stability, low cost, high efficiency, simple operation, and strong durability than traditional methods. Keywords Nitrogen oxides conversion . Photocatalytic degradation . TiO2 nanoparticles . Ag/TiO2 nanocomposites . Pt/TiO2 nanocomposites
Introduction The family of nitrogen oxides (NOx) is a very important and interesting air-polluting chemical compounds. The NO, NO2, and N2O compounds are considered as the main gases that are presented in the NOx group. N2O and NO are colorless and odorless gases, while nitrogen dioxide (NO2) can often be seen as a reddish-brown layer along in the air. The most prevalent form of NOx in the atmosphere is the nitrogen dioxide (NO2) that is generated
Responsible Editor: Sami Rtimi * Yasser Attia Attia [email protected] 1
National Institute of Laser Enhanced Sciences, Cairo University, Giza 12613, Egypt
2
Photochemistry Department, National Research Center, Dokki, Giza 12622, Egypt
3
Air Quality Lab, Cairo University Center for Hazard Mitigation, Giza 12613, Egypt
by human activities and reacts in the atmosphere to form ozone (O3) and acid rain, which threatens human health and the environment (Martinez et al. 2011; Janus et al. 2015; Guo et al. 2012). The conversion of these pollutants to friendly environmental components is a big challenge and needs to be studied and tested to have a safer and more economical solution. The most promising technique for the conversion of undesirable or poisonous compounds from the environment such as nitrogen oxides
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