Efficient Photodecomposition of NO x on Carbon Modified Ag/TiO 2 Nanocomposites
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ORIGINAL PAPER
Efficient Photodecomposition of NOx on Carbon Modified Ag/TiO2 Nanocomposites Ling‑Chieh Li1 · Yao‑Hsuan Tseng1 · Hsin‑yu Lin2
© Springer Science+Business Media, LLC, part of Springer Nature 2020
Abstract A serial of carbon modified Ag/TiO2 photocatalysts have been synthesized with different carbon content by a simple coimpregnation method. Here, 1-pentanol was used as carbon precursor. The carbon modified Ag/TiO2 nanocomposites were characterized by X-ray diffraction, raman spectroscopy, thermal gravity analysis, UV–vis diffuse reflectance spectra, photoluminescence, and X-ray photoelectron spectroscopy. The photocatalytic removal of nitrogen oxides was carried out under both UV light and visible light irradiation. Our results revealed that carbon and silver species showed strong synergistic effect which significantly enhance the photocatalytic NOx removal on TiO2 photocatalyst under visible light irradiation. Keywords Visible light activation · Carbon-silver modified TiO2 · NOx · Phtocatalysis
1 Introduction Volatile organic compounds, such as contain carbon monoxide (CO), carbon dioxide (CO2), sulfur dioxide (SO2), nitrogen oxide ( NOx), heavy metals and some hydrocarbons, cause many problems, including being harmful to the environment and human health. Great efforts have been devoted to develop efficient catalytic technique for VOC removal [1–4]. Among them, developing a photocatalytic system for pollutant control using light is a topic of great interest, and is of fundamental as well as practical importance. The photocatalytic destruction of pollutant such as volatile organic compounds, dye pollutants, is a cheap, clean and safe process with high stability and efficiency. When a semiconductor photocatalyst is illuminated with photons with energies greater than its band gap, electron–hole pairs are generated due to photoexcitation. Highly reactive species such as hydroxyl radicals, superoxide anion and hydrogen peroxide generated by the photo-excited holes and electrons of the photocatalyst are
* Yao‑Hsuan Tseng [email protected] 1
Department of Chemical Engineering, National Taiwan University of Science and Technology, Taipei 10607, Taiwan
Department of Materials Science and Engineering, National Dong Hwa University, Hualien 97401, Taiwan
2
powerful oxidizing agents which can destroy either organic or inorganic pollutants. Titanium oxide, in both the anatase and the rutile crystallography phases, is widely used as photocatalyst for wastewater treatment and destruction of volatile organic compounds. The atmospheric pollutants such as volatile organic compounds (VOCs) and nitric oxides can be removed by TiO2 photocatalysts under UV light or near-UV light irradiation [5]. However, it is still a challenge to synthesize high efficiency TiO2 based photocatalysts under visible light irradiation. Numerous studies have been devoted to develop visible-light-driven TiO2 based photocatalyst by doping transition metal such as iron [6] and nickel [7] and non-metal elements [8]. C
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