Abstract
Single doping and co-doping of N and Ag on TiO2 were successfully prepared by using an in-situ solvothermal method and their structural properties and chemical compositions were characterized. The results indicated that all photocatalysts displayed in TiO2 anatase crystal phase, and a small mesoporous structure was observed in the doped materials. The main roles of N and Ag on the property and photocatalytic activity of TiO2 were different. The N doping has significantly enhanced homogenous surface morphology and specific surface area of the photocatalyst. While Ag doping was narrowing the band gap energy, extending light absorption toward a visible region by surface plasmon resonance as well as delaying the recombination rate of electron and hole of TiO2. The existence of N in TiO2 lattice was observed in two structural linkages such as substitutional nitrogen (Ti-O-N) and interstitial nitrogen (O-Ti-N). Silver species could be in the form of Ag0 and Ag2O. The photocatalytic performance of the photocatalysts coated on stainless steel mesh was investigated by the degradation of aqueous MB and gas phase NH3 under visible LED light illumination for three recycling runs. The highest photocatalytic activity and recyclability were reached in 5% N/Ag-TiO2 showing the efficiency of 98.82% for methylene blue (MB) dye degradation and 37.5% for NH3 removal in 6 h, which was 2.7 and 4.3 times, respectively. This is greater than that of pure TiO2. This was due to the synergistic effect of N and Ag doping.
Highlights
Since the industrialization and agricultural productivities are growing up steadily, which results in the rising levels of water and air pollution in the environment
The chemical treatment technology, the photocatalytic oxidation reaction (PCO), is one of the most feasibility chemical processes for solving the problem of environmental issues because it has a decomposability of a wide variety of hazardous organic and inorganic pollutants [3,4,5]
According to the characteristic properties of the obtained photocatalyst, the results revealed that the main roles of N and Ag on the properties of the TiO2 photocatalyst were different
Summary
Since the industrialization and agricultural productivities are growing up steadily, which results in the rising levels of water and air pollution in the environment. The environmental pollutants can be divided into two major groups, which include the organic pollutants (such as volatile organic compounds (VOCs) and dyes) and the inorganic pollutants (such as NH3 , H2 S, and other metal ions). Those pollutants directly impact on the human and well-being. The chemical treatment technology, the photocatalytic oxidation reaction (PCO), is one of the most feasibility chemical processes for solving the problem of environmental issues because it has a decomposability of a wide variety of hazardous organic and inorganic pollutants [3,4,5]. Titanium dioxide (TiO2 ) [6] is the most promising photocatalytic material suitable for industrial and commercial applications at the present and it will have received much more attention in the future because TiO2 has many advantages including non-toxicity, low cost, high photosensitivity, and a strong photocatalytic reaction [7]
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