Abstract
Nitrogen-doped TiO2 has a great potential as a photocatalyst under visible light irradiation with applications in the removal of air and water pollutants, and the treatment of bacterial contaminations. In this study, nitrogen-doped TiO2 nanoparticles were synthesized via the sol–gel method and a post-annealing heat treatment approach. The effects of annealing treatment on the photocatalyst crystalline size and degree of crystallinity were analyzed. Methylene blue dye was used as the model water contaminant for the evaluation of the photoactivity of the synthesized nitrogen-doped TiO2 nanoparticles. The degradation of methylene blue was attributed to three mechanisms, i.e., adsorption, photocatalysis, and direct light photolysis. A kinetic model was developed to distinguish the impact of these three different mechanisms on the removal of contaminants. Adsorption and photocatalysis are heterogeneous processes for removing water organic contaminants. The characterization analysis demonstrates that they are relevant to the microstructures and surface chemical compositions of nitrogen-doped TiO2 photocatalysts. The processing–structure–performance relationship helped to determine the optimal processing parameters for nitrogen-doped TiO2 photocatalyst to achieve the best performance. While we used methylene blue as the model contaminant, the generalized quantitative model framework developed in this study can be extended to other types of contaminants after proper calibration.
Highlights
TiO2 as a photocatalyst has attracted extensive research interest as a promising material for eliminating air and water contaminants due to its many advantages, i.e., nontoxicity, good chemical stability, and relatively low cost [1,2,3,4,5,6,7]
Nitrogen-doped TiO2 photocatalysts were synthesized via the sol–gel method and a post-annealing heat treatment approach
These characteristics are relevant to the adsorption and photocatalysis effects of the nitrogen-doped
Summary
TiO2 as a photocatalyst has attracted extensive research interest as a promising material for eliminating air and water contaminants due to its many advantages, i.e., nontoxicity, good chemical stability, and relatively low cost [1,2,3,4,5,6,7]. The N-TiO2 photocatalyst facilitates the degradation of the organic contaminants processes [20,21,22]. In addition to adsorption and photocatalysis, have a strong oxidizing ability to degrade the adsorbed organic contaminants. Adsorption, photocatalysis, and direct photolysis occur these chemical processes are of practical importance for industrial applications. We carried out related experiments kinetic model combines adsorption, photocatalysis, and direct photolysis. This work represents a comprehensive quantitative model for the (Ntitania (N-TiO2 ) nanoparticle-assisted photocatalytic degradation of nitrogen-doped organic dyes intitania aqueous. This study experimentally investigated the effects of synthesis and processing conditions on the structural features of titania nanoparticle-based photocatalyst as well as their performance This sheds light on the processing–structure–performance relationship in visible-light-driven N-doped quantitative model framework can be extended to other types of contaminants after proper calibration. TiO2 photocatalysts and will help to determine the optimal processing parameters that achieve the best performance
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