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Removal of dye pollutants from water using sensitized TiO2 nanoparticles and visible light

Titanium dioxide nanoparticles have been widely used as photocatalysts for the elimination of organic pollutants from water. Sensitization of TiO2 nanoparticles with metal-free tris(styryl)benzene (TSB) compounds have proved to be an effective approach for improving the visible light activation of TiO2*. Thus, TSB compounds containing three aldehyde or carboxylic acid groups have been attached to the TiO2 surface through different chemical linkage.

Optical and computational studies led to elucidate the different mechanisms of sensitization (Type I or indirect electron injection and Type II or direct electron injection) between the TSB sensitizers and TiO2 nanoparticles. Hence, the influence of electronic injection mechanism has been investigated for the removal of two different types of dye pollutants from water. According to the results, tris(styryl)benzene-sensitized TiO2 nanoparticles could be successfully applied for water splitting or solar cells.

(*) Tuning of type-I and type-II mechanisms for visible light degradation in tris(styryl)benzene-sensitized TiO2 nanoparticles. Josefa Ortiz-Bustos, Isabel del Hierro, Antonio Sánchez-Ruiz, Joaquín C. García-Martínez and Yolanda Pérez. Dyes and Pigments 184 (2021) 108802.

https://www.sciencedirect.com/science/article/abs/pii/S0143720820314996

More information: Yolanda Pérez, Full professor at URJC & Senior Assistant Researcher, Advanced Porous Materials Unit, IMDEA Energy Institute, yolanda.perez@imdea.org

 

Event Date: 
Monday, September 6, 2021