TiO2@C core@shell nanocomposites: a single precursor synthesis of photocatalyst for efficient solar water treatment

This study reports the facile synthesis of highly photoactive TiO2@C core@shell nanocomposites by using a single alkoxide precursor. TiO2 and carbon (C)-based hybrid nanomaterials are popular photocatalysts owing to their abundance, low toxicity and high stability. As such these materials are strong candidates for the development of practical solar water-treatment applications. However, synthesis of such nanomaterials is often a multi-step process and requires careful control of the external carbon source for producing the desired morphology. In this regard, the synthesis of well-dispersed TiO2@C nanocomposites is demonstrated herein without the need of an external carbon source. The resulting photocatalyst was employed for treatment of various water-borne pollutants including several dyes, pharmaceuticals, and pathogens. Rapid mineralization of pollutants could be achieved even with low amounts of catalyst. The as-prepared nanocomposites could easily outperform pristine TiO2 and P25 Degussa. Results indicate that incorporation of C increases visible-light absorption and greatly improves the separation of photogenerated charge carriers. Given the facile synthesis and the wide scope of operation, the proposed catalyst could be a significant step towards practical photocatalytic solar water-treatment.Graphical abstract
Source: Journal of Hazardous Materials - Category: Environmental Health Source Type: research