Jump to main content
Jump to site search


Factors impacting the aggregation/agglomeration and the photocatalytic activity of highly crystalline spheroid- and rod-shaped TiO2 nanoparticles in aqueous solutions

Abstract

We investigate the characteristics, fate and photocatalytic activity of spheroid and rod-shaped TiO2 nano-crystals in aqueous solutions to better understand their behaviour in media of biological and environmental interests. For this purpose, the potential of a solvothermal method to synthesizing highly crystalline nanoparticles and tuning their size/shape is explored. Spheroid and rod-shaped nanoparticles are successfully obtained with different aspect ratios, while keeping their structure as well as their cross-sectional area identical. The aggregation/agglomeration of these nanostructures in aqueous solutions shows an obvious shape effect, revealing critical coagulation concentrations (CCC) significantly lower for rods compared to spheroids (aspect ratio ~2-3). This trend is observed in both NaCl and CaCl2 electrolytes at pH values above and below pHPZC of TiO2 nanoparticles. The photocatalytic activity of spheroids is unexpectedly superior to that of rods at NaCl and CaCl2 concentrations over a range of 2 to 100 and 1 to 50 mM, respectively. Our results show that an increase of the chloride concentration leads to an inhibition of the photocatalytic activity rate, with a more pronounced impact for rods. By contrast, the size of aggregates/agglomerates has a little effect on the photocatalytic properties of both nano-crystals.

Back to tab navigation

Supplementary files

Publication details

The article was received on 30 Nov 2017, accepted on 29 Mar 2018 and first published on 05 Apr 2018


Article type: Paper
DOI: 10.1039/C7CP08054A
Citation: Phys. Chem. Chem. Phys., 2018, Accepted Manuscript
  •   Request permissions

    Factors impacting the aggregation/agglomeration and the photocatalytic activity of highly crystalline spheroid- and rod-shaped TiO2 nanoparticles in aqueous solutions

    T. Degabriel, E. Colaço, R. F. Domingos, K. El Kirat Chatel, D. Brouri, S. Casale, J. Landoulsi and J. Spadavecchia, Phys. Chem. Chem. Phys., 2018, Accepted Manuscript , DOI: 10.1039/C7CP08054A

Search articles by author

Spotlight

Advertisements