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Facet-mediated interaction between humic acid and TiO2 nanoparticles: implications for aggregation and stability kinetics in aquatic environments

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Abstract

Interfacial interactions between TiO2 nanocrystals and the surrounding environmental media play a critical role in dictating their environmental behaviors. Here two specific-faceted TiO2 crystals, {101} facet and {001} facet, were adopted to investigate facet-mediated aggregation kinetics in aquatic environments. In pristine electrolyte solution (NaCl and CaCl2), {001} TiO2 exhibited higher stability than {101} TiO2 due to the abundant –OH groups on the {001} facet surface. The presence of Suwannee river humic acid (SRHA) significantly improved the stability of TiO2 nanocrystals in a facet dependent manner, in which {101} TiO2 exhibited a more remarkable improvement in stability than {001} TiO2. At a high SRHA concentration (10 mg L−1), both faceted TiO2 displayed comparable stability. The adsorption experiments and attenuated total reflectance Fourier transformation infrared spectroscopy demonstrated that {101} TiO2 induced more pronounced adsorption of SRHA molecules than {001} TiO2, probably driven by the efficient bidentate coordination of –COO– groups in SRHA on the {101} facet. This facet-affected colloidal stability behavior would deepen our understanding on nanomaterial transport and exposure in natural waters.

Graphical abstract: Facet-mediated interaction between humic acid and TiO2 nanoparticles: implications for aggregation and stability kinetics in aquatic environments

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Publication details

The article was received on 26 Feb 2019, accepted on 19 Apr 2019 and first published on 24 Apr 2019


Article type: Paper
DOI: 10.1039/C9EN00231F
Environ. Sci.: Nano, 2019, Advance Article

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    Facet-mediated interaction between humic acid and TiO2 nanoparticles: implications for aggregation and stability kinetics in aquatic environments

    H. Zhang, W. Wang, H. Zhao, L. Zhao, L. Gan and L. Guo, Environ. Sci.: Nano, 2019, Advance Article , DOI: 10.1039/C9EN00231F

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