Sedimentation of nanoparticle titanium dioxide in the presence of ammonium

Duo Li; Nan Xu

doi:10.24294/can.v4i2.1333

Sedimentation of nanoparticle titanium dioxide in the presence of ammonium

Duo Li, Nan Xu

Article ID: 1333
Vol 4, Issue 2, 2021

VIEWS - 844 (Abstract) 191 (PDF)

Abstract

Due to its physicochemical properties, nanoparticles titanium dioxide (nTiO₂) is being put into mass production and widespread applications, which inevitably results in their increasing exposure to the water body. After it entering the water body, the chemical properties of nTiO₂ can be influenced by ion compositions, ion strength and pH, which affects their ecological risk. Excess of ammonium (NH₄⁺) fertilizer has contaminated soil and water environments. In this paper, the Zeta potentials and hydrodynamic radius of nTiO₂ were studied in NH₄⁺ solution compared to those in Na⁺ solution. In addition, the sedimentation rate of nTiO₂ was also investigated. The experiment results show that high pH inhibits the sedimentation of nTiO₂. Moreover, NH₄⁺ increases the stability of nTiO₂ more than Na⁺ at the same IS, which was attributed the more negative Zeta potentials and the smaller hydraulic radius. Our results provide a theoretical basis for evaluating the ecological risk of nTiO₂ in aqueous solution containing NH₄⁺.

Keywords

Ammonium; Chloride; Nanoparticles Titanium Dioxide (nTiO2); Sedimentation; Zeta Potential

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DOI: https://doi.org/10.24294/can.v4i2.1333