Abstract
In this paper, the role of the trace ammonium ions on the stability of TiO2 sol prepared by peroxo titanic acid (PTA) sol was investigated. The results showed that the removal of ammonium ions in PTA sol is beneficial to reduce agglomeration and increase the negative charge on the surface of TiO2 colloidal particles, contributing to the higher stability and longer storage time of the TiO2 sol. It was also approved by the increase of interaction energy calculated by classical DLVO theory. In addition, the photocatalytic performance of TiO2 sol was improved due to the decrease of aggregation of TiO2 colloidal particles.
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