Jump to main content
Jump to site search
PLANNED MAINTENANCE Close the message box

Scheduled maintenance upgrade on Thursday 4th of May 2017 from 8.00am to 9.00am (BST).

During this time our websites will be offline temporarily. If you have any questions please use the feedback button on this page. We apologise for any inconvenience this might cause and thank you for your patience.


Issue 12, 2011
Previous Article Next Article

Insight into the crystal lattice formation of brookite in aqueous ammonia media: the electrolyte effect

Author affiliations

Abstract

A feasible approach to synthesize pure brookite was achieved in an aqueous ammonia system via a hydrothermal process. By hydrothermal treatment of the titanate that directly hydrolyzed from tetrabutyl titanate (TBOT), a phase transition from titanate to TiO2 was observed with XRD. Anatase TiO2 was produced with an unobstructed closure of titanate layers. The phase transition process can be controlled by adding an electrolyte such as NaCl into the hydrothermal media. Na+ ions locally stop the direct closure of titanate layers at their adjacent position, which induce the formation of a brookite-like structure. The optimal hydrothermal reaction parameters for the crystal lattice formation of brookite in aqueous ammonia media were found to be 180 °C, 0.5 M NaCl and ≥72 h. The phase transition process of titanate precursor to TiO2 depends heavily on the electrolyte. Metal cations play a crucial role in conducting the transition procedure from layered titanate into brookite or anatase. Na+ is preferred to conduct the phase transition from titanate to brookite rather than K+ and Li+. Although anions do not determine the phase transition rule during the hydrothermal process, they are influential in the phase transition process, as they can promote the phase transition by interacting with the TiO6 octahedra.

Graphical abstract: Insight into the crystal lattice formation of brookite in aqueous ammonia media: the electrolyte effect

Back to tab navigation
Please wait while Download options loads

Publication details

The article was received on 09 Dec 2010, accepted on 28 Mar 2011 and first published on 12 May 2011


Article type: Paper
DOI: 10.1039/C0CE00932F
Citation: CrystEngComm, 2011,13, 4167-4173
  •   Request permissions

    Insight into the crystal lattice formation of brookite in aqueous ammonia media: the electrolyte effect

    Y. Jiao, B. Zhao, F. Chen and J. Zhang, CrystEngComm, 2011, 13, 4167
    DOI: 10.1039/C0CE00932F

Search articles by author