Influence of ionic strength on brookite content in sol-gel synthesized titania before and after hydrothermal aging

Sara L. Isley, Eric R. Anderson, R. Lee Penn

Research output: Chapter in Book/Report/Conference proceedingConference contribution

6 Scopus citations

Abstract

Sol-gel syntheses of nanoparticle titania commonly results in a mixture of anatase and brookite. Hydrothermal aging is a commonly performed post-sol-gel synthesis step, which generally results in a more crystalline product and larger crystallites. This work investigates the effect of increasing ionic strength on the phase composition of hydrothermally aged titania. Rietveld refinements were used to systematically track the brookite content and both anatase and brookite particle size. Results demonstrate that increasing ionic strength during hydrothermal aging has no effect on brookite content. The presence of chloride is concluded to have the most influence over the brookite content during the solgel synthesis and that the addition of chloride to chloride-free, solgel synthesized titania has no effect during hydrothermal aging. Photocatalysis results using particles of similar size but different phase composition suggest that particles with higher brookite content are less photocatalytically active than those with lower brookite content. Results suggest that substantial control over photocatalytic activity of titania nanoparticles can be achieved by modifying sol-gel synthesis conditions. copyright The Electrochemical Society.

Original languageEnglish (US)
Title of host publicationNanostructured Metal Oxides
Subtitle of host publicationProcessing and Applications
Pages37-46
Number of pages10
Edition9
DOIs
StatePublished - Dec 1 2006
EventNanostructured Metal Oxides: Processing and Applications - 210th Electrochemical Society Meeting - Cancun, Mexico
Duration: Oct 29 2006Nov 3 2006

Publication series

NameECS Transactions
Number9
Volume3
ISSN (Print)1938-5862
ISSN (Electronic)1938-6737

Other

OtherNanostructured Metal Oxides: Processing and Applications - 210th Electrochemical Society Meeting
CountryMexico
CityCancun
Period10/29/0611/3/06

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