Synthesis and characterisation of silica-modified titania for photocatalytic decolouration of crystal violet

Mohammad Shahid, Ibrahim El Saliby, Leonard D. Tijing, Andrew McDonagh, Se Min Park, Kwang Young Lee, Ho Kyong Shon, Jong Ho Kim

Research output: Contribution to journalArticlepeer-review

4 Citations (Scopus)


In the past few years, silica-modified titania has drawn increasing attention due to their special properties making them ideal candidates for a wide range of applications. In this study, we report a novel method for the synthesis of silica-modified titania by a sol-gel method using sodium silicate solution (1 M). The hydrolysis and condensation reactions of titanium dioxide (TiO2 , Degussa Aeroxide ® P25) in sodium silicate solution proceeded with citric acid (3 M) as a catalyst. The orbital shaking method was followed for the removal of sodium salt formed during the sol-gel process. Solvent exchange was carried out using methanol and hexane. Finally, chemical modification of the gel was conducted using trimethylchlorosilane followed by ambient pressure drying. The obtained silica-modified titania was characterised for nanostructural analysis using scanning electron microscopy and transmission electron microscopy. The nitrogen adsorption-desorption measurements were employed to investigate the BET surface area, pore structure and pore volume of specimens. Thermal gravimetric analysis showed exothermic peaks at temperature range of 90-190 ° C representing the oxidation of organic groups from -Si-R network. The silica-modified titania showed high photocatalytic activity and an easy recovery using crystal violet as model water pollutant.

Original languageEnglish
Pages (from-to)5326-5329
Number of pages4
JournalJournal of Nanoscience and Nanotechnology
Issue number7
Publication statusPublished - 2015 Jul 1
Externally publishedYes


  • Crystal violet
  • Silica-Modified titania
  • Sol-Gel method

ASJC Scopus subject areas

  • Bioengineering
  • Chemistry(all)
  • Biomedical Engineering
  • Materials Science(all)
  • Condensed Matter Physics


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