Molecular recognitive photocatalysis driven by the selective adsorption on layered titanates

Yusuke Ide, Yuri Nakasato, Makoto Ogawa

Research output: Contribution to journalArticle

80 Citations (Scopus)

Abstract

The composition of layered alkali titanates (MxTi 2-x/3Lix/3O4; M = K+, Li+ Na+) was tuned to control the swelling of the titanates in water and subsequently achieve molecular-sieve-like molecular recognitive photocatalytic decomposition of aqueous organic compounds on the titanates. Layered potassium lithium titanates with different layer charge density, KxTi 2-x/3Lix/3O4 (x = 0.61, 0.67, and 0.74), was first synthesized and then the interlayer K+ was quantitatively exchanged with Li+ and Na+ to form LixTi 2x-/3- Lix/3O4 (X= 0.61, 0.67, and 0.76) and NaxTi2-x/3Lix/3O4 0.61, 0.67, and 0.76). The water adsorption/ desorption isotherms and X-ray diffraction patterns of the titanates revealed that the pristine K-type titanates hardly hydrated, while the Li+- and Na+-exchanged titanates expanded the interlayer space upon the hydration and the degree in the hydration was larger for the Na forms than for the Li ones and depended on the layer charge density. The present titanates were found to selectively adsorb benzene from an aqueous mixture of benzene, phenol, and 4-butylphenol and subsequently decompose benzene upon UV irradiation. The efficiency of the molecular recognitive photocatalytic benzene decomposition was related to the degree in the swelling of the titanates in water.

Original languageEnglish
Pages (from-to)3601-3604
Number of pages4
JournalJournal of the American Chemical Society
Volume132
Issue number10
DOIs
Publication statusPublished - 2010 Mar 17

ASJC Scopus subject areas

  • Chemistry(all)
  • Catalysis
  • Biochemistry
  • Colloid and Surface Chemistry

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