Synthesis, bifunctionalization, and remarkable adsorption performance of benzene-bridged periodic mesoporous organosilicas functionalized with high loadings of carboxylic acids

Hao Yiang Wu, Fa Kuen Shieh, Hsien Ming Kao, Yi Wen Chen, Juti Rani Deka, Shih Hsiang Liao, Kevin C.W. Wu

Research output: Contribution to journalArticlepeer-review

56 Scopus citations

Abstract

Highly ordered benzene-bridged periodic mesoporous organosilicas (PMOs) that were functionalized with exceptionally high loadings of carboxylic acid groups (COOH), up to 80 mol % based on silica, have been synthesized and their use as adsorbents for the adsorption of methylene blue (MB), a basic dye pollutant, and for the loading and release of doxorubicin (DOX), an anticancer drug, is demonstrated. These COOH-functionalized benzene-silicas were synthesized by the co-condensation of 1,4-bis(triethoxysilyl) benzene (BTEB) and carboxyethylsilanetriol sodium salt (CES), an organosilane that contained a carboxylic acid group, in the presence of non-ionic oligomeric surfactant Brij 76 in acidic medium. The materials thus obtained were characterized by a variety of techniques, including powder X-ray diffraction (XRD), nitrogen-adsorption/ desorption isotherms, TEM, and 13C and 29Si solid-state NMR spectroscopy. Owing to the exceptionally high loadings of COOH groups, their high surface areas, and possible π-π-stacking interactions, these adsorbents have very high adsorption capacities and extremely rapid adsorption rates for MB removal and for the controlled loading/release of DOX, thus manifesting their great potential for environmental and biomedical applications.

Original languageEnglish
Pages (from-to)6358-6367
Number of pages10
JournalChemistry - A European Journal
Volume19
Issue number20
DOIs
StatePublished - 10 May 2013

Keywords

  • carboxylic acids
  • doxorubicin
  • drug delivery
  • mesoporous materials
  • methylene blue

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