Adsorption of methylene blue onto aluminum-containing mesoporous silica films prepared by rapid solvent evaporation method

Takahiro Yoshikawa, Tomoyuki Nakamura, Kazuyuki Kuroda, Makoto Ogawa

Research output: Contribution to journalArticle

11 Citations (Scopus)

Abstract

The adsorption of methylene blue onto aluminum-containing mesoporous silica films was investigated. The mesoporous silica films were synthesized by rapid solvent evaporation method using tetramethoxysilane, aluminum tri(s-butoxide), and trimethyloctadecylammonium chloride as a silica source, alumina source and supramolecular template, respectively. Methylene blue was adsorbed effectively on the mesoporous silica films from solutions. The adsorbed amount increased with the increase in the aluminum content of the films, indicating that the added aluminum generated the adsorption sites (probably acidic sites) for methylene blue adsorption. The mesopore surface is not strongly acidic because the protonation of methylene blue did not occur. Adsorbed methylene blue exists as monomers in the mesopore. The dehydration of the films resulted in the aggregation of methylene blue, as evidenced by the visible absorption spectra.

Original languageEnglish
Pages (from-to)2589-2594
Number of pages6
JournalBulletin of the Chemical Society of Japan
Volume75
Issue number12
DOIs
Publication statusPublished - 2002 Dec 1

ASJC Scopus subject areas

  • Chemistry(all)

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