PROTON NMR STUDIES ON RHODAMINE B IN AN AQUEOUS CLAY SUSPENSION

• TANI SEIJI

  Graduate School of Science and Engineering, Yamaguchi University:Department of Chemistry, Faculty of Science, Yamaguchi University

• YAMAKI HIROSHI

  Graduate School of Medicine, Yamaguchi University

• NAKAYAMA DAISUKE

  Department of Chemistry, Faculty of Science, Yamaguchi University

• SUZUKI YASUTAKA

  Graduate School of Medicine, Yamaguchi University

• KAWAMATA JUN

  Department of Chemistry, Faculty of Science, Yamaguchi University:Graduate School of Medicine, Yamaguchi University

抄録

The dynamics of rhodamine B (RB) in D_2O solutions was examined in the absence and presence of a smectite clay mineral, synthetic sodium-saponite (SSA), by ^1H nuclear magnetic resonance (NMR) spectroscopy. Hybridization of RB with the exfoliated SSA particles significantly decreased the intensity of NMR resonance signals of RB protons with the linewidth broadening, compared to RB alone. This indicated that the dynamics of RB molecules adsorbed onto the surface of SSA clay particles was very slower than in free state. The photodegradation profiles of RB in the presence of SSA clay particles were also monitored by ^1H NMR spectroscopy. After visible light irradiation, nine new resonance signals resulting from reaction products were detected in the ^1H NMR spectrum. The analysis of two-dimensional ^1H-^1H COSY and TOCSY spectra of the reaction mixture indicated that the ethyl group(s) of RB molecule adsorbed onto the surface of SSA particles was destroyed in the photodegradation process and that not only N-ethylamine (and/or N,N-diethylamine) as a major product but also other chemical species such as acetoaldehyde, acetic acid and formic acid were also produced. The detection of the minor products by NMR indicated the photodegradation of RB dye under the present experimental conditions involves oxidative reaction processes in which RB itself and/or the N-de-ethylation products react with the dissolved oxygen to produce the minor chemical species.

収録刊行物

• Ｃｌａｙ　Ｓｃｉｅｎｃｅ

  Ｃｌａｙ　Ｓｃｉｅｎｃｅ 14 (2), 81-86, 2009

  一般社団法人 日本粘土学会

キーワード

• NMR
• Synthetic saponite
• Rhodamine B
• Dye-clay hybrid
• Photodegradation

詳細情報

• CRID: 1390001204112058752
• NII論文ID: 110007339273
• NII書誌ID: AA00607148
• DOI: 10.11362/jcssjclayscience.14.2_81
• ISSN: 21863555
• ISSN: 00098574
• 本文言語コード: en
• データソース種別:
  • JaLC
  • CiNii Articles
  • KAKEN
• 抄録ライセンスフラグ: 使用不可