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Complex Formation via Hydrogen bonding between Rhodamine B and Montmorillonite in Aqueous Solution. Public Deposited

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https://scholar.colorado.edu/concern/articles/hq37vp32z
Abstract
  • This study investigates the adsorption mechanism differences among four nitrogenous dyes, sulforhodamine G (SRG), uncharged/deprotonated rhodamine B (RhB), orange II (Or II) and methyl blue (MB) by montmorillonite (MMT). MMT adsorption capacity for cationic MB was three times that of uncharged RhB and anionic SRG, while anionic Or II was not absorbed. Colloidal MMT particles have two types of surfaces, basal and edge, that interact with nitrogenous dyes very differently. The surface acidity of MMT was characterized with the pyridine adsorption method using in-situ diffuse reflectance infrared Fourier transform spectroscopy (in-situ DRIFTS). Adsorption of cationic MB was compared with the adsorption of RhB. In-situ attenuated total reflectance Fourier transform infrared (in-situ ATR-FTIR) spectroscopy indicated that a nitrogen atom on RhB complexes with a metal hydroxyl on an MMT edge through a water bridge. The highly polar edge hydroxyl is important to hydrogen bond formation. Cation ion exchange and washing experiments, as well as studies on the effect of temperature, pH and ionic strength on adsorption further clarified the adsorption mechanism. Our results provide insights into the effects of molecular structure on the adsorption of nitrogenous dyes by clay and the role of edge surfaces in the adsorption process.
Creator
Date Issued
  • 2018-01-10
Academic Affiliation
Journal Title
Journal Issue/Number
  • 1
Journal Volume
  • 8
File Extent
  • 229-229
Subject
Last Modified
  • 2019-12-06
Identifier
  • PubMed ID: 29321609
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DOI
ISSN
  • 2045-2322
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