Raman studies on the aluminate and carbonate anions in aqueous solutions

Zhou, Yixin (1995) Raman studies on the aluminate and carbonate anions in aqueous solutions. Masters thesis, Memorial University of Newfoundland.

[img] [English] PDF (Migrated (PDF/A Conversion) from original format: (application/pdf)) - Accepted Version
Available under License - The author retains copyright ownership and moral rights in this thesis. Neither the thesis nor substantial extracts from it may be printed or otherwise reproduced without the author's permission.

Download (9Mb)
  • [img] [English] PDF - Accepted Version
    Available under License - The author retains copyright ownership and moral rights in this thesis. Neither the thesis nor substantial extracts from it may be printed or otherwise reproduced without the author's permission.
    (Original Version)

Abstract

Sodium aluminate solutions and their precipitates have been investigated by Raman spectroscopy. All Raman data are consistent with the existence of Al(OH)₄⁻ and Al₂O(OH)₆ ²⁻ anionic species in sodium aluminate solutions. In supersaturated solutions, both anions are in equilibrium during the induction process. After the induction period, sodium aluminate solutions produce a precipitate which contains neither the Al(OH)₄⁻ anion nor the Al₂O(OH)₆ ²⁻ anion. -- Quantitative Raman studies with 0.23 M NaNO₃ as an internal standard were employed to elucidate the equilibria in sodium aluminate solutions. The best values of the molar scattering constants Ji are equal to 0.25 ± 0.03 for the Al(OH)₄⁻ and 0.57 ± 0.18 for the Al₂O(OH)₆ ²⁻ species relative to the 1.0 M NO₃⁻ ionic mode at 1052 cm⁻¹. With these Ji values the formation quotient Q and equilibrium constant K are estimated. -- In addition, studies of the effects of temperature on the Raman frequencies and halfwiths of CO₃²⁻, Al(OH)₄⁻ and Al(OD)₄ anions in H₂O and D₂O reveal evidence for the presence of strong hydrogen bonds between these anions and water. There is no significant change in the hydrogen band strength at temperatures up to 150°C.

Item Type: Thesis (Masters)
URI: http://research.library.mun.ca/id/eprint/4258
Item ID: 4258
Additional Information: Bibliography: leaves 82-86.
Department(s): Science, Faculty of > Chemistry
Date: 1995
Date Type: Submission
Library of Congress Subject Heading: Raman spectroscopy; Aluminates; Carbonates; Anions

Actions (login required)

View Item View Item

Downloads

Downloads per month over the past year

View more statistics