Masters Theses

Abstract

"The adsorption of dichromate ion with the surfactants, tetradecylpyridinium bromide and tetradecyltrimethylammonium bromide at the air-solution interface was studied by surface tension and turbidity measurements in order to better understand the process of ion flotation. Surface tension measurements were used to study the effect of dichromate ion concentration on precipitation in dilute surfactant solutions. At higher concentration, near and above the cmc, light scattering was used to detect precipitation. The concentration of dichromate required to cause precipitation decreases with increasing surfactant concentration until the erne is approached, after which increasing concentrations of dichromate are required with increasing concentration of surfactant. There is a minimum surfactant concentration necessary for formation of a stable foam network. This minimum concentration is 1.8 x 10⁻³ M for TPB and 3. 5 x 10⁻³ for TTMAB. The amount of dichromate removed in a given length of time does not vary greatly with surfactant concentration until the concentration of surfactant exceeds the erne. At higher concentrations flotation efficiency decreases with increasing surfactant concentration probably because the micelles are competing with the air-solution interface as adsorption sites for dichromate ions. In these batch type experiments it was possible to recover as much as 63% of the dichromate with TPB and 96% with TTMAB"--Abstract, page ii.

Advisor(s)

Venable, Raymond L., 1935-2008

Committee Member(s)

Stampfer, J. F.
Mayhan, Kenneth G.

Department(s)

Chemistry

Degree Name

M.S. in Chemistry

Publisher

University of Missouri--Rolla

Publication Date

1972

Pagination

vi, 39 pages

Rights

© 1972 Josephine Juch Wang, All rights reserved.

Document Type

Thesis - Open Access

File Type

text

Language

English

Subject Headings

Surface active agents -- AnalysisSurface tension -- MeasurementAdsorption

Thesis Number

T 2734

Print OCLC #

6033702

Electronic OCLC #

883306535

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Chemistry Commons

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