Tensammetric determination of adsorption isotherms and adsorption kinetics of 2-Alkyl-5-hydroxy-1,3-dioxanes

Journal Article · Tue Mar 01 04:00:00 EST 1994 · Journal of Colloid and Interface Science; (United States)

DOI:https://doi.org/10.1006/jcis.1994.1081· OSTI ID:7045980

Adamczyk, Z; Para, G ^[1]

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1. Polish Academy of Sciences, Krakow (Poland). Inst. of Catalysis and Surface Chemistry

Nonequilibrium processes occurring at liquid-liquid or liquid-gas interfaces in contact with surfactant solutions are of great practical significance in many large-scale technological operations, e.g., emulsification, emulsion coalescence and breakup, enhanced oil recovery, foaming, flotation, extraction, detergency, etc. Adsorption isotherms and adsorption kinetics of nonionic surfactants at the mercury-electrolyte interface were determined using the a.c. polarography (tensammetry) method. The equilibrium adsorption isotherms (at 22 C) of cis and trans isomers of the 2-heptyl-5-hydroxy-1,3-dioxane (hereafter referred to as CHHD and THHD, respectively) were determined. It was found that for the trans isomer the experimental adsorption isotherm can adequately be described by the localized Langmuir model with negligible lateral interactions. On the other hand, for the CHHD the attractive lateral interactions played a considerable role, resulting in a Frumkin-type isotherm fitted well by the parameters a[sub F] = 1.85 and K[sub a] = 0.1 cm. The nonlocalized adsorption model of Halfand, Frisch, and Lebowitz (HFL) based on the two-dimensional hard sphere liquid approximation proved to be inadequate. Adsorption of CHHD on mercury was also studied for nonequilibrium (transient) conditions. The experimental results obtained for various bulk surfactant concentration were interpreted i terms of the exact numerical solutions of the governing mass transfer equation. A good agreement between the experimental kinetic measurements and the theoretical predictions was found, especially for longer adsorption times, suggesting that the Frumkin model can also be used for describing adsorption kinetic phenomena.

• OSTI ID: 7045980
• Journal Information: Journal of Colloid and Interface Science; (United States), Journal Name: Journal of Colloid and Interface Science; (United States) Vol. 163:1; ISSN 0021-9797; ISSN JCISA5
• Country of Publication: United States
• Language: English

Related Subjects

02 PETROLEUM
020300 -- Petroleum-- Drilling & Production
37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY
400201* -- Chemical & Physicochemical Properties
ADSORPTION
ADSORPTION ISOTHERMS
HETEROCYCLIC COMPOUNDS
ISOTHERMS
MATHEMATICAL MODELS
ORGANIC COMPOUNDS
ORGANIC OXYGEN COMPOUNDS
SORPTION
SURFACTANTS