Factors influencing the mechanism of surfactant catalyzed reaction of vitamin C-ferric chloride hexahydrate system

Autor:	Robina Kauser, Rohana Adnan, Muhammad Akhyar Farrukh
Rok vydání:	2013
Předmět:	Arrhenius equation Surface tension symbols.namesake Reaction mechanism Gibbs isotherm Aqueous solution Pulmonary surfactant Chemistry Critical micelle concentration Inorganic chemistry symbols Physical and Theoretical Chemistry Eyring equation
Zdroj:	Russian Journal of Physical Chemistry A. 87:1462-1469
ISSN:	1531-863X 0036-0244
DOI:	10.1134/s003602441309032x
Popis:	The kinetics of vitamin C by ferric chloride hexahydrate has been investigated in the aqueous eth� anol solution of basic surfactant viz. octadecylamine (ODA) under pseudofirst order conditions. The critical micelle concentration (CMC) of surfactant was determined by surface tension measurement. The effect of pH (2.5-4.5) and temperature (15-35°C) in the presence and absence of surfactant were investigated. Acti� vation parameters, ΔEa, ΔH # , ΔS # , ΔG ≠ , for the reaction were calculated by using Arrhenius and Eyring plot. Surface excess concentration (Γ max ), minimum area per surfactant molecule (A min ), average area occupied by each molecule of surfactant (a), surface pressure at the CMC (Πmax), Gibb's energy of micellization ( ), Gibb's energy of adsorption ( ), were calculated. It was found that the reaction in the presence of surfac� tant showed faster oxidation rate than the aqueous ethanol solution. Reaction mechanism has been deduced in the presence and absence of surfactant.
Databáze:	OpenAIRE
Externí odkaz:	https://explore.openaire.eu/search/publication?articleId=doi_________::13a56b8186248942106766e0bb57f3da https://doi.org/10.1134/s003602441309032x Zobrazit plný text záznamu Full text from SpringerLink