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Title: A study of competitive adsorption of organic molecules onto mineral oxides using DRIFTS

In this study, analysis of DRIFTS spectra was used for a quantitative study of competitive adsorption of myristic and salicylic acids onto kaolinite or γ-alumina. Peaks unique to the ring or the chain were selected and single molecule studies used as calibration. Samples were exposed to hexane solution containing equal molecular quantities of each acid. The surface loading of salicylic acid was not influenced by the presence of myristic acid on either mineral but the maximum loading of myristic acid was decreased (46-50%) by salicylic acid. Displacement of myristic acid from {gamma}-alumina, but not kaolinite, was observed when excess salicylic acid remained in solution. A 25% increase in the maximum loading was observed for kaolinite, but not for{gamma}-alumina. On {gamma}-alumina, after a loading of 1 molecule per nm2, increased exposure resulted in salicylic acid adsorption only, this value is approximately the same for salicylic acid adsorption from aqueous solution or for water washed hexane treated samples. Thus a set of sites for adsorption of either acid is indicated together with other energetically less favorable sites, which can be occupied by salicylic, but not by myristic, acid.
Authors:
;  [1]
  1. Thomas Jefferson National Accelerator Facility (TJNAF), Newport News, VA (United States); College of William and Mary, Williamsburg, VA (United States)
Publication Date:
OSTI Identifier:
1032482
Report Number(s):
JLAB-FEL--09-1056; DOE/OR/23177--0964
Journal ID: ISSN 0021-9797; JCISA5; TRN: US201202%%231
Grant/Contract Number:
AC05-06OR23177
Type:
Accepted Manuscript
Journal Name:
Journal of Colloid and Interface Science
Additional Journal Information:
Journal Volume: 342; Journal Issue: 2; Journal ID: ISSN 0021-9797
Research Org:
Thomas Jefferson National Accelerator Facility, Newport News, VA (United States)
Sponsoring Org:
USDOE Office of Science (SC)
Country of Publication:
United States
Language:
English
Subject:
37 INORGANIC, ORGANIC, PHYSICAL AND ANALYTICAL CHEMISTRY; ADSORPTION; AQUEOUS SOLUTIONS; CALIBRATION; CHAINS; HEXANE; KAOLINITE; OXIDES; SALICYLIC ACID; SPECTRA; TETRADECANOIC ACID; WATER infrared spectroscopy; DRIFTS; kaolinite; gamma alumina; adsorption; surface water; myristic acid; salicylic acid; hexane solvent