title: In situ infrared spectroscopic analysis of the adsorption of aromatic carboxylic acids to TiO2, ZrO2, Al2O3, and Ta2O5 from aqueous solutions.
abstract: In situ infrared spectroscopy has been used to investigate the adsorption of a range of simple aromatic carboxylic acids from aqueous solution to metal oxides. Thin films of TiO2, ZrO2, Al2O3 and Ta2O5 were prepared by evaporation of aqueous sols on single reflection ZnSe prisms. Benzoic acid adsorbed very strongly to ZrO2, in a bridging bidentate fashion, but showed only weak adsorption to TiO2 and Ta2O5. Substituted aromatic carboxylic acids; salicylic, phthalic and thiosalicylic, were found to adsorb to each metal oxide. Salicylic and phthalic acids adsorbed to the metal oxides via bidentate interactions, involving coordination through both carboxylate and substituent groups. Thiosalicylic acid adsorbed to the metal oxides as a bridging bidentate carboxylate with no coordination through the thiol substituent group.
authors.affiliation: Department of Chemistry, University of Otago, Dunedin, New Zealand.
authors.forename: K D
authors.initials: KD
authors.lastname: Dobson
authors.forename: A J
authors.initials: AJ
authors.lastname: McQuillan
mesh_terms: D000537:Aluminum Oxide / Q000737:chemistry; D001565:Benzoates / Q000737:chemistry; D019817:Benzoic Acid / Q000737:chemistry; D002264:Carboxylic Acids / Q000737:chemistry*; D010087:Oxides / Q000737:chemistry; D010795:Phthalic Acids / Q000737:chemistry; D020156:Salicylic Acid / Q000737:chemistry; D013055:Spectrophotometry, Infrared / Q000379:methods*; D013438:Sulfhydryl Compounds; D013635:Tantalum / Q000737:chemistry; D013849:Thimerosal; D014025:Titanium / Q000737:chemistry; D015040:Zirconium / Q000737:chemistry
chemical_list: D001565:Benzoates; D002264:Carboxylic Acids; D010087:Oxides; D010795:Phthalic Acids; D013438:Sulfhydryl Compounds; C026196:2-thiosalicylic acid; C009495:titanium dioxide; D013849:Thimerosal; D013635:Tantalum; D019817:Benzoic Acid; D015040:Zirconium; D014025:Titanium; D000537:Aluminum Oxide; D020156:Salicylic Acid; C078151:tantalum oxide; C028541:zirconium oxide