MgO{sub x} submonolayer formation on TiO{sub 2} and its effect on the photocatalytic oxidation of sodium dodecylbenzenesulfonate

Journal Article · Tue Feb 01 04:00:00 EST 2000 · Journal of the Electrochemical Society

DOI:https://doi.org/10.1149/1.1393242· OSTI ID:20023349

Tada, Hiroaki; Yamamoto, Miwako; Ito, Seishiro

A magnesium oxide (MgO{sub x}) layer has been formed on TiO{sub 2} particles by a method consisting of irreversible adsorption of [Mg(acac){sub 2}](process 1) and the subsequent oxidation (process 2). The quantitative analysis of X-ray photoelectron spectroscopic data indicate that the MgO{sub x} submonolayer grows into a monolayer upon seven-time repetition of process 1 and 2. Coating TiO{sub 2} with the MgO{sub x} submonolayer (coverage {approx_equal}0.5) increases the point of zero charge from 7.5 to 8.7 and significantly enhances TiO{sub 2} photocatalytic oxidation of sodium dodecylbenzenesulfonate (DBS). The kinetic analyses reveal that the submonolayer coverage increases both the adsorption equilibrium constant (K) and the rate constant for surface oxidation of DBS. The increase in K can be attributed to the electrostatic attraction between the surface (Mg{sub s}-OH{sub 2}{sup +}) and DBS{sup {minus}} anions.

• Research Organization: Kinki Univ., Higashi-Osaka (JP)
• OSTI ID: 20023349
• Journal Information: Journal of the Electrochemical Society, Journal Name: Journal of the Electrochemical Society Journal Issue: 2 Vol. 147; ISSN JESOAN; ISSN 0013-4651
• Country of Publication: United States
• Language: English

Related Subjects

14 SOLAR ENERGY
32 ENERGY CONSERVATION, CONSUMPTION, AND UTILIZATION
CATALYSTS
MAGNESIUM OXIDES
OXIDATION
PHOTOLYSIS
SULFONATES
TITANIUM OXIDES
WASTE WATER
WATER TREATMENT