Relaxation Time of Proton Adsorption from Solution onto Magnetite and Anatase: Classical and New Theoretical ApproachReportar como inadecuado




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Croatica Chemica Acta, Vol.80 No.3-4 November 2007. -

The pH dependence of relaxation time of proton adsorption was analyzed by the classical Theory of Activated Adsorption and Desorption TAAD and the recently developed Statistical Rate Theory of Interfacial Transport SRT. It was found that both models predicted different behaviour of relaxation time as a function of pH. Since SRT and TAAD give an identical result for relaxation time of adsorption of uncharged species, it is suggested that the surface potential is a key factor in ion adsorption kinetics. Additionally, only the order of magnitude of the ion adsorption rate constant can be estimated from the analysis of experimental data because the surface potential and the total concentration of adsorption sites are not known exactly.

magnetite; anatase; proton adsorption; kinetics; relaxation time; statistical rate theory



Autor: Wojciech Piasecki - ; Group for Theoretical Problems of Adsorption, Institute of Catalysis and Surface Chemistry, Polish Academy

Fuente: http://hrcak.srce.hr/



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