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Mobile v. Adsorbed Hydroxyl Radical

  1. May 31, 2013 #1
    In the linked article,

    http://pubs.acs.org/doi/abs/10.1021/jp036735i

    the authors describe the generation of "free" or "mobile" OH radicals on surface fluorinated TiO2,

    [tex]\text{Ti}-\text{F}+\text{H}_2\text{O}~(\text{or }\text{OH}^-)+h_\text{vb}^+\longrightarrow \text{T}-\text{F}+\text{OH}^{\cdot}_\text{free}+\text{H}^+[/tex]

    and adsorbed OH radicals on naked TiO2,

    [tex]\text{Ti}-\text{OH}+h_\text{vb}^+\longrightarrow\text{Ti}-\text{OH}^{\cdot+}[/tex]

    The authors also go on to say that surface fluorination inhibits hole transfer paths because "... adsorption or complexation is prohibited on F-TiO2." If this is true, how does the first equation work? In other words, if OH- or H2O isn't adsorbed on F-TiO2, how is the OH radical formed? Doesn't the hole transfer have to occur on the surface? How can the hole oxidize OH- to the OH radical if it's never adsorbed?
     
  2. jcsd
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