9.2. Effect of ozone concentration
For the effective degradation of pollutant molecules using photocatalytic
ozonation, ozone molecules should dissolve in the
aqueous solution, diffuse and adsorb onto the surface of the photocatalyst
to continue the oxidation process. Therefore, variations in
ozone concentration of the oxidation medium can significantly
influence many aspects of photocatalytic ozonation. For example,
the results for photocatalytic ozonation of oxalate anions in alkaline
solutions showed the adsorption constant value for oxalate
anions increased when the ozone concentration in the liquid phase
was increased [54]. This was attributed to the stabilisation of the
photogenerated positive holes on the photocatalyst surface as a
result of the reaction between photogenerated electrons and
adsorbed ozone molecules, which led to increased adsorption of
oxalate anions on the positively-charged photocatalyst surface.
Likewise, Jing et al. [84] showed that for the mineralisation of
dimethyl phthalate by photocatalytic ozonation, the effect of
increasing ozone concentration was greater than simple ozonation
or photo-ozonation, indicating a positive role for ozone adsorption
and decomposition processes on the photocatalyst surface.
9.2. Effect of ozone concentrationFor the effective degradation of pollutant molecules using photocatalyticozonation, ozone molecules should dissolve in theaqueous solution, diffuse and adsorb onto the surface of the photocatalystto continue the oxidation process. Therefore, variations inozone concentration of the oxidation medium can significantlyinfluence many aspects of photocatalytic ozonation. For example,the results for photocatalytic ozonation of oxalate anions in alkalinesolutions showed the adsorption constant value for oxalateanions increased when the ozone concentration in the liquid phasewas increased [54]. This was attributed to the stabilisation of thephotogenerated positive holes on the photocatalyst surface as aresult of the reaction between photogenerated electrons andadsorbed ozone molecules, which led to increased adsorption ofoxalate anions on the positively-charged photocatalyst surface.Likewise, Jing et al. [84] showed that for the mineralisation ofdimethyl phthalate by photocatalytic ozonation, the effect ofincreasing ozone concentration was greater than simple ozonationor photo-ozonation, indicating a positive role for ozone adsorptionand decomposition processes on the photocatalyst surface.
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9.2. Effect of ozone concentration
For the effective degradation of pollutant molecules using photocatalytic
ozonation, ozone molecules should dissolve in the
aqueous solution, diffuse and adsorb onto the surface of the photocatalyst
to continue the oxidation process. Therefore, variations in
ozone concentration of the oxidation medium can significantly
influence many aspects of photocatalytic ozonation. For example,
the results for photocatalytic ozonation of oxalate anions in alkaline
solutions showed the adsorption constant value for oxalate
anions increased when the ozone concentration in the liquid phase
was increased [54]. This was attributed to the stabilisation of the
photogenerated positive holes on the photocatalyst surface as a
result of the reaction between photogenerated electrons and
adsorbed ozone molecules, which led to increased adsorption of
oxalate anions on the positively-charged photocatalyst surface.
Likewise, Jing et al. [84] showed that for the mineralisation of
dimethyl phthalate by photocatalytic ozonation, the effect of
increasing ozone concentration was greater than simple ozonation
or photo-ozonation, indicating a positive role for ozone adsorption
and decomposition processes on the photocatalyst surface.
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