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It is difficult to tell that there is no electron transfer when no UV peak shifts. But the transient state UV spectroscopy can help. But the easy way to detect electron transfer is from measuring the oxidation state change for TiO2, for instance, using XPS.

About the fluorescence, add blank ethynol without TiO2 to the system, detect the intensity change of fluorescence. If it decrease as observed before, it indicates the decreasing comes from ethynol dilution
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