Diamond nanoparticles (NPs) purified conveniently by Fenton oxidation and modified by a subsequent H2 annealing reduction (D3) are an adequate support for small Ag NPs that are highly active as a (photo‐)Fenton catalyst for phenol degradation. The efficiency of the reaction is accelerated upon exposure to natural sunlight. Ag/D3 is fairly stable under the reaction conditions and could be reused eight times with a marginal decrease in activity to reach an accumulated turnover number of 472 000. Upon sunlight illumination, Ag/D3 can be active even at quasineutral pH values, although an increase of the phenol degradation rate is observed if the initial pH value decreases to 4. Ag/D3 was more efficient than Ag NPs supported on graphite, active carbon, or TiO2 and similar to Au/D3. Thus, it seems that Ag/D3 is one of most efficient heterogeneous (photo‐)Fenton catalysts ever reported.
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Espinosa et al. (2015) studied this question.
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