Ozone (O3) has long been used in water/wastewater treatment as an oxidant and/or disinfectant, ascribed to its high oxidation potential (2.07V) and bactericidal properties. Ozone-based AOPs (e.g. O3/UV, O3/H2O2) have the advantages of simplicity, strong oxidation potential, and no toxic residual in the treated water. In particular, heterogeneous catalytic ozonation has attracted much attention due to the high efficiency for the removal of refractory organic compounds compared to ozonation alone, and easy catalysts separation compared to homogeneous catalytic ozonation. However, the application of heterogeneous catalytic ozonation on a full scale is still very limited due to many challenges, such as the surface properties and/or stability of the catalyst, the effect of water matrices, limited catalytic reactivity, and formation of toxic byproducts. In order to advance heterogeneous catalytic ozonation processes in water/wastewater treatment, we have systematically investigated the stability of solid catalysts during ozonation, effects of water matrices commonly-used in laboratory studies, and development of a novel plasmon-enhanced catalytic ozonation process. Metal/metal oxides are the most commonly-used ozonation catalysts. Here we rigorously examined the stability of representative metal oxide catalysts and the results showed that the homogeneous catalytic effects resulting from the leached metal ions were significant. We also demonstrated that the catalyst stability can be improved by Atomic Layer Deposition (ALD) overcoating. Further, studies on heterogeneous catalytic ozonation usually start with well controlled water matrices to facilitate mechanism investigation. While this seems to be a rational and valid research approach, the different solution chemical conditions of different controlled matrices need to be carefully examined. Our study indicated that the water matrices not only provide the buffering capacities, but also affect the catalytic ozonation process in various aspects. Lastly, we aim to enhance the efficiency of catalytic ozonation processes by utilizing surface plasmon resonance of plasmonic metal based catalysts. The promising performance of plasmon-mediated catalytic ozoantion for the elimination of recalcitrant organic pollutants suggests this could be an effective strategy to advance heterogeneous catalytic ozonation processes for sustainable water treatment and reuse.

Advancing heterogeneous catalytic ozonation for water treatment and reuse

Macromolecular Chemistry: The Second Century

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ACS Spring 2020 National Meeting & Expo

The official archive and repository for all ACS Meetings & Expositions abstracts and select posters or presentations.