Dear Colleagues,

Photocatalysis, which uses solar energy as renewable resource, is one of the most promising technologies for the elimination of toxic compounds from water, due to the advantages of high activity, photochemical stability and cost-efficiency. I  addition to aqueous applications, it can also significantly increase indoor air quality, addressing the so-called “sick building syndrome” and contribute to eliminating pollutants like VOCs both indoors and outdoors. Alongside oxidation, the photocatalytic reduction of harmful molecules (e.g., NOx) is an emerging field.

Photocatalytic synthesis is also a major field of green chemistry. It ranges from the artificial photosynthesis of converting CO₂ and H₂O into organic raw molecules to performing photocatalytic synthetic versions of more sophisticated organic processes, as examples.

There are many exciting resent materials and processes appearing in the photocatalytic research, including photonic bandgap structures, all-organic photocatalysts, etc.

Other hot topics in the filed include the use of computational chemistry and the application of extreme laser infrastructure to understand photon absorption, excitation and dissipation processes and the occurring photochemical reactions.

A great challenge in photocatalytic materials research is to increase their selectivity, robustness, electron–hole lifetime, and achieve a more optimal use of the solar spectrum.

Although there are already some practical, real-life applications, the major breakthrough of the everyday use of photocatalysis is still awaited. To achieve this, new laboratory and scaled-up setups and processes are needed, with robust catalysts and reactors.

Recently, a very successful Special Issue in the field was edited by us in Nanomaterials, titled Latest Developments in Photocatalytic Materials and Processes (https://www.mdpi.com/journal/nanomaterials/special_issues/Photocatalytic_Materials_Processes) .

The present Special Issue is the continuation of the previous one, and aims to collect further studies and results about the latest developments in the field of photocatalysis.

Dr. Imre Miklós Szilágyi
Dr. Klára Hernádi
Guest Editors

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• photocatalysis
• decontamination
• synthesis
• nanotechnology
• nanocomposites
• visible
• UV