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This Special Issue on “Photocatalytic Processes for Environmental Applications” offers an overview of the different photochemical processes (photocatalysis, photo-Fenton, and photolysis) triggered by different inorganic compounds that can be used for environmental applications, including water treatments. Photocatalytic mechanisms are based on the generation of electron/hole (e−/h+) pairs under suitable irradiation (hν > Eg). For water treatment, these charge carriers can form reactive oxygen species (ROS), such as hydroxyl and superoxide anion radicals, that degrade aqueous organic pollutants efficiently. In this Special Issue, different heterogeneous photocatalysts, including TiO2, CdS, CoFe2O4 and vanadium-based oxides, are discussed regarding their efficiency in the degradation of organic pollutants in water. In addition, some of these photocatalysts are composed of chemical elements that are active in Fenton-based processes, thus exhibiting enhanced degradation extents. In addition to the use of materials in water treatments, homogeneous systems, including Fe(III)-EDDS photo-Fenton and H2O2 photolysis, are also discussed to provide further possibilities for photochemically-assisted water treatments. Another interesting method related to the efficient treatment of water is the use of photoelectrochemical (PEC) systems, where the WO3 photoanode can produce H2O2, which can be subsequently used as a reactant in photocatalysis, photo-Fenton and photolysis systems.

cobalt ferrite --- magnetic properties --- solution combustion method --- rhodamine B --- photocatalytic activity --- photoelectrocatalysis --- hydrogen peroxide --- WO3 --- ethanol --- glycerol --- Direct Blue 1 --- irradiated TiO2 --- heterogeneous photocatalysis --- electron-beam --- adsorption --- photo-Fenton --- EDDS --- 2,4-DCP --- organic matter --- inorganic ions --- natural water bodies --- VUV --- photoreactor --- CFD --- MB --- water treatment --- vanadium oxide --- photochemistry --- environment --- materials --- pollutant --- hydrogen --- CdS --- photocatalysis --- pseudo-first order kinetics --- n/a

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The recent developments in the environmental applications of heterogenous catalysis and photocatalysis are described in this book, focusing on air and water purification using innovative and performing catalysts and applying new green and sustainable processes.

Technology: general issues --- Chemical engineering --- ceria --- pesticide --- photocatalysis --- photo-Fenton --- AOPs --- thin films --- ZnO --- doping --- heterogeneous photocatalysis --- VOCs --- bimetallic catalysts --- air purification --- catalytic combustion --- China --- elimination technology --- pharmaceutical industry --- advanced oxidation processes --- ozone --- ultraviolet --- bleaching --- fabrics --- industrial wastewater --- zero valent iron --- magnetite --- hematite --- alkali-activated material --- geopolymer --- blast furnace slag --- catalytic wet peroxide oxidation --- Fe-catalyst --- bisphenol A --- Mn-Zr solid solution --- toluene --- active oxygen --- combustion --- VOC --- photothermo catalysis --- ethanol --- manganese oxide --- zirconium oxide --- hydrothermal preparation --- co-precipitation --- CuFeS2 --- Fenton-like reaction --- degradation --- environmental water samples --- ciprofloxacin --- levofloxacin --- gC3N4 --- rGO --- Au nanoparticles --- n/a

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Catalysts are widely used in a great variety of technologies, providing remarkable efficiency in order to address sustainable energy production, climate change challenges, and to reduce industrial emissions. In the framework of the Environmental Catalysis section promoted by the Catalysts Editorial Office, this Special Issue, entitled “Environmental Friendly Catalysts for Energy and Pollution Control Applications”, comprises novel studies representing the state-of-the-art research for efficient energy generation and industrial emission control based on new environmentally friendly catalyst materials (EFCs). In particular, in this Special Issue (SI), different kinds of catalysts are presented for catalytic solutions, including the reduction of NOx emissions (new zeolite catalyst modified with Pt), the elimination of volatile organic compounds (Co3O4@SiO2 and acidic surface transformed natural zeolite) and the removal of SO2 emissions (through adsorption processes with sodium citrate). Moreover, novel biocatalysts for bioanodes and new functional nanostructured catalysts based on metal–organic framework (MOFs) for different applications are also included. Additionally, articles compiled in this SI are also focused on the improvement of catalytic processes. Thus, selected processes based on activated carbons (modified with titanium dioxide) and optimized Fenton processes for the removal of aqueous organic pollutants or for the inactivation of bacteria are also presented.

Technology: general issues --- Environmental science, engineering & technology --- photocatalysis --- organic wastewater --- preparation method --- degradation --- characterizations --- hybridization --- exoelectrogen --- biocatalyst --- microenvironment --- porous electrode --- anaerobic --- recalcitrant compounds --- E. coli K12 --- methylene blue --- optimization --- Pareto chart --- perturbation graph --- Pt-based promoter --- CO oxidation --- environmental catalysis --- refinery compliance --- fluid catalytic cracking --- FCC --- sodium citrate --- sodium humate --- SO2 --- absorption --- BaQD --- carbamazepine --- ferric coordination complex --- photo-Fenton --- turbidity --- cyanide --- activated carbon --- titanium dioxide --- composites --- continuous flow --- adsorption --- catalytic ozonation --- Lewis and Brønsted acid sites --- natural zeolite --- reaction mechanism --- toluene --- three-phase modelling --- fixed-bed reactor --- wastewater treatment --- phenol --- granular activated carbon --- Ad/Ox --- volatile organic compounds --- core–shell structures --- spherical polymer templates --- Co3O4 --- Pd-based promoter --- NOx emission --- metal–organic frameworks --- heterogeneous catalysis --- carbon dioxide --- biomass --- hydrogenation --- oxidation --- Fisher-Tropsch --- photocatalysis --- organic wastewater --- preparation method --- degradation --- characterizations --- hybridization --- exoelectrogen --- biocatalyst --- microenvironment --- porous electrode --- anaerobic --- recalcitrant compounds --- E. coli K12 --- methylene blue --- optimization --- Pareto chart --- perturbation graph --- Pt-based promoter --- CO oxidation --- environmental catalysis --- refinery compliance --- fluid catalytic cracking --- FCC --- sodium citrate --- sodium humate --- SO2 --- absorption --- BaQD --- carbamazepine --- ferric coordination complex --- photo-Fenton --- turbidity --- cyanide --- activated carbon --- titanium dioxide --- composites --- continuous flow --- adsorption --- catalytic ozonation --- Lewis and Brønsted acid sites --- natural zeolite --- reaction mechanism --- toluene --- three-phase modelling --- fixed-bed reactor --- wastewater treatment --- phenol --- granular activated carbon --- Ad/Ox --- volatile organic compounds --- core–shell structures --- spherical polymer templates --- Co3O4 --- Pd-based promoter --- NOx emission --- metal–organic frameworks --- heterogeneous catalysis --- carbon dioxide --- biomass --- hydrogenation --- oxidation --- Fisher-Tropsch

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Photoactivity represents the ability of a material, generally speaking a semiconductor, to become active when interacting with light. It can be declined in many ways, and several functionalities arising from this behavior of materials can be exploited, all leading to positive repercussions on our environment. There are several classes of effects of photoactivity, all of which have been deeply investigated in the last few decades, allowing to develop more and more efficient materials and devices. All of them share a common point, that is, the interaction of a material with light, although many different materials are taken into account depending on the effect desired—from elemental semiconductors like silicon, to more complex compounds like CdTe or GaAs, to metal oxides like TiO2 and ZnO. Given the broadness of the field, a huge number of works fall within this topic, and new areas of discovery are constantly explored. The special issue “Novel Photoactive Materials” has been proposed as a means to present recent developments in the field, and for this reason the articles included touch different aspects of photoactivity, from photocatalysis to photovoltaics to light emitting materials.

photo-oxidation --- silver phosphate --- low power white-light LED irradiation --- artificial rain --- density functional theory (DFT) --- degradation --- photocatalytic --- hybrid nanomaterials --- band gap modification --- photodeposition --- perovskite solar cell --- titanium oxide --- titanium(IV) oxo-clusters --- photo-oxidative degradation --- confocal microscope --- composite materials --- 4-chlorophenol --- anodizing --- broadband spectra --- photoactivity --- durability --- bio-based substances --- photo Fenton --- crystallinity --- nanostructured materials --- hydrothermal --- TiO2 --- advanced oxidation processes --- charge dynamics --- mechanical property --- CH3 --- metal-halides perovskites --- DFT calculations --- sol-gel --- caffeine --- CuxO-ZnO catalyst --- water-repellency --- photocatalysis --- stone protection --- surfactant --- photovoltaics --- photoluminescence --- hydrothermal synthesis --- UV ageing --- Fe/N-TiO2 --- visible-light --- rhodamine B --- alkylalkoxysilane --- electron transport material --- organometal --- magnetic materials --- titanium dioxide --- ZnO --- organic light emitting diodes (OLEDs) --- toluene --- TiO2 nanoparticles

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Catalysts are widely used in a great variety of technologies, providing remarkable efficiency in order to address sustainable energy production, climate change challenges, and to reduce industrial emissions. In the framework of the Environmental Catalysis section promoted by the Catalysts Editorial Office, this Special Issue, entitled “Environmental Friendly Catalysts for Energy and Pollution Control Applications”, comprises novel studies representing the state-of-the-art research for efficient energy generation and industrial emission control based on new environmentally friendly catalyst materials (EFCs). In particular, in this Special Issue (SI), different kinds of catalysts are presented for catalytic solutions, including the reduction of NOx emissions (new zeolite catalyst modified with Pt), the elimination of volatile organic compounds (Co3O4@SiO2 and acidic surface transformed natural zeolite) and the removal of SO2 emissions (through adsorption processes with sodium citrate). Moreover, novel biocatalysts for bioanodes and new functional nanostructured catalysts based on metal–organic framework (MOFs) for different applications are also included. Additionally, articles compiled in this SI are also focused on the improvement of catalytic processes. Thus, selected processes based on activated carbons (modified with titanium dioxide) and optimized Fenton processes for the removal of aqueous organic pollutants or for the inactivation of bacteria are also presented.

photocatalysis --- organic wastewater --- preparation method --- degradation --- characterizations --- hybridization --- exoelectrogen --- biocatalyst --- microenvironment --- porous electrode --- anaerobic --- recalcitrant compounds --- E. coli K12 --- methylene blue --- optimization --- Pareto chart --- perturbation graph --- Pt-based promoter --- CO oxidation --- environmental catalysis --- refinery compliance --- fluid catalytic cracking --- FCC --- sodium citrate --- sodium humate --- SO2 --- absorption --- BaQD --- carbamazepine --- ferric coordination complex --- photo-Fenton --- turbidity --- cyanide --- activated carbon --- titanium dioxide --- composites --- continuous flow --- adsorption --- catalytic ozonation --- Lewis and Brønsted acid sites --- natural zeolite --- reaction mechanism --- toluene --- three-phase modelling --- fixed-bed reactor --- wastewater treatment --- phenol --- granular activated carbon --- Ad/Ox --- volatile organic compounds --- core–shell structures --- spherical polymer templates --- Co3O4 --- Pd-based promoter --- NOx emission --- metal–organic frameworks --- heterogeneous catalysis --- carbon dioxide --- biomass --- hydrogenation --- oxidation --- Fisher-Tropsch