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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.

Technology: general issues --- 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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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.

Technology: general issues --- 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 --- 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

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The quality of water is not only a technological and scientific issue, but a social and economic problem, in both developed and developing countries. Besides local regulations, which differ between regions and need constant upgrades, significant scientific developments are required in both the detection and removal of water contaminants. This Issue focuses on some recent advancements in the photocatalytic removal of organic pollutants, which is one of the aspects of the problem that involves the need of advanced catalysts and implies significant advancements in the field of materials science and chemical engineering.

History of engineering & technology --- indigo carmine --- resin --- Dielectric Barrier Discharge --- adsorption --- regeneration --- anatase/brookite biphasic --- nitrogen-doping --- sol-gel method --- visible light photocatalysis --- degradation of dyes --- polyaniline --- titanium dioxide --- copper(II) oxide --- cobalt oxide(II,III) --- photocatalytic fuel cell --- graphitic carbon nitride --- Fe doping --- Z-scheme --- strontium aluminates --- dye photodecomposition --- hydrothermal reaction --- sol–gel method --- phosphorescence --- photocatalytic decomposition of rhodamine B --- MIL-53(Fe) --- Ni/Fe-MOF --- visible light irradiation --- n/a

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Heterogeneous catalysis played, plays, and will continue to play, a major key role in industrial processes for large-scale synthesis of commodity chemicals of global importance, and in catalytic systems that possess a critical role in energy generation and environmental protection approaches. As a result of the ongoing progress in materials science, nanotechnology, and characterizations, great advances have been achieved in heterogeneous catalysis by nanomaterials. Efficient approaches and advanced methods for the design of nano-structured composite materials (up to atomic level), subject to specific nano-morphologies with enhanced metal–metal and metal–support interactions favorable for catalysis (that enable fine-tuning of the critical properties of the designed catalysts), provide optimized catalysts with outstanding performances in numerous eco-friendly and cost-effective applications. Accordingly, great progress has been achieved involving, for example, emissions control, waste treatment, photocatalytic, bio-refinery, CO2 utilization, and fuel cells applications, as well as hydrocarbon processing for H2, added-value chemicals, and liquid fuels production. The themed Special Issue has succeeded in collecting 10 high-quality contributions that cover recent research progress in the field for a variety of applications (e.g., environment, energy, added-value chemicals/organics synthesis, and bio-transformation) declaring the prospect and importance of nanomaterials in all the directions of heterogeneous catalysis.

n/a --- B-doped --- polyoxymethylene dimethyl ethers --- porous carbon --- self-catalytic pyrolysis --- visible light --- heterostructure --- oxygen vacancies --- TiO2 nanotube --- thiadiazoles --- ethylidenethiosemicarbazides --- adsorption --- dimethoxymethane --- nano-biocatalyst --- heterogeneous catalysis --- bio-catalysis --- H2 evolution --- carbon cuboids --- trioxymethylene --- ?-glucosidase --- metal-organic frameworks --- Brønsted acid sites --- hybrid --- MXene --- oleuropein --- Rhodamine B --- antibiotics --- maleic anhydride --- oxygen evolution reaction --- photocatalyst --- 2-methyl-3-butennitrile --- halide perovskite --- zeolites --- electrospinning --- Rh --- Ti3C2Tx --- heterostructures --- hydroxytyrosol --- metal–organic frameworks --- photocatalysis --- Ni/ZrO2 --- the maximum included sphere --- functionalized olefin --- selective hydrogenation --- thiazoles --- oxidation --- visible-light --- red P --- chitosan-MgO nanocomposite --- ZnO --- g-C3N4/TiO2 --- hydroformylation --- steric constraint

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Water is indispensable to the functioning of most known life forms, and good water quality is essential to human health, social and economic development, and ecosystem functioning. Nonetheless, population growth has been leading to the degradation and depletion of fresh water resources. Under these circumstances, ensuring sufficient and safe water supplies for everyone is one of the Sustainable Development Goals (SDGs) set by the United Nations General Assembly in 2015 for the year 2030. For this goal to be achieved, the development and implementation of appropriate and efficient wastewater treatments that allow us to reduce water pollution is a major challenge.In view of the relevant contribution that polymers and polymeric materials may have in the conservation of the aquatic environment, namely by their application in wastewater treatment, original research and review papers on “Current trends and perspectives in the application of polymeric materials for wastewater treatment” were here brought together. For sure, this set of papers will be helpful and inspiring for readers interested in this topic.

Technology: general issues --- waste silk --- dopamine --- iron particles --- wastewater treatment --- activated carbon microsphere --- sodium lignosulfonate --- Cr(VI) --- adsorption --- modified polymeric resin --- t-butyl phosphate impregnation --- polymer based adsorbents --- dye adsorption --- response surface methodology --- nano-MgO --- structural modification --- permeability --- antifouling --- color rejection --- POME --- fluoroquinolones --- ultrasound radiation --- mesoporous carbon --- desirability function --- thermodynamics --- wastewater --- cost analysis --- ciprofloxacin --- Polystyrene nanocomposite --- modifications --- characterizations --- antibiotics --- emerging contaminants --- pharmaceuticals --- polymeric adsorbents --- magnetization --- silver nanoparticles --- microfiltration --- membranes --- biofouling --- sputtering --- magnetite --- co-precipitation method --- Rhodamine B --- sodium dodecyl sulfate --- selective adsorption --- dysprosium --- neodymium --- fabric adsorbent --- radiation --- graft polymerization --- molecular imprinting --- polymer --- sertraline --- cross-reactivity --- SSRI --- template --- sorbent --- n/a