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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.

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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Pharmaceuticals represent an especially worrying class of micropollutants because they are biologically active. Thus, their occurrence in aquatic environments may cause undesirable effects in living organisms and, if present in water sources for human consumption, may constitute a public health issue. However, wastewater treatment plants (WWTPs), which have not been designed for the removal of pharmaceuticals and cannot guarantee their full elimination, are considered hotspots for their dissemination in natural waters. In this context, the Special Issue (SI) entitled “Removal of Pharmaceuticals from Water: Conventional and Alternative Treatments” was launched to contribute to the assessment of the contemporary challenges and advances in the removal of pharmaceuticals from wastewater. Papers published in the SI, which have been compiled in this book, approached the topic with either of the following different perspectives: (i) the fate and removal of pharmaceuticals by conventional treatments applied in existing WWTPs; or (ii) advanced and alternative green approaches to remove pharmaceuticals from water. Apart from the Editorial, papers published within this SI include two literature reviews and six experimental studies, all of them presenting unconventional approaches, original views, innovative research and/or novel methodologies. This compilation will definitely spark the attention of readers intrigued in the topic, and is useful for researchers in the field.

Technology: general issues --- transportation of pharmaceuticals --- Malaysian aquatic environment --- pharmaceutical consumption --- LC-ToF/MS --- emerging contaminants (ECs) --- sorption --- wastewater treatment --- bioremediation --- algae --- Moringa stenopetala --- water-soluble proteins --- antibiotics removal efficiency --- pharmaceuticals --- water quality --- water treatment --- abatement options --- fungi --- biosorption --- removal of pharmaceuticals --- wastewater --- phyco-remediation --- emerging contaminants --- paracetamol --- Danio rerio --- advanced oxidation processes --- antibiotics --- photolysis --- ozone --- hydrogen peroxide --- Fenton --- heterogeneous photocatalysis --- sonochemical oxidation --- electrooxidation --- transportation of pharmaceuticals --- Malaysian aquatic environment --- pharmaceutical consumption --- LC-ToF/MS --- emerging contaminants (ECs) --- sorption --- wastewater treatment --- bioremediation --- algae --- Moringa stenopetala --- water-soluble proteins --- antibiotics removal efficiency --- pharmaceuticals --- water quality --- water treatment --- abatement options --- fungi --- biosorption --- removal of pharmaceuticals --- wastewater --- phyco-remediation --- emerging contaminants --- paracetamol --- Danio rerio --- advanced oxidation processes --- antibiotics --- photolysis --- ozone --- hydrogen peroxide --- Fenton --- heterogeneous photocatalysis --- sonochemical oxidation --- electrooxidation

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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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The papers selected for publication in the Special Issue “Urban and industrial wastewater disinfection and decontamination by Advanced Oxidation Processes (AOPs): current issues and future trends” and published in this book, include topics related with (waste)water treatment and its reuse, disinfection, and pollutant degradation, advancing the know-how of the topics or assessing their integration into the new age of the circular economy of water. Likewise, aspects such as modeling of degradation processes and new materials synthesis were published, aiming to improve, optimize and predict the efficacy of the existing or the novel treatment processes. Moreover, pilot plant operation and large-scale processes were featured, assessing the feasibility of these new treatment methods in real world applications. Overall, the Special Issue and this book present innovative solutions on the field of water and wastewater treatment, with a view on the future technologies that will form the next advances of the field.

emerging pollutants --- advanced oxidation process --- water pollution --- ultrasound --- flower-like Bi2WO6 --- E.coli inactivation --- reactive oxygen species (ROS) --- photocatalysis --- solar disinfection --- water treatment --- pollution --- circular economy --- wastewater reuse --- zero waste --- zero energy --- substances recovery --- sustainable development goals --- heterogeneous photocatalysis --- titanium dioxide --- tin oxide --- graphene oxide --- chemical oxygen demand --- antibiotics --- wastewater --- removal efficiency --- slurry reactor --- computer-based learning --- solar photocatalysis --- water contaminants --- kinetic modeling --- photoreactor design --- UV-LED --- TiO2 --- hexacyanoferrate --- mining --- hydrothermal method --- elimination routes --- fresh urine --- pharmaceutical degradation --- processes selectivity --- theoretical analysis --- advanced oxidation --- membrane technology --- micropollutants --- biological contaminants --- cytotoxicity --- n/a