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This reprint focuses on new trends in photo-electrocatalysis, specifically addressed to the remediation of wastewater and energy production. The remediation of wastewater, up to a level that is acceptable for discharge into receiving waterbodies, involves an ever-growing demand of energy, so effective and low-energy treatment processes are highly desirable. Among the other treatments, photo- and photo-electrochemical treatment processes may be considered as advanced oxidation processes (AOP), which are based on the generation of OH radicals, strong oxidizing agents able to indiscriminately degrade even the most persistent organic compounds. Photocatalysis and photo-electrocatalysis can be considered as effective methods for organic degradation, especially when the semiconductor is active in the range of visible light. Several results are presented on new morphologies and structures, which allow more photoactive, visibly responsive, and stable materials, as well as studies on combined processes in which photo- or photo-electrochemistry contribute to an increase in the sustainability of the whole process, lowering costs and achieving the most valuable final products. In view of the circular economy concept, microbial fuel cell systems are also considered as possible way to recover energy from organic pollutants contained in wastewater.

composite --- polymethylmethacrylate --- photocatalytic oxidation --- titanium dioxide --- tetracycline --- ethanol --- photocatalysis --- silver(II) oxide --- mechanical mixture --- in situ deposition --- hydrogen evolution --- Anodic oxidation --- diamond electrodes --- UV irradiation --- ultrasounds --- amoxicillin --- ampicillin --- Composite catalysts --- synergy effect --- solar energy --- wastewater remediation --- photoelectrocatalysis --- TiO2 nanostructures --- Au nanoparticles --- water splitting --- bisphenol A oxidation --- ZnFe2O4 --- degree of inversion --- cation distribution --- photoelectrochemical activity --- porous nickel --- selective corrosion --- hydrogen evolution reaction --- metal sulfides --- H2 production --- photocatalyst --- facet effect --- light trapping --- crystal size --- non-precious metal catalysts --- Cu–B alloy --- microbial fuel cell --- cathode --- environmental engineering --- oxygen electrode --- renewable energy sources --- graphitic carbon nitride --- H2 generation --- Ni–Co catalyst --- electricity production --- advanced oxidation processes --- azo dye --- sustainable resources --- niobium --- water reuse --- water treatment --- AOPs --- zinc oxide --- nanoclusters --- UVA --- visible light --- photocatalytic reduction --- CO2 --- TiO2 photocatalysts --- surface modification --- solar fuel --- magnetron sputtering --- titanium dioxide (TiO2) film --- photocatalytic activity --- metal and non-metal doping --- optical properties --- n/a --- Cu-B alloy --- Ni-Co catalyst

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The semiconductor titanium dioxide (TiO2) has been evolved as a prototypical material to understand the photocatalytic process, and has been demonstrated for various photocatalytic applications such as pollutants degradation, water splitting, heavy metal reduction, CO2 conversion, N2 fixation, bacterial disinfection, etc. Rigorous photocatalytic studies on TiO2 have paved the way to understanding the various chemical processes involved and the physical parameters (optical and electrical) required to design and construct diverse photocatalytic systems. Accordingly, it has been realized that an effective photocatalyst should have ideal band edge potential, narrow band gap energy, reduced charge recombination, enhanced charge separation, improved interfacial charge transfer, surface-rich catalytic sites, etc. As a result, many strategies have been developed to design a variety of photocatalytic systems, which include doping, composite formation, sensitization, co-catalyst loading, etc. Towards highlighting the above-mentioned diversities in TiO2 photocatalysis, there have been many interesting original research works on TiO2, involving material designs for various photocatalytic applications published in this Special Issue. In addition, some excellent review papers have also been published in this Special Issue, focusing on the various TiO2-based photocatalytic systems and their mechanisms and applications.

Research & information: general --- modified L-H model --- N-TiO2 --- photocatalytic degradation --- benzene --- antibacterial --- copper oxide --- photocatalyst --- titanium dioxide --- thin film --- visible light --- photovoltaic conversion --- interfacial charge-transfer transition --- 7,7,8,8-tetracyanoquinodimethane --- Nb-doped TiO2 --- N-doped graphene quantum dots --- TiO2 --- photocatalytic performance --- pyridinic N --- graphitic N --- solid-phase photocatalytic degradation --- polyvinyl borate --- decahedral-shaped anatase titania particles --- {001} and {101} facets --- facet-selective metal photodeposition --- pH dependence --- zeta potential --- facet-selective reaction --- photocatalysis --- deNOxing --- Titania --- photophysics --- metal oxides --- environment --- 2D materials --- composite --- iron-doped TiO2 --- photocatalytic activity --- low UV irradiation --- hydroxyl radical --- estriol --- W-Mo dopants --- nanoparticles --- non-metal- doped TiO2 --- nitroaromatic compounds --- reduction --- selectivity --- Titanium dioxide --- bismuth molybdate --- lignin --- UV light --- Photo-CREC Water II reactor --- Palladium --- Hydrogen production --- Quantum Yield --- magnetic property --- reusable --- photoreduction --- microporous material --- adsorption --- air purification --- porous glass --- mesocrystals --- synthesis --- modification --- Ru-Ti oxide catalysts --- HCl oxidation --- oxygen species --- Ce incorporation --- active phase-support interactions --- bleached wood support materials --- 3D photocatalyst --- UV transmittance --- floatable --- recyclable --- TiO2C composite --- acid catalyst --- dehydration --- fructose --- 5-Hydroxymethylfurfural --- Microcystis aeruginosa --- microcystin --- controlled periodic illumination --- advanced oxidation process --- hexabromocyclododecane --- environmental management --- advanced oxidation processes --- energy band engineering --- morphology modification --- applications --- Titanium dioxide (TiO2) --- visible-light-sensitive photocatalyst --- N-doped TiO2 --- plasmonic Au NPs --- interfacial surface complex (ISC) --- selective oxidation --- decomposition of VOC --- carbon nitride (C3N4) --- alkoxide --- ligand to metal charge transfer (LMCT) --- hydrogen production --- TiO2-HKUST-1 composites --- solar light --- electron transfer --- graphene quantum dots --- heterojunction --- process optimization --- response surface methodology --- kinetic study --- Advanced oxidation processes (AOPs) --- TiO2 catalyst --- textile wastewater --- oxygen vacancy --- polymeric composites --- photoelectrochemistry --- co-modification --- solar energy conversion --- p-n heterojunction --- g-C3N4 --- charge separation --- semiconductors --- redox reactions --- band gap engineering --- nanostructures --- n/a --- in-situ formation --- anatase nanoparticles --- H-titanate nanotubes --- dual-phase --- low temperature

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• Reference Manager
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The semiconductor titanium dioxide (TiO2) has been evolved as a prototypical material to understand the photocatalytic process, and has been demonstrated for various photocatalytic applications such as pollutants degradation, water splitting, heavy metal reduction, CO2 conversion, N2 fixation, bacterial disinfection, etc. Rigorous photocatalytic studies on TiO2 have paved the way to understanding the various chemical processes involved and the physical parameters (optical and electrical) required to design and construct diverse photocatalytic systems. Accordingly, it has been realized that an effective photocatalyst should have ideal band edge potential, narrow band gap energy, reduced charge recombination, enhanced charge separation, improved interfacial charge transfer, surface-rich catalytic sites, etc. As a result, many strategies have been developed to design a variety of photocatalytic systems, which include doping, composite formation, sensitization, co-catalyst loading, etc. Towards highlighting the above-mentioned diversities in TiO2 photocatalysis, there have been many interesting original research works on TiO2, involving material designs for various photocatalytic applications published in this Special Issue. In addition, some excellent review papers have also been published in this Special Issue, focusing on the various TiO2-based photocatalytic systems and their mechanisms and applications.

Research & information: general --- modified L-H model --- N-TiO2 --- photocatalytic degradation --- benzene --- antibacterial --- copper oxide --- photocatalyst --- titanium dioxide --- thin film --- visible light --- photovoltaic conversion --- interfacial charge-transfer transition --- 7,7,8,8-tetracyanoquinodimethane --- Nb-doped TiO2 --- N-doped graphene quantum dots --- TiO2 --- photocatalytic performance --- pyridinic N --- graphitic N --- solid-phase photocatalytic degradation --- polyvinyl borate --- decahedral-shaped anatase titania particles --- {001} and {101} facets --- facet-selective metal photodeposition --- pH dependence --- zeta potential --- facet-selective reaction --- photocatalysis --- deNOxing --- Titania --- photophysics --- metal oxides --- environment --- 2D materials --- composite --- iron-doped TiO2 --- photocatalytic activity --- low UV irradiation --- hydroxyl radical --- estriol --- W-Mo dopants --- nanoparticles --- non-metal- doped TiO2 --- nitroaromatic compounds --- reduction --- selectivity --- Titanium dioxide --- bismuth molybdate --- lignin --- UV light --- Photo-CREC Water II reactor --- Palladium --- Hydrogen production --- Quantum Yield --- magnetic property --- reusable --- photoreduction --- microporous material --- adsorption --- air purification --- porous glass --- mesocrystals --- synthesis --- modification --- Ru-Ti oxide catalysts --- HCl oxidation --- oxygen species --- Ce incorporation --- active phase-support interactions --- bleached wood support materials --- 3D photocatalyst --- UV transmittance --- floatable --- recyclable --- TiO2C composite --- acid catalyst --- dehydration --- fructose --- 5-Hydroxymethylfurfural --- Microcystis aeruginosa --- microcystin --- controlled periodic illumination --- advanced oxidation process --- hexabromocyclododecane --- environmental management --- advanced oxidation processes --- energy band engineering --- morphology modification --- applications --- Titanium dioxide (TiO2) --- visible-light-sensitive photocatalyst --- N-doped TiO2 --- plasmonic Au NPs --- interfacial surface complex (ISC) --- selective oxidation --- decomposition of VOC --- carbon nitride (C3N4) --- alkoxide --- ligand to metal charge transfer (LMCT) --- hydrogen production --- TiO2-HKUST-1 composites --- solar light --- electron transfer --- graphene quantum dots --- heterojunction --- process optimization --- response surface methodology --- kinetic study --- Advanced oxidation processes (AOPs) --- TiO2 catalyst --- textile wastewater --- oxygen vacancy --- polymeric composites --- photoelectrochemistry --- co-modification --- solar energy conversion --- p-n heterojunction --- g-C3N4 --- charge separation --- semiconductors --- redox reactions --- band gap engineering --- nanostructures --- in-situ formation --- anatase nanoparticles --- H-titanate nanotubes --- dual-phase --- low temperature