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Energy crises and global warming pose serious challenges to researchers in their attempt to develop a sustainable society for the future. Solar energy conversion is a remarkable, clean, and sustainable way to nullify the effects of fossil fuels. The findings of photocatalytic hydrogen production (PCHP) by Fujishima and Honda propose that “water will be the coal for the future”. Hydrogen is a carbon-free clean fuel with a high specific energy of combustion. Titanium oxide (TiO2), graphitic-carbon nitride (g-C3N4) and cadmium sulfide (CdS) are three pillars of water splitting photocatalysts owing to their superior electronic and optical properties. Tremendous research efforts have been made in recent years to fabricate visible or solar-light, active photocatalysts. The significant features of various oxide, sulfide, and carbon based photocatalysts for cost-effective hydrogen production are presented in this Special Issue. The insights of sacrificial agents on the hydrogen production efficiency of catalysts are also presented in this issue.

Technology: general issues --- photocatalysis --- H2 generation --- water splitting --- solar energy --- hydrogen production --- methanol photo-splitting --- heterojunction --- CuS@CuGaS2 --- electron-hole recombination --- perovskite oxynitride --- band gap --- density-functional theory --- Niobium(V) oxide --- graphitic carbon nitride --- hydrothermal synthesis --- H2 evolution --- heterostructures --- Z-Scheme --- TiO2 --- g-C3N4 --- CdS --- energy --- spherical particle --- disordered surface --- photocatalysts --- MoS2 --- MoSe2 --- photoelectrochemical deposition --- rapid-thermal annealing --- hydrogen evolution --- CO2 reduction --- n/a

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Energy crises and global warming pose serious challenges to researchers in their attempt to develop a sustainable society for the future. Solar energy conversion is a remarkable, clean, and sustainable way to nullify the effects of fossil fuels. The findings of photocatalytic hydrogen production (PCHP) by Fujishima and Honda propose that “water will be the coal for the future”. Hydrogen is a carbon-free clean fuel with a high specific energy of combustion. Titanium oxide (TiO2), graphitic-carbon nitride (g-C3N4) and cadmium sulfide (CdS) are three pillars of water splitting photocatalysts owing to their superior electronic and optical properties. Tremendous research efforts have been made in recent years to fabricate visible or solar-light, active photocatalysts. The significant features of various oxide, sulfide, and carbon based photocatalysts for cost-effective hydrogen production are presented in this Special Issue. The insights of sacrificial agents on the hydrogen production efficiency of catalysts are also presented in this issue.

Technology: general issues --- photocatalysis --- H2 generation --- water splitting --- solar energy --- hydrogen production --- methanol photo-splitting --- heterojunction --- CuS@CuGaS2 --- electron-hole recombination --- perovskite oxynitride --- band gap --- density-functional theory --- Niobium(V) oxide --- graphitic carbon nitride --- hydrothermal synthesis --- H2 evolution --- heterostructures --- Z-Scheme --- TiO2 --- g-C3N4 --- CdS --- energy --- spherical particle --- disordered surface --- photocatalysts --- MoS2 --- MoSe2 --- photoelectrochemical deposition --- rapid-thermal annealing --- hydrogen evolution --- CO2 reduction

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Photoactive nanomaterials have been receiving increasing attention due to their potential application in the light-driven degradation of water and gas-phase pollutants. However, to exploit the great potential of photoactive materials and access their properties requires fine-tuning of their size/shape-dependent chemical–physical properties, and on the ability to integrate them in photoreactors or to deposit them onto large surfaces. Therefore, the synthetic approach as well as post-synthesis manipulation could strongly affect the final photocatalytic properties of the nanomaterial. The aim of the present Special Issue is to report on the most recent progress towards the application of photoactive nanomaterials and nanomaterial-based coatings in pollutant degradation, paying particular attention to cases close to real application: scalable synthetic approaches to nanocatalysts, preparation of nanocatalyst-based coatings, degradation of real pollutants and bacterial inactivation, and application in building materials.

toxicity --- polar herbicide --- composite nanorods --- heterojunction --- degradation --- nanocomposites --- nanoparticles --- polyester --- TiO2 nanotube --- environmental remediation --- building materials --- hydroxyapatite --- VOCs --- reactive green 12 --- Pt loaded TiO2 --- nanomaterials --- expansion --- photocatalytic activity --- CuxO/TiO2 --- water remediation --- antimicrobial properties --- sputtering --- diclofenac --- mesoporous --- TiO2 --- advanced oxidation processes --- mortar --- disinfection --- HiPIMS --- microcracks --- Cu2O --- sulfate attack --- NOx --- photocatalysis --- blast furnace slag --- paraquat --- recalcitrant pollutants --- shell thickness --- water treatments --- visible light LEDs --- cement --- deterioration --- transformation products --- gas-phase pollutants --- titanium dioxide --- photoelectrocatalysis --- Z-scheme

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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.

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