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This eBook is a collection of articles from a Frontiers Research Topic. Frontiers Research Topics are very popular trademarks of the Frontiers Journals Series: they are collections of at least ten articles, all centered on a particular subject. With their unique mix of varied contributions from Original Research to Review Articles, Frontiers Research Topics unify the most influential researchers, the latest key findings and historical advances in a hot research area! Find out more on how to host your own Frontiers Research Topic or contribute to one as an author by contacting the Frontiers Editorial Office: frontiersin.org/about/contact

Science: general issues --- photocatalysis --- Environmental Remediation --- carbon nitride --- Bi-based photocatalyst --- reaction mechanism --- Heterojunction --- Doping

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The present book is aimed at illustrating the width of applications of metal nanoparticles in catalysis. It covers aspects such as metal nanoparticles preparation using natural biomolecules to the catalytic, photocatalytic and electrocatalytic activity of supported metal nanoparticles. In catalysis, metal nanoparticles exhibit general activity in oxidation and reduction reactions and the book contains examples of both types of processes in which the nanoparticles are on carbon supports or embedded inside the voids of microporous crystalline metal organic frameworks. Metal nanoparticles are also widely used in photocatalysis to enhance light absorption through plasmon band and the efficiency of the photochemical process. Besides classical applications, the use of metal nanoparticles is expanding rapidly in the field of renewable energies, going from catalysts for solid fuels electrodes to novel Li-O2 batteries.

noble metals as catalysts --- TiO2 as photocatalyst --- heterogeneous catalysis --- clusters as catalysts --- metal nanoparticles --- transition metals as catalysts

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This book gathers selected research on the preparation, characterization and application of new organic/inorganic composites endowed with photo(electro)catalytic properties for the photocatalytic production of H2. In these pilot studies, the photoactive materials were tested under either UV-visible or, even more conveniently, under visible light for H2 evolution in “sacrificial water splitting” or “photoreforming” systems. In addition, a review article on the use of 2D materials and composites as potential photocatalysts for water splitting is included.

Technology: general issues --- WO3 --- TiO2 --- hydrogen production --- photoelectrocatalysis --- pancake-like porous carbon nitride --- bottom-up method --- water splitting --- visible light photocatalyst --- photocatalyst --- graphene oxide --- phosphorene --- graphitic carbon nitride --- MOFs --- ethanol reforming --- Au catalyst --- Ti3+ defect --- site-specific deposition --- hydrogen --- catalyst --- photocatalysis --- biomass --- solar light --- perovskite --- carbon nitride --- design of experiments --- n/a

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The book compiles scientific articles describing advances in nanomaterial synthesis and their application in water remediation. The publications treat diverse problems such as dye degradation, heavy metal ion, as well as radioactive element capture and sequestration. There are 10 original research articles and one review article. The latter proposes graphene/CNT and Prussian blue nanocomposites for radioactive 137-cesium extraction from aqueous media. All reports thoroughly characterize the nanomaterials post-synthesis and describe their catalytic, photocatalytic, or ion exchange activities in contaminated water. The dyes studied in the collection are azo dyes, i.e. methylene blue and orange, rhodamine B, phenolic dyes viz. bromophenol blue, and other dyes with sulfonyl groups. Extraction of radioactive elements, including cationic 137Cs+ and anionic 125I?, is also investigated. The omnipresence of ZnO nanoparticles in everyday products and their effects in wastewater are also evaluated. Layered double hydroxide are capable of capturing Ag ions, which then has a catalytic effect on dye degradation. The nanomaterials considered are varied, viz., graphene, CNT, Prussian blue, nanoporous carbon, layered double hydroxides, magnetite, ferrites, organic powders, polymer membranes, bacteria, and inorganic nanomaterials such as MnO and Ag. The book targets an interdisciplinary readership.

LDHs --- magnetic photocatalyst --- n/a --- bioremediation --- membrane --- BiOCl --- BiVO4 --- degradation --- agglomeration --- solvent vapor annealing --- nanoporous carbon --- nanocomposite --- Prussian blue --- stability --- silver nanomaterials --- adsorption --- wastewater --- desalination --- ZnO nanoparticles --- film --- magnetic performance --- metal-organic frameworks --- 137Cs+ selectivity --- nanomixtures --- water remediation --- photocatalytic activity --- adsorption properties --- magnetic extraction --- RGO --- structural regularity --- photocatalytic mechanism --- wastewater treatment --- 137-Cesium --- photocatalyst --- magnetic nanoparticles --- graphene --- radioactive iodine --- carbon nanotubes --- doping modification --- electrospinning --- radioactive contamination --- Mn–Zn ferrite --- mixed wastewater --- manganese oxide --- host–guest interaction --- bromophenol blue --- Dy3+ --- organic pollutants --- dye --- beta-cyclodextrin polymer --- polydopamine --- interaction --- dye removal --- adsorption models --- RhB photodegradation --- hydrothermal method --- supercapacitor --- Mn-Zn ferrite --- host-guest interaction

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In recent years, the formulation of innovative photocatalysts activated by visible or solar light has been attracting increasing attention because of their notable potential for environmental remediation and use in organic synthesis reactions. Generally, the strategies for the development of visible-light-active photocatalysts are mainly focused on enhancing degradation efficiency (in the case of environmental remediation) or increasing selectivity toward the desired product (in the case of organic synthesis). These goals can be achieved by doping the semiconductor lattice with metal and/or non-metal elements in order to reduce band gap energy, thereby providing the semiconductor with the ability to absorb light at a wavelength higher than the UV range. Other interesting options are the formulation of different types of heterojunctions (to increase visible absorption properties and to reduce the recombination rate of charge carriers) and the development of innovative catalytic materials with semiconducting properties. This reprint is focused on visible-light-active photocatalysts for environmental remediation and organic synthesis, featuring the state of the art as well as advances in this field.

Technology: general issues --- History of engineering & technology --- Materials science --- TiO2 --- activated carbon --- nanohybrid --- photodegradation --- azo dyes --- sunlight --- photocatalysis --- visible light --- biomass --- waste --- green chemistry --- nanocatalysis --- nitrobenzene --- Ag/Cu2O --- persulfate --- sulfate radical --- heterostructure --- diamond nanocrystals --- bacterial photoinactivation --- sillenite Bi12NiO19 --- Rietveld method --- optical properties --- BB41 dye --- electrospinning --- carbon composite nanofibers --- water pollution --- Ag3PO4 --- photocatalyst --- C3N4 --- MoS2 --- composite --- photocatalytic oxidation --- Cr(VI) reduction --- cobalt --- decolorization --- Remazol Black --- sulfur --- hydrophosphination --- zirconium --- phosphines --- TiO2 thin film --- oxygen and argon gas flow rates --- acetaminophen --- photocatalytic activity --- response surface method --- Box-Behnken design --- TiO2 --- activated carbon --- nanohybrid --- photodegradation --- azo dyes --- sunlight --- photocatalysis --- visible light --- biomass --- waste --- green chemistry --- nanocatalysis --- nitrobenzene --- Ag/Cu2O --- persulfate --- sulfate radical --- heterostructure --- diamond nanocrystals --- bacterial photoinactivation --- sillenite Bi12NiO19 --- Rietveld method --- optical properties --- BB41 dye --- electrospinning --- carbon composite nanofibers --- water pollution --- Ag3PO4 --- photocatalyst --- C3N4 --- MoS2 --- composite --- photocatalytic oxidation --- Cr(VI) reduction --- cobalt --- decolorization --- Remazol Black --- sulfur --- hydrophosphination --- zirconium --- phosphines --- TiO2 thin film --- oxygen and argon gas flow rates --- acetaminophen --- photocatalytic activity --- response surface method --- Box-Behnken design