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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.

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

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This book represents a collection of contributions in the field of the synthesis and characterization of chemical compounds, natural products, chemical reactivity, and computational chemistry. Among its contents, the reader will find high-quality, peer-reviewed research and review articles that were published in the open access journal Compounds by members of the Editorial Board and the authors invited by the Editorial Office and Editor-in-Chief.

Technology: general issues --- Chemical engineering --- atropisomerism --- 4,4′-bipyridine --- pyridine N-oxidation --- halogenation --- halogen bond --- cyanation --- Finkelstein reaction --- Suzuki coupling --- Orchis --- scent --- gas chromatography --- mass spectrometry --- solid-phase microextraction --- quantum chemistry --- computational chemistry --- molecular dynamics --- modeling --- open-source software --- proprietary software --- Himantoglossum --- solid phase microextraction --- iodination --- alkanes --- alkenes --- alkynes --- alkyl carbonyls --- elemental iodine --- iodides --- Zutano variety --- avocado oil --- Soxhlet extraction --- ultrasound-assisted extraction --- volatiles --- ripening --- over-ripe --- HS-SPME–GC–MS --- Basilicata --- Barlia robertiana --- Himantoglossum robertianum --- mantel test --- Orchidaceae --- pollination syndrome --- Italy --- volatile compounds --- solvolysis --- aryldiazonium ions --- perchlorate anions --- silicon carbide (SiC) --- 3C-SiC powder --- 4H-SiC crystal --- impurities --- photoluminescence --- pnictogen bonding --- nitrogen as pnictogen bond donor --- geometries --- crystal structure analysis --- ICSD and CSD database analyses --- MESP characterizations --- sum of the van der Waals radii concept --- Dactylorhiza --- volatile organic compounds --- thiosemicarbazone --- metal complexes --- DNA interactions --- biological activity --- thiazolidinedione --- microwave synthesis --- compound library --- rosiglitazone --- Knoevangel condensation --- biodiesel production --- crude glycerin --- carbon materials --- n/a --- 4,4'-bipyridine --- HS-SPME-GC-MS

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This book describes unconventional noncovalent interactions and analyzes their importance for crystal growth in organic and hybrid organic–inorganic systems. Several examples illustrate how the combination of theory and experiment allows rationalizing the strength and directionality of noncovalent interactions. This book elegantly describes the results of a survey of X-ray structures of main group element compounds (M = Sn, Pb As, Sb, Bi, and Te) exhibiting intermolecular M•••Se noncovalent interactions in one of its chapters. Moreover, it provides a consistent description of noncovalent interactions, covering most groups of the periodic table. The interactions are described and discussed using their trivial names. That is, a comprehensive and accurate description is provided for alkali, alkaline earth, regium, spodium, triel, tetrel, pnictogen, chalcogen, halogen, and aerogen bonding interactions. No other book is available covering such an extensive number of interactions and examples where these interactions are relevant. relevant.

non-covalent interactions --- regium bonds --- silver(I) --- coinage metals --- pyrazolates --- phosphines --- halogen bonding --- hydrogen bonding sigma-hole interactions --- theoretical studies --- characterizations --- noncovalent interactions --- Lewis acids --- Lewis bases --- spodium bonds --- σ/π-hole interactions --- EDTA --- 2,6-diaminopurine --- cadmium --- co-crystal --- H-bonding --- π–π stacking --- triazinane --- 1,3,5-Triazacyclohexane --- Hirshfeld surface analysis --- DFT study --- C–H···π interaction --- hybridization of a nitrogen atom in sulfonamides --- molecular cocrystal --- sandwiched-layer structure --- C–I···F halogen bonds --- π···π stacking interactions --- PBE0-D3(BJ) calculations --- secondary bonding --- supramolecular --- crystal engineering --- tetrel bonding --- pnictogen bonding --- chalcogen bonding --- selenium --- structural chemistry --- main group elements --- π–hole interaction --- substituent effects --- vibrational spectroscopy --- local vibrational mode theory --- direct measure for π–hole interaction strength --- noncovalent interaction --- hydrogen bonding --- nickel --- Schiff bases --- crystallography --- σ-hole --- π-hole --- crystal growth --- supramolecular chemistry --- σ-hole interactions --- self-assembly --- scanning tunneling microscopy

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Catalysts are widely used in a great variety of technologies, providing remarkable efficiency in order to address sustainable energy production, climate change challenges, and to reduce industrial emissions. In the framework of the Environmental Catalysis section promoted by the Catalysts Editorial Office, this Special Issue, entitled “Environmental Friendly Catalysts for Energy and Pollution Control Applications”, comprises novel studies representing the state-of-the-art research for efficient energy generation and industrial emission control based on new environmentally friendly catalyst materials (EFCs). In particular, in this Special Issue (SI), different kinds of catalysts are presented for catalytic solutions, including the reduction of NOx emissions (new zeolite catalyst modified with Pt), the elimination of volatile organic compounds (Co3O4@SiO2 and acidic surface transformed natural zeolite) and the removal of SO2 emissions (through adsorption processes with sodium citrate). Moreover, novel biocatalysts for bioanodes and new functional nanostructured catalysts based on metal–organic framework (MOFs) for different applications are also included. Additionally, articles compiled in this SI are also focused on the improvement of catalytic processes. Thus, selected processes based on activated carbons (modified with titanium dioxide) and optimized Fenton processes for the removal of aqueous organic pollutants or for the inactivation of bacteria are also presented.

photocatalysis --- organic wastewater --- preparation method --- degradation --- characterizations --- hybridization --- exoelectrogen --- biocatalyst --- microenvironment --- porous electrode --- anaerobic --- recalcitrant compounds --- E. coli K12 --- methylene blue --- optimization --- Pareto chart --- perturbation graph --- Pt-based promoter --- CO oxidation --- environmental catalysis --- refinery compliance --- fluid catalytic cracking --- FCC --- sodium citrate --- sodium humate --- SO2 --- absorption --- BaQD --- carbamazepine --- ferric coordination complex --- photo-Fenton --- turbidity --- cyanide --- activated carbon --- titanium dioxide --- composites --- continuous flow --- adsorption --- catalytic ozonation --- Lewis and Brønsted acid sites --- natural zeolite --- reaction mechanism --- toluene --- three-phase modelling --- fixed-bed reactor --- wastewater treatment --- phenol --- granular activated carbon --- Ad/Ox --- volatile organic compounds --- core–shell structures --- spherical polymer templates --- Co3O4 --- Pd-based promoter --- NOx emission --- metal–organic frameworks --- heterogeneous catalysis --- carbon dioxide --- biomass --- hydrogenation --- oxidation --- Fisher-Tropsch