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Very few materials have attracted so much attention in recent years, both from researchers and industry, as layered double hydroxides (LDHs) have. LDHs, which are also referred to as anionic clays or hydrotalcites, are a wide class of inorganic ionic lamellar clay materials consisting of alternately stacked positively charged metal hydroxide layers with intercalated charge-balancing anions in hydrated interlayer regions. Their unique properties, such as their extremely high versatility in chemical composition and intercalation ability, extraordinary tuneability in composition as well as morphology, good biocompatibility and high anion exchangeability, have triggered immense interdisciplinary interest for their use in many different fields of chemistry, biology, medicine, and physics. Indeed, the applications of LDHs are constantly growing: LDHs, in the form of aggregated lamellar clusters, exfoliated single-layer nanosheets, or hierarchical films of interconnected nanoplatelets, can be effectively used as nanoscale vehicles in drug delivery, heterogeneous catalysts and supports for molecular catalysts, ion exchangers and adsorbents, solid electrolytes or fillers in electrochemistry, for the fabrication of superhydrophobic surfaces, water treatment and purification, and the synthesis of functional thin films. This book gathers the contributions to the Special Issue “Layered Double Hydroxides” of Crystals, which includes two review articles and seven research papers.

Research & information: general --- layered double hydroxide --- memory effect --- rare earth --- europium --- 1,3,5-benzenetricarboxylic acid --- alginate beads --- green sorbent --- selective adsorption --- heavy metals --- tetracycline --- metal hydroxides --- layered double hydroxides --- removal --- water sample --- Bacillus subtilis --- surfactin --- quantitative analysis --- fermentation --- growth phase --- cellular biology --- catalysis --- DNA --- drug delivery --- hydrotalcite --- osteogenesis --- photocatalysis --- RNA. --- antimonate uptake --- mine water --- brandholzite --- zincalstibite --- iron precursor --- acidic residual solution --- LDH synthesis --- Mo(VI) adsorption --- resveratrol --- solid lipid nanoparticles --- endurance exercise --- mitochondrial nutrients --- mitochondrial quality control --- origin of life --- layer double hydroxide --- synthetic biology --- bioinspired devices --- biosensors --- bioanalysis --- n/a

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Very few materials have attracted so much attention in recent years, both from researchers and industry, as layered double hydroxides (LDHs) have. LDHs, which are also referred to as anionic clays or hydrotalcites, are a wide class of inorganic ionic lamellar clay materials consisting of alternately stacked positively charged metal hydroxide layers with intercalated charge-balancing anions in hydrated interlayer regions. Their unique properties, such as their extremely high versatility in chemical composition and intercalation ability, extraordinary tuneability in composition as well as morphology, good biocompatibility and high anion exchangeability, have triggered immense interdisciplinary interest for their use in many different fields of chemistry, biology, medicine, and physics. Indeed, the applications of LDHs are constantly growing: LDHs, in the form of aggregated lamellar clusters, exfoliated single-layer nanosheets, or hierarchical films of interconnected nanoplatelets, can be effectively used as nanoscale vehicles in drug delivery, heterogeneous catalysts and supports for molecular catalysts, ion exchangers and adsorbents, solid electrolytes or fillers in electrochemistry, for the fabrication of superhydrophobic surfaces, water treatment and purification, and the synthesis of functional thin films. This book gathers the contributions to the Special Issue “Layered Double Hydroxides” of Crystals, which includes two review articles and seven research papers.

Research & information: general --- layered double hydroxide --- memory effect --- rare earth --- europium --- 1,3,5-benzenetricarboxylic acid --- alginate beads --- green sorbent --- selective adsorption --- heavy metals --- tetracycline --- metal hydroxides --- layered double hydroxides --- removal --- water sample --- Bacillus subtilis --- surfactin --- quantitative analysis --- fermentation --- growth phase --- cellular biology --- catalysis --- DNA --- drug delivery --- hydrotalcite --- osteogenesis --- photocatalysis --- RNA. --- antimonate uptake --- mine water --- brandholzite --- zincalstibite --- iron precursor --- acidic residual solution --- LDH synthesis --- Mo(VI) adsorption --- resveratrol --- solid lipid nanoparticles --- endurance exercise --- mitochondrial nutrients --- mitochondrial quality control --- origin of life --- layer double hydroxide --- synthetic biology --- bioinspired devices --- biosensors --- bioanalysis

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The progress of society has led to an improvement of the quality of life of a significant number of people. On the other hand, anthropogenic pollution dramatically increased, with serious consequences for the environment and human health. Controlling and remedying environmental pollution is one of the main challenges of our century. Fundamental and applicative research are called to collaborate, involving scientists in the development of realistic and effective systems for the prevention and the removal of pollutants from the environment. Spreading knowledge is among the missions of researchers and this is the aim of this book, offering an updated view on innovative materials and methods for pollutant treatment. It is composed of 18 articles, among them 5 reviews and 13 original articles, dedicated to new adsorbent materials (inorganic, organic, and hybrid materials) for the capture of pollutant species and for their catalytic conversion into non-toxic substances, and to bioremediation approaches to treat contaminated media. Water, air, and soil pollution was investigated, both at the lab and large scale, with special relevance for wastewater treatments for the removal of heavy metals and organic pollutants. We are grateful to “Molecules” for the opportunity to edit the Special Issue on “Innovative Materials and Methods for the Removal of Pollutants from the Environment”. We created, for this book, an original cover image, dedicated to the efforts of chemistry to defend the beauty of environment, represented by flowers, against every prejudice that considers chemistry an enemy of life.

Research & information: general --- Environmental economics --- Pollution control --- green-removal --- tangerine peels activated carbon --- agriculture waste --- acetamiprid pesticide --- enzymatic hydrolysis lignin --- sequential dissolution fractionation --- methylene blue adsorption capacity --- CuFe2O4 nano-particles --- CuFe2O4/PANI composite --- mercury (II) removal --- adsorption --- biochar --- pyrolysis --- heavy metals --- soil remediation --- bioavailability --- biomass waste --- N doped carbon dots --- Cd (II) --- mechanism --- water remedy --- green adsorbents --- pineapple leaves --- rose bengal (RB) dye --- face-centered central composite design (FCCCD), percentage removal (%R) --- adsorption capacity (qe) --- phosphorus removal --- toxic metals --- alginate beads --- sewage sludge --- BC --- sequential extraction --- copper --- carbon-silicon interaction --- bioremediation --- toxic pollutants --- extreme conditions --- extremophilic microorganism --- non-thermal plasma (NTP) --- exhaust emission --- internal combustion engine --- ion chemical reaction --- insensitive munitions --- 3-nitro-1,2,4-triazol-5-one (NTO) --- industrial wastewater --- vetiver grass --- phytoremediation --- phytoextraction --- ammonia --- ammonium recovery --- Freundlich --- intraparticle diffusion --- isoelectric state --- Langmuir --- pseudo-second-order --- Temkin --- zeolite --- high-strength wastewater --- sludge liquor --- chitosan --- adsorbent --- carbon --- graphene oxide --- silica --- magnetic separation --- dyes --- Langmuir isotherm --- breakthrough curve --- defluoridation --- up-flow mode --- volcanic rocks --- toluene --- rhodamine B --- water stability of monolith --- nanosorbent --- regeneration --- α-NiMoO4 --- methylene blue --- removal --- zirconium phosphate --- wastewater pollutants --- ion exchange --- heterogeneous photocatalysis --- nanomaterials --- rare earth metals --- wastewater treatment --- pollutants