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Layered double hydroxides (LDHs), also known as two-dimensional anionic clays, as well as the derived materials, including hybrids, nanocomposites, mixed oxides, and supported metals, have been highlighted as outstanding heterogeneous catalysts with unlimited applications in various processes involving both acid–base (addition, alkylation, acylation, decarboxylation, etc.) and redox (oxidation, reduction, dehydrogenation, etc.) mechanisms. This is mainly due to their flexibility in chemical composition, allowing the fine tuning of the nature of the active sites and the control of the balance between them. Additionally, LDHs display a large anion exchange capacity and the possibility to modify their interlayer space, constraining the size and type of reactants entering in the interlamellar space. Furthermore, their easy and economic synthesis, with high levels of purity and efficiency, at both the laboratory and industrial scales, make LDHs and their derived materials excellent solid catalysts. This Special Issue collects original research papers, reviews, and commentaries focused on the catalytic applications of these remarkable materials.

Research & information: general --- Chemistry --- layered double hydroxides (LDH) --- polyoxometalates (POM) --- catalytic materials --- Michael addition --- cobalt-based LDHs --- ultrasonic irradiation --- synergistic effect --- photocatalysis --- nitrophenol degradation --- Zn,Al-hydrotalcite --- ZnO dispersed on alumina --- reusability --- layered double hydroxide --- LDH --- catalytic oxidation --- ethanol --- toluene --- VOC --- photocatalysts --- Cu electrodes --- diazo dyes --- electrocatalysts --- layer double hydroxides --- photoelectrochemical degradation --- hydrotalcites --- mixed oxides --- aldol condensation --- basic catalysts --- exfoliation --- nanosheets --- oxidation --- layered double hydroxides --- base catalysts --- epoxide --- formaldehyde --- oxidation removal --- BiOCl --- manganese --- biodiesel --- transesterification --- hydrothermal --- nickel --- aluminum --- solid base --- structured catalyst --- ethanol steam reforming --- aluminum lathe waste strips --- Ni nanoparticle --- mechano-chemical/co-precipitation synthesis --- organic alkalis (tetramethylammonium hydroxide) --- memory effect --- Claisen-Schmidt condensation --- self-cyclohexanone condensation --- n/a

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Increases in population, booming economy, rapid urbanization and the rise of living standard have exponentially accelerated waste production. Currently, 2 billion tons per year of municipal solid waste is produced worldwide and about 33% of this amount remains uncollected by different municipalities.. However, the entire waste production process concerns different streams and origins other than municipal solid waste, including industrial, agricultural, construction and demolitions waste; and hazardous, medical and electronic waste. Published papers, as a whole, concern different waste materials such as the recovery of different building materials, the treatment of waste deriving from electrical and electronic equipment, the utilization of stainless-steel slags, agricultural and domestic waste and plastics. In conclusion, the works demonstrate scientific and technological relevance in terms of the topics dealt with, but the problems addressed in this Special Issue proceed beyond the solution that the scientific community is able to propose. In fact, our industrial system, at the end of its cycle of production and consumption, has not developed the capacity to absorb and reuse waste and byproducts. We have not yet managed to adopt a circular model of production capable of preserving resources for present and future generations.

pyrolysis --- biochars --- agricultural waste --- biomass --- recycled aggregates --- self-compacting concrete --- design parameters --- fresh concrete properties --- mix design --- printed circuit boards --- spent mobile phones --- thiourea --- precious metals --- hydrometallurgy --- factorial plans --- plastic waste --- carbon nanotubes --- plastic oil --- fuels --- monomer recovery --- olefins --- reusing of wastes --- secondary lime --- neutralization --- reduce landfill --- acidic wastewater treatment --- sustainable production --- recycling --- lathe waste --- CNC machining --- sustainable development --- mix modification --- workability --- mechanical properties --- thermal properties --- bottom ash --- dry treatment --- incineration --- municipal solid waste --- potential toxic elements --- salts --- sound absorber --- cigarette butts --- sustainable material --- chemical cleaning --- stainless steel slag --- upscale trials --- mixing time --- absorption --- circular economy --- oil spill --- refrigerator --- WEEE --- waste --- value-added materials --- calcium oxide --- eggshell --- incense sticks --- adsorption --- wastewater --- n/a

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Increases in population, booming economy, rapid urbanization and the rise of living standard have exponentially accelerated waste production. Currently, 2 billion tons per year of municipal solid waste is produced worldwide and about 33% of this amount remains uncollected by different municipalities.. However, the entire waste production process concerns different streams and origins other than municipal solid waste, including industrial, agricultural, construction and demolitions waste; and hazardous, medical and electronic waste. Published papers, as a whole, concern different waste materials such as the recovery of different building materials, the treatment of waste deriving from electrical and electronic equipment, the utilization of stainless-steel slags, agricultural and domestic waste and plastics. In conclusion, the works demonstrate scientific and technological relevance in terms of the topics dealt with, but the problems addressed in this Special Issue proceed beyond the solution that the scientific community is able to propose. In fact, our industrial system, at the end of its cycle of production and consumption, has not developed the capacity to absorb and reuse waste and byproducts. We have not yet managed to adopt a circular model of production capable of preserving resources for present and future generations.

Technology: general issues --- pyrolysis --- biochars --- agricultural waste --- biomass --- recycled aggregates --- self-compacting concrete --- design parameters --- fresh concrete properties --- mix design --- printed circuit boards --- spent mobile phones --- thiourea --- precious metals --- hydrometallurgy --- factorial plans --- plastic waste --- carbon nanotubes --- plastic oil --- fuels --- monomer recovery --- olefins --- reusing of wastes --- secondary lime --- neutralization --- reduce landfill --- acidic wastewater treatment --- sustainable production --- recycling --- lathe waste --- CNC machining --- sustainable development --- mix modification --- workability --- mechanical properties --- thermal properties --- bottom ash --- dry treatment --- incineration --- municipal solid waste --- potential toxic elements --- salts --- sound absorber --- cigarette butts --- sustainable material --- chemical cleaning --- stainless steel slag --- upscale trials --- mixing time --- absorption --- circular economy --- oil spill --- refrigerator --- WEEE --- waste --- value-added materials --- calcium oxide --- eggshell --- incense sticks --- adsorption --- wastewater