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This Special Issue, focusing on the value of mineralogical monitoring for the mining and minerals industry, should include detailed investigations and characterizations of minerals and ores of the following fields for ore and process control: Lithium ores—determination of lithium contents by XRD methods; Copper ores and their different mineralogy; Nickel lateritic ores; Iron ores and sinter; Bauxite and bauxite overburden; Heavy mineral sands. The value of quantitative mineralogical analysis, mainly by XRD methods, combined with other techniques for the evaluation of typical metal ores and other important minerals, will be shown and demonstrated for different minerals. The different steps of mineral processing and metal contents bound to different minerals will be included. Additionally, some processing steps, mineral enrichments, and optimization of mineral determinations using XRD will be demonstrated. Statistical methods for the treatment of a large set of XRD patterns of ores and mineral concentrates, as well as their value for the characterization of mineral concentrates and ores, will be demonstrated. Determinations of metal concentrations in minerals by different methods will be included, as well as the direct prediction of process parameters from raw XRD data.

Technology: general issues --- History of engineering & technology --- Mining technology & engineering --- barite --- mineralogy --- industrial application --- beneficiation --- specific gravity --- bauxite overburden --- Belterra Clay --- mineralogical quantification --- Rietveld analysis --- machine learning --- artificial intelligence --- mining --- mineralogical analysis --- bauxite --- available alumina --- reactive silica --- XRD --- PLSR --- lithium --- quantification --- clustering --- Rietveld --- cluster analysis --- spodumene --- petalite --- lepidolite --- triphylite --- zinnwaldite --- amblygonite --- chalcopyrite --- ore blending --- copper flotation --- nickel laterite --- ore sorting --- framboidal pyrite --- sulfide minerals --- flotation --- process mineralogy --- heavy minerals --- ilmenite --- titania slag --- rietveld --- Magneli phases --- n/a

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This Special Issue, focusing on the value of mineralogical monitoring for the mining and minerals industry, should include detailed investigations and characterizations of minerals and ores of the following fields for ore and process control: Lithium ores—determination of lithium contents by XRD methods; Copper ores and their different mineralogy; Nickel lateritic ores; Iron ores and sinter; Bauxite and bauxite overburden; Heavy mineral sands. The value of quantitative mineralogical analysis, mainly by XRD methods, combined with other techniques for the evaluation of typical metal ores and other important minerals, will be shown and demonstrated for different minerals. The different steps of mineral processing and metal contents bound to different minerals will be included. Additionally, some processing steps, mineral enrichments, and optimization of mineral determinations using XRD will be demonstrated. Statistical methods for the treatment of a large set of XRD patterns of ores and mineral concentrates, as well as their value for the characterization of mineral concentrates and ores, will be demonstrated. Determinations of metal concentrations in minerals by different methods will be included, as well as the direct prediction of process parameters from raw XRD data.

Technology: general issues --- History of engineering & technology --- Mining technology & engineering --- barite --- mineralogy --- industrial application --- beneficiation --- specific gravity --- bauxite overburden --- Belterra Clay --- mineralogical quantification --- Rietveld analysis --- machine learning --- artificial intelligence --- mining --- mineralogical analysis --- bauxite --- available alumina --- reactive silica --- XRD --- PLSR --- lithium --- quantification --- clustering --- Rietveld --- cluster analysis --- spodumene --- petalite --- lepidolite --- triphylite --- zinnwaldite --- amblygonite --- chalcopyrite --- ore blending --- copper flotation --- nickel laterite --- ore sorting --- framboidal pyrite --- sulfide minerals --- flotation --- process mineralogy --- heavy minerals --- ilmenite --- titania slag --- rietveld --- Magneli phases

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Since the first works introducing the aluminum intercalated clay family in the early 1970s, interest in the synthesis of Pillared InterLayered Clays (PILC) has increased tremendously, especially research into their properties and energetic and environmental applications. After our comprehensive reviews and book on the synthesis and catalytic applications of these materials, new references have appeared in the literature and the interest in this field is continuously increasing. The aim of this Special Issue is to collect the recent advances developed considering this family of solids.

clays --- Al-PILC --- pillared clays --- scale up --- pillaring solution --- Keggin ion --- reutilization --- Keggin polycation --- concentrated media --- microwave radiation --- pillared montmorillonite --- AlNi-PILC --- Pd-Ce --- catalytic combustion --- benzene --- TPD/TPSR --- ZnO-TiO2/delaminated montmorillonite --- heterostructures --- Ag-coating --- solar photocatalytic activity --- water purification --- cadmium --- chitosan --- modification --- 13X molecular sieve --- removal --- dye remediation --- adsorption --- azo dye --- wastewater --- pillared porous phosphate heterostructures --- isotherm --- sericite --- thermal modification --- acid activation --- sodium modification --- montmorillonite/hydrotalcite composite --- montmorillonite/titania composite --- organoclay --- inverse micelle --- Mn-Al mixed oxide --- combustion catalysts --- ciprofloxacin --- smectite --- pillared clay --- keggin-like mixed Al/Fe polyoxocation --- mineralogical composition --- catalytic wet peroxide oxidation --- mesosilica --- methyl orange --- palygorskite

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Functional chitosan-based composites provide recent advances in the field. This reprint explores the preparation and characterization of nanocomposite films, membranes, hydrogels and nanoparticles, emphasizing their potential application as medical devices, packaging, or fuel cells. It will be a useful resource for academic and industry scientists.

Technology: general issues --- chitosan-grafted-polyacrylamide --- thermo-thickening --- rheological --- dynamic light scattering --- cryo-electron microscope --- chitosan --- sulfated titania --- cross-linking --- polyelectrolyte composite membranes --- gene delivery --- gene overexpression --- gene silencing --- fish biotechnology --- cellulose --- collagen --- biomaterials --- tannins --- lipoic acid --- Quercus robur L. --- multifunctional materials --- multifractal theoretical model --- carboxymethyl chitosan --- molecular weight --- antioxidant properties --- skin moisturizing --- superabsorbent hydrogel --- N-citraconyl-chitosan --- poly(acrylic acid)/poly(methacrylic acid) --- maghemite --- optical --- mercury ion --- surface plasmon resonance --- cellulose nanofibrils --- oregano essential oil --- antimicrobial --- oxygen barrier properties --- hydrophobically modified-chitosan nanoparticle --- protocatechuic acid --- nanobiotechnology --- zinc oxide nanoparticles --- interfacial layer --- dielectric spectroscopy

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This reprint is a compilation of the articles submitted in the Special Issue entitled, “Heterogeneous Photocatalysis: A Solution for a Greener Earth”, from the journal Catalysts, which presents an overview of the latest advances in the development of innovative photocatalytic processes.

Technology: general issues --- History of engineering & technology --- Environmental science, engineering & technology --- Ce-modified ZnO --- electron microscopy --- methylene blue (MB) degradation --- photoluminescence --- photocatalysis --- TiO2 --- sol–gel process --- SiO2 --- Pd-modification --- activation treatments --- CNS-doped TiO2 --- NaYF4:Yb,Er --- upconversion phosphor --- UV-Vis–NIR photocatalysis --- NiTiO3 --- g-C3N4 --- composite photocatalyst --- recombination --- photodegradation --- charge separation efficiency --- coagulation --- landfill leachate --- reverse osmosis concentrate --- photo-Fenton --- LED --- lime precipitation --- ambient crystallization --- Zr/N doping --- titania --- aqueous sol-gel process --- p-nitrophenol degradation --- maprotiline --- advanced oxidation processes --- LC/HRMS coupling --- structural elucidation --- kinetics --- ecotoxicity estimations --- 6-mercaptopurine photodegradation --- wastewater --- cytostatic --- emerging pollutants --- sol–gel synthesis --- peptization --- doping --- pollutant degradation --- mild temperature --- tri-doped TiO2 --- thiacloprid --- water treatment --- nano-Ag–TiO2 nanostructured nanofibers --- electrospinning --- UV-visible light assisted photocatalytic activity --- photodegradation kinetics --- antimicrobial activity --- nanoparticles --- semi-pilot plant --- fabric --- green synthesis --- nickel oxide --- oxygen evolution reaction --- electrocatalysts --- mesoporous titania --- glass fiber --- contaminants of emerging concern --- high resolution mass spectrometry --- transformation products --- ligand-to-metal charge transfer --- anatase --- oxygen-based bidentate diketone --- sol-gel --- TGA-MS --- remediation of aqueous pollutants --- smectite --- adsorption --- pollutant removal --- environment remediation --- trimetallic --- iron oxide --- photocatalytic --- magnetic --- alcohol --- oxidation --- n/a --- sol-gel process --- UV-Vis-NIR photocatalysis --- sol-gel synthesis --- nano-Ag-TiO2 nanostructured nanofibers