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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.

Technology: general issues --- 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 --- 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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Various scientific events are being held around the world under the auspices of this landmark event, the Year of Mineralogy, and it is highly satisfying that this Special Issue “Mineralogical Crystallography Volume II” is published in 2022. The first volume of the “Mineralogical Crystallography” Special Issue [1] consisted of such topics as: Discovery of new mineral species; Crystal chemistry of minerals and their synthetic analogs; Behavior of minerals at non-ambient conditions; Biomineralogy; and Crystal growth techniques, and appeared to be very fruitful. The Special Issue “Mineralogical Crystallography Volume II” covers the following topics: Crystal chemistry and properties of minerals and their synthetic analogs; Gemology; Natural-based cement materials; Biomineralogy; and Crystal growth techniques. Additionally, we hope that this continuation will be just as successful, and that the new set of papers will again arouse genuine interest among readers and, perhaps, inspire them in their own successful research. We also believe that with the current collection of papers, we will be able to pay tribute to the union of Mineralogy and Crystallography.

Research & information: general --- uranyl --- carbonate --- mineral --- crystal structure --- topology --- structural complexity --- bentonite --- mordenite --- smectite --- pozzolanicity test --- cement --- concrete --- shchurovskyite --- synthesis --- X-ray diffraction --- oxocentered tetrahedra --- Barite --- hydrothermal synthesis --- typomorphic characteristics --- in-situ mixing solutions at high temperature --- high iron and quartz contents coal gangue --- acid leaching --- alkali melting --- hydrothermal reaction --- NaA zeolite --- fluorite --- pozzolan --- mortar --- mechanical strength --- reduction of CO2 emissions --- hydroxyapatite composite --- spinel --- beverage cans --- bovine bones --- lorenzenite --- perovskite --- loparite --- titanite --- apatite --- carbonates --- Khibiny --- Lovozero --- Kovdor --- Afrikanda --- alkaline intrusions --- NF Fennoscandia --- glass-ceramics --- phase separation --- nucleation --- crystallization --- microstructure --- gahnite --- gold nanoparticles --- surface plasmon resonance --- plasmonics --- ivanyukite --- lintisite --- SIV --- AM-4 --- sorption --- lead --- ion-exchange --- titanosilicate --- Arctic --- channel-water --- X-ray fluorescence --- infrared spectroscopy --- UV–vis spectroscopy --- transition metal ions --- self-healing concrete --- calcium nitrate --- mineralization reaction --- cracks --- near-infrared spectroscopy --- kaolinite --- dickite --- OH group --- forsterite --- boron --- spectroscopy --- orthoclase crystal --- ultra-microchannel --- water --- feldspar alteration --- sericitization --- gemological --- mineralogical --- greenish blue apatite --- fluorapatite --- n/a --- UV-vis 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

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Demand for advanced X-ray scattering techniques has increased tremendously in recent years with the development of new functional materials. These characterizations have a huge impact on evaluating the microstructure and structure–property relation in functional materials. Thanks to its non-destructive character and adaptability to various environments, the X-ray is a powerful tool, being irreplaceable for novel in situ and operando studies. This book is dedicated to the latest advances in X-ray diffraction using both synchrotron radiation as well as laboratory sources for analyzing the microstructure and morphology in a broad range (organic, inorganic, hybrid, etc.) of functional materials.

lead-free ceramic --- sol–gel process --- barium zirconate titanate --- dielectric property --- conjugated polymer and blends --- in situ GIXD --- additive --- structure --- strain --- X-ray diffraction --- piezoelectric properties --- lanthanum-modified lead zirconate titanate (PLZT) --- zeolite-W --- cation form --- synchrotron X-ray diffraction --- Rietveld refinement --- high-pressure --- smectite --- bulk moduli --- anhydrous and hydrous environments --- synchrotron X-ray powder diffraction --- pressure-transmitting media --- metallic composites --- Ni --- Ni-W alloys --- silver-exchanged natrolite --- pressure-induced insertion --- high energy-density materials --- high pressure and temperature --- Raman spectroscopy --- ammonium azide --- polynitrogen compounds --- superalloys --- low-angle boundaries --- X-ray topography --- turbine blades --- crystal growth --- nano-perovskite (CaTiO3) --- Young’s modulus --- ultrasonic-pulse echo --- planar density --- residual stress --- laser cavitation peening --- pulse laser --- wedge-shaped amphiphile --- double gyroid phase --- grazing-incidence X-ray scattering --- environmental atomic force microscopy --- vapor annealing --- Williamson-Hall (W-H) --- uniform stress deformation model (USDM) --- hydroxyapatite --- ultrasonic pulse-echo --- thermoplastic polyurethane ureas --- shape memory materials --- synchrotron SAXS/WAXS --- polymer deformation --- lamellar morphology --- poly-ε-caprolactone --- poly(1,4-butylene adipate)