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Since their discovery, multi-walled carbon nanotubes (MWCNTs) have received tremendous attention due to their unique electrical, optical, physical, chemical, and mechanical properties. Remarkable advances have been made in the synthesis, purification, structural characterization, functionalization, and application of MWCNTs. Their particular characteristics make them well suited for a plethora of applications in a number of fields, namely nanoelectronics, nanofluids, energy management, (electro)catalysis, materials science, construction of (bio)sensors based on different detection schemes, multifunctional nanoprobes for biomedical imaging, and sorbents for sample preparation or removal of contaminants from wastewater. They are also useful as anti-bacterial agents, drug delivery nanocarriers, etc. The current relevant application areas are countless. This Special Issue presents original research and review articles that address advances, trends, challenges, and future perspectives regarding synthetic routes, structural features, properties, behaviors, and industrial or scientific applications of MWCNTs in established and emerging areas.

graphene oxide --- n/a --- Multi-Walled Carbon Nanotube (MWCNT) --- elution --- gold nanoparticles --- MHD --- heck reaction --- drug delivery --- carbon-nanotubes --- water based nanofluid --- zeolitic imidazolate framework --- Ionic liquid --- electroanalysis --- curved stretching sheet --- multiwalled carbon nanotubes --- lubricating oil additives --- hydrophobic drugs --- agricultural irrigation water --- polarity --- cerium oxide --- adsorption --- electrical properties --- non-linear thermal radiation --- electrochemical properties --- nanomaterials --- radar absorbing materials --- chloride diffusion --- RAFT polymerization --- synthesis methods --- gold(III) --- mechanical properties --- dissolution rate --- carbon materials --- electrochemical sensors --- magnetic solid phase extraction --- silicone rubber --- Single-Walled Carbon Nanotube (SWCNT) --- Pd-CNT nanohybrids --- kinetics --- nonylphenol --- boundary layer --- Casson model --- sensing applications --- organochlorine pesticides --- composites --- multi-wall carbon nanotube (MWCNT) --- polymeric composites --- carbon nanotubes --- structural --- azide-alkyne click chemistry --- functionalized carbon nanotubes --- heat generation --- EMI shielding --- gold(I) --- cement mortars --- semi-homogeneous catalysis --- functionalized CNTs --- nanomedicine --- multi-walled carbon nanotubes --- numerical solution --- PMMA --- HAM --- complex permittivity --- thermal radiation --- stretching sheet

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The recovery of solid wastes for the preparation of innovative composite materials not only represents an economic advantage, but also offers an ecological opportunity for the utilization of by-products which would otherwise be landfilled. Specifically, the reuse and recycling of waste lead to important savings of raw materials and energy, since these by-products, generally deriv from agricultural or industrial activities, are abundant in nature. Moreover, a reduction of the environmental and related sanitary impacts can be also achieved. For this reason, a recycling operation is fundamental for the improvement of the environmental sustainability, because these secondary raw materials become a resource that can be easily reused without the modification of the peculiar characteristics, in order to obtain new and performing composites, with a low specific weight, high durability, and long life cycle.

Radioactive soil waste --- Gd2Ti2O7 pyrochlore --- SHS --- CeO2 --- Immobilization --- cementitious grout --- green grout --- cement --- slag substitution --- valorization --- circular economy --- cellulose aerogel --- oil absorbent --- cellulose --- white bamboo fibril --- water pollution --- natural rubber --- nanosilica --- mechanical property --- fertilizer plant --- hexafluorosilicic acid --- waste water --- cement composites --- recycled waste porous glass --- end-of-life tyre rubber --- safe production --- thermal insulation --- mechanical resistance --- render --- cement and cement-lime reinforced mortars --- natural fiber --- sheep’s wool --- sustainability --- chitosan film --- emerging pollutants --- ketoprofen --- food waste --- adsorption --- recycle --- recycled expanded polystyrene --- cement mortars --- eggshell --- Direct Blue 78 --- kinetics --- isotherms --- pulsed light --- fiber reinforced --- cementless composites --- microscopic property --- co-fired fly ash --- green materials --- biochar --- wheat straw --- sorbent --- cobalt --- copper --- soil --- n/a --- sheep's wool

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In the last decade, issues related to pollution from microplastics in all environmental compartments and the associated health and environmental risks have been the focus of intense social, media, and political attention worldwide. The assessment, quantification, and study of the degradation processes of plastic debris in the ecosystem and its interaction with biota have been and are still the focus of intense multidisciplinary research. Plastic particles in the range from 1 to 5 mm and those in the sub-micrometer range are commonly denoted as microplastics and nanoplastics, respectively. Microplastics (MPs) are being recognized as nearly ubiquitous pollutants in water bodies, but their actual concentration, distribution, and effects on natural waters, sediments, and biota are still largely unknown. Contamination by microplastics of agricultural soil and other environmental areas is also becoming a matter of concern. Sampling, separation, detection, characterization and evaluating the degradation pathways of micro- and nano-plastic pollutants dispersed in the environment is a challenging and critical goal to understand their distribution, fate, and the related hazards for ecosystems. Given the interest in this topic, this Special Issue, entitled “Microplastics Degradation and Characterization”, is concerned with the latest developments in the study of microplastics.

Mathematics & science --- Chemistry --- Quantum & theoretical chemistry --- PEEK --- SIRM --- damage mechanisms --- GISAXS --- irradiation --- micro and nanoplastics --- freshwater --- sludge --- optical detection --- portable devices --- in situ detection --- microplastics --- marine sediment --- pet --- nylon 6 --- nylon 6,6 --- reversed-phase HPLC --- polyolefin --- polystyrene --- Pyr-GC/MS --- polymer degradation --- microparticles --- PLA --- PBS --- enzymes --- specificity --- thermal profile --- activation energy --- wastewater --- Raman spectroscopy --- laser speckle pattern --- transmittance --- sedimentation --- HDPE --- microbeads --- photocatalysis --- scavengers --- C,N-TiO2 --- remediation --- nanotechnology --- plastic pollution --- visible light photodegradation --- microplastic --- ratiometric detection --- no-wash fluorescent probe --- imaging --- one-pot reaction --- water remediation --- nanoplastic --- artificial ageing --- polyolefins --- polyethylene terephthalate --- microplastic fiber --- washing textile --- drying textile --- polyester yarn types --- microplastic extraction --- oil extraction --- density separation --- GC–MS --- mass spectrometry identification --- plastic polymers --- polyethylene --- terrestrial --- soil --- polymers --- geotechnics --- landfills --- geosynthetics --- GCL --- clay liner --- hydraulic conductivity --- plastics --- anthropogenic activities --- quantification --- marine --- multi-parametric platform --- bioplastics --- marine environment --- spectroscopy --- resin pellets --- nanoplastics --- microplastic detection and identification --- microplastic quantification --- food packaging --- particle release --- plastic consumption --- ecotoxicity assessment --- size influence --- concentration influence --- microplastic pellets --- weathering --- degradation --- Yellowness Index --- Fourier transform infrared spectroscopy --- persistent organic pollutants --- oxidative digestion --- Fenton’s reagent --- virgin --- aged --- SEM --- FTIR --- PAHs --- surface water --- chemical composition --- Ho Chi Minh City --- cement mortars --- municipal incinerated bottom ash --- PET pellets --- hydrogel --- potassium and sodium polyacrylate --- swelling --- physicochemical changes in the water --- polymeric nanoparticles --- Portugal --- resin --- pharmaceutical --- PVC --- paint --- wastewater treatment plant --- South China Sea --- pollution --- Py-GC/MS --- fragmentation and degradation --- mechanism