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The triple-R model (reduce, reuse, and recycle) is the essential concept of the circular economy. Due to population growth, the recovery of added-value products from wastes has become a challenge. Wastewaters of different origin (urban, industrial, mining, textile, distillery, and microbial culture, among others) are rich in energy, water, and nutrient sources that can be recovered and reused within a circular economy framework. Recently, wastewater treatment plants have been converted into biofactories, since they can convert waste into new products (water, nutrients, fertilizers, biomethane, electricity, heat, etc.) with a minimal environmental impact. In this context, adsorption and ion-exchange, as well as the integration of both processes, have been proposed as promising technologies for the treatment of wastewaters for resource recovery. Therefore, the aim of this Special Issue, entitled “Wastewater Treatment by Adsorption and/or Ion-Exchange Processes for Resource Recovery”, is to promote these two processes as innovative and environmentally friendly alternatives for the recovery of secondary raw materials from by-products or waste streams. These processes could improve the environmental, economic, and social impacts of the currently used wastewater treatment techniques.

clay --- dye --- adsorption --- isotherm --- kinetics --- hydroxyapatite --- calcium carbonate --- coating --- heavy metal sorption --- groundwater remediation --- adsorption technology --- ultra-sonication --- phosphate removal --- granular ferric hydroxide --- micro-sized adsorbents --- organic acid --- circular economy --- optimization process --- bio-economy --- response surface methodology --- corn stream --- surface-active compounds --- eco-adsorbents --- green membranes --- resource recovery --- hybrid biosorbent --- desorption --- thermodynamic --- nanofiltration --- n/a

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The triple-R model (reduce, reuse, and recycle) is the essential concept of the circular economy. Due to population growth, the recovery of added-value products from wastes has become a challenge. Wastewaters of different origin (urban, industrial, mining, textile, distillery, and microbial culture, among others) are rich in energy, water, and nutrient sources that can be recovered and reused within a circular economy framework. Recently, wastewater treatment plants have been converted into biofactories, since they can convert waste into new products (water, nutrients, fertilizers, biomethane, electricity, heat, etc.) with a minimal environmental impact. In this context, adsorption and ion-exchange, as well as the integration of both processes, have been proposed as promising technologies for the treatment of wastewaters for resource recovery. Therefore, the aim of this Special Issue, entitled “Wastewater Treatment by Adsorption and/or Ion-Exchange Processes for Resource Recovery”, is to promote these two processes as innovative and environmentally friendly alternatives for the recovery of secondary raw materials from by-products or waste streams. These processes could improve the environmental, economic, and social impacts of the currently used wastewater treatment techniques.

Technology: general issues --- History of engineering & technology --- Environmental science, engineering & technology --- clay --- dye --- adsorption --- isotherm --- kinetics --- hydroxyapatite --- calcium carbonate --- coating --- heavy metal sorption --- groundwater remediation --- adsorption technology --- ultra-sonication --- phosphate removal --- granular ferric hydroxide --- micro-sized adsorbents --- organic acid --- circular economy --- optimization process --- bio-economy --- response surface methodology --- corn stream --- surface-active compounds --- eco-adsorbents --- green membranes --- resource recovery --- hybrid biosorbent --- desorption --- thermodynamic --- nanofiltration --- n/a

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In a similar way to many other engineering fields, the road pavement industry strongly affects the critical issues of our generation, including climate change, pollutant emission, the exploitation of natural resources and economic crises. For this reason, technicians and researchers are searching ravenously for sustainable solutions to implement in current road construction systems with the following goals: To reduce the consumption of energy and virgin materials; To run environmentally and economically friendly maintenance; To recycle waste from different industrial processes; To decrease the noise, the pollution and the heat generated by traffic, particularly in urban contexts. This Special Issue aims to collect high-quality studies that combine the aforementioned solutions, including works pertaining to: The hot, warm, and cold recycling of reclaimed asphalt pavement; Marginal materials for asphalt pavements; Innovative sustainable materials; Durability and environmental aspects; Structure performance, modeling and design; Advanced trends in rehabilitation and preservation; Surface characteristics and road safety; Management system/life cycle analysis; Urban heat island mitigation; Energy harvesting.

porous concrete --- metakaolin --- geopolymers --- permeable pavements --- urban drainage systems --- maintenance --- reinforced asphalt pavement --- geogrid --- interlayer bonding --- static shear test --- cyclic shear test --- fatigue properties --- warm mix asphalt --- natural zeolite --- gas emissions --- energy consumption --- production costs --- bituminous mixtures --- nano-additives --- nanoclay --- carbon nanotubes --- graphene nanoplatelets --- nano-calcium oxide --- nano-titanium dioxide --- sonication --- fatigue performance --- self-healing --- hot-mix asphalt --- ageing --- cooling --- temperature segregation --- hauling --- insulated truck --- re-heating --- contact stresses --- rolling resistance --- braking --- free rolling --- load --- inflation pressure --- speed --- porosity --- permeability coefficients --- mixing ratio --- aggregate size --- compressive strength --- computed tomography (CT) image --- ex-post CBA --- road modernisation --- incidence of traffic accidents --- decision-making process --- life cycle assessment --- waste management --- circular economy --- alternative materials --- construction --- road stabilisation --- bearing capacity --- unbound base course --- cold central-plant recycled base course --- falling weight deflectometer (FWD), cold recycling in-plant --- bitumen --- aging --- rejuvenation --- reclaimed asphalt --- recycling --- coal bottom ash --- waste material --- recycle --- construction industry --- civil engineering --- bitumen selection --- performance-graded bitumen --- asphalt pavement temperatures --- temperature maps --- n/a

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This book describes recent studies in the development of nanomaterials for various secondary batteries, including Li-ion batteries (LIBs), Li–air batteries, and multivalent aqueous batteries. A simple, low-cost, and scalable synthetic process for the development of nanomaterials is another research topic in this book. The recent studies dedicated by researchers in this book highlight the importance of innovative nanostructures and new functional materials, which can open new opportunities for battery research.

Research & information: general --- Physics --- SnO2 --- self-assembly --- MoS2 --- nanosheets --- lithium-ion battery --- inorganic filler --- gel polymer electrolytes --- TiO2 --- Al2O3 --- SiO2 --- ZrO2 --- CeO2 --- BaTiO3 --- lithium polymer batteries --- Ag --- nanoparticle --- high rate --- zinc metal anode --- copper coating --- alloy interfacial layer --- uniform Zn deposition --- aqueous zinc-ion battery --- Ce-doped LaMnO3 perovskite --- XPS of LaMnO3 --- bifunctional activity --- probe sonication --- carbon-based composite --- transition metal dichalcogenide --- aqueous multivalent metal-ion batteries --- zinc-ion batteries --- magnesium-ion batteries --- aluminum-ion batteries --- aqueous batteries --- electrochemistry --- electrode materials --- ammonium vanadate --- ZnO --- composites --- binary --- ternary --- LIBs --- anode --- Zn metal anode --- aqueous Zn ion batteries --- mildly acidic electrolyte --- dendrite-free --- hydrogen evolution reaction suppression --- InSb --- InSb-C --- PAA binder --- anodes --- Li-ion batteries --- WS2 --- W2C --- hydrothermal method --- carbon nanotubes --- lithium-ion batteries

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This work covers all aspects related to the obtainment, production, design, and processing of biopolymers obtained from natural resources. Moreover, it studies characteristics related to the improvement of their performance to increase their potential application at an industrial level, in line with the concept of a global circular economy. Thus, this work firstly classifies biopolymers obtained from natural resources (e.g., biobased building blocks and biopolymers extracted directly from plants and biomass), and then summarizes several cutting-edge research works focused on enhancing the performance of biopolymers from natural resources to extend their application in the industrial sector, and contribute to the transition to more sustainable plastics.

Technology: general issues --- History of engineering & technology --- PHBH --- almond shell flour --- mechanical properties --- thermal characterization --- WPCs --- bacterial polyesters --- poly(3-hydroxybutyrate-co-3hydroxyhexanoate)—PHBH --- poly(ε-caprolactone)—PCL --- binary blends --- improved toughness --- mechanical and thermal characterization --- Cucumis metuliferus --- extraction --- antioxidant activity --- coating --- cellulose acetate --- LDPE --- bilayer packaging --- active packaging --- poly(lactic acid) --- mechanical recycling --- yerba mate --- bionanocomposites --- polysulfide-derived polymers --- cottonseed oil --- fatty acid of cottonseed oil --- sodium soap of cottonseed oil --- PLA --- nanocomposites --- functional properties --- thymol --- migration --- films --- cutin --- cuticles --- bioplastics --- biopolymers --- solanum: CPMAS 13C NMR --- softgels --- mucilage --- in vitro digestion --- bioaccessibility --- bran content --- plasticized wheat flour --- citric acid --- biobased blends --- biopolymer --- carboxymethyl cellulose --- solid polymer electrolyte --- ionic transport --- chitosan --- potato starch --- microwave --- foam --- orthogonal experiments --- empty fruit bunch --- regenerated cellulose --- ionic liquid --- methyl methacrylate --- 3D printing --- syringe extrusion 3D printing --- hydroxypropyl methylcellulose --- orodispersible film --- phenytoin --- PA610 --- halloysite nanotubes (HNTs) --- flame retardant --- cone calorimeter --- agricultural waste --- asparagus --- CMC --- degree of substitution --- DS --- cellulose extraction --- thermoplastic starch --- dolomite --- biocomposite --- sonication --- bacterial cellulose --- nata de coco --- sodium hydroxide --- lignin --- nanoparticles --- biorefinery --- organosolv pretreatment --- polyelectrolyte multi-layers --- sodium alginate --- k-carrageenan --- cellulosic nonwoven textile --- surface functionalization --- characterization --- bio-sorption --- isotherms --- natural fibers --- soy protein --- chitin --- coir --- comfort --- functional textiles --- Circular Bioeconomy --- carbonation reaction --- selectivity optimization --- carbonated epoxidized linseed oil --- non-isocyanate polyurethane --- argan shell particles --- wood plastic composite --- polyethylene --- compatibilization --- air permeability --- fungal fibers --- hemp fibers --- microstructure --- mycocel --- softwood fibers --- virus membrane filtration --- allotropic transition --- choline chloride --- plasticizer --- starch dissolution --- n/a --- poly(3-hydroxybutyrate-co-3hydroxyhexanoate)-PHBH --- poly(ε-caprolactone)-PCL