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Adsorption is a well-established operation used for water decontamination and the remediation of industrial effluents. It is also recognized as a key technology for recovering substances of economic interest or those at risk of scarcity. The new sustainability paradigm of the circular economy and the current context of promoting the efficient use of natural resources, water and energy have been motivating the search for eco-friendly adsorbents for water and wastewater treatment and resource recovery. This Special Issue compiles 21 papers (17 research articles and 4 reviews), addressing the removal of heavy metals, toxic metalloids, precious metals and organics from aqueous solution, using a wide variety of adsorbents derived from natural and waste materials.

activated carbon --- modification --- surfactant --- adsorption --- methylene blue --- ions effect --- anionic dye --- cetyltrimethylammonium bromide --- sepiolite --- two-step modification --- electroplating sludge --- hydrothermal process --- heavy metal --- electroplating wastewater --- upcycling --- biochar --- thiourea --- cadmium pollution --- adsorption characteristics --- water treatment --- manganese --- iron --- banana peel --- pre-treatment --- phosphoric acid --- human hair --- kinetics --- isotherms --- biosorption --- algae --- bacteria --- biosorbent --- pharmaceutical waste --- complex nickel-aluminum-zirconium hydroxide --- arsenic ion --- different fractions --- Hg2+ --- characterization --- adsorption mechanism --- bisphenol A --- equilibrium --- heavy metals --- K-type zeolite --- fly ash --- lead --- immobilization --- Pb2+ removal --- sorption --- precipitation --- waste recycling --- removal mechanisms --- solid-to-water ratio --- microcystin --- separation --- water quality --- cyanobacteria --- algal bloom --- phenols --- polycyclic aromatic hydrocarbons --- wastewater --- precious metals --- hydrometallurgical processing --- selectivity --- pine bark --- olive mill wastewater --- carbon nanotubes --- polydimethilsiloxane --- waste treatment --- phenolic compounds --- resources recovery --- dyes removal --- wastewater treatment --- agrowaste biomass --- diclofenac removal --- advanced oxidation treatments --- low-cost sorbents --- nano zerovalent iron --- granular activated carbon --- organoselenium --- water --- treatment --- cadmium --- cellulose nanofibrils --- iron nanoparticles