Temel, Nuket KartalSertakan, Kadriye Sibel2024-10-262024-10-2620240366-63522585-7290https://doi.org/10.1007/s11696-023-03125-3https://hdl.handle.net/20.500.12418/28589Water pollution caused by heavy metals is one of the most important issues threatening the environment. The study, presented here was focused on the removal of heavy metal Cu2+ ions from aqueous solution by using pristine multi-walled carbon nanotubes (p-MWCNT), acid treated MWCNTs (a-MWCNTs) and unzipped MWCNTs (u-MWCNTs). The size dependency of MWCNTs on the adsorption of Cu2+ ions was evaluated. Moreover, pH, adsorbent dosage, initial metal ion concentration and temperature effects on the adsorption process were explored. The maximum adsorption efficiency was found to be 98.5% for u-MWCNTs that is fabricated from the layered MWCNTs having an outer diameter of 50-80 nm and an inner diameter of 10-20 nm at 0.5 g L-1 adsorbent mass. The absorption kinetic data fitted best to the pseudo-second-order model. The thermodynamic assessments indicated that the adsorption was endothermic and randomness process. [GRAPHICS]en10.1007/s11696-023-03125-3info:eu-repo/semantics/closedAccessFunctionalized multi-walled carbon nanotubesCopper adsorptionIsotherm adsorption modelsThermodynamic adsorption modelsArticle7828498332-s2.0-85174418776Q2WOS:001086346300001Q3