Adsorption of anionic dye Direct Red 23 onto magnetic multi-walled carbon nanotubes-Fe3C nanocomposite: Kinetics, equilibrium and thermodynamics

Preparation of Magnetic Multi-Walled Carbon Nanotubes to Adsorb Sodium Dodecyl Sulfate (SDS)

“…Konicki et al investigated the performance of MMWCNTs for separation of anionic direct red dye from aqueous solutions. Experimental data were consistent with Freundlich isotherm and adsorption capacity was reported 70 mg/g for the dye at 60°C (19). Zhu et al reported that separation efficiency could get close to 90% for carcinogenic dyes from aqueous solutions using chitosan adsorbents modified by magnetic carbon nanotubes.…”

“…An increase in contact time (from 10 to 180 minutes) led to the gradual improvement in adsorption capacity of adsorbent that may be due to the use of all adsorbent sites over a long period. After reaching the equilibrium time (120 minutes), the equilibrium state was established between adsorbent (MMWCNTs) and adsorbate (SDS) (18,19). No significant changes in SDS adsorption were observed after the equilibrium time.…”

Preparation of amine functionalized carbon nanotubes via a bioinspired strategy and their application in Cu2+ removal

“…where C e (mg/L) is the equilibrium concentration of Cu 2+ ions and Q e (mg/g) is the equilibrium adsorption amount of absorbed heavy metal ions, K F [(mg/g) (L/mg) 1/n ] and n are the Freundlich constant related to the maximum adsorption capacity and constant of adsorption intensity [56]. The value of correlation coefficient (R 2 ) from Freundlich model those parameters mentioned-above and are shown in Table 4.…”

“…The temperature plays an important role in the adsorption process [56]. In order to investigate the effect of temperature; the experiment was carried out at different temperature (300 K, 305 K, 310 K, 325 K, and 320 K) at pH 7.0 for 60 min.…”

Adsorption of Acid Red 88 Anionic Dye from Aqueous Solution onto ZnO/ZnMn2O4 Nanocomposite: Equilibrium, Kinetics, and Thermodynamics

“…Many adsorbents have been investigated regarding the possibility to lower dye concentrations from such aqueous solutions such as activated carbon [7], carbon nanotubes [8], nanocrystalline magnetic composites [9], graphene [10], fly ash [6], and others [11][12][13].…”