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- W4308485060 endingPage "120720" @default.
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- W4308485060 abstract "• A cationic surfactant, CTAB, was removed from the aqueous solutions using GO-based adsorbents. • The pseudo-second-order kinetic model fitted on experimental data. • The adsorption isotherm curves of all adsorbents were the L shape. • CTAB molecules bond with the surface of adsorbents via electrostatic, hydrophobic and π –cationic interactions. • Pore-filling does not play a significant role in the adsorption of CTAB molecules on adsorbents. In this research, the adsorption of a cationic surfactant, Cetyl Trimethyl Ammonium Bromide (CTAB), on graphene oxide-based adsorbents was investigated. The adsorbents consist of graphene oxide (GO), reduced graphene oxide (rGO), functionalized graphene oxid by humic acid (GO-HA), and functionalized reduced graphene oxid by thionine acetate (rGO-Th) that are characterized by the Scanning Electron Microscopy (SEM), Fourier Transform Infrared Spectrophotometry (FT-IR), X-Ray Diffraction (XRD) and Brunauer- Emmett- Teller (BET) analysis. Examine factors affecting the adsorption of CTAB such as pH, contact time, adsorbent dosage, and agitation speed were investigated. Based on the results, the optimum pH for GO, rGO, GO-HA, and rGO-Th were 7, 8, 6.5, and 10, respectively and the optimum contact time and agitation speed were 30 minutes and 450 rpm, respectively. Also, kinetic, isothermal, and thermodynamic studies were done and the results indicated that the pseudo-second-order kinetic model fitted on experimental data for all of adsorbents. Under the optimum conditions, the maximum adsorption capacity of GO, rGO, GO-HA, and rGO-Th were 2000, 238, 3333, and 159 mg/g, and the fitted isotherm models were BET, Langmuir, Freundlich, and Langmuir, respectively. The adsorption thermodynamic suggested that CTAB adsorption on GO and GO-HA are exothermic and on rGO and rGO-Th are endothermic processes. The results indicated that physical properties of adsorbents such as surface area do not play a significant role and the electrostatic interaction between CTAB molecules and the functional groups of adsorbents plays a key role in CTAB adsorption on GO-based adsorbents." @default.
- W4308485060 created "2022-11-12" @default.
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- W4308485060 date "2022-12-01" @default.
- W4308485060 modified "2023-10-11" @default.
- W4308485060 title "Application of graphene oxide and its derivatives on the adsorption of a cationic surfactant (interaction mechanism, kinetic, isotherm curves and thermodynamic studies)" @default.
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- W4308485060 doi "https://doi.org/10.1016/j.molliq.2022.120720" @default.
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