Τhe application of oxidized carbon derived from Luffa cylindrica for caffeine removal. Equilibrium, thermodynamic, kinetic and mechanistic analysis

Comparative removal of hazardous cationic dyes by MOF-5 and modified graphene oxide

“…It is noticeable that contrary to adsorption efficiency, the adsorbent capacity increased dramatically by dye concentration in the studied range, from ~ 44 to ~ 101 mg/g, and from ~ 62.4 to ~ 231 mg/g for MOF-5 and ACS-RGO, respectively. Similar observations were reported for dye eriochrome black-T removal onto ZIF-67-OAc 56 , caffeine removal by oxidized carbon 57 , Cr(VI) removal by fly ash 58 , antibiotics 59 removals by MOFs, direct Blue-71 removal onto multi-walled carbon nanotubes 60 , and in advance oxidation processes such as petroleum hydrocarbons degradation by ozonation 61 .…”

Mechanism and behavior of caffeine sorption: affecting factors

“…These results conrm that the adsorption is exothermic. 41 The maximum adsorption capacities were found to be 5.4 mg g À1 , 6.5 mg g À1 , and 6.26 mg g À1 , respectively, in the adsorption study carried out by Anastopoulos et al in 2020, using biochar obtained by the oxidation of pine needles selected for caffeine adsorption. When these results are analyzed, it is clear that as the temperature rises from 298 K to 313 K, the adsorption capacity increases slightly, but as the temperature rises to 323 K, the adsorption capacity decreases.…”

Magnetic solid-phase extraction of caffeine from surface water samples with a micro–meso porous activated carbon/Fe3O4 nanocomposite prior to its determination by GC-MS

“…Electrostatic attraction could be also developed between the adsorbate and the adsorbent, indicating that the adsorption of caffeine on the magnetic carbon surface could be also be based on electrostatic interactions. 39 Additionally, the appearance of C–N stretching vibration at ∼1200 cm −1 in the caffeine treated carbon demonstrated that the caffeine donated electrons to the carbon surface, while the intensity increase of the C–O absorption at ∼1053 cm −1 showed that the caffeine acted as an electron acceptor from the carbon. Thus, caffeine was also adsorbed on magnetic carbon surface via the electron donor–acceptor mechanism.…”