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Calculated from the Langmuir isotherm model, the maximum equilibrium adsorption capacity (qmax) of MO on CFG is 263 mg g–1 at 298 K. A comparison of qmax for MO uptake between CFG and different magnetic adsorbents reported in the literature can be seen in Table 3. It is obvious that CFG synthesized in this work exhibits quite a high qmax, which suggests that the as-synthesized CFG can be considered as an effective adsorbent for the removal of MO dye from wastewater.

Table 3

Summary of MO maximum adsorption capacities on various magnetic adsorbents

Adsorption capacity
Adsorbentqmax (mg.g–1)T/KReference
ZnLa0.02Fe1.98O4/MWCNTs 81 298 Zhang & Nan (2015)
Co/MWCNTs 170 293 Zhao et al. (2015)
MPGM 80 298 Wang et al. (2015)
MWCNT/SPIONs 10.89 298 Bayazit (2014)
CoFe2O4–FGS 71.54 300 Li et al. (2011)
m-CS/g-Fe2O3/MWCNTs 66 293 Shuang et al. (2012)
CFG 263 298 This work
Adsorption capacity
Adsorbentqmax (mg.g–1)T/KReference
ZnLa0.02Fe1.98O4/MWCNTs 81 298 Zhang & Nan (2015)
Co/MWCNTs 170 293 Zhao et al. (2015)
MPGM 80 298 Wang et al. (2015)
MWCNT/SPIONs 10.89 298 Bayazit (2014)
CoFe2O4–FGS 71.54 300 Li et al. (2011)
m-CS/g-Fe2O3/MWCNTs 66 293 Shuang et al. (2012)
CFG 263 298 This work

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