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The related parameters of two models are calculated and displayed in Table 2. From the linear correlation coefficients (R2) at different temperatures, it can be found that the Langmuir model is more suitable for describing the adsorption of MO on CFG compared to the Freundlich model. In addition, the F values obtained from the Langmuir equation are far higher than those from the Freundlich equation. The results suggest that monolayer adsorption of MO on CFG is the main mechanism (Li et al. 2012). Besides, the values of qmax calculated from the Langmuir model are the highest at T = 298 K and the lowest at T = 318 K, which indicates that increasing temperature is unfavorable to the adsorption and the adsorption process is exothermic.

Table 2

Parameters for Langmuir and Freundlich isotherm models

T (K)Langmuir model
Freundlich model
qmax (mg g−1)b (L mg−1)R2FKF (mg(1–n-1)Ln·g−1)nR2F
298 263 0.09 0.9996 17,374 119 7.68 0.95293 143 
308 246 0.07 0.99873 5,515 107 7.46 0.9709 234 
318 220 0.04 0.99865 5,181 77 6.1 0.95922 165 
T (K)Langmuir model
Freundlich model
qmax (mg g−1)b (L mg−1)R2FKF (mg(1–n-1)Ln·g−1)nR2F
298 263 0.09 0.9996 17,374 119 7.68 0.95293 143 
308 246 0.07 0.99873 5,515 107 7.46 0.9709 234 
318 220 0.04 0.99865 5,181 77 6.1 0.95922 165 

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