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Table 4

Freundlich, Langmuir and Dubinin-Astakhov isotherm parameters for MB adsorption on RH-1 and RH-2 (T = 298 K)

ParameterSample
RH-1RH-2
Freundlich equation 
Linearization equation y = 0.096x − 2.761 y = 0.105x − 2.312 
R2 0.93 0.97 
kf, (mmol g−1) · (L mmol−1)n 0.06 0.09 
1/n 0.10 0.10 
Langmuir equation 
Linearization equation y = 1.4467x − 20 y = 0.1309x + 9.794 
R2 0.66 0.84 
Ssp (m2 g−1– 122.94 
q (mmol g−1– 0.10 
k (g mmol−1– 0.01 
RL – 0.99 
Dubinin-Astakhov equation 
Linearization equation y = −0.096x − 2.425 y = −1·10−6x − 2.217 
R2 0.93 (n = 1) 0.89 (n = 6) 
k (mol kJ−10.04 4.33 
q (mmol g−10.09 0.11 
Е (kJ mol−125.80 24.76 
W (cm3 g−10.038 0.047 
Ssp (m2 g−1) 106.52 131.21 
ParameterSample
RH-1RH-2
Freundlich equation 
Linearization equation y = 0.096x − 2.761 y = 0.105x − 2.312 
R2 0.93 0.97 
kf, (mmol g−1) · (L mmol−1)n 0.06 0.09 
1/n 0.10 0.10 
Langmuir equation 
Linearization equation y = 1.4467x − 20 y = 0.1309x + 9.794 
R2 0.66 0.84 
Ssp (m2 g−1– 122.94 
q (mmol g−1– 0.10 
k (g mmol−1– 0.01 
RL – 0.99 
Dubinin-Astakhov equation 
Linearization equation y = −0.096x − 2.425 y = −1·10−6x − 2.217 
R2 0.93 (n = 1) 0.89 (n = 6) 
k (mol kJ−10.04 4.33 
q (mmol g−10.09 0.11 
Е (kJ mol−125.80 24.76 
W (cm3 g−10.038 0.047 
Ssp (m2 g−1) 106.52 131.21 
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