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Table 2

Summary for isotherm model constants and coefficient of determination for Zn2+ and Ni2+ adsorption onto composite adsorbent

Langmuir isothermb (L/mg)Qo (mg/g)RLEquationR2
Zn2+ 0.022 21.74 0.58 y = 0.046C + 2.035 0.936 
Ni2+ 0.011 17.85 0.78 y = 0.056C + 4.793 0.964 
Freundlich isothermKF1/nEquationR2
Zn2+ 0.64 0.79  y = 0.794C − 0.454 0.997 
Ni2+ 0.25 0.87  y = 0.866C − 1.370 0.999 
Temkin isothermKT (L/mg)B1EquationR2
Zn2+ 0.34 3.4  y = 3.408C − 3.668 0.977 
Ni2+ 0.25  y = 2.019C − 2.769 0.988 
Langmuir isothermb (L/mg)Qo (mg/g)RLEquationR2
Zn2+ 0.022 21.74 0.58 y = 0.046C + 2.035 0.936 
Ni2+ 0.011 17.85 0.78 y = 0.056C + 4.793 0.964 
Freundlich isothermKF1/nEquationR2
Zn2+ 0.64 0.79  y = 0.794C − 0.454 0.997 
Ni2+ 0.25 0.87  y = 0.866C − 1.370 0.999 
Temkin isothermKT (L/mg)B1EquationR2
Zn2+ 0.34 3.4  y = 3.408C − 3.668 0.977 
Ni2+ 0.25  y = 2.019C − 2.769 0.988 
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