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The correlation coefficients (R2 values) for the Langmuir and Freundlich plots are shown in Table 4.

Table 4

Correlation coefficients for Langmuir and Freundlich adsorption isotherms

Metal ion typeLangmuir model (R2 value)Freundlich model (R2 value)
Cu2+ 0.991 0.669 
Fe2+ 0.986 0.658 
Pb2+ 0.994 0.679 
Cr3+ 0.992 0.676 
Ni2+ 0.998 0.608 
Metal ion typeLangmuir model (R2 value)Freundlich model (R2 value)
Cu2+ 0.991 0.669 
Fe2+ 0.986 0.658 
Pb2+ 0.994 0.679 
Cr3+ 0.992 0.676 
Ni2+ 0.998 0.608 

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