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The correlation coefficients (R2 values) for the pseudo-first and pseudo-second order plots are shown in Table 3.

Table 3

Correlation coefficients of pseudo-first and pseudo-second order kinetic models

Metal ion typePseudo-first order model (R2 value)Pseudo-second order model (R2 value)
Cu2+ 0.843 0.999 
Fe2+ 0.849 0.999 
Pb2+ 0.636 0.999 
Cr3+ 0.843 0.998 
Ni2+ 0.883 0.999 
Metal ion typePseudo-first order model (R2 value)Pseudo-second order model (R2 value)
Cu2+ 0.843 0.999 
Fe2+ 0.849 0.999 
Pb2+ 0.636 0.999 
Cr3+ 0.843 0.998 
Ni2+ 0.883 0.999 

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