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The equilibrium data for adsorption of Cr(VI) at fixed dose and temperature was fitted into the Langmuir isotherm model. The corresponding isotherm pattern and regression coefficients (R2) are given in Table 3.

Table 3

Langmuir constant for Cr(VI) removal

 Langmuir constant
AdsorbentsKLbR2
ET (0.3 mm) 0.086 0.002 0.99 
ET (1 mm) 0.090 0.003 0.99 
EU (0.3 mm) 0.273 0.123 0.99 
EU (1 mm) 0.320 0.018 0.99 
 Langmuir constant
AdsorbentsKLbR2
ET (0.3 mm) 0.086 0.002 0.99 
ET (1 mm) 0.090 0.003 0.99 
EU (0.3 mm) 0.273 0.123 0.99 
EU (1 mm) 0.320 0.018 0.99 

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