mg/g. The linear plot of Ce/(x/m) vs. Ce in Fig. 4c shows that the
adsorption of Cr(VI) onto TCF surface obeys Langmuir adsorption
isotherm with the values of Q0 as of 500 mg/g and b as of 0.075 L/
mg. The correlation coefficient of linear regression for Langmuir
isotherm is 0.9931.
Freundlich equation was also used to adsorption of Cr(VI) onto
TCF surface. The Freundlich characteristic constants, kf and n, are
the indicators of the adsorption and the adsorption intensity,
respectively. The Freundlich isotherm is represented by the
equation.