3.6. Isotherm studies
Ni(II) and Zn(II) uptake capacity onto the MBRC and MBAC at
different concentrations of metals on a fixed amount of adsorbent was
evaluated using Freundlich and Langmuir adsorption isotherms. The
Freundlich isotherm is represented by Eq. (1). The Freundlich isotherm
equilibrium, Kf (mg/g) and ‘n’ are constants which are adsorption
capacity and intensity of adsorption, respectively. A plot of logqe
versus logCe gives a straight line with correlation coefficient (R2) of
0.5344 and 0.9943 for Ni(II) onto MBRC and MBAC, respectively and
0.2446 and 0.9229 for Zn(II) onto MBRC and MBAC, respectively
(Table 1).The Langmuir [43] isotherm assumes that a solid surface has a
finite number of identical sites which are energetically uniform.
According to this model, there is no interaction between adsorbed
species, which means that the amount adsorbed has no influence on
the rate of adsorption. A monolayer was formed when the equilibrium
was attained. Its linear mathematical form is as follows:
3.6. Isotherm studies
Ni(II) and Zn(II) uptake capacity onto the MBRC and MBAC at
different concentrations of metals on a fixed amount of adsorbent was
evaluated using Freundlich and Langmuir adsorption isotherms. The
Freundlich isotherm is represented by Eq. (1). The Freundlich isotherm
equilibrium, Kf (mg/g) and ‘n’ are constants which are adsorption
capacity and intensity of adsorption, respectively. A plot of logqe
versus logCe gives a straight line with correlation coefficient (R2) of
0.5344 and 0.9943 for Ni(II) onto MBRC and MBAC, respectively and
0.2446 and 0.9229 for Zn(II) onto MBRC and MBAC, respectively
(Table 1).The Langmuir [43] isotherm assumes that a solid surface has a
finite number of identical sites which are energetically uniform.
According to this model, there is no interaction between adsorbed
species, which means that the amount adsorbed has no influence on
the rate of adsorption. A monolayer was formed when the equilibrium
was attained. Its linear mathematical form is as follows:
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