We have taken 10 g/l, 5 g/l and 2.5 g/l as initial concentration. And calculated concentration equilibrium from absorbance uv-vis spectrometer. So 3 concentration will be enough for adsorption isotherm?
Three values of concentration, this is a good start. But the range of values is quite narrow. One or two orders of magnitude would be better.
Assuming a "simple" sorption isotherme such as Langmuir, the curve should fit the following equation: Cads/Ceq. = Rd = K× Qmax / (1+KL×Céq.)
To discriminate correctly K from Q, measurements should cover a wide range of Rd values: typically 0.1 < K×Ceq. < 10
Meaning over one order of magnitude. And also in the rigth range (Ceq.~1/K).
Because if Ceq.
No, adsorption isotherm cannot be calculated solely from three initial concentrations for heavy metal removal. Adsorption isotherms are experimental data that describe the relationship between the equilibrium concentration of a solute in solution and the amount of solute adsorbed onto a solid adsorbent at a constant temperature. These isotherms are typically obtained by conducting multiple experiments at different initial concentrations of the solute and measuring the equilibrium concentrations after adsorption.
To determine an adsorption isotherm, a series of experiments must be conducted at different initial concentrations of the heavy metal. The equilibrium concentrations of the metal in solution are then measured after adsorption, and the amount of metal adsorbed onto the adsorbent is calculated. By plotting the equilibrium concentration of the metal against the amount adsorbed, an adsorption isotherm can be obtained.
Having only three initial concentrations would not provide enough data points to accurately determine the shape and characteristics of the adsorption isotherm. Therefore, it is necessary to conduct experiments at multiple initial concentrations to obtain a complete picture of the adsorption behavior and calculate the adsorption isotherm
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