You need to know the inlet concentration Cin, the outlet concentration versus time, and the volumetric flow rate, which should be constant. With this data, plot Cin-Ci = f(Vi) (Vi = Fvti, i = 1, .., n), then the adsorbed mass will be equal to the area under the curve.

Dear Prof. Mirosław Grzesik ,

Thank you for your answer.

Would you please explain it more?

What is there to explain? In the case of a batch process, m = (Co-C)V, where V = const. In a continuous (flow) process, V increases and C changes. Therefore m=∫(0->Vf) (Cin-C (V))dV, which definite integral can be calculated graphically as the area under the Cin-C vs V curve ( V = Fvt). Unless you mean describing the change in bulk concentration? Then the mass balance in the form of a partial differential equation/s.