Table 6 Values of the adsorption energies |− E1/2| for zinc and nickel adsorptions and |− E1| and |− E2| for chromium adsorption given in modulus values at 285, 290, 295 and 300 K.

From: Interpretation of the adsorption of metals on quartz crystal based-macromolecule via advanced modeling of equilibrium isotherms

Adsorption system

Adsorption energy

285 K

290 K

295 K

300 K

ZnCl2-porphyrin

|− E1/2| (kJ mol−1)

53.1

62.4

65.1

69.5

NiCl2-porphyrin

|− E1/2| (kJ mol−1)

32.9

36.8

38.1

40.8

CrCl2-porphyrin

|− E1| (kJ mol−1)

25.2

28.4

33.4

34.5

|− E2| (kJ mol−1)

16.9

18.8

20.3

20.9

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