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Table 5 Thermodynamic parameters of adsorption of Cu+2, Hg+2, Pb+2 and Cd+2 by DiGu.MC

From: Novel diaminoguanidine functionalized cellulose: synthesis, characterization, adsorption characteristics and application for ICP-AES determination of copper(II), mercury(II), lead(II) and cadmium(II) from aqueous solutions

  Ä\({\text{G}}_{{{\text{ads}}}}^{ \circ }\) (KJ/mol) Ä\({\text{H}}_{{{\text{ads}}}}^{ \circ }\) (KJ/mol) Ä\({\text{S}}_{{{\text{ads}}}}^{ \circ }\) (J/mol K)
  298 K 308 K 318 K   
Cu2+ − 27.51 − 2.92 − 0.321 − 436.2 − 1382.3
Hg2+ − 26.82 − 3.55 − 1.99 − 400.3 − 1264.1
Pb2+ − 27.65 − 4.04 − 0.91 − 429.45 − 1358.34
Cd2+ − 3.76 − 1.25 0 − 59.96 − 189.135