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Table 4 Langmuir and Freundlich constants for metal adsorption 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

Langmuir isotherm model KL(L/g) qm(mg/g) R2 RL
Adsorbates     
 Cu2+ 0.323 101.01 0.9968 0.0122–0.0583
 Hg2+ 0.371 73.50 0.9965 0.0107–0.0512
 Pb2+ 0.497 112.36 0.9981 0.008–0.0387
 Cd2+ 0.067 64.52 0.9904 0.0563–0.2299
Freundlich isotherm model KF n R2
Adsorbates    
 Cu2+ 81.48 35.84 0.8461
 Hg2+ 63.94 48.78 0.8606
 Pb2+ 91.49 33.33 0.8443
 Cd2+ 27.26 6.73 0.8167