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Table 3 The degree of adsorption of Zn(II), Cu(II), Fe(III), Cd(II), and Pb(II) cations by synthesized composites as a function of the medium acidity

From: Natural Minerals Coated by Biopolymer Chitosan: Synthesis, Physicochemical, and Adsorption Properties

Ions Degree of adsorption (%)
pH 1.0 HCl pH 2.5 acetic acid pH 5.0 acetate buffer Distilled water pH 8.0 ammonium acetate buffer
Partially crosslinked chitosan-clinoptilolite composite
 Zn(II) 10.60 0.00 0.00 32.60 47.33
 Cu(II) 0.00 2.5 10.00 65.25 86.00
 Cd(II) 7.5 2.5 3.75 49.50 37.00
 Pb(II) 27.00 47.00 13.75 97.75 99.00
 Fe(III) 0.00 2.50 15.00 42.50 90.00
Partially crosslinked chitosan-saponite composite
 Zn(II) 1.33 2.33 0.00 35.33 69.66
 Cu(II) 0.00 12.5 10.00 81.50 86.00
 Cd(II) 7.00 2.5 3.75 34.50 28.50
 Pb(II) 12.75 4.75 7.00 93.25 97.75
 Fe(III) 0.00 2.50 20.00 70.20 92.50
  1. Experimental conditions: mass of sorbent—0.1 g, volume of solution—20 ml, m 0 Zn—60 μg, m 0 Fe, Cu, Cd, Pb—80 μg