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Table 4 Dependence of adsorption (R, %) on time of contact with the solutions containing 1 mg of molybdenum at pH 2.5, 1 mg of vanadium, and 200 μg of chromium in the neutral medium

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

Ions Degree of adsorption (%)  
5 min 10 min 30 min 60 min 90 min Day
Partially crosslinked chitosan-clinoptilolite composite  
 Zn(II) 46.00 46.25 46.25 46.50 46.50 32.60
 Cu(II) 70.00 75.00 76.75 76.75 77.00 65.25
 Cd(II) 46.90 48.70 49.60 49.90 49.90 49.50
 Pb(II) 89.00 89.50 94.50 94.75 94.50 97.75
 Fe(III) 39.00 35.00 35.00 35.25 35.25 42.50
Partially crosslinked chitosan-saponite composite  
 Zn(II) 30.25 32.00 34.50 35.25 35.25 35.33
 Cu(II) 72.50 77.00 77.50 80.20 80.75 81.50
 Cd(II) 14.00 17.03 31.00 33.40 34.00 34.50
 Pb(II) 73.25 73.50 73.75 73.75 73.75 93.25
 Fe(III) 39.00 50.50 50.75 50.75 51.25 70.20
  1. Experimental conditions: mass of sorbent—0.1 g, volume of solution—20 ml, m 0 Zn—60 μg for chitosan-clinoptilolite, m 0 Zn—60 μg for chitosan-saponite, m 0 Fe, Cu, Cd, Pb—80 μg