Table 2 Results of batch desorption study of Crystal Violet dye and Carbonate ion.
From: Elution profile of cationic and anionic adsorbate from exhausted adsorbent using solvent desorption
Eluent | Nos. of cycles | Desorption efficiency (%) | |
|---|---|---|---|
Congo Red dye | Carbonate ion | ||
0.05 to 0.20 M acid solution (HCl, H2SO4, HNO3, CH3COOH, EDTA) | First | 1.0–2.3 | 1.2–2.8 |
Solvents (rectified spirit, acetone, acetaldehyde, toluene and DCM) | First | 10.7–15.1 | 12.2–14.5 |
0.05, 0.10, 0.15 and 0.20 M NaOH solution | One | 87.5, 98.5, 80.2 and 74.5 | 86.5, 96.2, 84.4 and 70.2 |
Eight | 50.4, 58.4, 53.2 and 45.5 | 50.2, 55.6, 53.7 and 48.7 | |
0.05, 0.10, 0.15 and 0.20 M KOH solution | One | 77.5, 87.5, 71.2 and 65.5 | 90.4, 94.5, 75.5 and 60.5 |
Eight | 41.2, 44.2, 39.5 and 35.4 | 35.5, 39.5, 36.4 and 30.2% | |
0.05 to 0.20 M LiOH solution | First | 65.2–45.5 | 62.2–41.2 |
0.05 to 0.20 M Ca(OH)2 solution | First | 55.4–40.2 | 50.2–35.2 |
0.05 to 0.20 M NaHCO3 solution | First | 35.7–25.5 | 33.5–23.5 |
