Table 6.
The results of adsorption/desorption of the studied pollutants onto/from MgAl-LDH@SiO2 (Ci = 1 mg L−1, Qdes = 0.50 cm3 min−1; mads ~ 0.40 g) using 3.0 and 1 dm3 of 1 wt.% NaOH/2 wt.% NaCl for dyes and Cr(VI) desorption, respectively.
| Pollutants | Adsorption (mg g−1) * |
Desorption (mg g−1) * | Desorption Efficiency (%) | C (mg dm−3) ** | Δq, (mg g−1) *** | Σ *** | |
|---|---|---|---|---|---|---|---|
| I | Cr(VI) | 71.3 | 70.1 | 98.2 | 28.1 | 1.3 | 13.5 |
| III | 63.3 | 61.0 | 96.4 | 24.4 | 2.3 | ||
| V | 48.1 | 44.9 | 93.4 | 17.9 | 3.2 | ||
| I | AB-225 | 204.1 | 198.3 | 97.2 | 26.4 | 5.7 | 43.9 |
| III | 189.1 | 179.8 | 95.1 | 23.9 | 9.3 | ||
| V | 168.9 | 157.7 | 93.4 | 21.1 | 11.2 | ||
| I | AV-109 | 189.8 | 181.8 | 95.8 | 24.3 | 7.9 | 48.6 |
| III | 175.5 | 166.5 | 94.9 | 22.2 | 8.9 | ||
| V | 168.2 | 156.1 | 92.8 | 20.8 | 12.1 | ||
| I | AG-40 | 374.2 | 368.2 | 98.4 | 49.1 | 5.9 | 52.9 |
| III | 357.9 | 347.8 | 97.2 | 46.4 | 10.1 | ||
| V | 332.4 | 317.2 | 95.4 | 42.3 | 15.3 |
* Adsorbed and desorbed pollutants; ** concentration of the pollutant in effluent water; *** quantity of the irreversibly bonded pollutants in the 1st, 3rd, and 5th cycles, and overall for five cycles, respectively.