Table 7.
Comparison of different adsorbents.
| Adsorbents | Pollutants | Adsorption conditions | qm (mg/g) | Reusability | Costs | References |
|---|---|---|---|---|---|---|
| Metakaolin geopolymers | Cu(II) | pH = 5.5, dosage = 0.2 g/L, t = 120 min, C0 = 100 mg/L | 97.67 mg/g | 5 cycles | Not given | Yu et al.58, |
| Coal gangue and red mud geopolymers | Pb(II) | pH = 5, dosage = 0.6 g/L, t = 200 min, C0 = 140 mg/L | 137.7 mg/g | 5 cycles | Not given | Wang59, |
| CFA/steel slag geopolymers | MB | pH = 7, dosage = 3 g/L, t = 240 min | 33.30 mg/g | 3 cycles | Not given | Yan60, |
| Cu(II) | pH = 5, dosage = 4 g/L, t = 420 min | 24.15 mg/g | 3 cycles | |||
| Coal gangue/fly ash porous geopolymers | MB | pH = 6, dosage = 1 g/L, t = 300 min, C0 = 200 mg/L | 35.60 mg/g | 5 cycles | 0.30 $/kg | Fang et al.16, |
| Pb(II) | 98.31 mg/g | |||||
| Cu(II) | 85.67 mg/g | |||||
| Activated carbon | Pb(II) | Not given | 120 mg/g | Not given | 36.62 $/kg | Qi61, |
| Coal fly ash porous geopolymers | MB | pH = 10, dosage = 0.9 g/L, t = 90 min, C0 = 100 mg/L | 65.85 mg/g | 4 cycles | 0.154 $/kg | This work |
| Pb(II) | pH = 5, dosage = 0.4 g/L, t = 60 min, C0 = 150 mg/L | 264.55 mg/g |