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| adsorbent | adsorption capacity (mg/g) | reference |
|---|---|---|
| fly ash | 5.18 | (55) |
| fly ash | 5.57 | (56) |
| fly ash | 0.12 | (57) |
| steel converter slag | 1.15 | (58) |
| electrical arc furnace slag | 9.62 | (59) |
| oil palm frond microcrystalline cellulose | 12.85 | (60) |
| almond-shell-activated carbon | 1.33 | (61) |
| activated date pits | 12.90 | (56) |
| neem leaves | 8.76 | (62) |
| orange peel | 18.60 | (63) |
| raw RHA | 3.51 | this work |
| treated RHA | 8.59 | this work |
