Table 2. Different CS-based aerogels for heavy metals adsorptiona.
| Aerogel | Heavy metal | Initial concentration mg L−1 | pH | Adsorption capacity mg g−1 | Removal % | References |
|---|---|---|---|---|---|---|
| CS/silica | Cd(ii) | 200 | 3 | 64.74 | 96.84 | 83 |
| CS/NFC | Pb(ii) | 150 | — | 252.6 | 85 | 84 |
| AG/ME/CS | Pb(ii) | 2000 | 5.5 | 1331.6 | 95 | 85 |
| CS/AG/MC | Cr(vi) | 400 | 3.1 | 62.4 | 75 | 56 |
| SM/CS | Cu(ii) | 200 | 6 | 81.15 | — | 57 |
| Pb(ii) | 5 | 38.87 | ||||
| Cd(ii) | 6 | 38.15 | ||||
| β-CD-CS@HMTA | Cr(vi) | 100 | 2 | 333.8 | — | 60 |
| CS-PDA | Cr(vi) | 100 | 2 | 374.4 | 80 | 62 |
| Pb(ii) | 5.5 | 441.2 | ||||
| PDA@CNT/CS | As(v) | 150 | 7 | 39 | 93.6 | 86 |
| HPS | Cu(ii) | 200 | 5 | 59.21 | — | 54 |
| PCCSA | Cu(ii) | 240 | 6 | 175.56 | 96.9 | 87 |
a
NFC: nanofibrillated cellulose; PDA: polydopamine; CS: chitosan; CNT: carbon nanotube; β-CD: β-cyclodextrin; HMTA: hexamethylenetetramine; AG: alginate; ME: melamine; HPS: high-strength chitosan; MC: modified clay composite; PCCSA: polyethyleneimine-modified carboxymethyl chitosan aerogel; SM: sulfhydryl modified.