Table 4.
Comparison of equilibrium adsorption capacity (Qe), adsorption ratio (q), and equilibrium time (TQe) of various adsorbents toward Ag+ and Hg2+.
| Adsorbents | C0 (mg·L−1) | pH | Qe (mg·g−1) | q (%) | TQe (h) |
|---|---|---|---|---|---|
| Ag+ adsorption | |||||
| PTT (this work) | 200 | 5.7 | 193.1 | 96.8 | 0.33 |
| Activated carbon [30] | 120 | 4.5 | 38.8 | 97 | 5 |
| Thiourea/glutaraldehyde grafted O-carboxymethyl chitosan [36] | 160.5 | 5.0 | 156.32 | 97.4 | 48 |
| Cellulose nanocrystals [55] | 107.8 | 6.39 | 34.4 | 64 | 12 |
| Diethylenetriamine-bridged polysilsesquioxanes [34] | 539.3 | – | 162.9 | 30.2 | 12 |
| NH2-MCM-41 nano porous adsorbent [57] | 300 | 7 | 101.45 | 94.32 | 3 |
| Waste yeast [56] | 100 | 3 | 27.9 | 93 | 1 |
| Silica nanoparticles modified with 3-amino-5-mercapto-1,2,4-triazole [26] | 400 | 5 | 124.52 | 62.3 | 0.33 |
| Silica nanoparticles modified with trithiocyanuric acid [21] | 500 | 5.0 | 80 | 32 | 0.5 |
| Hg2+ adsorption | |||||
| PTT (this work) | 200 | 4.6 | 186.9 | 94.8 | 0.33 |
| Poly(hydroxyethylmethacrylate/chitosan) membranes [58] | 400 | 5.0 | 68.8 | – | 0.75 |
| Poly(2-hydroxyethylmethacrylate) gel beads modified with poly(ethyleneimine) [32] | 300 | 5.0 | 335 | – | 1.0 |
| Dithiocarbamate-anchored polymer/organosmectite composites [59] | 400 | 6.0 | 157.3 | – | 1.0 |
| Fe3O4@Zn(btb) nanospheres [60] | 200 | 8 | 129.87 | 64.93 | 0.5 |
| Cross-linked magnetic chitosan-phenylthiourea [61] | 200 | 5 | 135 | 67.50 | 3 |
| Poly(1-amino-5-chloroanthraquinone) [18] | 100.3 | 6 | 83.25 | 83 | 2 |
| Wool-grafted-poly(cyano-acetic acid α-amino-acrylichydrazide) (wool-g-PCAH) chelating fibers [35] | 100 | 5 | 154.32 | 93.3 | 1.5 |
| Modified poly(ethylene terephthalate) chelating fibers [33] | 150 | 5 | 120.02 | 80.01 | 0.83 |