Table 2.
Comparison of adsorption capacity of various adsorbent for Pb2+, Cu2+, and Cd2+.
| Adsorbent | Heavy Metals (Adsorbate) | Maximum Adsorption Capacity (mg/g) | Year of Publication | Reference |
|---|---|---|---|---|
| Amino functionalized mesoporous silica | Pb2+, Ni2+, Cd2+ | 57.7 (Pb2+), 12.4 (Ni2+), 18.3 (Cd2+) | 2009 | [25] |
| Nano-alumina | Pb2+, Cr3+, Cd2+ | 100.0 (Pb2+), 100.0 (Cr3+), 83.3 (Cd2+) | 2010 | [26] |
| Amino functionalized magnetic graphenes composite | Pb2+, Hg2+, Cr6+, Cd2+ | 28.0 (Pb2+), 23.0 (Hg2+), 17.3 (Cr6+), 27.8 (Cd2+) | 2014 | [27] |
| Polydopamine microspheres | Pb2+ | 165.8 | 2017 | [28] |
| Polyving alcohol/polyacrylic acid double network gel | Pb2+, Cd2+ | 195.0 (Pb2+), 115.9 (Cd2+) | 2015 | [29] |
| Biochar-alginate capsule | Pb2+ | 263.2 | 2013 | [30] |
| Polyaniline/calcium alginate composite | Pb2+, Cu2+ | 357.0 (Pb2+), 79.0 (Cu2+) | 2012 | [31] |
| Silica modified calcium alginate-xanthan gum hybrid bead composite | Pb2+ | 18.9 | 2013 | [32] |
| Activated carbon-calcium alginate composite | Pb2+ | 15.7 | 2016 | [33] |
| Alginate-SBA-15 composite | Pb2+ | 222.2 | 2013 | [34] |
| Soy protein hollow microspheres | Pb2+, Zn2+, Cr3+, Cd2+, Cu2+, Ni2+ | 235.6 (Pb2+), 255.0 (Zn2+), 52.9 (Cr3+), 120.8 (Cd2+), 115.0 (Cu2+), 177.1 (Ni2+) | 2013 | [35] |
| Magnetic alginate beads | Pb2+ | 50 | 2012 | [36] |
| γ-Fe2O3 nanoparticles | Pb2+, Cu2+ | 69.0 (Pb2+), 34.0 (Cu2+) | 2017 | [37] |
| Magnetic chitosan/graphene oxide imprinted Pb2+ | Pb2+ | 79.0 | 2016 | [37] |
| Chitosan coated calcium alginate | Pb2+ | 106.9 | 2016 | [39] |
| Hydroxyapatite/chitosan porous material | Pb2+ | 264.4 | 2015 | [40] |
| Calcite-poly(ethyleneimine) nanostructured rod | Pb2+ | 240 | 2013 | [41] |
| Nanostructured vaterite-poly(ethyleneimine) hybrid | Pb2+ | 2762 | 2014 | [42] |
| Alginate-melamine hybrid | Pb2+ | 287.7 | 2018 | [43] |
| mp-CA/GO | Pb2+, Cu2+, Cd2+ | 368.2 (Pb2+), 98.1 (Cu2+), 183.6 (Cd2+) | This work | This work |