Table 2 Comparison of maximum adsorption capacities for heavy metals on some adsorbents.
Biomass/waste name | Activated agent | Created as adsorbent | Adsorbate | Max.adsorption capacity (mg g−1) | References |
|---|---|---|---|---|---|
Green waste tea residue | No any activating agent | Without activation | Cu2+ and Ni2+ | 15.6 and 15.9 | Present work |
Sewage sludge | ZnCl2 | Activated | Cu, Zn, and Al | 15.58, 24.09 and 27.70 | |
Bamboo SM1 SM2 | No any activating agent | Activated | Cu(II), Cd(II) and Pb(II) | 0.4, 0.17 and 0.40 0.4, 0.25 and 0.39 | |
Pistachio shell | Fe3O4 NPs@AC@SO3H | Activated | Pb(II), As(III) and Cd(III) | 147.05, 151.51 and 119.04 | |
Sugarcane | ZnCl2 | activated | Cu2+, Ni2+ and Pb2+ | 2.99, 13.24 and 19.3 | |
Coconut shell | H3PO4 | Activated | Cd(II) | 33.71 | |
Vegetable wastes | H2SO4, H3PO4 and NH4NO3 | Activated | Cd2+, Ni2+ and Zn2+ | 4.97, 3.29 and 3.07 | |
Sand | α-Fe2O3 | Coated | Cu(II) | 3.93 | |
Sugarcane Bagasse | H3PO4 | Activated | Hg | 107.7 |
