| AGCG | activated green coffee grounds (activated biocarbon) |
| AGWS | activated green walnut shells (activated biocarbon) |
| AHRoCG | activated high roasted coffee grounds (activated biocarbon) |
| APP | activated potato peelings (activated biocarbon) |
| ATG | activated tea grounds (activated biocarbon) |
| AWS | activated walnut shells (activated biocarbon) |
| CGCG | charred green coffee grounds (biocarbon) |
| CGWS | charred green walnut shells (biocarbon) |
| CHRoCG | charred high roasted coffee grounds (biocarbon) |
| CPP | charred potato peelings (biocarbon) |
| CTG | charred tea grounds (biocarbon) |
| CWS | charred walnut shells (biocarbon) |
| GCG | green coffee grounds (biowaste) |
| GWS | green walnut shells (biowaste) |
| HRoCG | high roasted coffee grounds (biowaste) |
| PP | potato peelings (biowaste) |
| TG | tea grounds (biowaste) |
| WS | walnut shells (biowaste) |
| a | CO2 sorption capacity, mgCO2/gA |
| Lo | average pore diameter, nm |
| Q | theta angle, ° |
| SBET | specific surface area, m2/g |
| t | time, min |
| T | temperature, °C |
| Vp | total pore volume, cm3/g |
| Wo | micropore volume, cm3/g |
| λ | wavenumber, cm−1 |
| Va | volume adsorbed, cm3/g |
| D | pore diameter, nm |
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