Table 1 Keywords information in biochar adsorption for wastewater treatment
Ranking | Number of nodes | Mean contour value | Average year | Main content | ||
|---|---|---|---|---|---|---|
0 | 33 | 0.881 | 2012 | Magnetic biochar | Graphene oxide | Pb(II) |
1 | 27 | 0.931 | 2012 | Tetracycline | Hexavalent chromium | Nanoparticle |
2 | 22 | 0.964 | 2012 | Heavy metal | Cadmium | Zinc |
3 | 21 | 0.981 | 2012 | Degradation | Dye | Desorption |
4 | 21 | 0.91 | 2011 | Adsorbent | Methylene blue | Kinetics |
5 | 19 | 0.955 | 2012 | Temperature | Behavior | Steam |
6 | 17 | 0.98 | 2012 | Biochar | Charcoal | Organic matter |
7 | 16 | 0.92 | 2012 | Biosorption | Crop residue | Slow pyrolysis |
8 | 12 | 0.915 | 2012 | Adsorption | Mechanism | Copper |
9 | 12 | 0.966 | 2012 | Pyrolysis | Nitrogen | Manure |