Table 1 Nanoparticle size, zeta-potential and ionic metal concentration determined in TAPx4 medium at a concentration of 20 mg/L. Size and zeta-potential are presented ±standard deviation
NPs | Size (nm) | Zeta (ζ) potential (mV) | Ionic metal (μg/L) |
|---|---|---|---|
Au | 42 ± 0.3 | − 24.4 ± 0.8 | 6 |
Pt | 12 ± 0.3 | − 9.1 ± 2.4 | 36 |
Ag | 5 ± 0.2 | − 5.04 ± 2.3 | 33 |
Pd | 1.5 ± 0.2 | − 21.9 ± 2.3 | 7 |
CuO | 180 ± 0.3 | − 28.6 ± 0.9 | 35 |