Table 1 Rate constants for the laccase-like reactions of different manganese oxide nanomaterials with ABTS as the substrate.
Types | pH | K m (mM) | v max (M s−1) | k cat/K m (M−1 s−1) | k cat (s−1) | k O2 (M s−1) | k 3 (M−1 s−1) | k 5 (M−1/4 s−1) | k Mn(II) (M s−1) |
|---|---|---|---|---|---|---|---|---|---|
α-MnO2 | 6.0 | 1.97 | 1.68 × 10−7 | 0.2534 | 4.99 × 10−4 | 9.86 × 10−11 | 503 | 4.58 × 10−6 | 1.34 × 10−8 |
β-MnO2 | 6.0 | 4.54 | 1.34 × 10−7 | 0.0876 | 3.98 × 10−4 | 4.89 × 10−11 | 401 | 4.22 × 10−6 | 7.24 × 10−8 |
γ-MnO2 | 6.0 | 2.25 | 1.49 × 10−6 | 1.9648 | 4.42 × 10−3 | 1.82 × 10−10 | 4452 | 4.71 × 10−6 | 2.42 × 10−7 |
δ-MnO2 | 6.0 | 1.24 | 5.14 × 10−7 | 1.2313 | 1.53 × 10−3 | 1.48 × 10−11 | 1542 | 4.52 × 10−7 | 2.05 × 10-7 |
ε-MnO2 | 6.0 | 1.86 | 9.98 × 10−7 | 1.5937 | 2.97 × 10−3 | 6.42 × 10−11 | 2991 | 1.85 × 10−6 | 2.17 × 10−7 |
Mn3O4 | 6.0 | 2.22 | 2.19 × 10−7 | 0.2922 | 6.50 × 10−4 | 3.42 × 10−11 | 655 | 1.15 × 10−6 | 1.86 × 10−7 |
