Table 3 Comparison of the catalytic activities of green-synthesized AuNPs in the 4-NP reduction reaction
From: Catalytic reduction of 4-nitrophenol with gold nanoparticles synthesized by caffeic acid
Entry | Reducing agent used for synthesis of AuNPs | Particle size (nm) | Shape | Rate constant (s-1) | 4-NP (mM)a | NaBH4 (mM)a | Au atoms (mM)a,b | Refs |
|---|---|---|---|---|---|---|---|---|
1 | Caffeic acid (cf-CA-AuNPs) | 38.61 ± 6.21 | Spherical | 5.73 × 10-3 | 0.1 | 10 (100 equiv.) | 0.05 (0.5 equiv.) | In the present study |
2 | Punica granatum juice | 23.1–35.8 | Spherical | 3.67 × 10-3 | 0.05 | 15 (300 equiv.) | 0.0135 (0.27 equiv.) | [24] |
3 | Saraca indica bark extract | 17.97 | Spherical | 4.83 × 10-3 | 0.05 | 15 (300 equiv.) | 0.021 (0.42 equiv.) | [25] |
4 | Aerva lanata leaf extract | 18.62 | Spherical | 2.78 × 10-3 | 0.053 | 10 (189 equiv.) | 0.1383 (2.61 equiv.) | [26] |
5 | Prunus domestica extract | 20 ± 6 | Spherical | 1.90 × 10-3 | 0.094 | 11.268 (120 equiv.) | 0.019 (0.2 equiv.) | [27] |
6 | catechin | 16.6 | Diverse shapes | 1.52 × 10-3 | 0.034 | 2.269 (67 equiv.) | 0.075 (2.22 equiv.) | [28] |
7 | Bupleurum falcatum root extract | 10.5 ± 2.3 | Spherical | 0.82 × 10-3 | 0.07 | 7 (100 equiv.) | 0.1 (1.43 equiv.) | [29] |