Table 1.
Visible-Light-Driven CO2 Reduction by CODH/AgNCs-PMAA/TiO2 Assemblies under Different Conditions
| COb (μmol h−1) | TOFc (s−1) | |
|---|---|---|
| standard conditiona | 36.12 ± 3.05 | 20 ± 2 |
| Enzyme | ||
| 0.25 nmol | 15.43 ± 2.52 | 17 ± 3 |
| 0.5 nmol | 36.12 ± 3.05 | 20 ± 2 |
| 1 nmol | 70.33 ± 5.55 | 19 ± 3 |
| AgNCs-PMAA/TiO2 Materials | ||
| 1 mg/mL | 36.12 ± 3.05 | 20 ± 2 |
| 2 mg/mL | 37.78 ± 4.10 | 21 ± 2 |
| 5 mg/mL | 35.03 ± 2.22 | 19 ± 1 |
| Temperature | ||
| 25 °C | 36.12 ± 3.05 | 20 ± 2 |
| 37 °C | 51.23 ± 2.32 | 28 ± 1 |
| 50 °C | 66.75 ± 4.85 | 37 ± 3 |
| pH | ||
| 6 | 36.12 ± 3.05 | 20 ± 2 |
| 7 | 33.72 ± 5.20 | 19 ± 3 |
| Control Group | ||
| AgNCs-PMAA/TiO2 | 0.34 ± 0.20 | Nd |
| CODH/TiO2 | 1.07 ± 0.52 | 0.06 ± 0.01 |
| CODH/AgNCs-PMAA | 11.36 ± 0.22 | 6 ± 0.3 |
| Electron Donor | ||
| TEOA | 30.37 ± 2.58 | 17 ± 1 |
| TEOA + EDTA | 36.12 ± 3.05 | 20 ± 2 |
| MESe | 23.33 ± 2.22 | 13 ± 1 |
Unless otherwise noted in the table, standard conditions were employed, which were as follows: CODH (50 μL of 10 μM solution) was added to a 5 mL dispersion of AgNCs-PMAA/TiO2 (5 mg, composed of 3.05 mg of TiO2 and 1.95 mg of AgNCs-PMAA, with Ag/Ti atom ratio of 0.27) in 0.1 M triethanolamine (TEOA), 25 mM ethylenediaminetetraacetic acid (EDTA), and 0.1 M NaCl at pH 6 and 25 °C. Irradiation was carried out with a Newport 67005 arc lamp (300 W) fitted with a 420 nm filter and located 5 cm from the solution.
CO production rate (μmol of CO h−1) based on the first hour of irradiation.
Turnover frequency (TOF) expressed as molecules of CO produced per second per molecule of CODH).
Value below 0.001 s−1.
2-(N-Morpholino)ethanesulfonic acid (MES).