Table 3. Estimated Values of the Model Parameters and Their 95% Confidence Intervals.
| model parameter | estimated value | 95% confidence interval (% of value) |
|---|---|---|
| shielding factor Cl– | 8.70 × 10–6 | ±5.55 × 10–7 (6.38%) |
| shielding factor NO3– | 6.50 × 10–7 | ±2.96 × 10–8 (4.55%) |
| kFe3+(mol s–1) | 0.23 × 100 | ±8.23 × 10–4 (0.36%) |
| kCu2+(mol s–1) | 1.73 × 10–12 | ±7.63 × 10–13 (44.12%) |
| kH+(mol s–1) | 1.52 × 100 | ±8.19 × 10–4 (0.05%) |
| kCl–(mol s–1) | 7.04 × 100 | ±0.39 × 10 (5.51%) |
| kNO3–(mol s–1) | 5.54 × 10–4 | ±2.13 × 10–5 (3.84%) |
| θ+ (for nontreated support)a | 46.0% | ±0.253 (0.55%) |
| θ+ (for 3 M HCl-pretreated support) | 91.9% | ±4.43 (4.82%) |
| kFeOnFe (mol s–1) | 7.93 × 10–3 | ±1.45 × 10–3 (13.75%) |
| kCuOnCu (mol s–1) | 1.16 × 10–7 | ±7.97 × 10–8 (68.71%) |
| kFeOnCu (mol s–1) | 6.17 × 10–2 | ±8.22 × 10–4 (1.33%) |
| kCuOnFe (mol s–1) | 1.15 × 10–3 | ±8.18 × 10–5 (7.11%) |
a
θ+ is the fraction of the total surface sites that are positively charged; the fraction of negatively charged surface sites is (1 – θ+).