Table 3.
Variation of first order rate constant for COD reduction at different pH and TiO2 concentrations
| Sample | TiO2Concentration (g/L) |
First order rate constant (1/min) |
|||||
|---|---|---|---|---|---|---|---|
| Normal pH | pH = 2 | pH = 4 | pH = 6 | pH = 8 | pH = 10 | ||
|
COD |
0.5 |
0.0029 |
0.0012 |
0.0014 |
0.0019 |
0.0022 |
0.0018 |
|
1 |
0.0035 |
0.0020 |
0.0023 |
0.0031 |
0.0025 |
0.0024 |
|
|
1.5 |
0.0039 |
0.0021 |
0.0026 |
0.0036 |
0.0027 |
0.0027 |
|
|
2 |
0.0040 |
0.0023 |
0.0027 |
0.0038 |
0.0027 |
0.0028 |
|
| R2 | 0.985 | 0.967 | 0.983 | 0.988 | 0.979 | 0.997 | |