Table 4.
Variation of first order rate constant for COD reduction at different pH and H2O2 concentrations, TiO2 = 1 g/L)
|
Sample |
H2O2Concentration (mL/L) |
First order rate constant (1/min) |
|||||
|---|---|---|---|---|---|---|---|
| Normal pH | pH = 2 | pH = 4 | pH = 6 | pH = 8 | pH = 10 | ||
|
COD |
0 |
0.00347 |
0.00203 |
0.00227 |
0.00313 |
0.00246 |
0.00245 |
|
10 |
0.00439 |
0.00299 |
0.00376 |
0.00365 |
0.00415 |
0.00344 |
|
|
20 |
0.00535 |
0.00329 |
0.00431 |
0.00464 |
0.00486 |
0.00367 |
|
|
30 |
0.00641 |
0.00388 |
0.00505 |
0.00512 |
0.00548 |
0.00441 |
|
|
40 |
0.00755 |
0.00467 |
0.00619 |
0.00507 |
0.00619 |
0.00472 |
|
| R2 | 0.93329 | 0.79809 | 0.85309 | 0.98241 | 0.93757 | 0.80822 | |