Table 2.
Kinetic parameters for the photocatalytic removal of cyanide by UV/TiO 2 and UV/ZnO at different initial cyanide concentration (catalyst dosage = 1g/L, pH=7)
| UV/TiO 2 CN (mg/L) |
Zero-order |
First-order |
Second-order |
|||
|---|---|---|---|---|---|---|
| k 0 (mol L -1 min -1 ) | R 2 | k 1 (min -1 ) | R 2 | k 2 (L mol -1 min -1 ) | R 2 | |
| 50 |
0.490 |
0.798 |
0.008 |
0.919 |
0.001 |
0.978 |
| 100 |
0.276 |
0.688 |
0.006 |
0.815 |
0.002 |
0.918 |
| 200 |
0.586 |
0.623 |
0.005 |
0.67 |
0.001 |
0.718 |
|
UV/ZnO CN (mg/L) |
Zero-order |
First-order |
Second-order |
|||
|
k
0
(mol L
-1
min
-1
) |
R
2
|
k
1
(min
-1
) |
R
2
|
k
2
(L mol
-1
min
-1
) |
R
2
|
|
| 50 |
0.122 |
0.903 |
0.007 |
0.959 |
0.002 |
0.988 |
| 100 |
0.677 |
0.927 |
0.006 |
0.996 |
0.002 |
0.985 |
| 200 | 0.26 | 0.987 | 0.011 | 0.983 | 0.001 | 0.983 |