Table 3.
Kinetic parameters for the photocatalytic removal of cyanide by UV/ TiO 2 and UV/ZnO with organic compounds (catalyst dosage= 1g/L, pH=7, cyanide= 100 mg/L, organic compounds= 100 mg/L)
|
UV/TiO
2
|
Zero-order |
First-order |
Second-order |
|||
|---|---|---|---|---|---|---|
| Organic Compounds | k 0 (mol L -1 min -1 ) | R 2 | k 1 (min -1 ) | R 2 | k 2 (L mol -1 min -1 ) | R 2 |
| Humic Acid |
0.322 |
0.988 |
0.005 |
0.988 |
0.012 |
0.975 |
| Oxalate |
0.108 |
0.946 |
0.027 |
0.931 |
0.011 |
0.82 |
| Phenol |
0.12 |
0.976 |
0.007 |
0.978 |
0.011 |
0.961 |
| EDTA |
0.253 |
0.986 |
0.006 |
0.995 |
0.001 |
0.979 |
| NTA |
0.297 |
0.98 |
0.006 |
0.989 |
0.002 |
0.986 |
|
UV/ZnO |
Zero-order |
First-order |
Second-order |
|||
|
Organic Compounds |
k
0
(mol L
-1
min
-1
) |
R
2
|
k
1
(min
-1
) |
R
2
|
k
2
(L mol
-1
min
-1
) |
R
2
|
| Humic Acid |
0.298 |
0.984 |
0.004 |
0.981 |
0.001 |
0.972 |
| Oxalate |
0.131 |
0.985 |
0.006 |
0.987 |
0.002 |
0.94 |
| Phenol |
0.154 |
0.965 |
0.006 |
0.993 |
0.011 |
0.986 |
| EDTA |
0.281 |
0.988 |
0.009 |
0.989 |
0.001 |
0.093 |
| NTA | 0.314 | 0.992 | 0.005 | 0.995 | 0.002 | 0.984 |