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Indian Journal of Chemical Technology (IJCT) >
IJCT Vol.18 [2011] >
IJCT Vol.18(3) [May 2011] >
| Title: | Solar photocatalytic detoxification of cyanide with bacterial disinfection by oxide ceramics |
| Authors: | Karunakaran, C
Gomathisankar, P
Manikandan, G |
| Keywords: | Photocatalysis
Semiconductor
Charge-transfer resistance
Capacitance
Bactericidal activity |
| Issue Date: | May-2011 |
| Publisher: | NISCAIR-CSIR, India |
| Abstract: | Under natural sunlight
(975±25 Wm-2), CeO2 catalyzes the oxidation of cyanide to
cyanate in alkaline medium and the photokinetic behaviour of the reaction is
similar to those on TiO2 and ZnO surfaces; the oxidation follows the
Langmuir-Hinshelwood kinetics on cyanide ion, and depends on the area of the
catalyst bed and dissolved oxygen. However, the adsorption of cyanide on the
oxides in dark is too small to be measured analytically and detected
spectroscopically. Although the photocatalytic efficiencies under identical
solar irradiance are of the order: CeO2 < ZnO < TiO2,
which is in accordance with the charge-transfer resistance and capacitance of
the oxides, CeO2 and ZnO show bactericidal activity as well. At a
loading of 0.8 gL-1 they inactivate 40 and 44% of 2.5 × 1012
CFU mL-1 E. coli in 30 min
even without direct light. |
| Page(s): | 169-176 |
| CC License: |  CC Attribution-Noncommercial-No Derivative Works 2.5 India |
| ISSN: | 0975-0991 (Online); 0971-457X (Print) |
| Source: | IJCT Vol.18(3) [May 2011]
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