Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
4990193 | Separation and Purification Technology | 2017 | 11 Pages |
Abstract
To enhance the catalytic potential of ZnO in the UV-LED photocatalytic process, ZnO was doped with C, N, and S nonmetals. The doped ZnO was characterized, and its photocatalytic potential was compared with plain ZnO for the degradation and mineralization of diazinon. The characterization analysis of the powder prepared at the calcination temperature of 500 °C indicated the production of a mesoporous cns-doped ZnO (cns-ZnO) with a specific surface area of 4.74 m2/g and crystallite size of 21.4 nm. Photocatalytic experiments were carried out under different experimental conditions. The cns-ZnO prepared at a calcination temperature of 500 °C showed the highest photocatalytic potential of 53.4% for the removal of diazinon at a reaction time of 100 min. The degradation and mineralization rate constants of diazinon in the cns-ZnO/LED process were 0.434 hâ1 and 0.202 hâ1, respectively; the degradation rate constant of diazinon in ZnO/LED process was 0.0054 hâ1. The results of bioassay analysis showed that the cns-ZnO/LED process could reduce the final photoluminance inhibition of the diazinon by 46.4%. The electrical energy needed for one log reduction in the diazinon concentration in the cns-ZnO/LED process was 180.6 kW/m3 that is less than that of the conventional photocatalytic process using UV/ZnO with mercury lamps as radiation source. Accordingly, cns-ZnO is a promising catalyst, which is efficiently activated with UV-LED lamps for the advanced oxidation of emerging water contaminates.
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Physical Sciences and Engineering
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Authors
Hiwa Hossaini, Gholamreza Moussavi, Mehrdad Farrokhi,