A high-performance doped photocatalysts for inactivation of total coliforms in superficial waters using different sources of radiation

JOURNAL OF ENVIRONMENTAL MANAGEMENT

卷:177

Article

Turini Claro, Elis Marina^1,2  Bidoia, Ederio Dino²  de Moraes, Peterson Bueno¹ 

[1] Univ Campinas UNICAMP, Dept Technol Environm Sanitat, Fac Technol, R Paschoal Marmo 1888, BR-13484332 Limeira, SP, Brazil

[2] Sao Paulo State Univ UNESP, Dept Biochem & Microbiol, Av 24 A,1515, BR-13506900 Rio Claro, SP, Brazil

关键词: Superficial water treatment;    Heterogeneous photocatalysis;    UV-A LED;    Disinfection;    Si-doped;    N-doped;   

DOI  :  10.1016/j.jenvman.2016.04.033

来源: Elsevier

【 摘 要 】

Photocatalytic water treatment has a currently elevated electricity demand and maintenance costs, but the photocatalytic water treatment may also assist in overcoming the limitations and drawbacks of conventional water treatment processes. Among the Advanced Oxidation Processes, heterogeneous photocatalysis is one of the most widely and efficiently used processes to degrade and/or remove a wide range of polluting compounds. The goal of this work was to find out a highly efficient photocatalytic disinfection process in superficial water with different doped photocatalysts and using three sources of radiation: mercury vapor lamp, solar simulator and UV-A LED. Three doped photocatalysts were prepared, SiZnO, N-SiZnO and F-N-SiZnO. The inactivation efficiency of each synthesized photocatalysts was compared to a TiO2 P25 (Degussa (R)) 0.5 g L-1 control. Photolysis inactivation efficiency was 85% with UV-A LED, which is considered very high, demanding low electricity consumption in the process, whereas mercury vapor lamp and solar simulator yielded 19% and 13% inactivation efficiency, respectively. The best conditions were found with photocatalysts SiZnO, F N SiZnO and N SiZnO irradiated with UV-A LED, where efficiency exceeded 95% that matched inactivation of coliforms using the same irradiation and photocatalyst TiO2. All photocatalysts showed photocatalytic activity with all three radiation sources able to inactivate total coliforms from river water. The use of UV-A LED as the light source without photocatalyst is very promising, allowing the creation of cost-effective and highly efficient water treatment plants. (C) 2016 Elsevier Ltd. All rights reserved.

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