Bacterial disinfection in a sunlight/visible-light-driven photocatalytic reactor by recyclable natural magnetic sphalerite
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AbstractA 5-L reactor was designed and used to enhance the sunlight/visible-light-driven (VLD) photocatalytic disinfection efficiency towards Gram-negative bacterium (Escherichia cob). Natural magnetic sphalerite (NMS) was used as the photocatalyst, which could be easily recycled by applying a magnetic field. Results showed that NMS with irradiation by the blue light emitting diode (LED) lamp could completely inactivate 1.5 x 10(5) cfu/mL of E. coli within 120 min in the first three runs. However, the inactivation efficiency of E. coli started to decrease in the 4th Run, while in the 5th run, the E. coli with the initial concentration of 5 logs was inactivated to 33 (blue-light) and 3.5 logs (sunlight), respectively. Moreover, the stability and deactivation mechanism of NMS during subsequent runs were also studied: The results showed that the decline of the photocatalytic activity was possibly attributed to adsorption of the bacterial decomposed compounds on the active sites. In addition, photocatalytic bactericidal mechanism of the NMS in the photocatalytic system was investigated by using multiple scavengers to remove the specific reactive species. Moreover, various Gram-positive bacteria including Staphylococcus aureus, Microbacterium barkeri, and Bacillus subtilis could also be efficiently inactivated in the photocatalytic system. (C) 2016 Elsevier. Ltd. All rights reserved.
All Author(s) ListPeng XX, Ng TW, Huang GC, Wang WJ, An TC, Wong PK
Journal nameChemosphere
Year2017
Month1
Volume Number166
PublisherPERGAMON-ELSEVIER SCIENCE LTD
Pages521 - 527
ISSN0045-6535
LanguagesEnglish-United Kingdom
KeywordsBacterial disinfection; Disinfection reactor; Natural magnetic sphalerite; Sunlight/visible-light
Web of Science Subject CategoriesEnvironmental Sciences; Environmental Sciences & Ecology

Last updated on 2020-15-08 at 03:40