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Photocatalytic water disinfection by simple and low-cost monolithic and heterojunction ceramic wafers

Makwana, NM; Hazael, R; McMillan, PF; Darr, JA; (2015) Photocatalytic water disinfection by simple and low-cost monolithic and heterojunction ceramic wafers. Photochemical & Photobiological Sciences , 14 (6) pp. 1190-1196. 10.1039/c5pp00002e. Green open access

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Abstract

In this work, the photocatalytic disinfection of Escherichia coli (E. coli) using dual layer ceramic wafers, prepared by a simple and low-cost technique, was investigated. Heterojunction wafers were prepared by pressing TiO2 and WO3 powders together into 2 layers within a single, self-supported monolith. Data modelling showed that the heterojunction wafers were able to sustain the formation of charged species (after an initial "charging" period). In comparison, a wafer made from pure TiO2 showed a less desirable bacterial inactivation profile in that the rate decreased with time (after being faster initially). The more favourable kinetics of the dual layer system was due to superior electron-hole vectorial charge separation and an accumulation of charges beyond the initial illumination period. The results demonstrate the potential for developing simplified photocatalytic devices for rapid water disinfection.

Type: Article
Title: Photocatalytic water disinfection by simple and low-cost monolithic and heterojunction ceramic wafers
Location: England
Open access status: An open access version is available from UCL Discovery
DOI: 10.1039/c5pp00002e
Publisher version: http://dx.doi.org/10.1039/c5pp00002e
Language: English
Additional information: This article is licensed under a Creative Commons Attribution 3.0 Unported Licence.
UCL classification: UCL
UCL > Provost and Vice Provost Offices > UCL BEAMS
UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Maths and Physical Sciences
UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Maths and Physical Sciences > Dept of Chemistry
URI: https://discovery.ucl.ac.uk/id/eprint/1474797
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