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Visible and solar light photocatalytic disinfection of bacteria by N-doped TiO2
Arya Vijayanandan,
Published in IWA Publishing
2014
Volume: 14
   
Issue: 5
Pages: 924 - 930
Abstract
A water treatment system was developed based on a photocatalytic process, employing immobilized N-doped TiO2, which worked under solar radiation. Batch reactor studies were conducted using an immobilized and suspended form of N-doped TiO2. Activities of Degussa P-25 and N-doped TiO2 were compared. Optimization of catalyst concentration was also carried out. Reaction rates under different working conditions were compared. The bacterial kill followed a pseudo first-order reaction. Continuous reactor studies were carried out using N-doped TiO2 coated glass plates. Three-log inactivation of bacteria was obtained after a contact time of 40 min. The effects of turbidity, bicarbonate ions and organic matter were studied. It was found that the efficiency of the system decreased due to these components. Comparison of the performance of solar water-disinfection (SODIS) and solar photocatalytic treatment for disinfection of water was also carried out. The results showed that the suspended catalyst achieved complete inactivation in 1 h compared to SODIS which took 6 h. Bacterial regrowth was observed in the case of SODIS treatment whereas no bacterial growth was observed after solar photocatalytic treatment. © IWA Publishing 2014
About the journal
JournalWater Science and Technology: Water Supply
PublisherIWA Publishing
ISSN16069749
Open AccessNo
Concepts (34)
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    Bacteria
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    Batch reactors
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    CATALYSTS
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    Disinfection
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    Light
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    Reaction rates
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    Titanium dioxide
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    Turbidity
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    Water treatment
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    BACTERIAL REGROWTH
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    CONTINUOUS REACTORS
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    N-DOPED TIO
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    PHOTOCATALYTIC DISINFECTIONS
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    SODIS METHOD
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    Visible light
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    Doping (additives)
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    Bicarbonate
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    Organic matter
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    Anatase
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    Catalysis
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    Growth rate
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    Microbial activity
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    Photochemistry
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    Reaction kinetics
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    Solar radiation
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    Visible spectrum
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    Article
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    Bacterial growth
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    Bactericidal activity
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    Batch reactor
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    Catalyst
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    Concentration (parameters)
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    Photocatalysis
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    Bacteria (microorganisms)