Influence of the pH-value on the photocatalytic disinfection of bacteria with TiO2 – Explanation by DLVO and XDLVO theory

Schwegmann, Heiko; Ruppert, Johannes; Frimmel, Fritz H.

doi:10.1016/j.watres.2012.11.030

Cited by 72 publications

(35 citation statements)

References 51 publications

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“…In photocatalytic bacterial inactivation process, a shoulder can be reasoned by a cumulative damage through the photocatalytic reactions before the proliferation of a single cell is inhibited. 40 The fitted parameters of the shoulder length S for B001 and B010 nanosheets are 0. 23 …”

Section: Visible-light-driven (Vld) Photocatalytic Bacterial Inactivamentioning

confidence: 99%

Visible-light-driven BiOBr nanosheets for highly facet-dependent photocatalytic inactivation of Escherichia coli

Wang

et al. 2015

J. Mater. Chem. A

173

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Section: Visible-light-driven (Vld) Photocatalytic Bacterial Inactivamentioning

confidence: 99%

Visible-light-driven BiOBr nanosheets for highly facet-dependent photocatalytic inactivation of Escherichia coli

Wang

et al. 2015

J. Mater. Chem. A

173

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“…The XDLVO theory was used to model the interaction between bacterial cells and TiO 2 nanoparticles. This theory considers the total energy of adhesion to be the sum of the electrostatic double layer (EL) interaction energy, the Lifshitz-van der Waals (LW) interaction energy, and the Lewis acid-base (AB) (i.e., hydrophobic) interaction energy (36)(37)(38)(39). Details of these procedures are described in the supplemental material.…”

Section: Fig 1 Schematic Illustration Of the Photocatalytic Inactivatmentioning

confidence: 99%

Dual Roles of Capsular Extracellular Polymeric Substances in Photocatalytic Inactivation of Escherichia coli: Comparison of E. coli BW25113 and Isogenic Mutants

Huang

Xia

et al. 2015

Appl Environ Microbiol

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The dual roles of capsular extracellular polymeric substances (EPS) in the photocatalytic inactivation of bacteria were demonstrated in a TiO2-UVA system, by comparing wild-typeEscherichia colistrain BW25113 and isogenic mutants with upregulated and downregulated production of capsular EPS. In a partition system in which direct contact between bacterial cells and TiO2particles was inhibited, an increase in the amount of EPS was associated with increased bacterial resistance to photocatalytic inactivation. In contrast, when bacterial cells were in direct contact with TiO2particles, an increase in the amount of capsular EPS decreased cell viability during photocatalytic treatment. Taken together, these results suggest that although capsular EPS can protect bacterial cells by consuming photogenerated reactive species, it also facilitates photocatalytic inactivation of bacteria by promoting the adhesion of TiO2particles to the cell surface. Fluorescence microscopy and scanning electron microscopy analyses further confirmed that high capsular EPS density led to more TiO2particles attaching to cells and forming bacterium-TiO2aggregates. Calculations of interaction energy, represented by extended Derjaguin-Landau-Verwey-Overbeek (XDLVO) potential, suggested that the presence of capsular EPS enhances the attachment of TiO2particles to bacterial cells via acid-base interactions. Consideration of these mechanisms is critical for understanding bacterium-nanoparticle interactions and the photocatalytic inactivation of bacteria.

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“…Moreover, TiO 2 NPs have shown a strong tendency to attach onto biocolloids (e.g. bacteria, viruses) (Chowdhury et al, 2012;Schwegmann et al, 2013;Gentile and Fidalgo de Cortalezzi, 2016), and have demonstrated to have antimicrobial properties in the presence of light (photocatalysis) (Li et al, 2008;Schwegmann et al, 2013). However, it is worthy to note that the transport of human adenoviruses in the presence of clay colloids and TiO 2 NPs in the subsurface is not fully understood.…”

Section: Introductionmentioning

confidence: 99%

Cotransport of human adenoviruses with clay colloids and TiO2 nanoparticles in saturated porous media: Effect of flow velocity

Syngouna

Chrysikopoulos

Kokkinos

et al. 2017

Science of The Total Environment

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Influence of the pH-value on the photocatalytic disinfection of bacteria with TiO2 – Explanation by DLVO and XDLVO theory

Cited by 72 publications

References 51 publications

Visible-light-driven BiOBr nanosheets for highly facet-dependent photocatalytic inactivation of Escherichia coli

Visible-light-driven BiOBr nanosheets for highly facet-dependent photocatalytic inactivation of Escherichia coli

Dual Roles of Capsular Extracellular Polymeric Substances in Photocatalytic Inactivation of Escherichia coli: Comparison of E. coli BW25113 and Isogenic Mutants

Cotransport of human adenoviruses with clay colloids and TiO2 nanoparticles in saturated porous media: Effect of flow velocity

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