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Juan Kiwi

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Publications associées (117)

Structure and performance of a novel TiO2-phosphonate composite photocatalyst

Juan Kiwi

An innovative SiO2-PO43--TiO2 photocatalyst is presented which is able to bond TiO2 to Raschig rings (RR). Evidence for the formation on the catalyst surface of P = O stretching bands near 1200-1250 cm(-1) is presented by FTIR spectroscopy. The TiO2 Deguss ...

2008

Escherichia coli inactivation by N, S co-doped commercial TiO2 powders under UV and visible light

Juan Kiwi, César Pulgarin, Nikola Castillo, Julian Andrés Rengifo Herrera

2008

Highly dispersed PTFE/Co3O4 flexible films as photocatalyst showing fast kinetic performance for the discoloration of azo-dyes under solar irradiation

Michaël Bensimon, Juan Kiwi, Lioubov Kiwi, Albert Renken, Danièle Laub

Small nanosized clusters of Co3O4 coated on PTFE (polytetrafluoroethylene) flexible film is reported as a novel supported photocatalyst effective in the fast discoloration of the azo-dye Orange II under simulated solar radiation in the presence of oxone (2 ...

2007

Preparation, stabilization and characterization of TiO2 on thin polyethylene films (LDPE): Photocatalytic applications

Philippe Buffat, Juan Kiwi, Lioubov Kiwi, Andrzej Kulik, Albert Renken, Danièle Laub, Kyumin Lee

An innovative way to fix preformed nanocrystalline TiO2 on low-density polyethylene film (LDPE-TiO2) is presented. The LDPE-TiO2 film was able to mediate the complete photodiscoloration of Orange II using about seven times less catalyst than a TiO2 suspens ...

2007

Erratum to “Preparation, stabilization and characterization of TiO2 on thin polyethylene films (LDPE). Photocatalytic applications"

Philippe Buffat, Juan Kiwi, Lioubov Kiwi, Andrzej Kulik, Albert Renken, Danièle Laub, Kyumin Lee

2007

ZnSO4-TiO2 Doped Catalyst with Higher Activity in Photoctalytic

Michaël Bensimon, Juan Kiwi, Lioubov Kiwi, Danièle Laub, Victor Sarria

2007

Elargissement du spectre d'absorption vers le visible de poudres commerciales de TiO2 par dopage par N, S, C. Préparation, caractérisation et activité photocatalytique antibactérienne

Juan Kiwi, César Pulgarin, Nikola Castillo, Julian Andrés Rengifo Herrera

2007

Stabilization mechanism of TiO2 on flexible fluorocarbon films as a functional photocatalyst

Juan Kiwi, Lioubov Kiwi, Albert Renken, Danièle Laub

The repetitive discoloration kinetics of the azo-dye Methyl Orange (taken as a model organic compound) was followed under solar simulated radiation (90 mW/cm2) to assess the performance of the TiO2/Tedlar® composite photocatalyst. The influence of solution ...

2006

Catalytic activity of commercial of TiO2 powders for the abatement of the bacteria (E. coli) under solar simulated light: Influence of the isoelectric point

Paul Bowen, Juan Kiwi, César Pulgarin, Damien Gumy, Carlos Morais, Rita Hajdu Schenk

Thirteen different commercial TiO2 powders with specific surface areas varying from 9 to 335 m/g and with isoelectric points (IEP) from 3 to 7.5 were investigated for their catalytic activity in E. coli inactivation. The TiO2 samples zeta potential, attenu ...

2006

Performance and characterization of Ag-cotton and Ag/TiO2 loaded textiles during the abatement of E. coli

Juan Kiwi, Hans Jörg Mathieu, César Pulgarin, Danièle Laub

The bacterial inactivation of Escherichia coli on Ag–cotton textiles were investigated under different experimental conditions with novel Ag-nanoparticles fixed on cotton textiles. The evaluation of the bactericide performance of the Ag–cotton was compared ...

2006

Laser kinetic spectroscopy of the interfacial charge transfer between membrane cell walls of E. coli and TiO2

Juan Kiwi, César Pulgarin, Damien Gumy

This laser kinetics features of the electron decay of TiO2 in the presence of the Escherichia coli (E. coli) phosphatidyl-ethanolcholine (PE) and lipo-polysaccharides (LPS) cell wall components were are reported in this study. The interaction of the biomol ...

2006

Photocatalytic Storing of O2 as H2O2 Mediated by High Surface Area CuO. Evidence for a Reductive-Oxidative Interfacial Mechanism

Paul Bowen, Juan Kiwi, Lucica Soare

CuO powders with a high specific surface area are shown to be able to produce H2O2 in aqueous solution under simulated light irradiation. The highest rate of peroxide production was observed under mild experimental conditions using O2 and a large surface a ...

2005

Dynamics of E. coli membrane cell peroxidation during TiO2 photocatalysis studies by ATR-FTIR spectroscopy and AFM microscopy

Juan Kiwi

Escherichia coli (E. coli) photokilling due to the TiO2 under light irradiation in a batch reactor was studied by using of attenuated total reflection Fourier transform infrared spectroscopy (ATR-FTIR) and atomic force microscopy (AFM). The ATR-FTIR spectr ...

2005

Supported Fe/C and Fe/Nafion/C catalysts for the photo-Fenton degradation of Orange II under solar irradiation

Juan Kiwi, César Pulgarin, Damien Gumy

The physicochemical properties and photocatalytic behavior of Fe/C and Fe/Nafion/C fabrics have been investigated under laboratory conditions (small vial, artificial light) and in large-scale photo-reactors under sunlight to achieve low-cost decontaminatio ...

2005

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Juan Kiwi

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Structure and performance of a novel TiO2-phosphonate composite photocatalyst

Escherichia coli inactivation by N, S co-doped commercial TiO2 powders under UV and visible light

Highly dispersed PTFE/Co3O4 flexible films as photocatalyst showing fast kinetic performance for the discoloration of azo-dyes under solar irradiation

Preparation, stabilization and characterization of TiO2 on thin polyethylene films (LDPE): Photocatalytic applications

Erratum to “Preparation, stabilization and characterization of TiO2 on thin polyethylene films (LDPE). Photocatalytic applications"

ZnSO4-TiO2 Doped Catalyst with Higher Activity in Photoctalytic

Elargissement du spectre d'absorption vers le visible de poudres commerciales de TiO2 par dopage par N, S, C. Préparation, caractérisation et activité photocatalytique antibactérienne

Stabilization mechanism of TiO2 on flexible fluorocarbon films as a functional photocatalyst

Catalytic activity of commercial of TiO2 powders for the abatement of the bacteria (E. coli) under solar simulated light: Influence of the isoelectric point

Performance and characterization of Ag-cotton and Ag/TiO2 loaded textiles during the abatement of E. coli

Laser kinetic spectroscopy of the interfacial charge transfer between membrane cell walls of E. coli and TiO2

Photocatalytic Storing of O2 as H2O2 Mediated by High Surface Area CuO. Evidence for a Reductive-Oxidative Interfacial Mechanism

Dynamics of E. coli membrane cell peroxidation during TiO2 photocatalysis studies by ATR-FTIR spectroscopy and AFM microscopy

Supported Fe/C and Fe/Nafion/C catalysts for the photo-Fenton degradation of Orange II under solar irradiation

The influence of Ti02 physico chemical characteristics in photocatalytic water disinfection

Antibacterial textiles prepared by deposition of silver

Dynamics and characterization of an innovative Raschig rings-Ti02 composite photocatalyst