Publications related to Photodegradation

Simultaneous local sensing of two chemical properties with dual soft probe scanning electrochemical microscopy

Hubert Girault, Andreas Stephan Lesch, Gregorio Bonazza

A new method for the rapid and economic fabrication of dual soft microelectrodes for Soft-Probe-Scanning electrochemical microscopy (Soft-Probe-SECM) and their use for the simultaneous local detection of locally generated species is presented. The process ...

PERGAMON-ELSEVIER SCIENCE LTD2023

EVA for Glass/Glass Solar PV Modules: Effect of encasulant storage conditions and process parameters

Christophe Ballif, Alessandro Francesco Aldo Virtuani, Luca Gnocchi

This work investigates t the effectiveness of glass-glass solar PV module structures used in combination with a EVA as an encapsulant material. The use of EVA in glass-glass structures is in principle discouraged, as a bioproduct of its photo-degradation i ...

IEEE2021

Encapsulant Selection for PID Resistant Modules Made with Heterojunction Solar Cells

Christophe Ballif, Alessandro Francesco Aldo Virtuani, Luca Gnocchi

Recent studies showed that SHJ solar cells can be prone to PID when encapsulated with a low volume resistivity encapsulant, such as ethylene vinyl acetate (EVA). These studies also demonstrated that their degradation mechanism is different from Al-BSF modu ...

EU PVSEC Proceedings2020

D35-TiO2 nano-crystalline film as a high performance visible-light photocatalyst towards the degradation of bis-phenol A

Ulf Anders Hagfeldt, Lin Yang, Xue Bai

Dye-sensitized photocatalytic suspension system for wastewater treatment is still limited in practice due to particle aggregation, fast charge carrier recombination, poor stability and recycling issue. In this study, we combine TiO2 nano-crystalline film w ...

ELSEVIER SCIENCE SA2019

Quantification of the local magnetized nanotube domains accelerating the photocatalytic removal of the emerging pollutant tetracycline

Henrik Moodysson Rønnow, Juan Kiwi, Ivica Zivkovic, Sami Rtimi, Jiajie Yu

( )Evidence is presented for the enhanced photodegradation of tetracycline (TC) by AgxO/FeOx/ZnO nanotubes (NTs) compared to AgxO/ZnO nanotubes under low-intensity solar light irradiation. A higher amount of the local magnetic domains with random orientati ...

ELSEVIER SCIENCE BV2019

Chlorinated ethene plume evolution after source thermal remediation: Determination of degradation rates and mechanisms

Christof Holliger, Julien Maillard, Alexandra Marie Murray, Jérémy Zimmermann

The extent, mechanism(s), and rate of chlorinated ethene degradation in a large tetrachloroethene (PCE) plume were investigated in an extensive sampling campaign. Multiple lines of evidence for this degradation were explored, including compound-specific is ...

ELSEVIER2019

In situ coupling of Ti2O with rutile TiO2 as a core-shell structure and its photocatalysis performance

Lijie Wang, Peng Zhang

The fabrication of high-performance, low-cost photocatalysis materials, which absorb in the visible-light region, is of significance for their practical applications. A Ti2O@TiO2 (rutile) core-shell structure was fabricated through dehydrogenation and oxid ...

Royal Soc Chemistry2017

VUV/UV light inducing accelerated phenol degradation with a low electric input

Juan Kiwi, Mengkai Li

This study presents the first evidence for the accelerated degradation of phenol by Fenton's reagent in a minifluidic VUV/UV photoreaction system (MVPS). A low-pressure mercury lamp used in the MVPS led to a complete degradation of phenol within 4-6 min. T ...

RSC Publishing2017

Ultrafast dynamics of the photo-excited hemes b and c(n) in the cytochrome b(6)f complex

Adrien Alexis Paul Chauvet, Rachna Agarwal

The dynamics of hemes b and c(n) within the cytochrome b(6)f complex are investigated by means of ultrafast broad-band transient absorption spectroscopy. On the one hand, the data reveal that, subsequent to visible light excitation, part of the b hemes und ...

Royal Society of Chemistry2017

Inkjet-printed microtiter plates for portable electrochemical immunoassays

Hubert Girault, Frédéric Gumy, Andreas Stephan Lesch, Fernando Cortes Salazar, Milica Jovic, Yingdi Zhu, Alexandra Bondarenko

Herein, we present the large-scale fabrication of multiplexed three-electrode sensors used in a point-of-care device platform that couples a magnetic bead-based immunoassay strategy with amperometric detection for rapid and highly sensitive analysis. The m ...

Elsevier Science Sa2017

Charge Carrier Dynamics in Organo Lead Halide Perovskites

Mahmoud Saeed Qaid Mohammad Hezam

In the last five years, organo lead halide perovskites have emerged as a new and efficient player in the field of photovoltaics, jumping in a short time to an advanced front position. This class of materials has also shown proficient light emission capabil ...

EPFL2017

Development of a processing route for carbon allotrope-based TiC porous nanocomposites

Paul Bowen

Ti-foils are currently used as a spallation target material to produce radioisotopes for physics research at the ISOLDE facility at CERN. However, radioisotope production rates often decrease over time due to material degradation from high operation temper ...

2017

Preparation, kinetics, mechanism and properties of semi-transparent photocatalytic stable films active in dye degradation

César Pulgarin, Juan Kiwi, Laura Victoria Suárez Murillo, Christophe Roussel

The photocatalytic activity, mechanism and characterization of polyethylene-TiO2 films (PE-TiO2) during the discoloration/degradation of methylene blue (MB) are reported in this study. PE-TiO2 films were prepared at moderate temperatures (similar to 90 deg ...

Elsevier2016

Live yeasts enhance fibre degradation in the cow rumen through an increase in plant substrate colonization by fibrolytic bacteria and fungi

AimsTo monitor the effect of a live yeast additive on feedstuff colonization by targeted fibrolytic micro-organisms and fibre degradation in the cow rumen. Methods and ResultsAbundance of adhering fibrolytic bacteria and fungi on feedstuffs incubated in sa ...

Wiley-Blackwell2016

Effects of dissolved organic matter on the phototransformation of aromatic amines in surface waters

Frank Jonathan Leresche

Dissolved Organic Matter (DOM) is a complex mixture of thousands of organic molecules ubiquitously present in surface waters. Its influence on the photodegradation of organic contaminants is a complicated topic. For decades DOM had been mostly assumed to h ...

EPFL2016

Photosensitizing and Inhibitory Effects of Ozonated Dissolved Organic Matter on Triplet-Induced Contaminant Transformation

Urs von Gunten, Silvio Canonica

Dissolved organic matter (DOM) is both a promoter and an inhibitor of triplet-induced organic contaminant oxidation. This dual role was systematically investigated through photochemical experiments with three types of DOM of terrestrial and aquatic origins ...

American Chemical Society2015

Proton polarization above 70% by DNP using photo-excited triplet states, a first step towards a broadband neutron spin filter

Tim Rolf Eichhorn

The use of polarized protons as neutron spin filter is an attractive alternative to the well established neutron polarization techniques, as the large, spin-clepenclent neutron scattering cross-section for protons is useful up to the sub-MeV region. Employ ...

Elsevier2014

Optical properties of anodically degraded ZnO

Christophe Ballif, Sylvain Nicolay

We discuss the optical properties of non-degraded and anodically degraded boron-doped zinc oxide (ZnO:B) deposited by low-pressure chemical vapour deposition on soda-lime glass. The optical model used to simulate the infrared reflectance in the wavelength ...

American Institute of Physics2014

Spatio-Temporal Presence of Micropollutants and their Metabolites in Lake Geneva and Susceptibility to Direct and Indirect Photodegradation Processes

Florence Bonvin

Invisible to the human eye, yet ubiquitous... The occurrence and the potential adverse effects of micropollutants in the environment are uncontested. Due to incomplete removal by conventional wastewater treatment technologies, the aquatic environment is co ...

EPFL2013

Enhancement of micropollutant degradation at the outlet of small wastewater treatment plants

David Andrew Barry, Luca Rossi, Alessandro Brovelli, Jonas Margot, Pierre Claude Jean Queloz

The aim of this work was to evaluate low-cost and easy-to-operate engineering solutions that can be added as a polishing step to small wastewater treatment plants to reduce the micropollutant load to water bodies. The proposed design combines a sand filter ...

Public Library of Science2013