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Urs von Gunten

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Publications associées (155)

Novel Chemiluminescence-based Method for the Quantification of the Total N-nitrosamines Concentration in Water

Florian Frédéric Vincent Breider, Urs von Gunten

2017

A computer-based prediction platform for the reaction of ozone with organic compounds in aqueous solution: kinetics and mechanisms

Urs von Gunten, Minju Lee, Kathrin Fenner

Ozonation of secondary wastewater effluents can reduce the discharge of micropollutants by transforming their chemical structures. Therefore, a better understanding of the formation of transformation products during ozonation is important. In this study, a ...

Royal Soc Chemistry2017

Quantification of Total N-Nitrosamine Concentrations in Aqueous Samples via UV-Photolysis and Chemiluminescence Detection of Nitric Oxide

Florian Frédéric Vincent Breider, Urs von Gunten

N-Nitrosamines are potent mutagens and carcinogens that can be formed during oxidative water treatment. This study describes a novel method for the determination of total N-nitrosamines by UV-photolysis and subsequent chemiluminescence detection of nitric ...

American Chemical Society2017

Fingerprinting the reactive toxicity pathways of 50 drinking water disinfection by-products

Urs von Gunten

A set of nine in vitro cellular bioassays indicative of different stages of the cellular toxicity pathway was applied to 50 disinfection by-products (DBPs) to obtain a better understanding of the commonalities and differences in the molecular mechanisms of ...

Elsevier2016

How do you like your tap water?

Urs von Gunten

American Association for the Advancement of Science2016

Aqueous Equilibrium Constants Of Formation For Bromamines, Chloramines, And Bromochloramines: Quantum Chemistry Estimates

Jeremy Samuel Arey, Urs von Gunten, Daniela Trogolo

Royal Soc Chemistry2016

Computational Chemistry Investigation Of The Bromide-Catalyzed Formation Of Ndma From N,N-Dimethylsulfamide During Ozonation

Jeremy Samuel Arey, Brijesh Kumar Mishra, Urs von Gunten, Michèle Bernadette Heeb, Daniela Trogolo

Royal Soc Chemistry2016

Oxidation of cetirizine, fexofenadine and hydrochlorothiazide during ozonation: Kinetics and formation of transformation products

Urs von Gunten, Juliane Hollender

The efficiency of wastewater ozonation for the abatement of three nitrogen-containing pharmaceuticals, two antihistamine drugs, cetirizine (CTR) and fexofenadine (FXF), and the diuretic drug, hydrochlorothiazide (HCTZ), was investigated. Species-specific s ...

Elsevier2016

Advances in predicting organic contaminant abatement during ozonation of municipal wastewater effluent: reaction kinetics, transformation products, and changes of biological effects

Urs von Gunten, Yun Ho Lee

Ozonation of municipal wastewater effluent has been considered in recent years as an enhanced wastewater treatment technology to abate trace organic contaminants (micropollutants). The efficiency of ozonation for micropollutant abatement depends on (1) the ...

Royal Soc Chemistry2016

Halide removal from aqueous solution by novel silver-polymeric materials

Urs von Gunten

The objective of this study was to analyze the behavior of a new material, silver-doped polymeric cloth (Ag-cloth), in the removal of bromide and iodide from waters. Silver is immobilized on the cloth, guaranteeing selective adsorption of the halide ions a ...

Elsevier2016

Formation of disinfection by-products during ballast water treatment with ozone, chlorine, and peracetic acid: influence of water quality parameters

Urs von Gunten

As ocean-going ships begin implementing chemical disinfection to treat ballast water, the potential formation of disinfection by-products (DBPs) is an important issue of concern. This is especially critical since ballast waters are often saline, and the in ...

Royal Soc Chemistry2015

Development of prediction models for the reactivity of organic compounds with ozone in aqueous solution by quantum chemical calculations: Role of delocalized and localized molecular orbitals

Jeremy Samuel Arey, Urs von Gunten, Saskia Gisela Zimmermann-Steffens, Minju Lee, Kathrin Fenner

Second-order rate constants (k(O3)) for the reaction of ozone with micropollutants are essential parameters for the assessment of micropollutant elimination efficiency during ozonation in water and wastewater treatment. Prediction models for k(O3) were dev ...

Amer Chemical Soc2015

Molecular mechanism of NDMA formation from N,N-dimethylsulfamide during ozonation: Quantum chemical insights into a bromide-catalyzed pathway

Jeremy Samuel Arey, Brijesh Kumar Mishra, Urs von Gunten, Michèle Bernadette Heeb, Daniela Trogolo

During ozonation of drinking water, the fungicide metabolite NN-dimethyIsulfamide (DMS) can be transformed into a highly toxic product, N-nitrosodimethylamine (NDMA). We used quantum chemical computations and stopped-flow experiments to evaluate a chemical ...

Amer Chemical Soc2015

Effect of Ozone Treatment on Nano-Sized Silver Sulfide in Wastewater Effluent

Renata Behra, Urs von Gunten

Silver nanoparticles used in consumer products are likely to be released into municipal wastewater. Transformation reactions, most importantly sulfidation, lead to the formation of nanoscale silver sulfide (nano-Ag2S) particles. In wastewater treatment pla ...

American Chemical Society2015

Determinants of disinfectant pretreatment efficacy for nitrosamine control in chloraminated drinking water

Urs von Gunten

Utilities using chloramines need strategies to mitigate nitrosamine formation to meet potential future nitrosamine regulations. The ability to reduce NDMA formation under typical post-chloramination conditions of pretreatment with ultraviolet light from a ...

Elsevier2015

Sulfamethoxazole and isoproturon degradation and detoxification by a laccase-mediator system: Influence of treatment conditions and mechanistic aspects

Christof Holliger, Pierre-Jean Copin, Jonas Margot, David Andrew Barry, Urs von Gunten

The potential of laccase-mediator systems (LMS) for the removal and detoxification of two wastewater micropollutants, the antibiotic sulfamethoxazole (SMX) and the herbicide isoproturon (IPN), was assessed. The influence of various parameters on micropollu ...

Elsevier2015

Catalytic processes and new materials and technologies in water/wastewater treatment

Urs von Gunten

Elsevier2015

Mechanistic Study on the Formation of Cl-/Br-/I-Trihalomethanes during Chlorination/Chloramination Combined with a Theoretical Cytotoxicity Evaluation

Urs von Gunten

Chlorination followed by chloramination can be used to mitigate the formation of potentially toxic iodinated disinfection byproducts (I-DBPs) while controlling the formation of regulated chloro-bromo-DBPs (Cl-/Br-DBPs). Water samples containing dissolved o ...

American Chemical Society2015

Degradation rates of benzotriazoles and benzothiazoles under UV-C irradiation and the advanced oxidation process UV/H2O2

Silvio Canonica, Urs von Gunten

Benzotriazoles (BTs) and benzothiazoles (BTHs) are extensively used chemicals found in a wide range of household and industrial products. They are chemically stable and are therefore ubiquitous in the aquatic environment. The present study focuses on the p ...

Elsevier2015

Reaction of bromine and chlorine with phenolic compounds and natural organic matter extracts - Electrophilic aromatic substitution and oxidation

Urs von Gunten, Eva Maria Rodriguez Franco

Phenolic compounds are known structural moieties of natural organic matter (NOM), and their reactivity is a key parameter for understanding the reactivity of NOM and the disinfection by-product formation during oxidative water treatment. In this study, spe ...

Elsevier2015

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