References of "Douven, Sigrid"
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See detailSol-gel Ni-based/γ-Al2O3 as efficient catalysts for toluene reforming: Catalytic activity during long-term experiments and in presence of H2S
Claude, Vincent ULiege; Mahy, Julien ULiege; Douven, Sigrid ULiege et al

in Journal of Environmental Chemical Engineering (2020), 8

Last decades, the valorization of biomass became a topic of interest, and especially the production of syngas by the catalytic reforming of biomass. But one drawback for a large-scale development is the ... [more ▼]

Last decades, the valorization of biomass became a topic of interest, and especially the production of syngas by the catalytic reforming of biomass. But one drawback for a large-scale development is the associated production of tars. This work focuses on the catalytic reforming of tars present in bio-syngas reactors. Efficient Ni-based/γ-Al2O3 catalysts were developed in previous studies by an aqueous sol-gel process. Here, four of those catalysts, exhibiting promising catalytic properties for toluene reforming (used as tar model molecule), were further evaluated on long-term experiments and under H2S. Indeed, long-term performance and resistance to poisoning are two key properties of catalysts for industrial applications. One commercial catalyst, HifuelTM, was also evaluated for comparison. The results showed that the pure Ni/γ-Al2O3 catalyst presented a low deactivation throughout 30 h of experiment with neither Ni particle size nor support crystallinity alteration. All co-doped Ni/γ-Al2O3 catalysts were more resistant against deactivation than the pure Ni/γ-Al2O3 catalyst. As only amorphous carbon was deposited, an easy regeneration was performed by heating the catalysts 2 h at 650 °C under air. The catalytic activity remained unchanged in similar 30 h-experiment. Contrarily, the commercial HifuelTM catalyst underwent a strong and quick deactivation by the formation of filamentous carbon. The regeneration under air was not sufficient to regenerate the catalyst. The Ni/γ-Al2O3 catalyst activity was assessed in the presence of H2S. The results showed that the toluene conversion was only slightly affected by the presence of H2S in the syngas mixture, highlighting its very good resistance to poisoning. [less ▲]

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See detailEffcient N, Fe Co-Doped TiO2 Active under Cost-Effective Visible LED Light: From Powders to Films
Douven, Sigrid ULiege; Mahy, Julien ULiege; Wolfs, Cédric ULiege et al

in Catalysts (2020), 10

An eco-friendly photocatalytic coating, active under a cost-effective near-visible LED system, was synthesized without any calcination step for the removal of organic pollutants. Three types of doping (Fe ... [more ▼]

An eco-friendly photocatalytic coating, active under a cost-effective near-visible LED system, was synthesized without any calcination step for the removal of organic pollutants. Three types of doping (Fe, N and Fe + N), with different dopant/Ti molar ratios, were investigated and compared with undoped TiO2 and the commercial P25 photocatalyst. Nano-crystalline anatase-brookite particles were successfully produced with the aqueous sol-gel process, also at a larger scale. All samples displayed a higher visible absorption and specific surface area than P25. Photoactivity of the catalyst powders was evaluated through the degradation of p-nitrophenol in water under visible light (>400 nm). As intended, all samples were more performant than P25. The N-doping, the Fe-doping and their combination promoted the activity under visible light. Films, coated on three different substrates, were then compared. Finally, the photoactivity of a film, produced from the optimal N-Fe co-doped colloid, was evaluated on the degradation of (i) p-nitrophenol under UV-A light (365 nm) and (ii) rhodamine B under LED visible light (395 nm), and compared to undoped TiO2 film. The higher enhancement is obtained under the longer wavelength (395 nm). The possibility of producing photocatalytic films without any calcination step and active under low-energy LED light constitutes a step forward for an industrial development. [less ▲]

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See detailNi- and Fe-doped γ-Al2O3 or Olivine as primary catalyst for toluene reforming
Claude, Vincent; Mahy, Julien ULiege; Douven, Sigrid ULiege et al

in Materials Today Chemistry (2019), 14

In this paper, γ-Al2O3 supports prepared by a new aqueous sol-gel synthesis were doped with 2 wt. % of Ni or 10 wt. % of Fe and used as primary catalysts for the bio-syngas purification. Raw olivine, Ni ... [more ▼]

In this paper, γ-Al2O3 supports prepared by a new aqueous sol-gel synthesis were doped with 2 wt. % of Ni or 10 wt. % of Fe and used as primary catalysts for the bio-syngas purification. Raw olivine, Ni- and Fe-doped olivine catalysts were also prepared for comparison with alumina-based samples. The physico-chemical properties of the samples were characterized by X-ray diffraction, nitrogen adsorption-desorption and temperature programmed reduction. Results showed that alumina-based samples were more porous than olivine-based ones. Stronger interactions of the dopants with the support were highlighted in the case of alumina samples. The catalysts were then tested at two temperatures, 750 and 850 °C, for the toluene reforming. Toluene was chosen as biomass gasification tar model molecule. At 750 °C, the Ni/olivine sample showed a higher toluene conversion and a lower benzene selectivity than the Ni/alumina sample. This lower catalytic activity was attributed to strong interactions between nickel and alumina (formation of a spinel NiAl2O4). At 850 °C, similar performances were obtained both for olivine and for alumina supports. However, due to lower interactions with the support and a better reduction of Ni, the methane conversion of the Ni/olivine sample was higher than that of the Ni/alumina sample. [less ▲]

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See detailTiO2 nanocrystallites photocatalysts modified with metallic species: Comparison between Cu and Pt doping
Mahy, Julien ULiege; Tilkin, Rémi ULiege; Douven, Sigrid ULiege et al

in Surfaces and Interfaces (2019), 17

In this work, TiO2 nanoparticles were modified with different Cu and Pt species: metallic nanoparticles and ions. The photocatalysts were prepared via a sol-gel process by peptization with HNO3 at low ... [more ▼]

In this work, TiO2 nanoparticles were modified with different Cu and Pt species: metallic nanoparticles and ions. The photocatalysts were prepared via a sol-gel process by peptization with HNO3 at low temperature (i.e. < 100°C). The metallic nanoparticles were prepared by NaBH4 reduction from the corresponding metallic salts. For the ion modification, metallic salts were just added during the synthesis of the TiO2. The materials were characterized by X-ray diffraction (XRD), nitrogen adsorption-desorption, diffuse reflectance, and X-ray photoelectron spectroscopy (XPS). The results showed that the TiO2 materials were mainly composed of anatase phase with a small amount of brookite phase. The nanoparticle size was in the range of 4-8 nm leading to high specific surface area (i.e. > 200 m2 g-1). The absorption property of these materials showed a visible sensitization for all samples even the pure TiO2 compared to the Evonik P25 due to N-doping confirmed by XPS analysis. The photocatalytic activity on the degradation of p-nitrophenol (PNP) showed an increase in the efficiency for nearly all catalysts compared to the pure one. Some mechanisms were proposed to explain these modifications of activity with doping. Under visible light, the photocatalysts were up to 5 times more efficient than P25 (for the best sample composed of Cu metallic nanoparticles). [less ▲]

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See detailProjet BLUE-V dans le Pôle GREENWIN (01/12/2017-30/11/2020) (n° 7744, Plan MARSHALL)
Lambert, Stéphanie ULiege; Douven, Sigrid ULiege; Luizi, Frédéric et al

Report (2019)

La désinfection de l’eau passe très souvent par le recours à des produits biocides tels que le chlore, le brome, etc., lesquels ont un effet rémanent dont la liste des toxicités induites pour les ... [more ▼]

La désinfection de l’eau passe très souvent par le recours à des produits biocides tels que le chlore, le brome, etc., lesquels ont un effet rémanent dont la liste des toxicités induites pour les utilisateurs ne cesse de s’étoffer (irritation des voies respiratoires, pénétration à travers le scrotum et altération de la spermatogénèse, irritation de la peau, etc.). L’utilisation de techniques non-rémanentes comme le traitement aux rayonnements ultraviolets apporte une alternative intéressante mais qui, à ce jour, est souvent limitée à un post-traitement ou à l’intégration dans des processus très spécifiques. L’objectif de BlueV est de développer une nouvelle génération de stérilisateurs basse énergie par oxydation avancée susceptible de remplacer avantageusement, dans de nombreuses utilisations, les stérilisateurs UV. Dans ces équipements, une plaque émettrice d’une longueur d’onde optimisée, stimulera une plaque proche revêtue d’une peinture photocatalytique pour développer une oxydation avancée maximale visant à désinfecter et décontaminer l’eau. La performance globale de ces nouveaux stérilisateurs sera validée pour le traitement d’eaux récréatives (piscines, fontaines) et plus particulièrement pour la désinfection de l’eau et pour la dégradation de polluants organiques comme l’ammoniaque et des micropolluants. En complément, la performance sera également validée pour l’utilisation de ces nouveaux outils comme complément à un traitement chloré de l’eau afin de déterminer et quantifier la fonction éventuelle de déchloramination. Cette nouvelle technologie sera directement intégrée au sein même d’éléments d’un circuit hydraulique standard comme des fontaines ou des lames d’eau. Dès lors, elle offrira aux utilisateurs finaux la possibilité de désinfecter et décontaminer leurs eaux récréatives sans avoir recours à des équipements complexes et onéreux devant être installés dans un local technique et nécessitant une manipulation délicate. La technologie BlueV est rupture totale avec la technologie actuelle et conduira à la fabrication et la commercialisation par un consortium de PME wallonnes de dispositifs peu encombrants, sans dangerosité, nécessitant très peu de maintenance, aux performances inédites et très peu énergivores. La possibilité que de tels dispositifs puissent fonctionner de façon autonome grâce uniquement à l’énergie solaire sera testée. [less ▲]

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See detailTowards sustainable methanol from industrial CO2 sources
Douven, Sigrid ULiege; Benkoussas, Hana ULiege; Font-Palma, Carolina et al

in North, Michael; Styring, Peter (Eds.) Carbon dioxide utilisation (2019)

Mitigation of carbon dioxide emissions from industrial facilities has received less attention than the energy sector in the path towards decarbonisation up to now. Therefore, this chapter presents ... [more ▼]

Mitigation of carbon dioxide emissions from industrial facilities has received less attention than the energy sector in the path towards decarbonisation up to now. Therefore, this chapter presents potential measures to reduce CO2 emissions through the conversion of CO2 from industrial sources into methanol in order to achieve the targets set by the European Commission. Methanol is easy to synthesise from CO2 and hydrogen and a stable liquid fuel at ambient conditions, which makes it an ideal candidate for long-term storage of electricity from variable renewable sources. If methanol is stored, it could be used to generate electricity when necessary or as transport fuel due to its high octane rating. While Europe’s contribution in the worldwide production is rather modest, Northeast Asia is the largest methanol consumer. In this work, an integrated system is proposed to re-use CO2 emitted from an ammonia plant is converted into methanol. An Aspen Plus model was developed for the three sub-processes; i) CO2 capture of an ammonia plant, that already captures CO2 as part of the hydrogen production stage, ii) water/CO2 co-electrolysis, and iii) methanol synthesis and purification. Heat integration strategies are carried out to improve the process efficiency of the integrated system. This work also discusses current and potential use of CO2 emitted from other industrial sources such as steel mills, ethanol plants and power industry. The future of CO2 conversion into methanol greatly depends on its economics compared to traditional methanol production from fossil fuels. A review of the costs for the CO2-to-methanol process is presented, where it is recognised that projects require a carbon tax to make them financially attractive. The installation of CO2-to-methanol plants could fully replace current importations in Europe, for which only about 11 plants producing each 440 t/year would be needed. A key for the growth of CO2-to-methanol facilities is that the energy required is supplied by renewable energy to truly contribute to the industry decarbonisation. As such, even higher potential is anticipated if methanol is used as a sustainable energy carrier to fulfil the so-called methanol economy. [less ▲]

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See detailAmbient temperature ZrO2-doped TiO2 crystalline photocatalysts: Highly efficient powders and films for water depollution
Mahy, Julien ULiege; Lambert, Stéphanie ULiege; Tilkin, Rémi ULiege et al

in Materials Today Energy (2019), 13

In this paper, several TiO2 materials doped with zirconia precursor (0.7, 1.4, 1.6 and 2.0 mol%) were synthesized by an easy aqueous sol-gel synthesis at ambient temperature. This method consisted in the ... [more ▼]

In this paper, several TiO2 materials doped with zirconia precursor (0.7, 1.4, 1.6 and 2.0 mol%) were synthesized by an easy aqueous sol-gel synthesis at ambient temperature. This method consisted in the peptization of the TiO2 colloid in presence of HNO3. The corresponding pure TiO2 material was also synthesized for comparison. The performances and the physico-chemical properties of these materials were compared to the well-known Evonik P25 photocatalyst. The physico-chemical characterizations showed that nano-crystalline anatase-brookite particles were produced with the sol-gel process, with higher specific surface area than P25 (∼200 m2 g-1 vs. 47 m2 g-1). All samples presented a higher visible absorption than P25. The XPS spectra showed that all the samples were doped with nitrogen and that mixed TiO2–ZrO2 oxide materials were obtained when doping with zirconia precursor. Photoactivity was evaluated through the degradation of p-nitrophenol in water. On the one hand, under UV/visible light, the ZrO2 doping increased the degradation efficiency of the pure TiO2 catalyst due to a better charge separation in the mixed TiO2–ZrO2 oxides. The activity of the sample with the highest dopant content was even higher than the one of P25. On the other hand, under visible light, all samples were much more efficient than P25. This activity shift towards visible range was due to the N-doping of the catalysts, with a slight improvement for the doped ones. Finally, the feasibility of producing films starting from an aqueous suspension of the photocatalyst was assessed on P25, pure TiO2 and the best doped material. The photoactivity of these films, evaluated on the degradation of methylene blue under UV-A light, showed that the sample with the highest dopant concentration had an efficiency 4 times higher than pure TiO2 and 20 times higher than P25. [less ▲]

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See detailN, Fe single-doped and N-Fe co-doped TiO2 increasing photoactivity under visible light
Douven, Sigrid ULiege; Mahy, Julien ULiege; Lambert, Stéphanie ULiege

Conference (2019, June 20)

Nowadays, environmental pollution is a major concern in our society and numerous researches are realized to treat water, air and soil pollution. Among the different methods developed to reduce pollution ... [more ▼]

Nowadays, environmental pollution is a major concern in our society and numerous researches are realized to treat water, air and soil pollution. Among the different methods developed to reduce pollution, photocatalysis is a way to degrade organic pollutants. The most widely used photocatalyst is TiO2. For several years, the sol-gel synthesis has proven effective for the synthesis of TiO2 in the form of powders or films. Aqueous and non-aqueous methods can be used to produce TiO2 by sol-gel process. Regarding the cost and the environmental impact, the aqueous way seems to be the best way to produce large amount of TiO2 materials. The aim of the present work is to develop new formulation of doped and co-doped TiO2 to extend the activity towards visible region with optimal production costs and to improve the dopant content in order to maximize the photocatalytic activity. This study presents results with catalysts powders, but the final aim is to produce doped TiO2 films as previously successfully developed. [less ▲]

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See detailProjet BLUE-V dans le Pôle GREENWIN (01/12/2017-30/11/2020) (n° 7744, Plan MARSHALL)
Lambert, Stéphanie ULiege; Douven, Sigrid ULiege; Luizi, Frédéric et al

Report (2019)

La désinfection de l’eau passe très souvent par le recours à des produits biocides tels que le chlore, le brome, etc., lesquels ont un effet rémanent dont la liste des toxicités induites pour les ... [more ▼]

La désinfection de l’eau passe très souvent par le recours à des produits biocides tels que le chlore, le brome, etc., lesquels ont un effet rémanent dont la liste des toxicités induites pour les utilisateurs ne cesse de s’étoffer (irritation des voies respiratoires, pénétration à travers le scrotum et altération de la spermatogénèse, irritation de la peau, etc.). L’utilisation de techniques non-rémanentes comme le traitement aux rayonnements ultraviolets apporte une alternative intéressante mais qui, à ce jour, est souvent limitée à un post-traitement ou à l’intégration dans des processus très spécifiques. L’objectif de BlueV est de développer une nouvelle génération de stérilisateurs basse énergie par oxydation avancée susceptible de remplacer avantageusement, dans de nombreuses utilisations, les stérilisateurs UV. Dans ces équipements, une plaque émettrice d’une longueur d’onde optimisée, stimulera une plaque proche revêtue d’une peinture photocatalytique pour développer une oxydation avancée maximale visant à désinfecter et décontaminer l’eau. La performance globale de ces nouveaux stérilisateurs sera validée pour le traitement d’eaux récréatives (piscines, fontaines) et plus particulièrement pour la désinfection de l’eau et pour la dégradation de polluants organiques comme l’ammoniaque et des micropolluants. En complément, la performance sera également validée pour l’utilisation de ces nouveaux outils comme complément à un traitement chloré de l’eau afin de déterminer et quantifier la fonction éventuelle de déchloramination. Cette nouvelle technologie sera directement intégrée au sein même d’éléments d’un circuit hydraulique standard comme des fontaines ou des lames d’eau. Dès lors, elle offrira aux utilisateurs finaux la possibilité de désinfecter et décontaminer leurs eaux récréatives sans avoir recours à des équipements complexes et onéreux devant être installés dans un local technique et nécessitant une manipulation délicate. La technologie BlueV est rupture totale avec la technologie actuelle et conduira à la fabrication et la commercialisation par un consortium de PME wallonnes de dispositifs peu encombrants, sans dangerosité, nécessitant très peu de maintenance, aux performances inédites et très peu énergivores. La possibilité que de tels dispositifs puissent fonctionner de façon autonome grâce uniquement à l’énergie solaire sera testée. [less ▲]

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See detailImplications of Apparent Pseudo-Second-Order Adsorption Kinetics onto Cellulosic Materials: A Review
Hubbe, Martin A.; Azizian, Saeid; Douven, Sigrid ULiege

in BioResources (2019), 14 (3)

The pseudo-second-order (PSO) kinetic model has become among the most popular ways to fit rate data for adsorption of metal ions, dyes, and other compounds from aqueous solution onto cellulose-based ... [more ▼]

The pseudo-second-order (PSO) kinetic model has become among the most popular ways to fit rate data for adsorption of metal ions, dyes, and other compounds from aqueous solution onto cellulose-based materials. This review first considers published evidence regarding the validity of the mechanistic assumptions underlying application of the PSO model to adsorption kinetics. A literal interpretation of the model requires an assumption that different adsorption sites on a solid substrate randomly collide with each other during a rate-limiting mechanistic step. Because of problems revealed by the literature regarding the usual assumptions associated with the PSO model, this review also considers how else to account for good fits of adsorption data to the PSO model. Studies have shown that adsorption behavior that fits the PSO model well often can be explained by diffusion-based mechanisms. Hypothetical data generated using the assumption of pseudo-first-order rate behavior has been shown to fit the PSO model very well. In light of published evidence, adsorption kinetics of cellulosic materials is expected to mainly depend on diffusion-limited processes, as affected by heterogeneous distributions of pore sizes and continual partitioning of solute species between a dissolved state and a fixed state of adsorption. [less ▲]

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See detailModification inorganique d’une argile locale: Application au traitement des eaux
Benhebal, Hadj; Kadi, Samir; Lellou, Salima et al

Poster (2018, December)

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See detailElaboration de matériaux zéolithiques à partir d'argiles locales: Application au traitement des eaux
Benhebal, Hadj; Kadi, Samir; Lellou, Salima et al

Poster (2018, December)

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See detailProjet BLUE-V dans le Pôle GREENWIN (01/12/2017-30/11/2020) (n° 7744, Plan MARSHALL)
Lambert, Stéphanie ULiege; Douven, Sigrid ULiege; Luizi, Frédéric et al

Report (2018)

La désinfection de l’eau passe très souvent par le recours à des produits biocides tels que le chlore, le brome, etc., lesquels ont un effet rémanent dont la liste des toxicités induites pour les ... [more ▼]

La désinfection de l’eau passe très souvent par le recours à des produits biocides tels que le chlore, le brome, etc., lesquels ont un effet rémanent dont la liste des toxicités induites pour les utilisateurs ne cesse de s’étoffer (irritation des voies respiratoires, pénétration à travers le scrotum et altération de la spermatogénèse, irritation de la peau, etc.). L’utilisation de techniques non-rémanentes comme le traitement aux rayonnements ultraviolets apporte une alternative intéressante mais qui, à ce jour, est souvent limitée à un post-traitement ou à l’intégration dans des processus très spécifiques. L’objectif de BlueV est de développer une nouvelle génération de stérilisateurs basse énergie par oxydation avancée susceptible de remplacer avantageusement, dans de nombreuses utilisations, les stérilisateurs UV. Dans ces équipements, une plaque émettrice d’une longueur d’onde optimisée, stimulera une plaque proche revêtue d’une peinture photocatalytique pour développer une oxydation avancée maximale visant à désinfecter et décontaminer l’eau. La performance globale de ces nouveaux stérilisateurs sera validée pour le traitement d’eaux récréatives (piscines, fontaines) et plus particulièrement pour la désinfection de l’eau et pour la dégradation de polluants organiques comme l’ammoniaque et des micropolluants. En complément, la performance sera également validée pour l’utilisation de ces nouveaux outils comme complément à un traitement chloré de l’eau afin de déterminer et quantifier la fonction éventuelle de déchloramination. Cette nouvelle technologie sera directement intégrée au sein même d’éléments d’un circuit hydraulique standard comme des fontaines ou des lames d’eau. Dès lors, elle offrira aux utilisateurs finaux la possibilité de désinfecter et décontaminer leurs eaux récréatives sans avoir recours à des équipements complexes et onéreux devant être installés dans un local technique et nécessitant une manipulation délicate. La technologie BlueV est rupture totale avec la technologie actuelle et conduira à la fabrication et la commercialisation par un consortium de PME wallonnes de dispositifs peu encombrants, sans dangerosité, nécessitant très peu de maintenance, aux performances inédites et très peu énergivores. La possibilité que de tels dispositifs puissent fonctionner de façon autonome grâce uniquement à l’énergie solaire sera testée. [less ▲]

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See detailProjet BLUE-V dans le Pôle GREENWIN (01/12/2017-30/11/2020) (n° 7744, Plan MARSHALL)
Lambert, Stéphanie ULiege; Douven, Sigrid ULiege; Luizi, Frédéric et al

Report (2018)

La désinfection de l’eau passe très souvent par le recours à des produits biocides tels que le chlore, le brome, etc., lesquels ont un effet rémanent dont la liste des toxicités induites pour les ... [more ▼]

La désinfection de l’eau passe très souvent par le recours à des produits biocides tels que le chlore, le brome, etc., lesquels ont un effet rémanent dont la liste des toxicités induites pour les utilisateurs ne cesse de s’étoffer (irritation des voies respiratoires, pénétration à travers le scrotum et altération de la spermatogénèse, irritation de la peau, etc.). L’utilisation de techniques non-rémanentes comme le traitement aux rayonnements ultraviolets apporte une alternative intéressante mais qui, à ce jour, est souvent limitée à un post-traitement ou à l’intégration dans des processus très spécifiques. L’objectif de BlueV est de développer une nouvelle génération de stérilisateurs basse énergie par oxydation avancée susceptible de remplacer avantageusement, dans de nombreuses utilisations, les stérilisateurs UV. Dans ces équipements, une plaque émettrice d’une longueur d’onde optimisée, stimulera une plaque proche revêtue d’une peinture photocatalytique pour développer une oxydation avancée maximale visant à désinfecter et décontaminer l’eau. La performance globale de ces nouveaux stérilisateurs sera validée pour le traitement d’eaux récréatives (piscines, fontaines) et plus particulièrement pour la désinfection de l’eau et pour la dégradation de polluants organiques comme l’ammoniaque et des micropolluants. En complément, la performance sera également validée pour l’utilisation de ces nouveaux outils comme complément à un traitement chloré de l’eau afin de déterminer et quantifier la fonction éventuelle de déchloramination. Cette nouvelle technologie sera directement intégrée au sein même d’éléments d’un circuit hydraulique standard comme des fontaines ou des lames d’eau. Dès lors, elle offrira aux utilisateurs finaux la possibilité de désinfecter et décontaminer leurs eaux récréatives sans avoir recours à des équipements complexes et onéreux devant être installés dans un local technique et nécessitant une manipulation délicate. La technologie BlueV est rupture totale avec la technologie actuelle et conduira à la fabrication et la commercialisation par un consortium de PME wallonnes de dispositifs peu encombrants, sans dangerosité, nécessitant très peu de maintenance, aux performances inédites et très peu énergivores. La possibilité que de tels dispositifs puissent fonctionner de façon autonome grâce uniquement à l’énergie solaire sera testée. [less ▲]

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See detailUtilisation of CO2 from an Industrial source for Methanol production
Font-Palma, Carolina; Douven, Sigrid ULiege; Léonard, Grégoire ULiege

Conference (2016, September)

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See detailThe range of validity of sorption kinetic models
Douven, Sigrid ULiege; Pàez Martinez, Carlos ULiege; Gommes, Cédric ULiege

in Journal of Colloid and Interface Science (2015), 448

Several hundred papers are published yearly reporting liquid-phase adsorption kinetics data. In general the data is analyzed using a variety of standard models such as the pseudo first- and second-order ... [more ▼]

Several hundred papers are published yearly reporting liquid-phase adsorption kinetics data. In general the data is analyzed using a variety of standard models such as the pseudo first- and second-order models and the Intraparticle-Diffusion model. The validity of these models is often assessed empirically via their ability to fit the data, independently of their physicochemical soundness. The aim of the present paper is to rationalize the analysis of liquid-phase adsorption kinetics data, and to investigate experimental factors that influence the adsorption kinetics, in addition to the characteristics of the adsorbent material itself. For that purpose we use a simple Langmuir adsorption–diffusion model, which enables us to identify three dimensionless numbers that characterize the working regime of any batch adsorption experiment: an adsorption Thiele modulus, a saturation modulus, and a loading modulus. The standard models are found to be particular cases of the general adsorption–diffusion model for specific values of the dimensionless numbers. This provides sound physicochemical criteria for the validity of the models. Based on our modeling, we also propose a general yet simple data analysis procedure to practically estimate the diffusion coefficient in adsorbent pellets starting from adsorption halftimes. [less ▲]

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