Christine Brauer - Academia.edu (original) (raw)
Papers by Christine Brauer
Journal of Water Process Engineering
UVA and UVC radiation were compared for the activation of H 2 O 2 or S 2 O 8 2to remove micropoll... more UVA and UVC radiation were compared for the activation of H 2 O 2 or S 2 O 8 2to remove micropollutants remaining in treated wastewater with a view to optimising the cost and/or the efficiency of the commonly studied UVC/H 2 O 2 process. Experiments were carried out in a dynamic laboratory pilot (20 L). In a simple matrix, UVA radiation were able to produce oxydative radicals from H 2 O 2 or S 2 O 8 2-, although faster degradation of the estrogens was observed under UVC radiation (up to 55-fold). With both UV radiation, S 2 O 8 2was photolyzed faster than H 2 O 2 , resulting in faster estrogen degradation (up to 12-fold). Coupling UVA to H 2 O 2 was considered not to be viable because less than 4% of the compounds were degraded at 1000 mJ cm-2. In a treated wastewater, estrogen degradations were inhibited due to organic matter and stronger inhibitions were observed with S 2 O 8 2processes (up to 80% inhibition compared to simple matrix). The UVC/S 2 O 8 2-process still achieved the fastest degradation rate, but is roughly comparable to the UVC/H 2 O 2-process. Very low degradation rates obtained with UVA/S 2 O 8 2limit the interest in the process. Experiments were also carried out on a mixture of pharmaceuticals leading to similar conclusions.
An entry from the Cambridge Structural Database, the world's repository for small molecule cr... more An entry from the Cambridge Structural Database, the world's repository for small molecule crystal structures. The entry contains experimental data from a crystal diffraction study. The deposited dataset for this entry is freely available from the CCDC and typically includes 3D coordinates, cell parameters, space group, experimental conditions and quality measures.
Water Science and Technology, Sep 7, 2023
Separation and Purification Technology
Herein, the recycled magnetite obtained from industrial ferrous scrap was used as an ecofriendly,... more Herein, the recycled magnetite obtained from industrial ferrous scrap was used as an ecofriendly, sustainable iron source in the photo-Fenton degradation of carbamazepine (CBZ), an emerging contaminant in the aqueous environment. Citrate was used as a robust chelating agent to trap and stabilize the iron required for the Fenton reaction. The results proved the formation of the Fe(III)-citrate complex, followed by the reduction of iron to Fe(II) and the formation of harmless molecules such as malonate under UV radiation. The adopted photo-Fenton process in the presence of magnetite (0.3 g L-1), H 2 O 2 (0.5 mM), and citrate (0.1 mM) led to about 77% degradation of CBZ. Then, degradation efficiency was improved to 99% by increasing the prior contact time between citrate and magnetite. In addition, 1 mM of citrate and 2 mM of H 2 O 2 were found to be the optimal values for the degradation of CBZ under the adopted photo-Fenton process. Eventually, the experiments illustrated that the recycled magnetite could be used in the photo-Fenton process in five successive cycles without losing its efficiency.
HAL (Le Centre pour la Communication Scientifique Directe), Nov 16, 2022
Les Mâchefers d'Incinération des Déchets Non-Dangereux (MIDND), sont produits à hauteur de 3 mill... more Les Mâchefers d'Incinération des Déchets Non-Dangereux (MIDND), sont produits à hauteur de 3 millions de tonnes chaque année en France. Leurs granulométrie, compositions élémentaires et propriétés pouzzolaniques font des MIDND de potentiels substituts aux matières premières utilisées dans la mise en oeuvre de mortiers et bétons. Cet article présente les résultats de l'utilisation de la fraction < 2 mm des MIDND comme agent porogène dans des mortiers aérés. Une première étape d'identification des paramètres favorisant l'aération des mortiers a été réalisée sur pâte pure. Les formulations les plus prometteuses ont, par la suite, été mises en oeuvre sur mortier. Les essais de densité, résistance à la compression et conductivité thermique réalisés sur mortiers avec MIDND ont démontré la possibilité d'une telle substitution. En effet des formulations utilisant un rapport Eau/Liant de 0,55 et une quantité de 50 % de mâchefers ont présenté des résultats comparables à ceux du témoin aéré. Des essais de lixiviation suivant la norme EN 12457-2 ont également démontré que ces substitutions n'ont pas d'impact environnemental. En effet, les concentrations en polluants dans les éluâts des mortiers avec mâchefers sont comparables à celles du témoin aéré.
Waste and Biomass Valorization, 2018
MSWI BA in France is reused as a substitute for natural aggregates in building material for road ... more MSWI BA in France is reused as a substitute for natural aggregates in building material for road constructions. Before MSWI BA reuse, treatment operations are generally necessary such as ferrous and non-ferrous metals removal, ageing process, and particle size separation. BA valorization depends on the leaching behavior of the main MTE, which depends on pH. It's well known that ageing process influence the naturel pH of the BA. Initial pH of fresh BA (around 12-13) may decrease until the pH value 8 reached for weathered BA. Ageing process is influenced by different parameters, for example the presence of ferrous metals because of their oxidation and the CO 2 content of the gaseous phase in the porosity of BA. Then, as the ferrous removal is more and more efficient and as the MSWI BA are stored in heaps, limiting the atmospheric exchange, the efficiency of ageing process is no longer certain. The main objective of this study was to measure the efficiency of the ageing process when BA are stored in heap. The mineralogical evolution and the leaching behavior of BA were observed during 7 months. To compare, two artificial ageing processes were carried out on the final sample. All the results showed that when the BA were stored in heap, the ageing process was not efficient. The evolution of pH was very low, showing that the carbonation didn't occur. On the contrary, 'artificial' ageing processes permit to diminish the pH value. Mineralogical characterization showed differences between all the samples. These differences permitted to explain the MTE leaching, especially for lead or antimony.
Http Www Theses Fr, 2003
Composants de puissance et applications CHOCAT B. UNITE DE RECHERCHE EN GENIE CIVIL-Hydrologie ur... more Composants de puissance et applications CHOCAT B. UNITE DE RECHERCHE EN GENIE CIVIL-Hydrologie urbaine COMBESCURE A. MECANIQUE DES CONTACTS COUSIN M. UNITE DE RECHERCHE EN GENIE CIVIL-Structures DAUMAS F. (Mme) CENTRE DE THERMIQUE DE LYON-Energétique et Thermique DOUTHEAU A.
Le Centre pour la Communication Scientifique Directe - HAL - Inria, Aug 25, 2014
Le Centre pour la Communication Scientifique Directe - HAL - Diderot, Oct 21, 2001
Le Centre pour la Communication Scientifique Directe - HAL - Université Paris Descartes, Jun 21, 2016
Le Centre pour la Communication Scientifique Directe - HAL - Diderot, Jun 14, 2021
International audienc
Les éléments traces métalliques (ETM) constituent une restriction environnementale pour le recycl... more Les éléments traces métalliques (ETM) constituent une restriction environnementale pour le recyclage des mâchefers d'incinération des déchets non dangereux (MIDND). L'étude de la spéciation des ETM et des facteurs qui contrôlent leur mobilité permet de prédire le comportement des mâchefers d'incinération dans différentes conditions environnementales et de suggérer ensuite des actions pour élargir leur gestion. Une modélisation géochimique des MIDND a permis de mieux comprendre la spéciation des ETM. Dans cette étude, les éléments ciblés étaient le baryum, le cuivre, le plomb, le nickel et le zinc et les facteurs qui régissent leur mobilité ont été définis. Les résultats montrent que la lixiviation des métaux en fonction du pH dépend principalement des phases minéralogiques ; la matière organique joue également un rôle en tant qu'adsorbant ou complexant dans la lixiviation de certains éléments (Ni, Cu et Pb, notamment).
Le Centre pour la Communication Scientifique Directe - HAL - Université Savoie Mont Blanc, Jul 2, 2018
International audienc
Acta Crystallographica Section C Crystal Structure Communications, 1991
Acta Crystallographica Section C Crystal Structure Communications, 1996
Crystal structures of six (CH3)3SOCdCl3 − xBrx mixed compounds [(1) x = 2.116, (2) x = 1.787, (3)... more Crystal structures of six (CH3)3SOCdCl3 − xBrx mixed compounds [(1) x = 2.116, (2) x = 1.787, (3) x = 1.183, (4) x = 0.962, (5) x = 0.607, (6) x = 0.286] have been determined. Each has space group Pnma and is a structural analogue of (CH3)3SOCdCl3 and (CH3)3SOCdBr3, reported previously. The distribution of Br and Cl atoms among the two anionic sites was especially studied. We have shown that the occupation probabilities are related to the x value but do not vary with it linearly: the Cl atoms marked a preference for the most symmetric site (m symmetry) while the Br atoms were better located on a general position more distant from the Cd ion. It is therefore not possible to describe these mixed compounds in terms of continuous solid solutions series.
Acta Crystallographica Section C Crystal Structure Communications, 1993
Trimethyloxosulfonium dichromate, C 3 H 9 OS + .Cr 2 O 7 - , M r =402.32, monoclinic, P2 1 , a=8.... more Trimethyloxosulfonium dichromate, C 3 H 9 OS + .Cr 2 O 7 - , M r =402.32, monoclinic, P2 1 , a=8.917 (2), b=10.319 (2), c=8.418 (1) A, β=102.30 (5) o , V=756.8 (6) A 3 , Z=2, D m =1.75 (3), D x =1.765 Mg m -3 , λ(Mo Kα)=0.71073 A, μ=1.698 mm -1 , F(000)=412, T=293 K, final R=0.038, wR=0.038 for 2571 independent observed reflections
Acta Crystallographica Section C Crystal Structure Communications, 1994
The trimethyloxosulfonium cations, (CH3)380 + , have the same geometry as in the other salts repo... more The trimethyloxosulfonium cations, (CH3)380 + , have the same geometry as in the other salts reported previously. The C104 anions occupy two different sites of tetrahedral geometry. The first type is regular [C1-O bonds 1.402 (2)A], while the second has an irregular form [C1-O bonds from 1.379 (5) to 1.417 (3)A]; two kinds of tetrahedra are located at the site having m symmetry with occupation factors of 0.5. The structure of this compound has been solved previously [Coulder, Gantzel & McCullough, (1963). Acta Cryst. 16, 676-681] but the old data required refinement. Comment In this series of papers, the iodide, bromide, chloride, nitrate, chromate, chlorocadmate and thiocyanate structures have been reported (Jannin,
Acta Crystallographica Section C Crystal Structure Communications, 1991
Journal of Water Process Engineering
UVA and UVC radiation were compared for the activation of H 2 O 2 or S 2 O 8 2to remove micropoll... more UVA and UVC radiation were compared for the activation of H 2 O 2 or S 2 O 8 2to remove micropollutants remaining in treated wastewater with a view to optimising the cost and/or the efficiency of the commonly studied UVC/H 2 O 2 process. Experiments were carried out in a dynamic laboratory pilot (20 L). In a simple matrix, UVA radiation were able to produce oxydative radicals from H 2 O 2 or S 2 O 8 2-, although faster degradation of the estrogens was observed under UVC radiation (up to 55-fold). With both UV radiation, S 2 O 8 2was photolyzed faster than H 2 O 2 , resulting in faster estrogen degradation (up to 12-fold). Coupling UVA to H 2 O 2 was considered not to be viable because less than 4% of the compounds were degraded at 1000 mJ cm-2. In a treated wastewater, estrogen degradations were inhibited due to organic matter and stronger inhibitions were observed with S 2 O 8 2processes (up to 80% inhibition compared to simple matrix). The UVC/S 2 O 8 2-process still achieved the fastest degradation rate, but is roughly comparable to the UVC/H 2 O 2-process. Very low degradation rates obtained with UVA/S 2 O 8 2limit the interest in the process. Experiments were also carried out on a mixture of pharmaceuticals leading to similar conclusions.
An entry from the Cambridge Structural Database, the world's repository for small molecule cr... more An entry from the Cambridge Structural Database, the world's repository for small molecule crystal structures. The entry contains experimental data from a crystal diffraction study. The deposited dataset for this entry is freely available from the CCDC and typically includes 3D coordinates, cell parameters, space group, experimental conditions and quality measures.
Water Science and Technology, Sep 7, 2023
Separation and Purification Technology
Herein, the recycled magnetite obtained from industrial ferrous scrap was used as an ecofriendly,... more Herein, the recycled magnetite obtained from industrial ferrous scrap was used as an ecofriendly, sustainable iron source in the photo-Fenton degradation of carbamazepine (CBZ), an emerging contaminant in the aqueous environment. Citrate was used as a robust chelating agent to trap and stabilize the iron required for the Fenton reaction. The results proved the formation of the Fe(III)-citrate complex, followed by the reduction of iron to Fe(II) and the formation of harmless molecules such as malonate under UV radiation. The adopted photo-Fenton process in the presence of magnetite (0.3 g L-1), H 2 O 2 (0.5 mM), and citrate (0.1 mM) led to about 77% degradation of CBZ. Then, degradation efficiency was improved to 99% by increasing the prior contact time between citrate and magnetite. In addition, 1 mM of citrate and 2 mM of H 2 O 2 were found to be the optimal values for the degradation of CBZ under the adopted photo-Fenton process. Eventually, the experiments illustrated that the recycled magnetite could be used in the photo-Fenton process in five successive cycles without losing its efficiency.
HAL (Le Centre pour la Communication Scientifique Directe), Nov 16, 2022
Les Mâchefers d'Incinération des Déchets Non-Dangereux (MIDND), sont produits à hauteur de 3 mill... more Les Mâchefers d'Incinération des Déchets Non-Dangereux (MIDND), sont produits à hauteur de 3 millions de tonnes chaque année en France. Leurs granulométrie, compositions élémentaires et propriétés pouzzolaniques font des MIDND de potentiels substituts aux matières premières utilisées dans la mise en oeuvre de mortiers et bétons. Cet article présente les résultats de l'utilisation de la fraction < 2 mm des MIDND comme agent porogène dans des mortiers aérés. Une première étape d'identification des paramètres favorisant l'aération des mortiers a été réalisée sur pâte pure. Les formulations les plus prometteuses ont, par la suite, été mises en oeuvre sur mortier. Les essais de densité, résistance à la compression et conductivité thermique réalisés sur mortiers avec MIDND ont démontré la possibilité d'une telle substitution. En effet des formulations utilisant un rapport Eau/Liant de 0,55 et une quantité de 50 % de mâchefers ont présenté des résultats comparables à ceux du témoin aéré. Des essais de lixiviation suivant la norme EN 12457-2 ont également démontré que ces substitutions n'ont pas d'impact environnemental. En effet, les concentrations en polluants dans les éluâts des mortiers avec mâchefers sont comparables à celles du témoin aéré.
Waste and Biomass Valorization, 2018
MSWI BA in France is reused as a substitute for natural aggregates in building material for road ... more MSWI BA in France is reused as a substitute for natural aggregates in building material for road constructions. Before MSWI BA reuse, treatment operations are generally necessary such as ferrous and non-ferrous metals removal, ageing process, and particle size separation. BA valorization depends on the leaching behavior of the main MTE, which depends on pH. It's well known that ageing process influence the naturel pH of the BA. Initial pH of fresh BA (around 12-13) may decrease until the pH value 8 reached for weathered BA. Ageing process is influenced by different parameters, for example the presence of ferrous metals because of their oxidation and the CO 2 content of the gaseous phase in the porosity of BA. Then, as the ferrous removal is more and more efficient and as the MSWI BA are stored in heaps, limiting the atmospheric exchange, the efficiency of ageing process is no longer certain. The main objective of this study was to measure the efficiency of the ageing process when BA are stored in heap. The mineralogical evolution and the leaching behavior of BA were observed during 7 months. To compare, two artificial ageing processes were carried out on the final sample. All the results showed that when the BA were stored in heap, the ageing process was not efficient. The evolution of pH was very low, showing that the carbonation didn't occur. On the contrary, 'artificial' ageing processes permit to diminish the pH value. Mineralogical characterization showed differences between all the samples. These differences permitted to explain the MTE leaching, especially for lead or antimony.
Http Www Theses Fr, 2003
Composants de puissance et applications CHOCAT B. UNITE DE RECHERCHE EN GENIE CIVIL-Hydrologie ur... more Composants de puissance et applications CHOCAT B. UNITE DE RECHERCHE EN GENIE CIVIL-Hydrologie urbaine COMBESCURE A. MECANIQUE DES CONTACTS COUSIN M. UNITE DE RECHERCHE EN GENIE CIVIL-Structures DAUMAS F. (Mme) CENTRE DE THERMIQUE DE LYON-Energétique et Thermique DOUTHEAU A.
Le Centre pour la Communication Scientifique Directe - HAL - Inria, Aug 25, 2014
Le Centre pour la Communication Scientifique Directe - HAL - Diderot, Oct 21, 2001
Le Centre pour la Communication Scientifique Directe - HAL - Université Paris Descartes, Jun 21, 2016
Le Centre pour la Communication Scientifique Directe - HAL - Diderot, Jun 14, 2021
International audienc
Les éléments traces métalliques (ETM) constituent une restriction environnementale pour le recycl... more Les éléments traces métalliques (ETM) constituent une restriction environnementale pour le recyclage des mâchefers d'incinération des déchets non dangereux (MIDND). L'étude de la spéciation des ETM et des facteurs qui contrôlent leur mobilité permet de prédire le comportement des mâchefers d'incinération dans différentes conditions environnementales et de suggérer ensuite des actions pour élargir leur gestion. Une modélisation géochimique des MIDND a permis de mieux comprendre la spéciation des ETM. Dans cette étude, les éléments ciblés étaient le baryum, le cuivre, le plomb, le nickel et le zinc et les facteurs qui régissent leur mobilité ont été définis. Les résultats montrent que la lixiviation des métaux en fonction du pH dépend principalement des phases minéralogiques ; la matière organique joue également un rôle en tant qu'adsorbant ou complexant dans la lixiviation de certains éléments (Ni, Cu et Pb, notamment).
Le Centre pour la Communication Scientifique Directe - HAL - Université Savoie Mont Blanc, Jul 2, 2018
International audienc
Acta Crystallographica Section C Crystal Structure Communications, 1991
Acta Crystallographica Section C Crystal Structure Communications, 1996
Crystal structures of six (CH3)3SOCdCl3 − xBrx mixed compounds [(1) x = 2.116, (2) x = 1.787, (3)... more Crystal structures of six (CH3)3SOCdCl3 − xBrx mixed compounds [(1) x = 2.116, (2) x = 1.787, (3) x = 1.183, (4) x = 0.962, (5) x = 0.607, (6) x = 0.286] have been determined. Each has space group Pnma and is a structural analogue of (CH3)3SOCdCl3 and (CH3)3SOCdBr3, reported previously. The distribution of Br and Cl atoms among the two anionic sites was especially studied. We have shown that the occupation probabilities are related to the x value but do not vary with it linearly: the Cl atoms marked a preference for the most symmetric site (m symmetry) while the Br atoms were better located on a general position more distant from the Cd ion. It is therefore not possible to describe these mixed compounds in terms of continuous solid solutions series.
Acta Crystallographica Section C Crystal Structure Communications, 1993
Trimethyloxosulfonium dichromate, C 3 H 9 OS + .Cr 2 O 7 - , M r =402.32, monoclinic, P2 1 , a=8.... more Trimethyloxosulfonium dichromate, C 3 H 9 OS + .Cr 2 O 7 - , M r =402.32, monoclinic, P2 1 , a=8.917 (2), b=10.319 (2), c=8.418 (1) A, β=102.30 (5) o , V=756.8 (6) A 3 , Z=2, D m =1.75 (3), D x =1.765 Mg m -3 , λ(Mo Kα)=0.71073 A, μ=1.698 mm -1 , F(000)=412, T=293 K, final R=0.038, wR=0.038 for 2571 independent observed reflections
Acta Crystallographica Section C Crystal Structure Communications, 1994
The trimethyloxosulfonium cations, (CH3)380 + , have the same geometry as in the other salts repo... more The trimethyloxosulfonium cations, (CH3)380 + , have the same geometry as in the other salts reported previously. The C104 anions occupy two different sites of tetrahedral geometry. The first type is regular [C1-O bonds 1.402 (2)A], while the second has an irregular form [C1-O bonds from 1.379 (5) to 1.417 (3)A]; two kinds of tetrahedra are located at the site having m symmetry with occupation factors of 0.5. The structure of this compound has been solved previously [Coulder, Gantzel & McCullough, (1963). Acta Cryst. 16, 676-681] but the old data required refinement. Comment In this series of papers, the iodide, bromide, chloride, nitrate, chromate, chlorocadmate and thiocyanate structures have been reported (Jannin,
Acta Crystallographica Section C Crystal Structure Communications, 1991