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<dc:title xml:lang="fr">Développement et optimisation de matériaux pour la dépollution du formaldéhyde et de l'acétaldéhyde en air intérieur par adsorption sélective</dc:title>
<dcterms:alternative xml:lang="en">Materials development and optimization for the removal of formaldehyde and acetaldehyde in indoor air by selective adsorption</dcterms:alternative>
<dc:subject xml:lang="fr">Formaldéhyde</dc:subject>
<dc:subject xml:lang="fr">Acétaldéhyde</dc:subject>
<dc:subject xml:lang="fr">Air intérieur</dc:subject>
<dc:subject xml:lang="fr">Adsorption</dc:subject>
<dc:subject xml:lang="fr">Chimisorption</dc:subject>
<dc:subject xml:lang="fr">Physisorption</dc:subject>
<dc:subject xml:lang="fr">Charbon actif</dc:subject>
<dc:subject xml:lang="fr">Silice</dc:subject>
<dc:subject xml:lang="fr">Zéolite</dc:subject>
<dc:subject xml:lang="fr">Tris(hydroxymethyl)aminomethane</dc:subject>
<dc:subject xml:lang="fr">Capacité d’adsorption</dc:subject>
<dc:subject xml:lang="en">Formaldehyde</dc:subject>
<dc:subject xml:lang="en">Acetaldehyde</dc:subject>
<dc:subject xml:lang="en">Indoor air</dc:subject>
<dc:subject xml:lang="en">Adsorption</dc:subject>
<dc:subject xml:lang="en">Physisorption</dc:subject>
<dc:subject xml:lang="en">Chemisorption</dc:subject>
<dc:subject xml:lang="en">Activated carbon</dc:subject>
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<dc:subject xml:lang="en">Tris(hydroxymethyl)aminomethane</dc:subject>
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<dcterms:abstract xml:lang="fr">Cette thèse se consacre au développement de matériaux adsorbants spécifiques au formaldéhyde et à l’acétaldéhyde. Pour cela, plusieurs matériaux dont des membranes fibreuses, des peintures, des charbons actifs, des zéolites, une silice mésoporeuse, et une silice standard ont été fonctionnalisés avec du tris(hydroxymethyl)aminomethane (THAM). Les capacités d’adsorption de ces matériaux (à l’exception des peintures) ont été obtenues à différentes températures, humidités relatives, et concentrations d’aldéhyde. Les résultats ont montré que le THAM doit être sous sa forme amorphe pour adsorber les aldéhydes. A cause de leur fragilité et de la présence de cristaux de THAM à leur surface, l’adsorption sur les membranes fibreuses fut que peu concluante. Pour les autres matériaux, leurs capacités d’adsorption vis-à-vis des deux aldéhydes diminuaient en condition humide et cette diminution était plus marquée quand le matériau était hydrophile. Alors que pour l’adsorption de l’acétaldéhyde, la silice standard avait des résultats similaires au charbons actifs, l’adsorption du formaldéhyde sur la silice imprégnée a dépassé les valeurs maximales attendues dans le cas d’une chimisorption suggérant l’apparition d’un nouveau processus d’adsorption.</dcterms:abstract>
<dcterms:abstract xml:lang="en">This thesis is devoted to the development of adsorbents specific to formaldehyde and acetaldehyde. To this end, various materials including fibrous membranes, paints, activated carbons, zeolites, a mesoporous silica, and a standard silica were functionalised with tris(hydroxymethyl)aminomethane (THAM). The adsorption capacities of these materials (at the exception of the paints) were obtained at different temperature, relative humidities, and aldehyde concentrations. The results showed that THAM adsorbed aldehydes only under its amorphous form. Due to their lack of resistance and the presence of THAM crystals at their surface, adsorption on fibrous membranes were only slightly conclusive. For these other materials, the adsorption capacity of both aldehydes decreased under humid condition, and this decrease was steeper the more the material was hydrophilic. While the standard silica and the activated carbons were almost as efficient for the adsorption of acetaldehyde, formaldehyde adsorption onto the silica surpassed the theoretical maximal values in the case of a chemisorption suggesting the emergence of a new adsorption process.</dcterms:abstract>
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