Metal Organic Frameworks as Dual Functional Adsorbent/Catalysts for Plasma Air Purification Systems
Notice bibliographique
Résumé
Indoor air pollution is responsible for the annual premature death of millions of people worldwide. Volatile organic compounds (VOCs) are among these pollutants with proven detrimental effects on occupants’ health. Plasma-based methods’ capabilities for VOCs degradation have motivated designers to employ these methods for purifying indoor air environment. It has been demonstrated that utilizing a dual functional adsorbent/catalyst (DFA/C) in a plasma system can significantly enhance the VOCs removal and the system’s energy efficiency. However, selecting an appropriate DFA/C has remained a challenge. \nFor the first time, this research attempted to utilize metal organic frameworks (MOFs) as DFA/Cs for a plasma-driven catalytic reactor. Accordingly, three different MOFs, MIL-101 (MIL: Material Institute Lavoisier), MIL-53, and CPM-5 (CPM: Crystalline Porous Material-5) were synthesized through microwave and solvothermal methods. Furthermore, for the first time, a mechanochemical method was developed to synthesize CPM-5. To test the performance of the developed MOFs, a non-thermal plasma dielectric barrier discharge (DBD) system was designed, set-up and calibrated. Several adsorption and oxidation experiments were performed to study the physical and chemical behaviors of these MOFs for the removal of toluene and isobutanol. Also, the effect of the presence of humidity on the adsorption/oxidation capacities of MOFs was investigated. \nFurther analyses were carried out to study the surface characteristic of the developed MOFs using X-ray diffraction (XRD), scanning electron microscopy (SEM), BET surface area analysis, and thermogravimetric analysis (TGA). The results for microwave-synthesized MIL-53 and CPM-5 and also solvothermal-synthesized MIL-101 showed a good crystallinity, very high specific surface area (SLangmuir: 1275-3747 m2/g), and acceptable thermal stability. In the case of mechanochemical-synthesized CPM-5, the TGA analysis showed a similar thermal stability compared to the microwave-synthesized CPM-5. However, the SEM micrographs showed a formation of different morphology of crystallites. Also, the surface area of the mechanochemical-synthesized CPM-5 was lower than the one synthesized by the microwave method. \nThe adsorption isotherms of toluene and isobutanol demonstrated the physisorption of these MOFs. This result was also confirmed by TGA characterization of samples before and after toluene adsorption. In addition, oxidation evaluation studies exhibited VOCs removal potential over these MOFs. MIL-101 and MIL-53 exhibited superior adsorption and oxidation ability than CPM-5 in most cases. Results also showed higher adsorption capacity of MIL-101 than MIL-53 in dry conditions but almost the same oxidation efficiency. Nevertheless, adsorption/oxidation capacities of MIL-53 surpassed MIL-101 in the presence of 30% relative humidity. Moreover, Fourier transform infrared spectroscopy (FTIR) showed the stable structure of the examined MOFs after plasma-catalytic reactions, which indicated they were easy to be regenerated. \nDuring the course of plasma-catalytic oxidation of toluene and isobutanol, different organic by-products and ozone were detected. Results showed utilization of a MOF as catalyst in the plasma system can reduce the downstream ozone concentration. Moreover, the presence of humidity suppressed the amount of ozone generation. \nIn conclusion, results demonstrated the potential capacity of MIL-53 and MIL-101 as DFA/Cs in plasma-catalyst air purification system.
Récupéré en direct depuis OpenAlex et désinversé. Les résumés ne sont pas conservés dans cette base de données : les index inversés représentent 8,6 Go des 9,3 Go de texte de la base, et le serveur dispose de 13 Go libres.
Comment cette classification a été obtenuedéplier
Prédiction distillée sur la base complète
Imitation des enseignantsNi prévalence calibrée, ni vérité terrain. Validation humaine à venir. Apprise à partir de 10 348 étiquettes directes de Codex et de 10 348 étiquettes directes de Gemma. Le mode candidate est l'union des têtes enseignantes seuillées; le consensus est leur intersection. Ces sorties portent le statut machine_predicted_unvalidated et ne sont ni des étiquettes humaines ni des étiquettes directes de modèles de pointe.
Scores Codex et Gemma par catégorie
| Catégorie | Codex | Gemma |
|---|---|---|
| Métarecherche | 0,001 | 0,001 |
| Méta-épidémiologie (sens strict) | 0,001 | 0,001 |
| Méta-épidémiologie (sens large) | 0,001 | 0,001 |
| Bibliométrie | 0,001 | 0,001 |
| Études des sciences et des technologies | 0,002 | 0,000 |
| Communication savante | 0,000 | 0,000 |
| Science ouverte | 0,001 | 0,000 |
| Intégrité de la recherche | 0,002 | 0,002 |
| Charge utile insuffisante (le modèle a refusé de juger) | 0,001 | 0,001 |
Scores machine (provisoires)
Les deux têtes enseignantes du modèle étudiant, lues sur ce travail. Un score ordonne la base pour la relecture; il n'affirme jamais une catégorie, et le statut de validation accompagne chaque rangée tel quel.
Scores de référence d'un modèle non mature (critères de maturité non atteints, 7 itérations). Un score ordonne; il n'affirme jamais une catégorie.
score_only:v0-immature-baseline · tel quel depuis la passe de notation : score_only signifie que le nombre peut ordonner les travaux, et qu'aucune étiquette de catégorie n'en découleClassification
machine, non validéePrédiction automatique; les deux têtes enseignantes s’accordent sur ce qui est montré ici.
Le détail, modèle par modèle et score par score, se trouve en fin de page sous « Comment cette classification a été obtenue ».