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AppliedChem, Volume 4, Issue 3 (September 2024) – 2 articles

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34 pages, 21055 KiB  
Review
Polymeric and Crystalline Materials for Effective and Sustainable CO2 Capture
by David Gendron and Maria Zakharova
AppliedChem 2024, 4(3), 236-269; https://doi.org/10.3390/appliedchem4030016 - 26 Jun 2024
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Abstract
Carbon dioxide (CO2) is recognized as the primary cause of global warming due to its greenhouse potential. It plays a significant role in contributing to the emissions arising from a variety of anthropogenic activities, such as energy production, transportation, the construction [...] Read more.
Carbon dioxide (CO2) is recognized as the primary cause of global warming due to its greenhouse potential. It plays a significant role in contributing to the emissions arising from a variety of anthropogenic activities, such as energy production, transportation, the construction industry, and other industrial processes. Capturing and utilizing CO2 to mitigate its impact on the environment is, therefore, of significant importance. To do so, strategies such as net-zero strategies, deploying capture and storage technologies, and converting CO2 into useful products have been proposed. In this review, we focused our attention on the preparation and performance of polymeric and crystalline materials for efficient CO2 capture. More precisely, we examined MOFs, petroleum-based polymers (amine-based, polymeric ionic liquid, ionic polymer, conjugated macro/micro-cyclic polymer, and porous organic polymer) as well as bio-based polymers for CO2 capture. In brief, the present work aims to guide the reader on the available crafted polymeric and crystalline materials offering a promising avenue towards innovative carbon dioxide capture strategy. Full article
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12 pages, 2661 KiB  
Article
Absolute Rate Constants for the Reaction of Benzil and 2,2′-Furil Triplet with Substituted Phenols in the Ionic Liquid 1-Butyl-3-methylimidazolium Hexafluorophosphate: A Nanosecond Laser Flash Photolysis Study
by Ada Ruth Bertoti and José Carlos Netto-Ferreira
AppliedChem 2024, 4(3), 224-235; https://doi.org/10.3390/appliedchem4030015 - 26 Jun 2024
Viewed by 602
Abstract
The triplet excited state reactivity towards phenolic hydrogen of the α-diketones benzil and 2,2′-furil in the ionic liquid 1-n-butyl-3-methyl imidazolium hexafluorophosphate [bmim.PF6] was investigated employing the nanosecond laser flash photolysis technique. Irradiation (λmax = 355 nm) of benzil [...] Read more.
The triplet excited state reactivity towards phenolic hydrogen of the α-diketones benzil and 2,2′-furil in the ionic liquid 1-n-butyl-3-methyl imidazolium hexafluorophosphate [bmim.PF6] was investigated employing the nanosecond laser flash photolysis technique. Irradiation (λmax = 355 nm) of benzil yields its triplet excited state with λmax at 480 nm and τT = 9.6 μs. Under the same conditions, 2,2′-furil shows a triplet-triplet absorption spectrum with bands at 380, 410, 450, and 650 nm and τT = 1.4 μs. Quenching rate constants (kq) of the reaction between benzil triplet and substituted phenols ranged from 1.4 × 107 L mol−1 s−1 (para-chlorophenol) to 1.8 × 108 L mol−1 s−1 (para-methoxyphenol). A new transient was formed in all cases, assigned to the benzil ketyl. Similar results were obtained for the quenching of 2,2′-furil triplet by phenols, for which kq ranged from 1.9 × 108 L mol−1 s−1 (para-chlorophenol) to 2.2 × 108 L mol−1 s−1 (para-methoxyphenol). The 2,2′-furil ketyl radical was also observed in all cases (λmax = 380 nm). The quenching rate constants are almost independent of the substituent and diffusion-controlled (kq ~ 108 L mol−1 s−1). The proposed mechanism for the phenolic hydrogen abstraction by benzil and 2,2′-furil triplet may involve a proton-coupled electron transfer reaction, ultimately leading to the radical pair ketyl/aryloxyl. Full article
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