Cellulose-based aerogels modulate fragrance adsorption and controlled release by carbonization/in-situ aromatization.

Fragrances are indispensable additives in consumer products including foods, cosmetics, and tobacco products. However, their inherent instability leads to rapid quality degradation and performance loss, driving the urgent need for controlled-release systems to stabilize fragrance performance. In this work, cellulose nanofibers (CNF) were used to prepare CNF aerogel-like gels (CA) and carbonized CNF aerogels (C-CA) through freeze-drying and high-temperature carbonization.

Preparation, characterization and host-guest interaction of photothermal-responsive modified carboxymethyl chitosan microcapsules.

Heterocyclic fragrance compounds possess unique aromas that can enhance flavor of products, but their applications are limited due to high volatility, short storage durations, and thermal instability. This paper used porphyrin grafted carboxymethyl chitosan (CMCS) as wall material and selected four heterocyclic fragrance compounds as core materials to develop an effective controlled release system of photothermal-responsive microcapsules. The optimal preparation process for microcapsules was determined through response surface methodology (RSM).

Formation and stabilization mechanism of heterocyclic aroma compounds / β-CD/CS microcapsules.

Heterocyclic aroma compounds are a type of edible fragrances with strong nutty and baking aromas, which can improve food flavor. However, their applications are limited due to high volatility and poor stability. Therefore, the development of effective controlled release technologies is required.

Advancements in cobalt-based oxide catalysts for soot oxidation: Enhancing catalytic performance through modification and morphology control.

The widespread use of diesel engines results in significant environmental contamination due to emitted pollutants, particularly soot particles. These pollutants are detrimental to public health. At present, one of the most effective ways to remove soot particles is the catalytic diesel particulate filter after-treatment technology, which requires the catalyst to have superior low temperature activity.

Enhancement of carbon monoxide catalytic oxidation performance by co-doping silver and cerium in three-dimensionally ordered macroporous Co-based catalyst.

Carbon monoxide (CO) catalytic oxidation offers an effective solution for environmental pollutant; however, its progress is limited by sluggish kinetics, and efficient catalysts remain scarce. Herein, we prepared Ag-Ce co-doped three-dimensionally ordered macroporous (3DOM) Co-based catalysts through the synergistic approach of co-doping and morphology control, systematically investigating their CO catalytic oxidation mechanisms. The appropriate amount of Ag-Ce co-doping maintained the original 3DOM structure, promote the mass transfer and diffusion of CO, promoted the redox capacity by increasing the ratio of Co to surface reactive oxygen species (O/ O), achieving low temperature conversion of CO.

Insights into bacterial cellulose for adsorption and sustained-release mechanism of flavors.

The stabilities and sustained-release properties of citral are significant for foods. Herein, bacterial cellulose (BC) was innovatively reported for adsorption and sustained-release of citral via gas-phase adsorption technique, and the adsorption mechanism was disclosed. BC was prepared from tobacco stem waste extract (TSWE), and better adsorption capacity (124.

Active Interfacial Perimeter in Pt/CeO Catalysts with Embedding Structure for Water-Tolerant Toluene Combustion.

Supported Pt catalysts are often subjected to severe deactivation under the conditions of high temperature and water vapor in catalytic oxidation; thus, the superior stability and water-resistant ability of catalysts have great significance for the effective degradation of volatile organic compounds (VOCs). Herein, we constructed a Pt/CeO-N catalyst with an active interfacial perimeter, in which Pt species were partially embedded in the defective CeO-N support to prevent the sintering. A significant charge transfer between Pt species and ceria in the embedding structure occurred via the Pt-CeO interface, which induced the formation of a Pt-O-Ce interfacial structure.

Preparation and properties of thermal responsive 2,3-diethyl-5-methylpyrazine fragrance microcapsules with β-CD/CS as wall materials.

2,3-Diethyl-5-methylpyrazine (DEMP) is recognized for its unique nutty scent but faces limitations due to rapid evaporation. The primary objective of this study was to explore the effect of incorporating DEMP with β-cyclodextrin (β-CD) and chitosan (CS) as wall material on the microstructure and thermal release behavior, antibacterial, and antioxidant characteristics. Initially, the microcapsules preparation process underwent optimization with embedding rate of 78.

Boosting Toluene Combustion by Tuning Electronic Metal-Support Interactions in In Situ Grown Pt@CoO Catalysts.

Electronic metal-support interaction (EMSI) has attracted great attention in volatile organic compound (VOC) abatement. Herein, Pt@CoO catalysts were prepared via a metal-organic framework (MOF) in situ growth approach to boost toluene degradation. The partial electron transfer from CoO to Pt species was induced by the EMSI effect to generate the electron-rich Pt and Co species.

Metal organic framework-templated fabrication of exposed surface defect-enriched CoO catalysts for efficient toluene oxidation.

Exposed surface defect-enriched CoO catalysts derived from metal organic framework (MOF) were fabricated by the promotion of surface Mn species for toluene oxidation. The incorporation of Mn species into CoO surface lattice could give rise to the local lattice distortion in spinel structure, resulting in highly exposed surface defect rather than bulk defect. More Co species were also exposed on the surface of MnO/CoO samples owing to the electron transfer from Co to Mn species by the occupation of surface Mn in octahedral Co sites.

Boosting benzene combustion by engineering oxygen vacancy-mediated Ag/CeO-CoO catalyst via interfacial electron transfer.

Oxygen vacancy (O) engineering is a widely accepted effective strategy to manipulate the catalytic activity for volatile organic compounds (VOCs) abatement. Herein, we report the oxygen vacancy-mediated Ag/CeO-CoO catalyst to boost benzene combustion. The incorporation of Ag species in Ag/CeO-CoO induces the predominately exposed surface Co sites and structural distortion of CoO as well as rich oxygen vacancy owing to the improved interfacial electron transfer, which promote the adsorption of benzene and the dissociation of oxygen.