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Xiaoyu Zhang,Ying Han,Wenjiao Liu,Ning Pan,Dejie Li,Jinling Chai 한국공업화학회 2021 Journal of Industrial and Engineering Chemistry Vol.97 No.-
A W/O surfactant-free microemulsion (SFME) template-hydrothermal method for the preparation of ZnOproducts was proposed. Using the SFME system containing hexane, propan-2-ol and water, hexagonalcylinder-like (twinning) ZnO microcrystals were synthesized. The XRD, SEM and TEM characterizationsshowed that the synthesized ZnO microcrystals have a hexagonal wurtzite structure. At hydrothermaltemperatures of 120–140 C, hexagonal cylinder-like ZnO microcrystals were synthesized, whereas thehexagonal cylinder twinning ZnO microcrystals were obtained at 160 C. The growth mechanism of theZnO microcrystals was also investigated. The EPR and XPS spectra of the synthesized ZnO products showed that there are oxygen vacancies onthe ZnO surface. The photodegradation behavior of methylene blue (MB, 10 ppm) with a UV-Hg lamp(250 W) as the light source in ZnO aqueous suspension (0.3 g L 1) was investigated. The ZnO productsynthesized at 140 ℃ can significantly photocatalyze the degradation of lower concentration MBsolutions. After 35 min of irradiation, the photocatalytic decomposition rate reached 98.3%. It is hopedthat this work could serve as an important stepping stone for establishing a novel hydrothermal methodbased on SFME system, therefore paving the way for other potential ideas on the application of SFMEsystems.
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Shijing Wang,Weili Rao,Chengli Hou,Raheel Suleman,Zhisheng Zhang,Xiaoyu Chai,Hanxue Tian 한국축산식품학회 2023 한국축산식품학회지 Vol.43 No.6
In order to extend the shelf life of refrigerating raw lamb by inhibiting the growth of microorganisms, preventing the oxidation of fat and protein, and absorbing the juice outflow of lamb during storage, an active packaging system based on plastic/gelatin bilayer film with essential oil was developed in this study. Three kinds of petroleumderived plastic films, oriented polypropylene (OPP), polyethylene terephthalate, and polyethylene, were coated with gelatin to make bilayer films for lamb preservation. The results showed significant improvement in the mechanical properties, oxygen, moisture, and light barriers of the bilayer films compared to the gelatin film. The OPP/gelatin bilayer film was selected for further experiments because of its highest acceptance by panelists. If the amount of juice outflow was less than 350% of the mass of the gelatin layer, it was difficult for the gelatin film to separate from lamb. With the increase in essential oil concentration, the water absorption capacity decreased. The OPP/gelatin bilayer films with 20% mustard or 10% oregano essential oils inhibited the growth of bacteria in lamb and displayed better mechanical properties. Essential oil decreased the brightness and light transmittance of the bilayer films and made the film yellow. In conclusion, our results suggested that the active packaging system based on OPP/gelatin bilayer film was more suitable for raw lamb preservation than single-layer gelatin film or petroleum-derived plastic film, but need further study, including minimizing the amount of essential oil, enhancing the mechanical strength of the gelatin film after water absorption.
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