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Miaomiao Song,Wenjiao Liu,Qian Wang,Jiao Wang,Jinling Chai 한국공업화학회 2020 Journal of Industrial and Engineering Chemistry Vol.83 No.-
The microstructure, micropolarity and solubilizations of a surfactant-free microemulsion (SFME)containing diethyl malonate (DEM), ethanol (EtOH), and water were investigated in details. The ternaryphase diagram of the SFME was constructed, and the single-phase region of the diagram was divided intooil in water (O/W), bicontinuous (B.C.), and water in oil (W/O) subregions. The dynamic light scattering(DLS) results showed that there is an orderly microstructure in each subregion of the system. The UV–visabsorbance spectra of CoCl2 indicated the formation of complete W/O SFME droplets, when the watercontent is relatively large. With an increase in water content, the association between Cu2+ and watermolecules increases, resulting in a red shift of the UV–vis absorbance spectra of CuCl2. The solubilizationof K3Fe(CN)6 in the W/O SFME was investigated, and found that the SFME has better solubilization effecton inorganic salts. Riboflavin also has a strong solubilizing effect in the W/O SFME, and the absorbanceconforms to Lambert–Beer’s law. When the water content is small, the absorbance deviates fromLambert–Beer’s law. This is in agreement with the results of the solubilization of CoCl2. A complete W/OSFME could be formed when the water mass fraction (W) exceeds 0.10.
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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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