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- 저자 : Yane Yan (검색결과 2 건)
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Design of Co3O4/CeO2–Co3O4 hierarchical binary oxides for the catalytic oxidation of dibromomethane
Jian Mei,Jiangkun Xie,Yaning Sun,Zan Qu,Naiqiang Yan 한국공업화학회 2019 Journal of Industrial and Engineering Chemistry Vol.73 No.-
Developing the catalysts that can efficiently degrade brominated volatile organic compounds (Br-VOCs)is a priority due to the low activity, the low product selectivity, and the low resistance to Br-poisoning. Inthis work, Co3O4/CeO2–Co3O4 hierarchical binary oxides were designed as a high-performance catalystfor the catalytic oxidation of dibromomethane (CH2Br2) as a model pollutant for Br-VOCs. The surface ofcarbon spheres was coated with a layer of CeO2 nanoparticles, and core-shell CSs@CeO2 were theprecursors of Co3O4/CeO2–Co3O4 hierarchical binary oxides. Co3O4/CeO2–Co3O4(HS) had a hierarchicalporous structure, there was a strong interaction between Co3O4 and CeO2 Co3O4/CeO2–Co3O4(HS)showed an excellent catalytic activity, and its T90 value was only 321 C. Meanwhile, Co3O4/CeO2–Co3O4(HS) showed good stability for at least 30 h. Co3O4 provided the active sites for CH2Br2 oxidation,and the hierarchical porous structure and high specific surface area were conducive to the adsorption ofCH2Br2 molecules. Meanwhile, CeO2 promoted the oxygen mobility of the composite and the oxidationperformance of Co3O4. CH2Br2 molecularfirstly adsorbed on Co3O4/CeO2–Co3O4(HS) surface, anddissociated to form the intermediates (i.e., formate species, and methoxy species), which werefinallyoxidized to CO and CO2, and Br species were removed in the form of HBr and Br2.
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Caihong Zhang,Huiying Fan,Jieqiong Xia,Honghua Guo,Xinjun Jiang,Yane Yan 한국간호과학회 2017 Asian Nursing Research Vol.11 No.3
Purpose: The aim of this study was to evaluate the effects of reflective trainings for nursing students on their critical thinking disposition. Methods: A total of 157 senior undergraduate nursing students sampled from Hainan Medical University in China participated in this study in 2014. They were randomly divided into experimental and control groups. The experimental group students were provided the reflective training during their entire 12-month clinical internship, whereas students in the control group were requested to keep their reflective diaries but without a formal training. Before and after the intervention, nursing students' critical thinking disposition was rated using the Chinese version of Critical Thinking Disposition Inventory (CTDI-CV). Results: Before the start of the intervention, the critical thinking disposition scores of the two groups had no significant differences. At the end of the intervention, it was found that the experimental students performed better in each subscale of CTDI-CV. These include the search for truth, open mind, analytical ability, systematic ability, critical thinking, self-confidence, curiosity, and cognitive maturity. By summing the scores of all categories, the results showed that the experimental group had a significantly higher total score than that of the control group (p ≤ .044). Evaluating the score difference in each function indicated that there was a range of improvements on the critical thinking disposition because of the reflective training intervention. Conclusion: Reflective training during the internship period improves nursing students' disposition of critical thinking and promotes their readiness for their clinical practices in the rapidly increasing demands of the healthcare field.
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