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One-pot synthesis of metal nanoparticles incorporated in OMS as CPOM catalysts
임제미,김대각,오지환,하경수 한국공업화학회 2015 한국공업화학회 연구논문 초록집 Vol.2015 No.0
One-pot synthesis method is facile and convenient way to prepare catalysts.In this study, metal nanoparticles (Ni or Rh) incorporated in ordered mesoporous silica (OMS) were prepared via one-pot synthesis method. To prevent the metal nanoparticles from being contained inside of OMS wall, amphiphilic metal precursor was utilized. For comparison in morphology and catalytic performance of CPOM, various other catalysts were also prepared using different preparation method or using different kind of precursor. Brunauer-Emmett-Teller (BET) and smallangle X-ray scattering (SAXS) were conducted for investigating surface characteristics of OMS. The morphology of metal nanoparticles incorporated in OMS was also confirmed using transmission electron microscopy (TEM) and wide-angle X-ray diffraction (WAXRD). Regarding the measurement of catalytic performance, gas chromatography (GC) was employed.
윤솔,박호석 한국공업화학회 2016 한국공업화학회 연구논문 초록집 Vol.2016 No.1
The hierarchical architecturing and hybridization of iron oxide is important for achieving multifunctional capability that makes it possible for practical applications. In particular, hierarchical architecturing of graphene/iron oxide hybrids in a three-dimensionally (3D) manner is expected to become an innovative chemical approach for full potential of respective functionality. In this study, hierarchically structured rGO/α-Fe<sub>2</sub>O<sub>3</sub> nanoblock hybrids (hrGO/α-Fe NBhs) are synthesized via a one-pot, hydrothermal self-assembly process. All in one synthetic approach is simple yet useful for simultaneously constructing 3D macroscopic rGO structures and growing α-Fe<sub>2</sub>O<sub>3</sub> NBs. The discrete α- Fe<sub>2</sub>O<sub>3</sub> NBs are uniformly distributed on the surface of the hrGO/α-Fe and confined in the 3D architecture, thereby inhibiting the restacking of rGO layers and maximizing their functionalities. In order to demonstrate the superiority of the hrGO/α-Fe NBhs, we applied them into lithium ion battery anodes.
( Hei Chan Lee ),( Seung Don Lee ),( Jae Kyung Sohng ),( Kwang Kyoung Liou ) 생화학분자생물학회 2004 BMB Reports Vol.37 No.4
Glucose-l-phosphate uridylyltransferase from E. coli K12 was used to convert uridine-5`-triphosphate and glucose-l-phosphate to UDP-D-glucose. The conversion was efficient and completed within 5 minutes under the employed conditions. In addition, thymidine-5`-monophosphate kinase and acetate kinase were proven to be non-specific, converting udridine-5`-monophosphate to uridine-5`-triphosphate with 55% conversion after 6 h, which was much slower than the production of TTP under the same conditions (complete conversion within one hour). Since these two reactions could proceed under the same conditions, a one-pot synthesis of UDP-D-glucose with ATP regeneration was designed from easily available starting materials, and conversion up to 40% by HPLC peak integration was achieved given a reaction time of 4 h.
Choi, Brian Hyun,Jung, Kyung-Won,Choi, Jae-Woo,Lee, Sang-Hyup,Lee, Young Jae,Ahn, Kyu-Hong ELSEVIER 2017 Journal of Cleaner Production Vol. No.
<P><B>Abstract</B></P> <P>This study presents a direct and simple one-pot synthesis of 2-methylimidazole grafted poly-vinylbenzyl chloride (<SUP>2-Me</SUP>Im-pVBC) using radical polymerization, followed by its studies on the removal of structurally diverse mono and di-azo dyes (Acid Orange 7 (AO7), Acid Yellow 17 (AY17), and Acid Black 1 (AB1)) from aqueous media. Characterization of the material, effect of key factors such as dosage and pH on substrate removal, adsorption kinetics and isotherms, removal selectivity of the examined dyes, and reusability of the adsorbent were assessed. The prepared polymeric material exhibited outstanding removal activity with respect to all three dyes at a wide range of pH, with no significant impact due to the chemical complexity of the substrate. Adsorption kinetics and isotherm studies showcases supreme and rapid affinity towards AO7, with a maximum adsorption capacity of around 2012 mg/g. Lastly, <SUP>2-Me</SUP>Im-pVBC exhibited its sustainability by maintaining 8 cycles of adsorption-desorption process with outstanding substrate removal rate. Therefore, <SUP>2-Me</SUP>Im-pVBC demonstrated promising adsorption performance and exceptional selectivity on all three examined substrates, which can be further developed as an efficient agent for removing synthetic dyes in aqueous system.</P> <P><B>Highlights</B></P> <P> <UL> <LI> Facile one-pot synthesis of imidazole-grafted polymer was performed. </LI> <LI> <SUP>2-Me</SUP>Im-pVBC exhibits superb removal of azo dyes from aqueous media. </LI> <LI> Adsorption capacities of the dyes depends on the electronic states of the dyes. </LI> <LI> <SUP>2-Me</SUP>Im-pVBC delineates high selectivity to azo dyes with high adsorption capacity. </LI> </UL> </P> <P><B>Graphical abstract</B></P> <P>[DISPLAY OMISSION]</P>
Balwe, Sandip Gangadhar,Lim, Kwon Taek,Cho, Byung Gwon,Jeong, Yeon Tae Pergamon Press 2017 Tetrahedron Vol.73 No.25
<P><B>Abstract</B></P> <P>A catalyst-free, environmentally benign, and simple one-pot multi-component protocol has been developed for the efficient synthesis of novel (benzo[<I>d</I>]imidazo[2,1-<I>b</I>]thiazol-3-yl)-2H-chromen-2-one derivatives in excellent yields using ethanol-PEG-600. This novel and green protocol have the advantages of shorter reaction times, high conversions, and follow the group-assisted-purification (GAP) chemistry process, which can avoid traditional purifications, chromatography and recrystallization. This is the first report for the synthesis of benzo[<I>d</I>]imidazo[2,1-<I>b</I>]thiazol-3-yl)-2H-chromen-2-one.</P> <P><B>Graphical abstract</B></P> <P>[DISPLAY OMISSION]</P>
Choi, Juhyung,Seong, Kwang-dong,Kang, Jeongmin,Hwang, Minsik,Kim, Jong Min,Jin, Xuanzhen,Piao, Yuanzhe Elsevier 2018 ELECTROCHIMICA ACTA Vol.279 No.-
<P><B>Abstract</B></P> <P>A one-pot facile hydrothermal synthesis of fluorine-doped CoFe<SUB>2</SUB>O<SUB>4</SUB> sphere (FS-CoFe<SUB>2</SUB>O<SUB>4</SUB>)/graphene sheet (GS) composites, based on the Ostwald ripening mechanism, is presented in this work. Incorporation of fluorine in CoFe<SUB>2</SUB>O<SUB>4</SUB>/GS improves ion diffusion by forming a highly porous structure that serves as an electrolyte reservoir during the redox reactions and facilitates charge transfer in the electrode material. The influence of the fluorine concentration on the relationship between structure and electrochemical performance of CoFe<SUB>2</SUB>O<SUB>4</SUB>/GS is also studied. The FS-CoFe<SUB>2</SUB>O<SUB>4</SUB>/GS composite exhibits a high specific capacity of 288 C g<SUP>−1</SUP> at a current density of 1 A g<SUP>−1</SUP>, along with an excellent rate capability of 80% (230 C g<SUP>−1</SUP> at a current density of 10 A g<SUP>−1</SUP>). Moreover, the FS-CoFe<SUB>2</SUB>O<SUB>4</SUB>/GS composite is used to assemble a hybrid supercapacitor, which exhibits a high operating voltage of 1.6 V and delivers a high energy density of 28.4 Wh kg<SUP>−1</SUP> at a power density of 0.9 kW kg<SUP>−1</SUP>, as well as an outstanding cycling performance (90% capacity retention after 20,000 cycles, in which the GSs support FS-CoFe<SUB>2</SUB>O<SUB>4</SUB> for the whole duration of the cycling tests). The present study can open up a new avenue for exploiting fluorine as a dopant in high-performance hybrid supercapacitors.</P> <P><B>Highlights</B></P> <P> <UL> <LI> Fluorine-doped CoFe<SUB>2</SUB>O<SUB>4</SUB>/Graphene sheet composites were prepared by one-pot facile hydrothermal synthesis. </LI> <LI> The nanocomposite exhibits a high specific capacity of 288 C g<SUP>−1</SUP> at 1 A g<SUP>−1</SUP> in a three-electrode system. </LI> <LI> The influence of the fluorine concentration of CoFe<SUB>2</SUB>O<SUB>4</SUB>/GS is studied. </LI> <LI> A hybrid supercapacitor using the nanocomposite exhibits excellent rate capability and cycling stability. </LI> </UL> </P> <P><B>Graphical abstract</B></P> <P>The paper reported Fluorine-doped CoFe<SUB>2</SUB>O<SUB>4</SUB>/Graphene sheet composites through one-pot facile hydrothermal synthesis. A hybrid supercapacitor using incorporation of fluorine in CoFe<SUB>2</SUB>O<SUB>4</SUB>/GS composites exhibits excellent rate capability and cycling stability.</P> <P>[DISPLAY OMISSION]</P>
One‐pot synthesis of 2‐imino‐1,3,4‐thiadiazolines from acylhydrazides and isothiocyanates
Kim Su Been,Baek Sang Eun,Lim Jae Hyeok,Kim Jinho 대한화학회 2022 Bulletin of the Korean Chemical Society Vol.43 No.8
A one-pot synthesis of 2-imino-1,3,4-thiadiazolines was successfully achieved under mild conditions. The developed synthesis involves Fe(Pc)-catalyzed aerobic oxidation of acylhydrazides followed by P(NMe2)3-mediated annulation of the in situ generated N-acyldiazene with isothiocyanates. The present annulation showed broad substrate scope with good functional group tolerance, and was effective on gram scale.
Vaishali Vajpayee,Young Ho Song,Jeong Soo Ahn,지기환 대한화학회 2011 Bulletin of the Korean Chemical Society Vol.32 No.8
One-pot homo- and cross-coupling reactions of arenediazonium tosylate salts bearing a halogen group have been exploited for the synthesis of biaryls and polyaryls under mild conditions. Pd(OAc)_2 has proven to be an efficient catalyst for the successful dual transformation of diazonium salts into p-quaterphenyl (3).