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- 저자 : Tran Quang Toan (검색결과 4 건)
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Robust graphene-wrapped PtNi nanosponge for enhanced oxygen reduction reaction performance
Tran, Quoc Chinh,An, Hyesung,Ha, Hyunwoo,Nguyen, Van Toan,Quang, Nguyen Duc,Kim, Hyun You,Choi, Ho-Suk The Royal Society of Chemistry 2018 Journal of Materials Chemistry A Vol.6 No.18
<P>We synthesize a graphene-wrapped 3D-PtNi nanosponge (G-PtNi NS) using formic acid as a reducing agent and carbon dots as a structure-directing agent at room temperature. Reduced Ni and Pt atoms initiate the exfoliation of carbon dots into graphene dots, which eventually encapsulate the PtNi nanocrystals. The strong Pt-carbon interaction propels the formation of the G-PtNi NS with large specific surface area and good long-term stability. The G-PtNi NS shows high reactivity for an oxygen reduction reaction (ORR). The ORR activity is maintained even after 3000 cycles. We confirm that the graphene layers physically stabilize the PtNi NS and chemically adjust the oxygen affinity of the PtNi NS, which both positively contribute to the ORR performance.</P>
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Nguyen, Van-Toan,Tran, Quoc Chinh,Quang, Nguyen Duc,Nguyen, Ngoc-Anh,Bui, Van-Tien,Dao, Van-Duong,Choi, Ho-Suk Elsevier 2018 Journal of alloys and compounds Vol.766 No.-
<P><B>Abstract</B></P> <P>The improvement of the catalytic performance for methanol and formic acid oxidation reactions remains a key issue for the development of a new generation of direct methanol and formic acid fuel cells. This study reports a simple approach, using selective chemical etching for the synthesis of unique nitrogen-doped carbon dot/Pt<SUB>84</SUB>Pd<SUB>16</SUB> (N-Cdot/Pt<SUB>84</SUB>Pd<SUB>16</SUB>) nano-network structure at room temperature with excellent electrocatalytic properties. The obtained nano-network hybrid material exhibits significant enhancement of the electrocatalytic activity for the electro-oxidation reaction of both methanol and formic acid with current densities of 999.0 and 1919.5 mA/mg<SUB>metal</SUB>, respectively, compared with the commercial ones of 751.32 and 806.02 mA/mg<SUB>metal</SUB>, respectively. Furthermore, the N-Cdot/Pt<SUB>84</SUB>Pd<SUB>16</SUB> nano-network hybrid materials exhibit excellent stability and hydrophilic dispersibility at room temperature.</P> <P><B>Highlights</B></P> <P> <UL> <LI> N-Cdot/PtPd nanonetwork hybrid material is synthesized at room temperature. </LI> <LI> A simple coreduction and a selective chemical etching are applied to the synthesis. </LI> <LI> It generates a nano-network structure with excellent electrocatalytic properties. </LI> <LI> N-Cdot functions as a uniform interconnection between the nanohybrid materials. </LI> <LI> The hybrid exhibits significant enhancement of the activity for both MOR and FAOR. </LI> </UL> </P> <P><B>Graphical abstract</B></P> <P>[DISPLAY OMISSION]</P>
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Do Manh Cuong,김경웅,Tran Quang Toan,Tran Dac Phu 한국자원공학회 2011 Geosystem engineering Vol.14 No.1
Human pharmaceuticals are considered emerging organic micro-pollutants, originating mostly from hospital and municipal wastewater treatment plants. They can be found widely in a variety of water media, including wastewater,surface water, ground water, coastal water and drinking water at trace levels (ng/L or low μg/L). Many pharmaceuticals show their persistence to biodegradation in water, however their bioaccumulation is still not clear and chronic effects to living organisms for long term exposure need further studies. The occurrences and fate of active pharmaceutical compounds and their metabolites in aquatic environments are complicated,which vary between their physio-chemical properties, environment conditions and removal efficiency of water treatment plants. Advanced treatment technologies such as ozonation, advanced oxidation processes (AOPs), membrane bioreactor (MBR)show high efficiency to reduce concentrations of pharmaceutical residues in water.
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( Minh Hai Pham ),( Quan Anh Tuan Le ),( Hoang Bac Nguyen ),( Quang Hung Vu ),( Thai Ngoc Huy Tran ),( Hang Dang Khoa N Guyen ),( Thi Ngoc Sang Duong ),( Van Toan Tran ) 대한간학회 2020 춘·추계 학술대회 (KASL) Vol.2020 No.1
Aims: Laparoscopic pancreaticoduodenectomy (LPD) is considered as a safe and effective procedure in well - selected patients and appropriate surgical technique. Our aim is to evaluate suitability of using protocol for LPD in treatment of periampullary cancer at a single team. Methods: case series Results: Indication for LPD included 37 cases with resectable tumors which were classified basing on NCCN. All witness evaluation risk of complications with PREPARE score, ASA and evaluation risk of postoperative pancreatic fistula (POPF) with FRS classification. There were 2 open conversions because of vein resections, accounting for 5.4%. Standard lymphadenectomy was performed in all of 37 cases. In term of PREPARE score, major complications (Clavien - Dindo >= III) were 17.8%, 0% and 0% (5/28, 0/5 and 0/2 cases) in low risk, intermediate risk and high risk group, respectively. All of cases had ASA I or II. POPF happened 11.1% (1/9), 4.1% (1/24) and 50% (1/2) in low risk, intermediate risk and high risk group, respectively. Frozen section was needed for R0 margin. Retrieved lymph nodes was 8 - 18 with 12 lymph nodes in average. Conclusions: Indication for LPD with resectable tumors is acceptable. ASA I or II is a safe measure to select patient for LPD. FRS classification shows appropriation to evaluate risk of POPF.
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