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Gopiraman, Mayakrishnan,Deng, Dian,Zhang, Ke-Qin,Kai, Wei,Chung, Ill-Min,Karvembu, Ramasamy,Kim, Ick Soo American Chemical Society 2017 INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH - Vol.56 No.8
<P>Human hair powder (HHP) after chemical treatment (e-HHP) has been successfully utilized as a unique catalyst support for immobilization of metal nanoparticles (MNPs). Ag, Au, Cu, Ni, and Ru NPs were used to prepare five different nanocatalysts (MNPs/e-HHP). High-resolution transmission electron microscopy results confirmed the excellent attachment of ultrafine MNPs on the surface of e-HHP. Actual loading of metal in MNPs/e-HHP was determined by energy-dispersive spectroscopy and X-ray photoelectron spectroscopy analyses. The zero-valent state of MNPs in MNPs/e-HHP and a very strong interaction between MNPs and e-HHP were also proven. The obtained AgNPs/e-HHP, AuNPs/e-HHP, CuNPs/e-HHP, NiNPs/e-HHP, and RuNPs/e-HHP catalysts were employed for the self-coupling of amines, <I>N</I>-oxidation of tertiary amines, <I>aza</I>-Michael reaction, imines synthesis, and oxidation of alcohols, respectively. Reaction conditions were optimized, and the scope of the catalytic systems was extended. The merit of the MNPs/e-HHP materials is shown to be the superior catalytic activity. Advantages, shortcomings, and future scope of the MNPs/e-HHP system are also highlighted.</P><P><B>Graphic Abstract</B> <IMG SRC='http://pubs.acs.org/appl/literatum/publisher/achs/journals/content/iecred/2017/iecred.2017.56.issue-8/acs.iecr.6b04209/production/images/medium/ie-2016-042096_0013.gif'></P><P><A href='http://pubs.acs.org/doi/suppl/10.1021/ie6b04209'>ACS Electronic Supporting Info</A></P>
Gopiraman, Mayakrishnan,Deng, Dian,Kim, Byoung-Suhk,Chung, Ill-Min,Kim, Ick Soo Elsevier 2017 APPLIED SURFACE SCIENCE - Vol.409 No.-
<P><B>Abstract</B></P> <P>Highly porous carbon nanoarchitectures (HPCNs) were derived from biomass materials, namely, corn fibers (CF), corn leafs (CL), and corn cobs (CC). We surprisingly found that by a very simple activation process the CF, CL, and CC materials can be transformed into exciting two-dimensional (2D) and three-dimensional (3D) carbon nanoarchitectures with excellent physicochemical properties. FESEM and HRTEM results confirmed a three different carbon forms (such as foams-like carbon, carbon sheets with several holes and cheese-like carbon morphology) of HPCNs. Huge surface area (2394–3475m<SUP>2</SUP>/g) with excellent pore properties of HPCNs was determined by BET analysis. Well condensed graphitic plans of HPCNs were confirmed by XRD, XPS and Raman analyses. As an electrode material, HPCNs demonstrated a maximum specific capacitance (Cs) of 575F/g in 1.0M H<SUB>2</SUB>SO<SUB>4</SUB> with good stability over 20,000 cycles. The CC-700°C showed a tremendous Cs of 375F/g even at 20000th cycles. To the best of our knowledge, this is the highest Cs by the biomass derived activated carbons in aqueous electrolytes. The CC-700°C exhibited excellent charge-discharge behavior at various current densities (0.5–10Ag<SUP>−1</SUP>). Notably, CC-700°C demonstrated an excellent Cs of 207F/g at current density of 10Ag<SUP>−1</SUP>. An extraordinary change–discharge behavior was noticed at low current density of 0.5Ag<SUP>−1</SUP>.</P> <P><B>Highlights</B></P> <P> <UL> <LI> Highly porous carbon nanoarchitectures (HPCNs) were derived from corn materials. </LI> <LI> Huge surface area and excellent pore properties of HPCNs were confirmed. </LI> <LI> HPCNs exhibited a maximum specific capacitance (Cs) of 575F/g in 1.0M H<SUB>2</SUB>SO<SUB>4</SUB>. </LI> <LI> CC-700°C maintained a tremendous Cs of 375F/g even at 20000th cycles. </LI> <LI> HPCNs depicted excellent charge-discharge behavior at various current densities. </LI> </UL> </P> <P><B>Graphical abstract</B></P> <P>[DISPLAY OMISSION]</P>
Guohao Yuan,MAYAKRISHNAN GOPIRAMAN,차형준,황동수,정일민,김익수 한국공업화학회 2017 Journal of Industrial and Engineering Chemistry Vol.46 No.-
Interconnected ruthenium dioxide nanoparticles (RuO2NPs) anchored graphite oxide nanocatalyst(RuO2/GO) with good BET surface-area (285 m2/g) was prepared. Under feasible reaction conditions, theRuO2/GO worked well for oxidative synthesis of imines. The RuO2/GO catalyzed a broad range of aminesincluding less reactive aliphatic amines in good yields (98–58%) with excellent selectivity (100%). This isthe most efficient RuO2-based nanocatalyst for the synthesis of imines among those reported to date. Anindirect two-step method was adopted for the coupling of alcohols and amines, and the results found tobe excellent. The reusability, stability and heterogeneity of RuO2/GO were also investigated.
Somasundaram Saravanamoorthy,정일민,Vanaraj Ramkumar,Baskar Ramaganthan,MAYAKRISHNAN GOPIRAMAN 한국공업화학회 2018 Journal of Industrial and Engineering Chemistry Vol.60 No.-
Highly efficient and cost-effective NiO-based carbon nanocomposite (NiO/CNP) was prepared for the transfer hydrogenation of aromatic aldehydes and reduction of nitrophenols. Uniform dispersion of NiO nanoparticles, surface area of NiO/CNP (67 m2 g−1), chemical state and content of Ni in NiO/CNP (+2, 5.1 wt%) were confirmed. High rate constant (kapp) values of 4.2 × 10−2 s−1 and 3.06 × 10−2 s−1 were calculated for the NiO/CNP–catalyzed reduction of nitrophenols. The NiO/CNP demonstrated an excellent catalytic activity towards the transfer hydrogenation reactions under very mild reaction conditions. Chemoselectivity, heterogeneity, stability, reusability and scale reaction of the NiO/CNP system were tested.