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- 저자 : Muruganantham RETHINASABAPATHY (검색결과 40 건)
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Muruganantham Rethinasabapathy,강성민,Yuvaraj Haldorai,Narendranath Jonna,Manokaran Jankiraman,이고운,장성찬,Balasubramanian Natesan,노창현,허윤석 한국공업화학회 2019 Journal of Industrial and Engineering Chemistry Vol.69 No.-
N-doped graphene supported quaternary electrocatalyst (PtRuFeCo/NG) was synthesized and evaluated for potential oxygen reduction (ORR) and methanol oxidation reaction (MOR) in fuel cells. The catalyst exhibited excellent MOR (strong CO tolerance, lower onset potential), ORR (four electron transfer) activities and delivered maximum power densities of 778 and 122 mW cm−2 with direct methanol and proton exchange membrane fuel cells, respectively. The N-doping and synergistic effects of alloying low-cost Fe and Co with Pt and Ru makes PtRuFeCo/NG as excellent bifunctional catalyst that greatly reduces the processing cost of fuel cell which is the major problem facing the fuel cell industry.
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Three-dimensional porous graphene materials for environmental applications
Muruganantham Rethinasabapathy,Sung-Min Kang,Sung-Chan Jang,Yun Suk Huh 한국탄소학회 2017 Carbon Letters Vol.22 No.-
Porous materials play a vital role in science and technology. The ability to control their pore structures at the atomic, molecular, and nanometer scales enable interactions with atoms, ions and molecules to occur throughout the bulk of the material, for practical applications. Three-dimensional (3D) porous carbon-based materials (e.g., graphene aerogels/hydrogels, sponges and foams) made of graphene or graphene oxide-based networks have attracted considerable attention because they offer low density, high porosity, large surface area, excellent electrical conductivity and stable mechanical properties. Water pollution and associated environmental issues have become a hot topic in recent years. Rapid industrialization has led to a massive increase in the amount of wastewater that industries discharge into the environment. Water pollution is caused by oil spills, heavy metals, dyes, and organic compounds released by industry, as well as via unpredictable accidents. In addition, water pollution is also caused by radionuclides released by nuclear disasters or leakage. This review presents an overview of the state-of-the-art synthesis methodologies of 3D porous graphene materials and highlights their synthesis for environmental applications. The various synthetic methods used to prepare these 3D materials are discussed, particularly template-free self-assembly methods, and template-directed methods. Some key results are summarized, where 3D graphene materials have been used for the adsorption of dyes, heavy metals, and radioactive materials from polluted environments.
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Rethinasabapathy, Muruganantham,Kang, Sung-Min,Lee, Ilsong,Lee, Go-Woon,Lee, Sunmook,Roh, Changhyun,Huh, Yun Suk Elsevier 2019 Materials letters Vol.241 No.-
<P><B>Abstract</B></P> <P>In this work, a Prussian blue (PB)/graphene oxide (GO)/chitosan (CS) organic-inorganic composite was successfully synthesized and utilized as an adsorbent for the selective removal of cesium (Cs<SUP>+</SUP>) ions. Taking the advantage of synergistic effect GO, CS and PB nanoparticles, the PB/GO/CS composite exhibited maximum adsorption capacity of 48.35 mg g<SUP>−1</SUP> for Cs<SUP>+</SUP> ions. In the presence of competitive monovalent cations (K<SUP>+</SUP> and Na<SUP>+</SUP>), PB/GO/CS showed excellent selectivity (86%) for Cs<SUP>+</SUP> ions and had a 6-fold higher distribution coefficient (<I>K</I> <SUB>d</SUB>) than GO/CS. This enhanced adsorption capacity with high selectivity of PB/GO/CS for Cs<SUP>+</SUP> ions may have been attributed to (i) the presence of carboxylic, hydroxyl and amino functional groups on GO/CS matrix which strongly bind Cs<SUP>+</SUP> ions through electrostatic attraction and chelation, and (ii) the trapping of Cs<SUP>+</SUP> ions by the voids of the FCC-structured PB lattice whose size is equivalent to the hydration radius of Cs<SUP>+</SUP> ions. Due to its low-cost, facile preparation, high adsorption capacity, and superior Cs<SUP>+</SUP> ions selectivity, PB/GO/CS is a promising material for the selective removal of the Cs<SUP>+</SUP> ions from the environment and for protecting ecosystems from the radiation hazards.</P> <P><B>Highlights</B></P> <P> <UL> <LI> Low-cost organic-inorganic hybrid adsorbent for the selective removal of radioactive Cs. </LI> <LI> Exhibit high cesium (Cs) adsorption capacity of 48.35 mg g<SUP>−1</SUP>. </LI> <LI> Confer high structural stability due to strong electrostatic interaction between GO and CS. </LI> <LI> Excellent selectivity for Cs as the hydration radius of Cs matches with the void size of the PB lattice. </LI> <LI> Easy recovery of PB after Cs adsorption by immobilizing it with GO/CS matrix. </LI> </UL> </P> <P><B>Graphical abstract</B></P> <P>[DISPLAY OMISSION]</P>
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( Muruganantham Rethinasabapathy ),강성민,곽철환,허윤석 한국공업화학회 2018 한국공업화학회 연구논문 초록집 Vol.2018 No.0
Prussian blue (PB)/Chitosan (CS)/Graphene oxide (GO) has been syn-thesized and utilized as a potential adsorbent for the removal of cesium ions (Cs<sup>+</sup>) from aqueous solution. The effects of adsorbate concen-tration, reaction pH, and time on the removal efficiency of Cs<sup>+</sup> were investigated. The optimal pH and reaction time for the removal of Cs<sup>+</sup> were pH 7 and 24 h, respectively, with an adsorbent dosage of 20 mg. The adsorption isotherm is better fitted to the Freundlich model than the Langmuir model with a maximum Cs<sup>+</sup> adsorption capacity of 33 mg g-1. In addition, the kinetic study showed that the adsorption behavior followed a pseudo-second-order kinetics. The adsorbent showed good selectivity towards Cs<sup>+</sup> even in the presence of competitive cations. Therefore, it is expected that this composite can be used for the removal of radioactive cesium.
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Rethinasabapathy, Muruganantham,Kang, Sung-Min,Haldorai, Yuvaraj,Jonna, Narendranath,Jankiraman, Manokaran,Lee, Go-Woon,Jang, Sung-Chan,Natesan, Balasubramanian,Roh, Changhyun,Huh, Yun Suk Elsevier 2019 Journal of industrial and engineering chemistry Vol.69 No.-
<P><B>Abstract</B></P> <P>N-doped graphene supported quaternary electrocatalyst (PtRuFeCo/NG) was synthesized and evaluated for potential oxygen reduction (ORR) and methanol oxidation reaction (MOR) in fuel cells. The catalyst exhibited excellent MOR (strong CO tolerance, lower onset potential), ORR (four electron transfer) activities and delivered maximum power densities of 778 and 122mWcm<SUP>−2</SUP> with direct methanol and proton exchange membrane fuel cells, respectively. The N-doping and synergistic effects of alloying low-cost Fe and Co with Pt and Ru makes PtRuFeCo/NG as excellent bifunctional catalyst that greatly reduces the processing cost of fuel cell which is the major problem facing the fuel cell industry.</P> <P><B>Highlights</B></P> <P> <UL> <LI> First time, a quaternary catalyst is tested as bifunctional catalyst using NG as support. </LI> <LI> Exhibit higher ECSA (91m<SUP>2</SUP> g<SUP>−1</SUP>) and strong tolerance towards CO poisoning. </LI> <LI> Two to three-fold increase in MOR activity than other multi-metallic catalysts. </LI> <LI> Facilitate 4 electron transfer with high current in ORR (6.3mAcm<SUP>−2</SUP>). </LI> <LI> Greatly reduce the cost of the catalyst due to less Pt usage and addition of Fe and Co. </LI> </UL> </P> <P><B>Graphical abstract</B></P> <P>[DISPLAY OMISSION]</P>
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