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Synthesis of neodymium-doped manganese dioxide via electrodeposition for fast catalysis
Marcos A. Cheney,Xiwen Chen,주상우,민봉기 한국공업화학회 2015 Journal of Industrial and Engineering Chemistry Vol.25 No.-
Neodymium (Nd) ions were successfully substituted for manganese in the crystal lattice of electrolytic amorphous nanomanganese dioxide (EAMD) for the first time, by cathodic deposition from a basic aqueous solution of KMnO4 at 22 8C. The synthesized nanomaterials are characterized by XRD, SEM, TEM, HRTEM, and XPS. The Nd-doped EAMD (Nd-EAMD) produced at 5.0 V is amorphous with homogeneous size and morphology with an average particle size of 26.9 nm. The percent Nd substitution is about 0.69 at%. The as-prepared nanomaterials increase the rate of transformation of Rhodamine B (Rh B) in solution and proceed via an oxidative mechanism.
Synthesis, Characterization, and Catalytic Performance of Sb<sub>2</sub>Se<sub>3</sub> Nanorods
Hu, Ning,Cheney, Marcos A.,Hanifehpour, Younes,Joo, Sang Woo,Min, Bong-Ki Hindawi Limited 2017 Journal of nanomaterials Vol.2017 No.-
<P>Antimony selenide has many potential applications in thermoelectric, photovoltaic, and phase-change memory devices. A novel method is described for the rapid and scalable preparation of antimony selenide (Sb2Se3) nanorods in the presence of hydrazine hydrate and/or permanganate at 40°C. Crystalline nanorods are obtained by the addition of hydrazine hydrate in a reaction mixture of antimony acetate and/or chloride and sodium selenite in neutral and basic media, while amorphous nanoparticles are formed by the addition of KMnO4 in a reaction mixture of antimony acetate/chloride and sodium selenite. The powder X-ray diffraction pattern confirms orthorhombic phase crystalline Sb2Se3 for the first and second reactions with lattice parameters a=1.120 nm, b=1.128 nm, and c=0.383 nm and amorphous Sb2Se3 for the third reaction. Scanning electron microscopy (SEM), transmission electron microscopy (TEM), and high-resolution TEM (HRTEM) images show the diameter of nanorods for the first and second reactions to be in the order of 100 nm to 150 nm and about 20 nm particles for the third reaction. EDX and XPS suggest that the nanorods are pure Sb2Se3. The UV-vis analysis indicates a band gap of 4.14 and 4.97 eV for the crystalline and amorphous Sb2Se3, respectively, corresponding to a blue shift. The photocatalytic study shows that the decolorization of Rhodamine in solution by nanoparticles is slightly greater than nanorods.</P>
Dang, Trung-Dung,Cheney, Marcos A.,Qian, Shizhi,Joo, Sang Woo,Min, Bong-Ki American Chemical Society 2013 INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH - Vol.52 No.7
<P>We report for the first time a novel rapid synthesis method for manganese oxide (MO) nanoparticles by a reaction between acidic permanganate and poly(dimethylsiloxane) (PDMS). In contrast to the existing traditional methods for synthesis of MO nanoparticles, the new method has the advantage of shorter reaction time (∼2 h) at room temperature (∼25 °C). The produced MO nanoparticles are characterized with X-ray diffraction (XRD), scanning electron microscopy (SEM), and transmission electron microscopy (TEM, HRTEM). The material produced is semicrystalline silicon-doped MnO<SUB>2</SUB> with homogeneous size and morphology with an average particle size around 300 nm. Other products of the reactions include Cl<SUB>2</SUB>, silicon dioxide sheets on PDMS, and CO<SUB>2</SUB>. A mechanism for this reaction is proposed. The prepared MO was successfully used as a catalyst for the rapid and highly efficient degradation of a water pollutantRhodamine B (RhB).</P><P><A href='http://pubs.acs.org/doi/suppl/10.1021/ie302971g'>ACS Electronic Supporting Info</A></P>
Reactivity of poly(dimethylsiloxane) toward acidic permanganate
Dang, T.D.,Cheney, M.A.,Qian, S.,Joo, S.W.,Min, B.K. Korean Society of Industrial and Engineering Chemi 2013 Journal of industrial and engineering chemistry Vol.19 No.6
Poly(dimethylsiloxane) (PDMS) has been widely used in various microfluidic devices because it is considered to be one of the most inert materials available. A PDMS-based microfluidic system for the synthesis of manganese oxide (MO) nanoparticles is developed and tested. However, synthesis of MO nanoparticles in the PDMS-based microfluidic system is unsuccessful due to an unexpected reaction between acidic permanganate and PDMS. PDMS is pitted and coated with MnO<SUB>2</SUB> and opalized silica, which are confirmed by SEM and EDX. The products of the reaction between PDMS and acidic permanganate are mainly MnO<SUB>2</SUB>, Cl<SUB>2</SUB>, SiO<SUB>2</SUB> and CO<SUB>2</SUB>, respectively. Here we report for the first time the reactivity of PDMS toward acidic permangante resulting in a new process to coat the channel walls with MnO<SUB>2</SUB>.
Impacts of Road Salts on Leaching Behavior of Lead Contaminated Soil
( Jingjing Wu ),( Timothy Cheney ),( Hwidong Kim ) 한국폐기물자원순환학회(구 한국폐기물학회) 2015 한국폐기물자원순환학회 3RINCs초록집 Vol.2015 No.-
Research was conducted to explore the effects of road salts on lead leaching from lead contaminated soil samples that were collected in an old residence area in Erie, PA, USA. The leaching test was conducted using a leaching solution used for the synthetic precipitate leaching procedure (SPLP) mixed with commercial road salts purchased from a local home-improvement stores. In order to evaluate lead leaching from lead contaminated soil in the presence of road salts, various levels of road salts (5%, 10%, 20%, 30% and 40%) were added to the SPLP leaching solution and tested for lead leaching behavior. The results of the leaching test showed that lead leaching was dramatically increased as road salts were added. With 30% of a fixed value of road salt, approximately 50 mg/L of lead was found in the leaching solution of one of the soil samples. This value is 3000 times higher than the Action Level of lead (0.015 mg/L) in the US drinking water standard. The lead leachability was highly dictated by lead mineral species contained in different leadbased paint pigments.
Reactivity of poly(dimethylsiloxane) toward acidic permanganate
Trung-Dung Dang,주상우,Marcos A. Cheney,스즈첸,민봉기 한국공업화학회 2013 Journal of Industrial and Engineering Chemistry Vol.19 No.6
Poly(dimethylsiloxane) (PDMS) has been widely used in various microfluidic devices because it is considered to be one of the most inert materials available. A PDMS-based microfluidic system for the synthesis of manganese oxide (MO) nanoparticles is developed and tested. However, synthesis of MO nanoparticles in the PDMS-based microfluidic system is unsuccessful due to an unexpected reaction between acidic permanganate and PDMS. PDMS is pitted and coated with MnO2 and opalized silica,which are confirmed by SEM and EDX. The products of the reaction between PDMS and acidic permanganate are mainly MnO2, Cl2, SiO2 and CO2, respectively. Here we report for the first time the reactivity of PDMS toward acidic permangante resulting in a new process to coat the channel walls with MnO2.