02759nas a2200253   4500008004100000022001400041245009800055210006900153260009200222300001200314490000700326520187800333653001202211653000802223653000902231653001902240653000902259100002502268700002302293700002002316700002002336700002002356856012902376       2012                        eng d  a1533-488000aPhotocatalytic degradation of Azo dyes using Au:TiO2, gamma-Fe2O3:TiO2 functional nanosystems0 aPhotocatalytic degradation of Azo dyes using AuTiO2 gammaFe2O3Ti  a26650 THE OLD RD, STE 208, VALENCIA, CA 91381-0751 USAbAMER SCIENTIFIC PUBLISHERScFEB  a928-9360 v123 a<p>We report photocatalytic degradation studies on Navy Blue HE2R (NB) dye on significant details as a representative from the class of azo dyes using functional nanosystems specifically designed to allow a strong photocatalytic activity. A modified sol-gel route was employed to synthesize Au and gamma-Fe2O3 modified TiO2 nanoparticles (NPs) at low temperature. The attachment strategy is better because it allows clear surface of TiO2 to remain open for photo-catalysis. X-ray diffraction, Raman and UV-VIS spectroscopy studies showed the presence of gold and iron oxide phases along-with the anatase TiO2 phase. TEM studies showed TiO2 nanocomposite particles of size similar to 10-12 nm. A detailed investigation on heterogeneous photocatalytic performance for Navy Blue HE2R dye was done using the as-synthesized catalysts Au:TiO2 and gamma-Fe2O3:TiO2 in aqueous suspension under 8 W low-pressure mercury vapour lamp irradiation. Also, the photocatalytic degradation of Amranth and Orange G azo dyes were studied. The surface modified TiO2 NPs showed significantly improved photocatalytic activity as compared to pure TiO2. Exposure of the dye to the UV light in the presence of pure and gold NPs attached TiO2 catalysts caused dye degradation of about similar to 20% and similar to 80%, respectively, in the first couple of hours. In the presence of gamma-Fe2O3 NPs attached TiO2, a remarkable similar to 95% degradation of the azo dye was observed only in the first 15 min of UV exposure. The process parameters for the optimum catalytic activity are established which lead to a complete decoloration and substantial dye degradation, supported by the values of the Chemical Oxygen Demand (COD) similar to 93% and Total Organic Carbon (TOC) similar to 65% of the treated dye solution after 5 hours on the employment of the UV/Au:TiO2/H2O2 photocatalytic process.</p>10aAzo Dye10aCOD10aH2O210aPhotocatalysis10aTiO21 aJagadale, Tushar, C.1 aKulkarni, Manjusha1 aPravarthana, D.1 aRamadan, Wegdan1 aThakur, Pragati  uhttps://library.ncl.res.in/content/photocatalytic-degradation-azo-dyes-using-autio2-gamma-fe2o3tio2-functional-nanosystems-002168nas a2200205   4500008004100000022001400041245012100055210006900176260007100245300001600316490000800332520136900340100001701709700001601726700002001742700002201762700002901784700001801813856013101831       2014                        eng d  a1932-744700aOff-stoichiometric nickel cobaltite nanoparticles: thermal stability, magnetization, and neutron diffraction studies0 aOffstoichiometric nickel cobaltite nanoparticles thermal stabili  a1155 16TH ST, NW, WASHINGTON, DC 20036 USAbAMER CHEMICAL SOCcJUL  a16246-162540 v1183 a<p>In the present investigation, we report a detailed examination of the effect of off-stoichiometry introduced in NiCo2O4 by adding excess cobalt. Thus, we compare and analyze the structural and magnetic properties of the Ni075Co2.25O4 and NiCo2O4 cubic systems. A low temperature combustion method was utilized to synthesize stoichiometric (NiCo2O4) and off-stoichiometric (Ni0.75Co2.25O4) nanoparticles on a large scale. The X-ray diffraction pattern for the sample annealed at high temperature (773 K) shows the presence of a much less intense NiO phase (similar to 2-5%) in Ni0.75Co2.25O4 as compared to that in the case of NiCo2O4 sample (similar to 15-20%). The Ni 2p and Co 2p XPS spectra reveal the coexistence of Ni2+, Ni3+, Co2+, and Co3+ species on the surface of both the NiCo2O4 and Ni0.75Co2.23O4 samples in differing proportions. In addition to the basic magnetic characterizations using PPMS, these were also analyzed by neutron diffraction. The off-stoichiometric Ni0.75Co2.25O4 sample shows an interesting magnetic phase conversion from frustrated dipolar system to an enhanced magnetic ordering upon annealing. Local moments on the lattice sites of NiCo2O4 and Ni0.75Co2.25O4 samples are further compared by neutron diffraction confirming stronger ordered moments and enhanced structural and thermal stability for the Ni0.75Co2.25O4 sample.</p>1 aVerma, Seema1 aKumar, Amit1 aPravarthana, D.1 aDeshpande, Aparna1 aOgale, Satishchandra, B.1 aYusuf, S., M.  uhttps://library.ncl.res.in/content/stoichiometric-nickel-cobaltite-nanoparticles-thermal-stability-magnetization-and-neutron-0