02238nas a2200241   4500008004100000022001400041245010700055210006900162260007300231300001200304490000700316520138200323653001201705653001601717653000901733653001801742653001101760100002101771700002401792700002901816700002601845856012501871       2008                        eng d  a0926-337300aIron-nickel bimetallic nanoparticles for reductive degradation of azo dye orange G in aqueous solution0 aIronnickel bimetallic nanoparticles for reductive degradation of  aPO BOX 211, 1000 AE AMSTERDAM, NETHERLANDSbELSEVIER SCIENCE BVcMAR  a270-2780 v793 a<p>The degradation of Orange G, a monoazo dye, in aqueous solutions was investigated using Fe-Ni bimetallic nanoparticles. Transmission electron microscopy (TEM) of as-synthesized nanoparticles showed the presence of spherical particles having a size of 20-40 nm. X-ray photoelectron spectroscopy (XPS) did not detect the presence of nickel on the nanoparticle surface, which suggested a uniform distribution of both metals inside the particle core. Batch experiments with a minimum nanocatalyst loading of 3 g/L showed complete dye degradation after 10 min of reaction time. The degradation efficiency was linearly dependent on the initial dye concentration, pH of the solution and total Fe-Ni catalyst concentration. The efficiency increased with increasing Fe-Ni concentration and decreasing pH of the solution, but decreased with an increase in the dye concentration. The degradation rate followed first order reaction kinetics with respect to the dye concentration. High performance liquid chromatography-mass spectrometry (HPLC-MS) analysis of the degradation products revealed that the degradation mechanism proceeds through a reductive cleavage of the azo linkage resulting in the formation of aniline and surface-adsorbed naphthol amine derivatives. The latter are subsequently hydroxylated through an oxidative process. (C) 2007 Elsevier B.V. All rights reserved.</p>10aAzo Dye10aDegradation10airon10aNanoparticles10aNickel1 aBokare, Alok, D.1 aChikate, Rajeev, C.1 aRode, Chandrashekhar, V.1 aPaknikar, Kishore, M.  uhttps://library.ncl.res.in/content/iron-nickel-bimetallic-nanoparticles-reductive-degradation-azo-dye-orange-g-aqueous-0