Application of Ni(II)-alumina Composites for Electrocatalytic Reduction of 4-nitrophenol

Nickel-alumina composites with various content of nickel were synthetized by sol-gel method. The characterization of samples was performed by diffuse reflectance spectroscopy and electrochemical impedance spectroscopy using the Mott-Schottky analysis. Glassy carbon electrode modified by synthesized composites was investigated for reduction of 4-nitrophenol. Modification of glassy carbon electrode with composite sample led to the strong apparent electrocatalysis. Principal component analysis was used to establish correlation between structural, textural and electrochemical data of investigated composites

Characterization of hydrothermaly synthesized zirconia nanopowders

In this paper,a hydrothermal method for synthesis of zirconia nanopowders: pure and with incorporated Si4+ions is presented. Zirconyl chloride and tetraethyl orthosilicate were used as precursors. As prepared powders were annealed at 600 °C and their structural (XRD), morphological (TEM) and textural (BET method) properties were obtained.It has been shown that by using hydrothermal synthesis method pure monoclinic ZrO2highly crystalline powder can be obtainedwithcrystallites of about 25nm. Incorporation of Si4+ions induced stabilization of tetragonal crystalline phase at room temperature, decreasing particle sizes to about 3-6 nm and increasing specific surface area of nanopowders.Physical chemistry 2016 : 13th international conference on fundamental and applied aspects of physical chemistry; Belgrade (Serbia); 26-30 September 201

Surface modification of zirconia nanoparticles with selected enediol ligands

The colloidal ZrO2 nanoparticles were hydrolytically synthesized and characterized using x-ray diffraction and UV/Vis spectroscopy. The surface modification of nanocrystalline particles with selected enediol ligands: catechol (CAT), 2,3-dihydroxynaphthalene (2,3-DHN), anthrarobin (ANT) and quercetin, was found to alter the optical properties of nanoparticles. The formation of the inner-sphere charge-transfer (CT) complexes results in a red shift of the semiconductor absorption onset compared to unmodified nanocrystallites, and a decrease of effective band gap upon increase of the electron delocalization after the inclusion of additional ring

Elektrohemijska oksidacija 2,4,6-trihlorfenola na nano-cirkonijum - oksidnoj matrici dopiranoj gvožđem

Solvothermaly synthesized zirconium oxide nanopowders, pure and doped with various amounts of iron ions (1–20 %), were used as modifiers of glassy carbon electrodes. The modified electrodes were tested in the reaction of electrochemical oxidation of 2,4,6-trichlorophenol (TCP) in order to inves tigate the influence of doping on electrochemical performance of zirconia mat rix. The techniques of cyclic voltammetry and electrochemical impedance spectroscopy were employed. Cyclic voltammetry showed that electrooxid ation of TCP proceeded through the oxidation of hydroxyl group. Possible pathway included the formation of quinones and the formation of polyphenol film on the electrode surface, leading to the electrode fouling. Iron doping enhanced the activity of zirconia matrix towards TCP electrooxidation. Elec trochemical impedance spectroscopy showed the importance of iron content in zirconia matrix for the preferable pathway of TCP electrooxidation. The quin one formation pathway was favoured by low iron doped zirconia (doped with 1% of iron), while polyphenol film formation on the electrode surface was more pronounced at samples with higher iron ion content (for doping with 10 and 20 % of iron). The sample with 5 % of added iron ions, showed intermedНанопрахови цирконијум-оксида, чисти и допирани различитим количинама јона гвожђа синтетисани су солвотермалном методом. Добијени прахови су коришћени као модификатори електродa од стакластог угљеника. Модификоване електроде су тести- ране у реакцији електрохемијске оксидације 2,4,6-трихлорфенола (TCP), како би се испитао утицај допанта на перформансе цирконијум-оксидне матрице. За испитивање су коришћене технике цикличне волтаметрије и електрохемијске импедансне спектро- скопије. Резултати цикличне волтаметрије су показали да се електрооксидација TCP одиграва преко оксидације хидроксилне групе. Могуће даље реакционе путање су укљу- чивале формирање хинона и настајање полифенолног филма на површини електроде који доводи до пасивације електроде. Допирање јонима гвожђа је повећало активност цирконијум-оксидне матрице за електрооксидацију TCP. Резултати електрохемијске импедансне спектроскопије су указали на утицај количине јона гвожђа у цирконијум- -оксидној матрици на реакциони механизам TCP електроосидације. Реакциона путања која укључује формирање хинона је фаворизована на цирконијум-оксидним електро- дама са ниским садржајем јона гвожђа (допираног са 1 % јона гвожђа), док је форми- рање полифенолног филма дошло до изражаја на узорцима са већим садржајем јона гвожђа (допираних са 10 и 20 % јона гвожђа). Узорак цирконијум-оксида, допиран са 5 % јона гвожђа, има прелазна својства, јер долази до формирања полифенолног филма на површини електроде, али и до његове разградње

Synthesis of CdIn2S4 mesocrystals

Ternary nanosized sulfide CdIn2S4was synthesized using hot-injectionmethod in oleic acid/oleylamine mixture as reaction media at 270ºC. TEM images have shown that obtained material grows through multistep process, forming marigold structures built out from mesocrystals. Influence of oleic acid and oleic acid/oleylaminemixture as reaction media on mesocrystal formation is tracked and discussed.Physical chemistry 2016 : 13th international conference on fundamental and applied aspects of physical chemistry; Belgrade (Serbia); 26-30 September 201

Colloidal-chemistry based synthesis of quantized CuInS2/Se2 nanoparticles

Ternary chalcogenide nanoparticles, CuInS2 and CuInSe2, were synthesized in high- temperature boiling organic non-polar solvent. The X-ray diffraction analysis revealed that both materials have tetragonal (chalcopyrite) crystal structure. Morphology of the obtained materials was revealed by using transmission electron microscopy. Agglomerated spherical CuInS2 nanoparticles with broad size distribution in the range from 2 to 20 nm were obtained. In the case of CuInSe2, isolated particles with spherical or prismatic shape in the size range from 10 to 25 nm were obtained, as well as agglomerates consisting of much smaller particles with diameter of about 2-5 nm. The particles with the smallest diameters of both materials exhibit quantum size effect

Supplementary data for the article: Savić, T. D.; Ćomor, M. I.; Abazović, N. D.; Šaponjić, Z. V.; Marinović-Cincović, M. T.; Veljković, D. Ž.; Zarić, S. D.; Janković, I. A. Anatase Nanoparticles Surface Modified with Fused Ring Salicylate-Type Ligands (1-Hydroxy-2-Naphthoic Acids): A Combined DFT and Experimental Study. Journal of Alloys and Compounds 2015, 630, 226–235. https://doi.org/10.1016/j.jallcom.2015.01.041

Supplementary material for: [https://doi.org/10.1016/j.jallcom.2015.01.041]Related to published version: [http://cherry.chem.bg.ac.rs/handle/123456789/1661

Ag-pva/cmc blend hydrogel nanocomposite synthesized by γ-irradiation followed by freeze/thawing method

Poly(vinyl alcohol)/carboxymethyl-chitosan (PVA/CMC) blend hydrogels were synthesized by γ-radiolysis followed by freeze/thawing (FT). Previous, the water-solubility of chitosan (CS) was obtained by γ-radiolytic acidic degradation. CMC molecular weight characterization was performed by a Zetasizer. The fluorescence measurements confirmed the presence of CMC in the PVA/CMC blend hydrogels. In situ preparation of Ag nanoparticles (AgNPs) in PVA/CMC blend hydrogel matrices has been performed exposing hydrogels, swollen in AgNO3 solution, to γ-irradiation. The mathematical models applied for determination swelling kinetics showed that the initial concentrations of CMC and AgNPs directly have influence on the swelling parameters of Ag-PVA/CMC nanocomposites. Diffusion characteristics, determined by different diffusion models (Early Time (ET), Late Time (LT) and Etters (E)) are less due to the presence of AgNPs

Supplementary data for the article: Savić, T. D.; Ćomor, M. I.; Abazović, N. D.; Šaponjić, Z. V.; Marinović-Cincović, M. T.; Veljković, D. Ž.; Zarić, S. D.; Janković, I. A. Anatase Nanoparticles Surface Modified with Fused Ring Salicylate-Type Ligands (1-Hydroxy-2-Naphthoic Acids): A Combined DFT and Experimental Study. Journal of Alloys and Compounds 2015, 630, 226–235. https://doi.org/10.1016/j.jallcom.2015.01.041

Supplementary material for: [https://doi.org/10.1016/j.jallcom.2015.01.041]Related to published version: [http://cherry.chem.bg.ac.rs/handle/123456789/1661

Zirconia based photocatalysts in degradation of selected herbicides

Hydrothermally synthesized zirconia nanopowders: pure and doped with Si4+ ions were spectroscopically characterized and used as photocatalysts for degradation of herbicides sulcotrione and fluroxypyr. Zirconia is wide band gap ceramic (Eg ~ 5 eV) however, synthesized nanopowders showed unexpected, modest absorbance in visible light range. That fact inspired photocatalytical degradation of herbicides with wide utilization, using solar irradiation (SI) in laboratory conditions. In the scope of this study, degradation of herbicides was only slightly achieved (irradiation time 2h).XV International Conference on Fundamental and Applied Aspects of Physical Chemistry : Proceedings. Vol. 1, September 20-24,2021, Belgrad