Supplementary data for article : Panic, V. V.; Seslija, S. I.; Popovic, I. G.; Spasojevic, V. D.; Popovic, A. R.; Nikolic, V. B.; Spasojevic, P. M. Simple One-Pot Synthesis of Fully Biobased Unsaturated Polyester Resins Based on Itaconic Acid. Biomacromolecules 2017, 18 (12), 3881–3891. https://doi.org/10.1021/acs.biomac.7b00840

Supporting information for: [https://doi.org/10.1021/acs.biomac.7b00840]Related to published version: [http://cherry.chem.bg.ac.rs/handle/123456789/2568]Related to accepted version: [http://cherry.chem.bg.ac.rs/handle/123456789/3058

Supplementary data for article : Panic, V. V.; Seslija, S. I.; Popovic, I. G.; Spasojevic, V. D.; Popovic, A. R.; Nikolic, V. B.; Spasojevic, P. M. Simple One-Pot Synthesis of Fully Biobased Unsaturated Polyester Resins Based on Itaconic Acid. Biomacromolecules 2017, 18 (12), 3881–3891. https://doi.org/10.1021/acs.biomac.7b00840

Supporting information for: [https://doi.org/10.1021/acs.biomac.7b00840]Related to published version: [http://cherry.chem.bg.ac.rs/handle/123456789/2568]Related to accepted version: [http://cherry.chem.bg.ac.rs/handle/123456789/3058

A novel carbon paste electrode based on nitrogen-doped hydrothermal carbon for electrochemical determination of carbendazim

In this work, a new carbon paste electrode, prepared from nitrogen-doped hydrothermal carbon (CHTCN) was applied for the electrochemical detection and determination of carbendazim fungicide. CHTCN samples with the nominal nitrogen content 0.05-0.5 wt. % in glucose precursor were prepared by simple, low-cost synthesis with the accompanying carbonization to 1273 K. The presence of nitrogen in CHTCN samples was confirmed by elemental analysis. Characterization of CHTCN as material for carbon paste electrode was achieved by cyclic voltammetry measurement of the Fe(CN)(6)(3-/4-) redox couple. The results showed that best electrochemical response was obtained from the sample with a nominal nitrogen concentration of 0.1 wt. % and with tricresyl phosphate as a binder. During the development of a differential pulse stripping voltammetric method for carbendazim determination applying new electrode, the following experimental parameters were studied: the sort and amount of binding liquid, the effect of pH, accumulation potential and accumulation time. Under optimal conditions, the electrode offered linearity in the wide concentration range from 25 to 490 ng cm(-3) and an estimated detection limit of 1.21 ng cm(-3). Moreover, the electrode showed good stability, high selectivity and satisfactory anti-interference ability. Finally, the developed method was successfully applied for the determination of carbendazim traces in spiked tap and river water samples

Pregled tehnoloških postupaka i eksperimentalno određivanje termodinamičkih i transportnih svojstava reagensa za uklanjanje ugljen-dioksida

In this work a review of the currently available methods for carbon dioxide removal from flue gasses is given. Some of them are commercially available, while others are still under development. Special attention is given to detailed description of the methods based on hemi sorption by aqueous solutions of alkanolamines, which found wide commercial use in industry. Selection of appropriate absorbent, process equipment, methods, working parameters, combustion processes, etc., are some of the key points that will be reviewed within this work in order to present advantages and limitations of carbon dioxide removal methods. In the experimental section we have provided data on density, viscosity and refractive index of insufficiently investigated carbon dioxide removal agents, such as monoisopropanolamine (MIPA), diisopropanolamine (DIPA), triisopropanolamine (TIPA) and currently widely used dietanolamine (DEA). The data obtained are crucial for the equipment design and process optimization.Intezivna naučna istraživanja u proteklih dvadeset godina pružaju jasne dokaze da su klimatske promene, kao i porast koncentracije gasova koji izazivaju efekat staklene bašte u atmosferi, prouzrokovane čovekovim delovanjem. Energetski sektor igra ključnu ulogu u ukupnoj emisiji ugljen-dioksida sa udelom između 60 i 70%, obaveza po pitanju smanjenja emisije gasova staklene bašte. Pored toga, povećanje potrošnje energije iz godine u godinu, kao i očekivano povećanje industrijske proizvodnje, dovešće do povećanja potrošnje fosilnih goriva, a samim tim i do povećanja emisije gasova staklene bašte. Navedene činjenice impliciraju da će energetski sektor biti ključan sektor u kome je potrebno ostvariti implementaciju svih mera i aktivnosti koje kao glavni cilj imaju smanjenje emisije gasova staklene bašte. Ovaj rad daje pregled tehnoloških postupaka za uklanjanje ugljen-dioksida od kojih su neki već našli komercijalnu upotrebu, dok su drugi još uvek u fazi razvoja. Posebna pažnja je posvećena opisu metoda zasnovanih na hemisoprpciji rastvora alkanolamina, koji su našli široku komercijalnu upotrebu. Izbor odgovarajućeg rastvarača, procesne opreme, radnih parametara, procesa sagorevanja itd. su samo neki od ključnih tačaka koje su prikazane u okviru ovog rada sa ciljem pružanja jasnije slike o mogućnostima i ograničenjima metoda za uklanjanje ugljen-dioksida. U okviru eksperimentalnog dela rada dati su rezultati merenja transportnih svojstava, nedovoljno ispitanih jedinjenja monoizopropanolamina (MIPA), diizopropanolamina (DIPA), triizopropanolamina (TIPA) i dietanolamina (DEA) kao potencijalnih reagensa za uklanjanje ugljen-dioksida. Od poseb nog interesa su svojsta gustine, indeksa refrakcije i viskoznosti kao i promena ovih svojstava čistih jedinjenja sa temperaturom. Navedeni parametri su ključni za projektovanje procesne opreme kao i za optimizaciju samog procesa uklanjanja ugljen-dioksida

Simple One-Pot Synthesis of Fully Biobased Unsaturated Polyester Resins Based on Itaconic Acid

For the preparation of fully biobased unsaturated polyester resins (UPRs), the replacement of styrene with alternate nonpetroleum-based monomers turned out to be one of the most challenging tasks. Its complexity lies in the fact that reactive diluents (RD) have to have low viscosity and volatility, good compatibility with prepolymer, and capability to homopolymerize and copolymerize with its unsaturations. In this context, we directed our efforts to develop fully biobased UPRs using the dialkyl itaconates as an alternative to styrene. Therefore, a series of 100% biobased UPRs were prepared from itaconic acid and 1,2-propandiol and diluted by dialkyl itaconates. The resins were characterized by Fourier transform infrared spectroscopy, NMR, volatility, and viscosity measurements, while the cured samples were characterized by dynamic mechanical properties, thermomechanical analysis, thermogravimetric analysis data, and tensile tests. The influence of RD structure on the properties of cured samples was discussed in detail. It was shown that the prepared resins had evaporation rates of dialkyl itaconates of several orders of magnitude less compared to styrene. The cured resins with dimethyl itaconate showed comparable or even better thermal and mechanical properties compared to the one with styrene. This investigation showed that itaconic acid and dialkyl itaconates are promising bioresources for the preparation of fully biobased UPRs for mass consumption

Densities, Refractive Indices, Viscosities, and Spectroscopic Study of 1-Amino-2-propanol+1-Butanol and+2-Butanol Solutions at (288.15 to 333.15) K

Densities, refractive indices, and viscosities of 1-amino-2-propanol (monoisopropanolamine (MIPA)) + 1-butanol and 1-amino-2-propanol + 2-butanol solutions are reported over the entire range of mole fractions and the temperature range from (288.15 to 333.15) K. The Redlich-Kister relation was used for correlation of measured results of excess molar volumes, viscosities, and refractive indices as a function of temperature and composition. Partial molar volumes at infinite dilution were determined from apparent molar volumes. Negative values for excess molar volumes, refractive indices, and viscosity deviations are observed over the entire composition range. The viscosities of 1-amino-2-propanol with 1-butanol and 1-amino-2-propanol with 2-butanol are well represented by an Arrhenius equation. Activation energies for viscous flows are determined by linearization of the Arrhenius equation, providing a clear explanation of the influence on hydrogen bonding. In order to confirm molecular interactions between compounds obtained by analysis of infinite dilution of solute, a FT-IR spectroscopy study was performed at T = 298.15 K. Interactional and structural effects were investigated through calculations of excess Gibbs free energy of activation of viscous flow

Dual responsive antibacterial Ag-poly(N-isopropylacrylamide/itaconic acid) hydrogel nanocomposites synthesized by gamma irradiation

Thermo- and pH-sensitive Ag-P(NiPAAm/IA) hydrogel nanocomposites were prepared by in situ reduction of Ag+ ions with gamma irradiation. P(NiPAAm/IA) copolymer hydrogel matrices have been previously synthesized by radiation induced copolymerization. The copolymer composition was determined by elemental analysis of the dried gels, and was found to be close to that of the feed. The dependence of swelling properties and phase transitions on the IA comonomer content, temperature, pH values and presence of AgNPs were investigated. The hydrogels showed both thermo- and pH responses. By introducing small amounts of IA, swelling capacity increase, and the volume phase transition temperature (VPIT) of P(NiPAAm/IA) copolymers is transferred to higher values. Presence of AgNPs causes decrease of equilibrium swelling degree and VPIT, and allows of fine-tuning of these properties. Both the average values of compressive elastic modulus and Youngs modulus of elasticity were decreased by addition of IA as a consequence of looser structure of the network (increase in molar mass between two neighboring crosslinks and decrease in effective crosslinking density). The introduction of AgNPs promoted not only improvement of these mechanical parameters, but an improvement of stress at failure especially in the systems with the highest content of IA. In addition, Ag-P(NiPAAm/IA) hydrogel nanocomposites showed good antibacterial potentials. (C) 2015 Elsevier Ltd. All rights reserved

Numerical simulation of coal powder fractions distribution in thermal power plant mixture channel

One of the key requirements for implementing plasma system for fire stabilization is to achieve adequate concentration and mass flow of coal particles in the part of the mixture channel where thermo-chemical treatment will take place. The results in the paper present distribution of various coal powder fractions in the mixture channel on thermal power plant ßNikola Tesla"-A1, obtained by numerical simulation. Computation software for numerical simulation is Fortran code developed in Laboratory for Thermal Engineering and Energy. In order to adequately direct coal particles in the mixture channel, the shutter system is positioned in it. It consists of three groups of shutters. Fictitious shutter-obstacle was introduced in computations only, as an alternative solution. The problem was treated as two-dimensional. Input data for numerical computations are velocity profile of gaseous components and concentration profile of coal particles, obtained by the experiments. Distribution of particle fractions was treated uniform. Continual phase (gas) was treated by an Eulerian approach. Disperse phase is modeled by Lagrangian approach. The model takes in consideration coupling of phases by PSICELL method. Turbulence was modeled with standard κ-ε model. The model treats particle as ideal sphere. In order to accurately determine particle movement, all relevant forces are incorporated in the model, forces with continual affect (presence of continual phase and gravity) and forces with the impulse affect (interaction of particles with boundaries-walls and interaction between the particles). The results include velocity profiles and fields of gaseous phase, concentration fields of particles and mass flow distribution of various particle diameters across the channel.ECOS 2008 : June 24-27, Cracow-Gliwice, Poland, 2008

Investigation of indoor and outdoor air quality of the classrooms at a school in Serbia

The air inside schools can be more polluted than the air outside. The purpose of this study was to investigate the air quality in primary school placed in town at the east of Serbia. The characterization of air pollution concentration was performed with main goal to determine relationship between indoor and outdoor air pollution within five classrooms. The measurements were conducted continuously in indoor and outdoor environment for period of 10 days. The standard sampling and analytical methods were applied (gas chromatography coupled with mass spectrometry). This paper presents and analyses concentrations of different physical and chemical pollutants in the indoor and outdoor environment: respirable particulate matter with different diameters (up to 2.5 mu m and 10 mu m), polycyclic aromatic hydrocarbon in particulate matters up to 10 mu m, volatile organic compounds, formaldehyde, ozone, carbon-dioxide and nitric-dioxide. It was found, in one class, that the concentration of particulate matter with diameter up to 10 and 2.5 microns as well as polycyclic aromatic hydrocarbon in particulate matters up to 10 mu m were higher in indoor environment than in outdoor. The average value of formaldehyde in all classrooms was significantly higher than recommended value. On the basis of received results, extensive school renovation program can be recommended. (C) 2014 Elsevier Ltd. All rights reserved

Kolubara mine lignite emission factor evaluation

Prema međunarodno priznatoj metodologiji za procenu emisije gasova staklene bašte (The Revised 1996 IPCC Guidelines for National Greenhouse Gas Inventories - GHG), preporučeno je da se u izradi inventara GHG koriste preciznije vrednosti o karakteristikama korišćenog fosilnog goriva. U ovom radu je prikazana analiza emisionih karakteristika domaćih niskokaloričnih lignita iz površinskih kopova kolubarskog basena. Izbor analiziranih uzoraka uglja izvršen je tako da se pokrije širok opseg sadržaja pepela i vlage, donjeg toplotnog efekta i drugih karakteristika sirovog uglja, sa ciljem da reprezentuju najširi spektar očekivanih kvaliteta ugljeva koji se dopremaju u termoelektrane. Dobijeni rezultati ukazuju da postoji jasno izražena linearna zavisnost donjeg toplotnog efekta od sadržaja pepela i sadržaja vlage, odnosno od sadržaja sagorljivih materija u reprezentativnim uzorcima uglja. U radu je prikazana eksperimentalno određena zavisnost sadržaja ugljenika i emisionog faktora od donjeg toplotnog efekta. U opsegu kvaliteta rovnog lignita, emisioni faktor ima znatno veću vrednost u odnosu na standardnu međunarodno preporučenu (IPCC) fiksnu vrednost za lignit.In accordance with the Revised 1996 IPCC Guidelines for National Greenhouse Gas Inventories, it is recommended that more precise and reliable data characteristics of the locally used fossil fuel should be introduced in GHG inventory preparation. This paper presents the evaluation of emission characteristics of low calorific Kolubara open pit mined lignite. The samples of coal were carefully selected to cover a wide range of net calorific value, ash, and moisture content, in order to ensure the coverage of wide spectra of the expected lignite qualities that are usually supplied to Serbian thermal power plants. Performed correlation analysis indicated that linear correlation between the net calorific value and the ash, moisture, and the content of combustible matter in the coal samples exists. From obtained set of results it was possible to determine the dependence between the carbon content as well as the emission factor and the net calorific value of the coal. For the range of coal with net calorific values taken in the consideration, derived correlation gives considerably higher values for the emission factor, compared to the standard IPCC recommended value for lignite