70 research outputs found
Supplementary material for the article: Nikolic, V.; Loncarevic, B.; Popovic, A. Biodegradation of Copolymer Obtained by Grafting Reaction between Methacrylic Acid and Starch. Polymer Bulletin 2019, 76 (5), 2197ā2213. https://doi.org/10.1007/s00289-018-2484-x
Supplementary material for: [https://doi.org/10.1007/s00289-018-2484-x]Related to published version: [http://cherry.chem.bg.ac.rs/handle/123456789/341
Supplementary material for the article: Nikolic, V.; Loncarevic, B.; Popovic, A. Biodegradation of Copolymer Obtained by Grafting Reaction between Methacrylic Acid and Starch. Polymer Bulletin 2019, 76 (5), 2197ā2213. https://doi.org/10.1007/s00289-018-2484-x
Supplementary material for: [https://doi.org/10.1007/s00289-018-2484-x]Related to published version: [http://cherry.chem.bg.ac.rs/handle/123456789/341
Applying multi-criteria analysis for preliminary assessment of the properties of alginate immobilized Myriophyllum spicatum in lake water samples
The preliminary assessment of the properties of alginate immobilized aquatic weed Myriophyllum spicatum beads-MsAlg in a multi-element system of nine Serbian lakes water samples was done. Herein, the results obtained in the biosorption experiment with MsAlg contents of twenty-two elements analysed by inductively coupled plasma-optical emission spectrometry, biosorption capacity, element removal efficiency, total hardness (TH) and quality index of water (WQI) are presented. Scanning electron microscopy with energy dispersive X-ray spectroscopy was used for the characterization of M. spicatum and its beads. The study showed that aluminium, magnesium and strontium were adsorbed by MsAlg in the water samples from all examined lakes; barium and iron in the water samples from six lakes. The overall average efficiency of MsAlg in biosorption of elements was in the following order: Al > Ba > Sr > Fe > Mg (58.6, 51.7, 48.2, 23.9 and 17.7%, respectively). The increase of TH and WQI values after the biosorption was noticed in all studied lake water samples. The most significant correlations for pH were regarding the contents of B, Mg and Ca, whereas WQI was highly correlated to the contents of B and Mg, and pH. The complexity of the obtained data was explained by Cluster Analysis and Principal Component Analysis, which showed good discrimination capabilities between the water samples taken from different locations. Considering that the invasive M. spicatum is natural, widespread and that its immobilization is cheap and eco-friendly, presented findings could be helpful in further assessment of MsAlg beads for its potential use as biofilter
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), 3881ā3891. 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 material for the article: StankoviÄ, B.; OstojiÄ, B. D.; Gruden, M.; PopoviÄ, A.; ÄorÄeviÄ, D. S. Substituted Naphthalenes: Stability, Conformational Flexibility and Description of Bonding Based on ETS-NOCV Method. Chemical Physics Letters 2016, 661, 136ā142. https://doi.org/10.1016/j.cplett.2016.08.056
Supplementary material for: [https://doi.org/10.1016/j.cplett.2016.08.056]Related to published version: [http://cherry.chem.bg.ac.rs/handle/123456789/2331
Application of Polyphenol-Loaded Nanoparticles in Food Industry
Nanotechnology is an emerging field of science, and nanotechnological concepts have been intensively studied for potential applications in the food industry. Nanoparticles (with dimensions ranging from one to several hundred nanometers) have specific characteristics and better functionality, thanks to their size and other physicochemical properties. Polyphenols are recognized as active compounds that have several putative beneficial properties, including antioxidant, antimicrobial, and anticancer activity. However, the use of polyphenols as functional food ingredients faces numerous challenges, such as their poor stability, solubility, and bioavailability. These difficulties could be solved relatively easily by the application of encapsulation. The objective of this review is to present the most recent accomplishments in the usage of polyphenol-loaded nanoparticles in food science. Nanoparticles loaded with polyphenols and their applications as active ingredients for improving physicochemical and functional properties of food, or as components of active packaging materials, were critically reviewed. Potential adverse effects of polyphenol-loaded nanomaterials are also discussed
The Removal of Ni2+ and Cd2+ -ions onto Synthetic Mineral Based Composite Functionalized by Polyethylenimine
This study presents the synthesis of porous cordierite- based ceramics and its surface activation by polyethylenimine/nano-CeO2 for the heavy metal removal. The synthesis was carried out by the addition of following powders: MgO, Al2O3, and SiO2 in 2:2:5 molar ratios, respectively. The oxide(s) mixture was further processed in two sequential stages: i) ball milled in the ethanol for 40 minutes and palletized under the pressure of 3 t/cm2, as a pre-sintering process, and ii) the pallets were further sintered for 2h in the air atmosphere at 1350 oC, under a heating rate of 20 oC/min. The sintered mineral composite was crashed and sieved, and mixed with 20 wt % of nanocellulose, as a pore forming agent. Nanocellulose mixture was pressed into pallets under 5 t/cm2 and sintered at 700 oC, under a heating rate of 5 oC/ min. The obtained synthetic cordierite was further tested as the adsorbent activated by polyethylenimine/ nano-CeO2 for the removal of Ni2+ and Cd2+ -ions. The adsorption isotherms, kinetics models, and thermodynamic parameters were also analyzed, manifesting that the adsorption is a spontaneous and endothermic process. The phase composition of the pristine and activated cordierite was analyzed by the X-ray diffraction method (XRD), Fourier transformation infrared (FTIR) spectroscopy and scanning electron microscopy (SEM). This work has shed light on the mechanism of heavy metals removal from the aquatic medium using the novel hybrid (nano)synthesized material
Makroporozni kopolimer na bazi glicidilmetakrilata funkcionalizovan sa dietilentriaminom kao sorbent tekstilne boje Reactive Black 5
In this paper, macroporous glycidyl methacrylate and ethylene glycol dimethacrylate copolymer functionalized with diethylene triamine (PGME-deta), was evaluated as Reactive Black 5 (RB5) sorbent. Batch RB5 removal from aqueous solution by PGME-deta was investigated by varying pH, contact time, sorbent dosage, initial dye concentration and temperature. The sorption is pH sensitive having maximum at pH 2 (dye removal of 85%), decreasing with the increase of pH (dye removal of 24% at pH 11) after 60 min. Sorption kinetics was fitted to chemical-reaction and particle-diffusion models (pseudo-first-, pseudo-second-order, intraparticle diffusion and Mckay models). The pseudo-second-order kinetic model accurately predicted the RB5 amount sorbed under all investigated operating conditions, while the intraparticle diffusion was the dominant rate-limiting mechanism. The diffusion mechanism was more prevalent with the decrease in temperature and the increase in concentration. The isotherm data was best fitted with the Langmuir model, indicating homogeneous distribution of active sites on PGME-deta and monolayer sorption, with the maximum sorption capacity of 353 mg g(-1). The calculated sorption rates improved with increasing temperature and an activation energy close to 40 kj mol(-1) was determined, suggesting that chemisorption was also rate-controlling.U okviru ovog rada ispitana je moguÄnost koriÅ”Äenja makroporoznog kopolimera glicidilmetakrilata i etilenglikoldimetakrilata funkcionalizovanog reakcijom otvaranja epoksidnih grupa sa dietilentriaminom (PGME-deta) kao sorbenta reaktivne tekstilne boje Reactive Black 5 (RB5). U Å”aržnim uslovima je ispitano uklanjanje RB5 iz vodenog rastvora pomoÄu PGME-deta, variranjem pH, vremena kontakta, mase sorbenta, poÄetne koncentracije boje i temperature. PGME-deta je pokazao afinitet za sorpciju RB5 zbog prisustva protonovanih amino grupa koje privlaÄe anjonske sulfonatne grupe u molekulu boje i moguÄnosti stvaranja vodoniÄnih veza izmeÄu sorbenta i sorbata. Kinetika sorpcije je analizirana pomoÄu Äetiri kinetiÄka modela (pseudo-prvog, pseudo-drugog reda, unutarÄestiÄne difuzije i Mekej) da bi se odredilo koji model najbolje opisuje sorpciju RB5. Zapažen je izrazit uticaj pH vrednosti na sorpciju RB5, sa maksimumom na pH 2 (pri Äemu je efikasnost uklanjanja boje 85%), i smanjenjem koliÄine sorbovane boje sa poveÄanjem pH (koliÄina uklonjene boje na pH 11 posle 60 min iznosi samo 24%). IzuÄavanjem kinetike sorpcije pokazalo se da sorpcija RB5 pomoÄu PGME-deta sledi kinetiÄki model pseudo-drugog reda (PSO), sugeriÅ”uÄi da je brzina sorpcije kontrolisana kapacitetom sorbenta i koncentracijom sorbata. Mehanizam procesa dominantno Äini unutarÄestiÄna difuzija, uz manji uticaj difuzije kroz film. Ovi mehanizmi difuzije su izraženiji pri nižim temperaturama i veÄim koncentracijama. Langmirov model najbolje opisuje ravnotežnu izotermu, ukazujuÄi na homogenu raspodelu aktivnih mesta na povrÅ”ini PGME-deta i monoslojnu sorpciju. Maksimalni sorpcioni kapacitet izraÄunat iz Langmirove izoterme iznosi 353 mg g-1. Zapaženo je da se brzina sorpcije poveÄava sa poveÄanjem temperature. IzraÄunata vrednost aktivacione energije od oko 40 kJ mol-1 potvrÄuje da se radi o procesu koji dominantno kontroliÅ”e hemisorpcija
Supplementary data for the article: Kekez, B.; GojgiÄ-CvijoviÄ, G.; JakovljeviÄ, D.; PavloviÄ, V.; BeÅ”koski, V.; PopoviÄ, A.; VrviÄ, M. M.; NikoliÄ, V. Synthesis and Characterization of a New Type of Levan-Graft-Polystyrene Copolymer. Carbohydrate Polymers 2016, 154, 20ā29. https://doi.org/10.1016/j.carbpol.2016.08.001
Supplementary material for: [https://doi.org/10.1016/j.carbpol.2016.08.001]Related to published version: [http://cherry.chem.bg.ac.rs/handle/123456789/2300
Evaluation of heavy metal removal efficiency from aqueous solutions and industrial wastewater using sunflower seed husk as a biosorbent
U ovom radu koriÅ”Äena je ljuska suncokreta za procenu efikasnosti uklanjanja teÅ”kih metala iz vodenih rastvora. Na samom poÄetku optimizovani su uslovi maksimalne adsorpcije teÅ”kih metala u funkciji pH rastvora i vremena kontakta. Nakon toga, odreÄena je efikasnost uklanjanja Ni iz uzorka otpadne vode koriÅ”Äenjem suncokretove ljuske kao biosorbenta spektroskopijom laserski indukovane plazme (LIBS) i standardnom spektrohemijskom ICP-OES metodom. Rezultati su uporeÄeni, a dobijene vrednosti su u opsegu granica nesigurnosti LIBS metode.In this work, the sunflower husk was used to evaluate the removal efficiency of heavy metals from an aqueous solution. Firstly, the condition for maximum adsorption of heavy metals is optimized as a function of pH and contact time. Š¢hereafter, the removal efficiency of Ni from the industrial wastewater by the usage of the sunflower husk as a biosorbent was evaluated by laser-induced breakdown spectroscopy (LIBS), and by the standard spectrochemical ICP-OES method. The values obtained by these two methods were compared and the results are within the uncertainty of the LIBS method.58th Meeting of the Serbian Chemical Society; June 9-10, 2022, Belgrade, Serbia
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