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Nature-derived corrosion inhibition of carbon steel in HCl by black pine essential oil and its active compounds
No full textThis study investigates the potential of black pine essential oil and its phytochemicals as eco-friendly corrosion inhibitors for carbon steel in a 1 M HCl solution. The chemical composition of the oil was analyzed using GC/MS and FTIR, revealing the presence of active phytochemicals, including α-pinene, β-pinene, and caryophyllene. To compare the efficiency of the essential oil and its phytochemicals, impedance and polarization methods were employed. All tested inhibitors exhibited mixed-type inhibition, with predominant cathodic control. The inhibition efficiency of all compounds increased with time. After 4 hours, the efficiency of the inhibitors at the same concentration of 80 ppm increased in the following order: β-pinene < α-pinene < black pine essential oil < caryophyllene. Additionally, the active compounds were tested at concentrations similar to their natural occurrence in 100 ppm of essential oil. α-pinene demonstrated the highest efficiency compared to β-pinene and caryophyllene, though it was slightly less effective than 100 ppm of the essential oil. Surface morphology analysis using SEM revealed significant changes in the steel surface, further supporting the corrosion inhibition properties of the oil. XPS analysis confirmed the formation of a protective film composed of Fe oxides/hydroxides and phytochemicals. These results highlight the potential of black pine essential oil as a sustainable, green corrosion inhibitor, contributing to the growing shift toward environmentally friendly industrial practices
Hydrogen evolution on Ir nanoparticles supported by glassy carbon and graphene nanoplatelets
No full textThis study reports on the electrocatalytic activity of Ir nanoparticles (NPs) supported by glassy carbon (GC) and graphene nanoplatelets (GNPs) for the hydrogen evolution reaction (HER) in an acid solution. Ir/GC and Ir/GNPs catalysts were obtained by the electrochemical deposition of Ir on the two supports under the same conditions. SEM imaging revealed small, barely visible, Ir NPs highly dispersed on GC and located mainly on the edges of graphene plates on GNPs support. According to XPS analysis, the amount of the deposited Ir was 1.3 at% (15.9 wt%) in Ir/GC and 1.4 at% (16.5 wt%) in Ir/GNPs. Ir/GNPs catalyst has shown a higher HER activity, and potential for 10 mA/cm2 of −0.064 V, compared to −0.073 V for Ir/GC. The 32 mV/dec Tafel slope for Ir/GC and 38 mV/dec for Ir/GNPs indicate the Volmer-Tafel and Volmer-Heyrovski reaction pathways, respectively
Nonlinear frequency response analysis of a forced periodically operated non-isothermal CSTR used for methanol synthesis – Simultaneous modulations of two inputs
No full text• The analysed reactor system could be intensified by
using optimised Forced Periodic Operation (FPO).
• Nonlinear Frequency Response (NFR) method was
used for the evaluation of possible improvements.
• Simultaneous modulation of CO inlet fraction and volumetric flow rate resulted in an up to 30.4% increase of outlet molar flow rate of methanol
Map: Pečena slatina (VODA 2025)
No full textUzorci su uzeti iz jezera Pečena slatina. Fitoplankton i makrofiti su identifikovani korišćenjem metabarkodiranja.Samples were taken from Lake Pečena Slatina. Phytoplankton and macrophytes were identified using metabarcoding.Coordinate system: WGS84/UTM 34N; Resolution: 300 DPI; Data format: JPEGUsed QGIS software.Mapa je objavljena u Zborniku radova 54. konferencije o aktuelnim temama korišćenja i zaštite voda - VODA 2025: [https://cer.ihtm.bg.ac.rs/handle/123456789/8462
Supporting information for: A Neutral All-Aluminum Aromatic
No full textAromaticity is a fundamental concept in organic chemistry, underpinning the electronic structure, stability, and reactivity of planar, cyclic, and conjugated systems typically composed of carbon with or without heteroatoms (e.g., nitrogen, oxygen, sulfur). While metal-containing aromatic systems have recently emerged, all-metal aromatics remain rare. Here, we report a neutral 2π aromatic Al4 system stabilized by a combination of N-heterocyclic carbene (NHC) ligands and mono-anionic organic substituents. X-ray crystallographic analysis showed a planar, centrosymmetric rhombic geometry, with two diagonal aluminum atoms coordinated to aryl substituents and the other two coordinated to redox-innocent NHC ligands. Quantum-chemical computations support the 2π aromaticity of the Al4 cluster. This discovery represents the first example of a neutral planar all-aluminum aromatic system, opening new avenues for the design and synthesis of novel all-metal aromatic species.NMR spectra; UV-vis spectra; Crystal structure determination; Computational details; Cartesian coordinates; Additional references.Supporting information for: Dhara D, Endres L, Souza C, Dewhurst R, Zlatar M, Fantuzzi F, Braunschweig H. A Neutral All-Aluminum Aromatic. ChemRxiv, 2025, [https://doi.org/10.26434/chemrxiv-2025-hxz3v]Preprint: [https://cer.ihtm.bg.ac.rs/handle/123456789/9120
Stogodišnjica kvantne teorije u Beogradu: CEQPAS i MOLESs inicijativa
No full textThe first week of November 2025 saw two events in Belgrade celebrating one hundred years of quantum mechanics and its impact on chemistry and molecular science. The Centennial of Quantum Theory: Progress in Atomic and Molecular Structure (CEQPAS) brought together researchers from across Europe and beyond to reflect on the scientific legacy of quantum theory and to showcase current advances in atomic and molecular spectroscopy, collision processes relevant to plasma research, chemical bonding, quantum chemistry, and the design of functional molecules, astrochemistry, the use of AI/ML for the analysis and generation of atomic and molecular data, and wider applications of quantum science. Immediately after CEQPAS, a new international initiative was launched: MOLecular Excited State spectroscopy (MOLESs), whose primary goal is to develop an atlas of molecular electronic structure and excited-state spectroscopy that rigorously integrates experiment and theory. Together, CEQPAS and MOLESs align historical perspective with future capability, positioning Belgrade as a regional hub for quantum-enabled molecular science.Прва недеља новембра 2025. године у Београду била је обележена одржавањем два догађаја посвећена стогодишњици квантне механике и њеном утицају на хемију и молекулскенауке.Конференција Centennial of Quantum Theory: Progress in Atomic and Molecular Structure(CEQPAS) окупила је истраживаче из Европе и света како би дискутовали онаучномнаслеђуквантне теорије и представилиактуелна достигнућа у атомској и молекулској спектроскопији, сударним процесима релевантним зафизикуплазме, анализи хемијскевезеи дизајну функционалних молекула, астрохемији, примени вештачке интелигенције и машинског учења у анализи и генерисању атомских и молекулских података, као и у ширим применама квантне науке. Одмах по завршетку CEQPAS-а покренута је нова међународна иницијатива: MOLecular Excited State spectroscopy (MOLESs), чији је примарни циљ развој атласа електронске структуре и спектроскопије ксцитованихстања молекула који ће ригорозноинтегрисатиексперимент и теорију. Заједно, CEQPAS и MOLESs повезују историјску перспективу са будућим могућностима, позиционирајући Београд као регионални центар молекулских наука заснованих на квантној механици.The authors acknowledge the framework of the International Year of Quantum Science and Technology (IYQ2025), proclaimed by the United Nations and coordinated with the support of UNESCO, under which CEQPAS and MOLESs were organised.The accepted version of the manuscript: [https://cer.ihtm.bg.ac.rs/handle/123456789/9008
Hemp membranes with anionic functionalization for efficient removal of cationic pollutants
No full textThe primary aim of this study is to develop a membrane from treated waste hemp fibers using a dimethyl sulfoxide/tetra-n-butylammonium hydroxide (DMSO/TBAOH) solvent system and citric acid (CA) as an efficient adsorbent for the removal of cations and cationic dyes from water. The bio-renewable membrane (cHM) was prepared at the appropriate molar ratio of functional groups, which provided multiple functionalities for effective removal of cationic pollutants. The formed lignocellulosic cHM adsorbent was characterized in terms of its physicochemical, structural, and morphological properties through point of zero charge (pHPZC), porosity, Scanning Electron Microscopy (SEM), and Attenuated Total Reflectance Fourier Transform Infrared Spectroscopy (ATR-FTIR) measurements. Pore size was determined using image analysis and the dry-wet weight method. The effects of pH, initial concentration, temperature, and contact time on adsorption were studied in batch adsorption experiments. The membrane demonstrated high adsorption capacities for cationic pollutants, with values of 398.7 mg g-¹ for Safranine O (SO), 370.60 mg g-¹ for Methylene Blue (MB), and 445.4 mg g-¹ for Crystal Violet (CV), following Langmuir model fitting at 25°C. The adsorption process was found to be endothermic, spontaneous, and efficient, highlighting the membrane's potential for water purification. The kinetic parameters of the adsorption process were fitted to both pseudo-first- order and pseudo-second-order models. The five adsorption-desorption cycles yielded effluent waters rich in desorbed pollutants. Photocatalytic degradation of the desorbed dyes using commercial TiO2 as a catalyst, along with the chemical precipitation of cations into solid form, resulted in treated water that met current legislative standards. Biodegradability tests of the spent membrane confirmed its environmentally safe disposal after 85% degradation. This work demonstrates the application of green chemistry in transforming waste biomass into a high- performance adsorbent for wastewater treatment, offering an eco-friendly technology for water purification.EEM2025 - 9th International Congress Engineering, Environment and Materials in Process Industry; 2-4 april 2025; Bijeljina, Republic of Srpska, Bosnia and Herzegovina
Biomasa i lignocelulozni materijali kao osnova efikasnih biosorbenata za uklanjanje teških metala i toksičnih tekstilnih boja iz otpadnih voda
No full textIz brojnih industrijskih aktivnosti generišu se ogromne količine otpadnih voda koje sadrže
organske i neorganske zagađujuće supstance. Postojani joni teških metala, štetnih boja i drugih
zagađujućih materija u otpadnim vodama iz industrije mineralnih sirovina, tekstilne, hemijske i
farmaceutske industrije mogu dovesti do degradacije životne sredine kada se vode odlažu na
neodgovarajući način. Zabrinutost se javlja zbog tako nastale kontaminacije vodenih ekosistema
jer ona dovodi do dugoročnih štetnih posledica na živi svet u vodi i na zdravlje ljudi. U smislu
održivosti, da bi se izbegli skupi konvencionalni tretmani otpadnih voda čijom primenom se troši
mnogo energije i hemijskih agenasa, teži se pojednostavljenju metoda i sirovina. Lignocelulozna
biomasa različitog porekla koja je dostupna u izobilju, jeftina, laka za rukovanje, biorazgradiva i
bioobnovljiva, obećavajući je materijal za biosorpciju. Različiti tipovi biomase i lignoceluloznog
materijala kao što su otpadne stabljike energetskih i industrijskih biljaka, piljevina, koštice voća,
razne ljuske i slame, celulozna vlakna i komercijalni lignin u formi bio-membrana testirani su u
pogledu njihovog učinka biosorpcije. Korišćenjem otpadne biomase hmelja ispitana je
biosorpcija jona Ni 2+ pri različitim kontaktnim vremenima, a dobijeni rezultat pokazao je
efikasnost uklanjanja od 86% upotrebom ovog biosorbenta. Otpadne stabljike hmelja proučavane
su i za uklanjanje katjonskih boja u šaržnom i sistemu kolone sa fiksnim slojem, a efikasnost
uklanjanja dostigla je 98,4%, 98,8% i 98,5% za malahit zelenu (MG), metilen plavu (MB) i
kristalno ljubičastu (CV) boju. Implementirano je više izotermnih modela gde je dobijeni
maksimalni biosorpcioni kapacitet iznosio 398,9, 209,8 i 133,2 mg g -1 za MG, MB i CV
respektivno. Urađeni su prošireni kinetički eksperimenti za valorizaciju energetske biljke Arundo
donax gajene u Srbiji za biosorpciju jona Co 2+ iz vodenog rastvora. Kinetička studija pokazala je
da biosorbovana količina Co 2+ jona dostiže maksimalnu vrednost kapaciteta adsorpcije koja
iznosi 33,83 mg g -1 nakon približno 360 minuta od početka adsorpcije.
Membrana na bazi celuloze modifikovana magnetitom pokazala se vrlo efikasnom u uklanjanju
jona Ni 2+ , Pb 2+ , Cr (VI) i As (V), a adsorpcioni kapaciteti iznosili su 88,2, 100,7, 95,8 i 78,2
mg·g -1 . Drugi tip bio-membrana na bazi modifikovane celuloze, lignina i taninske kiseline takođe
se pokazao kao vrlo efikasan sa ostvarenim kapacitetima adsorpcije od 63,5, 115,8, 127,5 mg·g -1
za Ni 2+ , Pb 2+ i Cr (VI) redom. Rezultati sprovedenih eksperimenata svedoče da je biosorpcija
toksičnih jona metala i boja upotrebom testirane nemodifikovane biomase ili modifikovanog
lignoceluloznog materijala u šaržnom i protočnom sistemu, isplativa i ekološki pogodna metoda
sa visokom efikasnošću.Predavanje - Srpsko hemijsko društvo, Podružnica SHD Bor, Tehnički fakultet u Boru, 13/05/2025, Bor, Srbij
Metoda pripremе ekološki prihvatljive nezasićene poliestarske smole niske viskoznosti
No full textPredmet ovog pronalaska je metoda za dobijanje ekološki prihvatljivih nezasićenih poliestarskih smola niske viskoznosti korišćenjem postupka modifikacije terminalnih grupa predpolimera reaktivnim rastvaračem iz bio-obnovljivih izvora. Metoda se zasniva na upotrebi dimetil itakonata kao reaktivnog rastvarača, koji bi mogao istovremeno da se koristi i za modifikaciju terminalnih grupa predpolimera i za umrežavanje smole. Ovom metodom se postiže kontrolisano zaustavljanje rasta lanca predpolimera modifikacijom terminalnih hidroksilnih grupa dimetil itakonatom. Na ovaj način se eliminiše potreba za upotrebom toksičnih, ekološki neprihvatljivih rastvarača, koji se koriste u postojećim tehnologijama. Primenom ove metode dobijaju se ekološki prihvatljive smole niske viskoznosti što može da olakša i njihovu preradu i omogući širok spektar primena, uz istovremeno smanjenje negativnog uticaja na životnu sredinu.Broj prijave П-2025/045
Еngineering multimetallic oxides for enhanced oxygen evolution in green energy applications
No full textThis paper investigates the synthesis and characterization of potential catalysts for oxygen evolution reactions (OER) using Ce, Y, Yb, Pr, Dy and Nd rare earth elements (REEs) in
combination with transition metals Co and Mn. Multivalent oxides were synthesized via
ultrasonic spray pyrolysis (USP) in a single-step process, utilizing metal salt precursors.
Structural and morphological analyses (XRD, SEM/EDS) confirmed the formation of
homogeneous oxide phases with controlled composition while electrochemical studies
(CV, LSV, PEIS, C-DC) demonstrated enhanced catalytic activity, excellent stability, and
favorable charge transfer kinetics in alkaline media. The results reveal that the engineered
multivalent oxides exhibit superior OER performance compared to conventional catalysts
attributed to the synergistic effects of REEs and transition metals in promoting electron
transfer and surface reactivity.
These oxides are designed for application either as standalone catalysts or as core
materials in core-shell systems where they serve as efficient supports to minimize the use
of expensive nobler metals such as iridium and tantalum. By strategically incorporating
these multivalent oxides as core structures, the nobler metal content can be significantly
reduced while maintaining high catalytic efficiency thus improving cost-effectiveness and
long-term sustainability. This approach aligns with the growing demand for scalable,
durable and resource-efficient electrocatalysts for energy storage and conversion
applications.
The findings of this study provide valuable insights into the design of next-generation
catalysts for green energy technologies including water electrolysis, metal-air batteries
and fuel cells. By leveraging the unique properties of multimetallic oxides this work
contributes to the development of efficient, low-cost and environmentally friendly
alternatives to traditional noble-metal-based OER catalysts ultimately supporting the
transition to cleaner and more sustainable energy solutions