Претрага

Упит dcterms_subject_txt:Adsorption and photocatalytic degradation

2341 items

  • Crystallographic, spectroscopic, thermal and computational studies of polymeric cobalt(II)–mellitate complex with 2,2′-bipyridine

    Lidija Radovanović, Dušan P. Malenov, Marko V. Rodić, Aleksandar Kremenović, Jelena Rogan (2021)
    Orange single crystals of new polymeric cobalt(II) complex {[Co(bipy)(H2O)4]2[Co(μ-mell)(H2O)2]·10H2O}n, 1, were synthesized by slow evaporation method at room temperature (bipy = 2,2′-bipyridine, mell = hexaanion of mellitic acid) and its crystal structure was determined by single-crystal X-ray diffraction. The complex 1 was characterized based on elemental analysis, FTIR spectroscopy and thermal (TG/DTA) analysis followed by computational analysis of noncovalent interactions and quantum chemical calculations of interaction energies. In 1, two crystallographically different Co(II) atoms adopt a deformed octahedral geometry, ...
    Inorganic Chemistry, Organic Chemistry, Spectroscopy, Analytical Chemistry

  • Some examples of interactions between certain rare earth elements and soil

    Zlatko Nikolovski, Jelena Isailović, Dejan Jeremić, Sabina Kovač, Ilija Brčeski (2021)
    Freundlich adsorption isotherm, sequential extraction, metallic ions, ICP-OES
    ... ELEMENTS AND SOIL 5 quantity of adsorbate remaining in the equilibrium solution following adsorption, whereby the distribution between the liquid and solid phase of adsorption solution for different concentrations is presented. Most often by adsorption isotherms the information on adsorption intensity ...
    ... Table II, it was possible to determine Fre- undlich adsorption isotherms for lanthanum and gadolinium ions in the clay and sand type of soil and erbium ions in the sand soil (Fig. 2). The values for Freundlich isotherm constant (kf) and adsorption intensity (n) have been provided in Table V. ...
    ... their nature and ionic forces. CONCLUSION The impact between the soil and rare earth elements and the soil capacity to adsorb these elements has been studied. Freundlich adsorption isotherms for the lanthanum, erbium and gadolinium have been presented in two soil types, the clay and sand soils ...

  • Conversion of land areas after coal mine closure and reclamation

    Radmila Gaćina, Bojan Dimitrijević, Sanja Bajić (2023)
    Otkopavanje uglja površinski i podzemno praćeno je degradacijom zemljišta, promenom formiranja predela i izmenom flore i faune. Od velikog značaja je razvoj novih naučno utemeljenih pristupa obnovljanje antropogeno poremećenih predela zasnovanih na formiranju rekultivacionih i rudarskih tehnologija. Apsolutno je neophodno obezbediti sveobuhvatno kvalitetno očuvanje zemljišnih i vodnih resursa i odrediti rekultivisano zemljište za novu namenu. U ovom članku je dat pregled najpopularnijih metoda rekultivacije zemljišta i mogućnosti rekultivacije zemljišta nakon završetka rekultivacije i zatvaranja rudnika uglja.
    rekultivacija, melioracija, revitalizacija, otkopavanje uglja, održivi razvoj
    ... accompanied by the degradation ofland, change in landscape formation and changing the flora and fauna. It is significantly vital to develop new scientifically grounded approaches to the restoration ofanthropogenically disturbed landscapes based on the formation of reclamation and mining technologies ...
    ... affect the degradation of agricultural lands. Predictions of the effects on the environment are very important and present the concern in the sense of the loss of surface area and space for living. The study on the environment has a basic description of the effects that are expected, and it is a basic ...
    ... transport, storage and treatment of mineral resources and the working of quarries). According to the Serbian Law on Mining, technical and biological reclamation and spatial arrangement must be performed with the purpose of environmental protection, regeneration, land reclamation and arrangement of the ...

  • Ocena kvaliteta i mogućnost korišćenja podzemnih voda za piće i navodnjavanje u slivu reke Ralje

    Sunčica Ninković, Nebojša Atanacković, Sava Magazinović, Jakov Andrijašević, Mihailo Šević (2016)
    Analiza mogućnosti korišćenja podzemnih voda za potrebe vodosnabdevanje stanovništva kao i za navodnjavanje vršena je na prostoru sliva reke Ralje. Istražni prostor veličine oko 280 km2 je obuhvatio veći deo sliva reke Ralje koji se administrativno nalaze na području grada Beograda. Podzemne vode su glavni izvor za vodosnabdevanje i navodnjavanje u ovom području. Seoska naselja nemaju urađenu komunalnu infrastrukturu pa predstavljaju značajan faktor za degradaciju kvaliteta podzemnih voda na ovom području. U periodu 2012-2014 godine prikupljeno je 100 uzorka ...
    kvalitet voda, hidrohemijski parametri, navodnjavanje, zagađenje, reka Ralja

  • Asbestos-Based Pottery from Corsica: The First Fiber-Reinforced Ceramic Matrix Composite

    Philippe Colomban, Aleksandar Kremenović (2020)
    Asbestos-containing pottery shards collected in the northeast of Corsica (Cap Corse) and dating from the 19th century, or earlier, have been analyzed by SEM-EDS, XRPD, FTIR and Raman microspectroscopy. Blue (crocidolite) and white (chrysotile) asbestos fiber bundles are observed in cross-sections. Most of the asbestos is partly or totally dehydroxylated, and some transformation to forsterite is observed to occur, indicative of a firing above 800 C. Examination of freshly fractured pieces shows a nonbrittle fracture with fiber pull-out, consistent with ...
    asbestos, CMC, Corsica, fiber, pottery
    ... to identify large amounts of antigorite and chlorite-serpentine and minor amounts of (heated) actinolite, crocidolite (riebeckite), talc and quartz in sample d (Figure 5 bottom). Talc (MgaSiaOio(OH)) results from the degradation of amphiboles and pyroxenes and belongs to the phyllosilicate group ...
    ... Chadwick, B.M.; Frankiss, M.G. Vibrational spectra and structures of polycrystalline KAg(CN)>, NaAg(CN)> and TIAg(CN). J. Mol. Struct. 1968, 2, 281–285. [CrossRef] Jia, Y.E.; Steele, C.J.; Hayward, L.P.; Thomas, M. Mechanisms of adsorption of gold and silver species on activated carbons. Carbon 1998 ...
    ... periphery become progressively very noisy due to the degradation that becomes more and more important when approaching the surface of the grain. The firing conditions (temperature, heating, rate, levels, etc.) therefore limit degradation, and the fibers are generally preserved, as evidenced by ...

  • Legal framework for recultivation of degraded areas caused by mining exploitation

    Radmila Gaćina (2023)
    Prilikom površinske i podzemne eksploatacije uglja eksploatacioni sistemi oštećuju veće ili manje površine zemljišta. Iskustva pokazuju da su oštećenja zemljišta znatno veća kod površinske eksploatacije, gde je prostora degradiran ne samo u konturi rudnika i okoline, već se promene takođe dešavaju u prirodnom okruženju. U članku su predstavljeni rezultati studije zakonskih okvira rekultivacije u nekim zemljama sveta i u Srbiji. Praktično iskustvo rekultivacije pokazalo je da iskorišćenje i devastacija tokom rudarske aktivnosti predstavljaju opasnost ne samo za pogođena ...
    rekultivacija, melioracija, otkopavanje uglja, zakonska regulativa
    ... land, the state before degradation. Revitalization is the term that covers both stages: reclamation and land development, and it means the state restoration, giving the opportunity to perform the utility function of this area. According to Jancura and Belachek (Jancura and Belachek, 2003), the ...
    ... Ministries and their functions. Table 2 Relevant mining authorities and recultivation after degradation administration in countries Country The Competent Regulatory Supervisory Advisory Ministry function function function Serbia Ministry of Sectorfor Mining Not Mining and geology and Inspection ...
    ... of preventing environmental damage and also for humans. Mineral and coal mining often increases soil density, erosion, sedimentation, landslides, disruption of flora and fauna, and disruption of public health, which leads to microclimate change (Goudie and Viles, 2013). The post-mining impacts ...

  • Interaction of sodium dodecylsulfate (SDS) with homoionic montmorillonites: adsorption isotherms and metal-ion release

    M. Ilic, J. Gonzalez, A. Pohlmeier, H. D. Narres, M. J. Schwuger (1996)
    The interaction of dodecylsulfate anions (DS−) with homoionic Ca-, Mg-, Ni-, Cu-, Cd-, Pb- and Fe-montmorillonites were investigated. Mg- and Cd-montmorillonite do not adsorb DS−, and an anion exchange at the edges of the clay mineral does not take place. Three different adsorption processes are identified on the other montmorillonites: i) Fe-montmorillonite is covered with amorphous iron hydroxide, and DS−-anions are bound at positively charged sites. ii) On Ca- and Pb-montmorillonite DS− is precipitated as Me(DS)2. iii) On Ni- ...
    Натријум додецилсулфат, адсорпциона преципитација, монтморилонит

  • Damage quantification of built stone on Dark Gate (Belgrade, Serbia): sample of damage index application for decay rate evaluation

    Maja Franković, Nevenka Novaković, Vesna Matović (2015)
    The Dark Gate is the monument of culture, part of the cultural and historical complex of the Belgrade Fortress. It is constructed of limestone blocks that after 270 years of exposure to environmental conditions and different anthropogenic influences show wide ranges of decay forms. During 2007, detail registration of all built limestone microfacies and weathering forms was done using tools of monument mapping. A correlation scheme ‘‘intensity– damage category’’ was made according to the type, intensity, and distribution of ...
    Krečnjak, mapiranje, Indeks raspadanja, brzina raspadanja, progresija
    ... stone and assess degradation rate over the past 7 years. Documentation created in 2007 was compared with the stone condition by direct examination in situ and also by taking new photographs and comparing old and new photo documentation. Changes in final damage cate- gories were noted and mapped ...
    ... differentiate between their susceptibility to degradation. Correlations among intensity of weathering forms and damage category in relation to orientation of gate parts reveal very interesting: data. Looking at the facades ori- ented to south and north and theirs results of mapping damage category ...
    ... mechanisms and effects of salts on degradation of monuments in marine and continental environment”Bari: C.U.M. University school of monument conservation, p 347–355 Fitzner B, Heinrichs K, La Bouchardiere D (2002a) Damage index for stone monuments. In: Galan E, Zezza F (eds) Protection and conservation ...

  • Određivanje zbijenosti starog komunalnog otpada

    Jovana Janković, Dragoslav Rakić, Irena Basarić Ikodinović, Tina Đurić (2021)
    Bez obzira na savremene tretmane komunalnog otpada u svetu, u Srbiji je i dalje najčešći vid odlaganja na komunalne deponije, pa zbijanje otpada predstavlja jednu od ključnih faza formiranja deponije. Na ovaj način znatno se smanjuje zapremina otpada, ubrzava proces degradacije i produžava radni vek deponije. Zbog toga su geotehničke karakteristike komunalnog otpada prilikom zbijanja, veoma bitne kako u fazi projektovanja tako i u fazi izgradnje deponije i optimizacije prostora. Tu se pre svega misli na maksimalnu suvu zapreminsku ...
    komunalni otpad, deponija, Proktorov opit, optimalna vlažnost, maksimalna suva zapreminska težina

  • Geoenvironmental Investigations at a Smelter Location in Bor (Serbia)

    Petar Papić, Zvonimir Milijić, Jana Stojković, Jovana Milosavljević, Maja Todorović, Marina Ćuk, Željko Kamberović (2014)

  • Microstructural and magnetic properties of electrospun hematite/cuprospinel composites

    Mira Ristić, Aleksandar Kremenović, Michael Reissner, Željka Petrović, Svetozar Musić (2020)
    Phase composition, microstructural and magnetic properties of electrospun hematite/cuprospinel composites were investigated. Samples were synthesized starting with 0 to 10 mol% of copper relative to iron. The round shape of reference electrospun fbres was preserved upon their heating up to 600 °C in air, whereas at 700 °C hollow substructure was additionally formed. In these reference samples the presence of hematite phase was detected by XRPD. A small amount (traces) of Fe3O4 /γ-Fe2O3 was also found, due to the ...
    Electrical and Electronic Engineering, Condensed Matter Physics, Atomic and Molecular Physics and Optics, Electronic, Optical and Magnetic Materials

  • A comparative study of the molecular and isotopic composition of biomarkers in immature oil shale (Aleksinac deposit, Serbia) and its liquid pyrolysis products (open and closed systems)

    Gordana Gajica, Aleksandra Šajnović, Ksenija Stojanović, Jan Schwarzbauer, Aleksandar Kostić, Branimir Jovančićević (2021)
    The molecular and isotopic composition of biomarkers in initial bitumen isolated from immature (0.41% Rr) oil shale samples (Aleksinac deposit) and liquid products obtained by pyrolysis in open (OS) and closed (CS) systems are studied. The influence of pyrolysis type and variations of kerogen type on biomarkers composition and their isotopic signatures in liquid products is determined. The applicability of pyrolysis type, numerous biomarkers and carbon isotopic compositions (δ13C) of n-alkanes in liquid pyrolysates is established. Pyrolysis experiments were ...
    Uljni šejl, Aleksinac, organska supstanca, otvoreni i zatvoreni sistem pirolize, biomarkeri, izotopski sastav ugljjenika

  • Hidrogeološke karakteristike područja Cerničkog polja (Istočna Hercegovina) sa posebnim osvrtom na rizik od zagađena podzemnih vodnih resursa

    Petar Vojnović (2023)
    ... Voda (V) V-1. Milica Svetozarević, Nataša Šekuljica, Ana Dajić, Marina Mihajlović, Zorica Knežević- Jugović, Dušan Mijin: Continuous flow for degradation of dyes. Value added utilization of potato peel V-2. Aleksandar Jovanović, Mladen Bugarčić, Nataša Knežević, Miroslav Sokić, Vladimir Pavićević ...
    ... Miroslav Vujičić, Dušanka Cvijanović, Snežana Radulović: Linking for excellence, building competencies, and supporting climate change resilience and mitigation – ExtremeClimTwin, GreenSCENT and Restore4Life OR-2. Sandra Stamenković Stojanović: Formulisanje i optimizacija mikrobiološkog preparata ...
    ... слободном приступу. - Претрага репозиторијума доступна је на www.dr.rgf.bg.ac.rs The Digital repository of The University of Belgrade Faculty of Mining and Geology archives faculty publications available in open access, as well as the employees' publications. - The Repository is available at: www.dr.rgf ...

  • Adsorption and Polymerization of Aniline on Cu(II)-Montmorillonite:  Vibrational Spectroscopy and ab Initio Calculation

    M. Ilić, E. Koglin, A. Pohlmeier, H. D. Narres, M. J. Schwuger (2000)
    Batch adsorption experiments in the presence of oxygen were performed to study the interlayer reactions of aniline on Cu(II)-montmorillonite in aqueous solutions. At concentrations below a critical value of CC ) 2.6 mmol dm-3 only a colored Cu(II)-aniline complex is formed, characterized by a stability constant of log(Kassoc/dm3 mol-1) ) 1.5. At concentrations beyond Cc aniline polymerizes yielding a dark brown product, which is identified by two vibrational spectroscopy techniques, attenuated total reflection Fourier transform infrared (ATR-FTIR) spectroscopy and ...
    Анилин, адсорпција, полимеризација, Cu(II)-Монтморилонит, ФТИР, аб инитио прорачун

  • Mineral Resources of Serbia: Environmental, Societal and Economic Challenges

    Vladimir Simić, Rade Jelenković, Dragana Životić (2019)
    ... from wastewaters using photolytic, photocatalytic and microbiological degradation processes was investigated (Kuburović et al. 2007; Kuburovic et al. 2009). Based on the results of this research it was concluded that photolytic and photocatalytic degradation of MTBE should be applied to decrease ...
    ... Photolytic, Photocatalytic and Microbiological Degradation Processes. Desalination 213 (1—3): 123—28. doi: 10.1016/j.desal.2006.03.605. Kuburović, N., Golubovic, A., Todorovic, Z., Gasic, S., Solevic, T. (2009). Photocatalytic degradation of wastewater polluted by MTBE using titanium-dioxide and doped ...
    ... of physical and social environmental degradation, the main sources of pollution on the sites included. Intensive mining of mineral ores in Serbia has caused exhaustion of non-renewable natural resources and pollution of water, air and soil, and significant deterioration and degradation of soils. ...

  • Self-Engineering: Possibilities for Maintenance Operations in the Mining Machines Industry

    Steven Manders, Milorad Pantelić, Vladimir Milisavljević, Alberto Martinetti (2021)
    Self-engineering is a relatively new branch of knowledge that aims to understand how systems could “autonomously” re-configure or repair themselves without the intervention of the operators. A direct field of application is within the maintenance spectrum. Having systems or machines capable of self-detecting or even self-repairing could represent a game-changer, in capital asset fields such as the mining industry in particular. This paper aims to investigate the possible benefits and challenges of self-engineering / self-maintenance concerning mining machines, specifically bucket-wheel ...
    self-engineering, self-maintenance, maintenance operations, mining industry, bucket-wheel excavator, gearbox revitalization

  • A WebGIS Decision Support System for Management of Abandoned Mines

    Ranka Stanković, Nikola Vulović, Nikola Lilić, Ivan Obradović, Radule Tošović, Milica Pešić-Georgiadis (2016)
    ... taken into account: (a) the physical degradation of the surface, relief and environment that took place, especially in the case of improper and unplanned exploitation; (b) the impact of mineral substances present in the exploited deposits on environmental features; and (c) the impact of various municipal ...
    ... the morphology of the terrain have been detected and outlined, regardless of their area and the time of occurrence. According to the detection criteria, different types of surface changes were outlined, as follows: wide area affected by degradation, abandoned old mines, landfills (industrial or municipal ...
    ... login and activity information to identify responsibility for entered data and general system usage. 2.2.1. Stakeholder Data The application module dedicated to administration of data related to companies, institutions and organizations i.e., stakeholders and beneficiaries, in tabular and detailed ...

  • Valorization of non-balanced coal reserves in Serbia for underground coal gasification

    David Petrović, Lazar Kričak, Milanka Negovanović, Stefan Milanović, Jovan Marković, Nikola Simić, Ljubisav Stamenić (2019)
    In the name of a better and safer energy future, it is our responsibility to focus our knowledge and activities to save on imported liquid and gas fossil fuels, as well as coal on which energy security of Serbia is based. The rationalization in the use of available energy resources certainly positively affects economy and the environment of a country. This paper indicates motivations for the application of the underground coal gasification process, as well as surface gasification for ...
    ugalj, gasifikacija, zaštita životne sredine, skladištenje, solarna
    ... environmental benefits are also exceptional. Utilization of UCG method does not generate any slag and ash, there is no degradation of the terrain comparing to the un- derground exploitation of coal, and also no special needs for terrain recultivation. During gas combustion in burners there are no ...
    ... to 1 MJ of energy), — there is no significant degradation of the terrain, since all the non-combustible substances (slag or ash) remain in the deposits bencath the surface of the earth, — there is no substantial pollution of the environment and the working environment, as there are no solid ...
    ... activated, and the coke burns the surrounding coal and forms the reaction zone. Exothermic reactions (at f > 600 "C) are predominantly occurring in UCG process, and the resulting gas mixture can contain 8-20% CO», 5-20% CO, 10-20% H», and 2-5% CHoa. Ifthe gas mixture contains too much CO., and possibly ...

  • Characterization and Environmental Evaluation of Recycled Aggregates from Construction and Demolition Waste in Belgrade City Area (Serbia)

    Filip Abramović, Miroslav Popović, Vladimir Simić, Vesna Matović, Radmila Šerović (2024)
    General Materials Science

  • FTIR spectroscopic study оf S-мetolachlor сorption оn inorganic and organically modified montmorillonite from Bogovina

    Lazar Kaluđerović, Zorica Tomić, Jelena Bogosavljević, Ljubomir Životić, Maja Milošević (2021)
    ... to lower wavenumbers and (3) disappearance of 1363 cm'! band (C=C-N vibrations) after adsorption. According to the literature, one of the most important mechanisms of the herbicide adsorption on PTMA - montmorillonite is a-x: bonding between benzenc the ring of the herbicide and aromatic ring of ...
    ... are in the interlayer space and/or oxygen on the surface of the tetrahedral sheet of the montmorillonite. Keywords: adsorption, S-metolachlor, HDTMA, PTMA, infrared spectroscopy INTRODUCTION The high solubility of some herbicides negatively affects their efficiency and therefore causes serious ...
    ... P..2012. NIR and MIR spectroscopic characteristics of hydrophilic and hydrophobic bentonite treated with sulphuric acid. Vib. Spectrosc., 58, 95-—103. DOI: 10.1016/J.vibspec.2011.11.002 Tomić, P.Z., Ašanin, P.D., Đurović-Pejčev, R., Đorđević, A., Makreski, P., 2015. Adsorption of Acetochlor ...