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Registered conference abstracts

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Registered contributions

Total number of registered contributions: 10

Registered talks

  1. New NiII-III double-layered hydroxide minerals in hydromorphic soils similar to FeII-III “green rust” related minerals in gleys – improvements for the exploitation of nickel mines
    Author(s): Jean-Marie R. Génin, et al.
    Institution: Polytech-Nancy, Université de Lorraine, Vandoeuvre-lès-Nancy
    Abstract: The biogeochemical cycle of iron in hydromorphic soils is well documented since the discovery of the three minerals, fougèrite (IMA 2003-057), trébeurdenite and mössbauerite (IMA 2012-049) that give the bluish-green shade of gleys of general formula FeII6(1-x) FeIII6xO12H2(7-3x)CO3, nH2O where n ≤ 3 so that (i) at x = 1/3, fougèrite is FeII4 FeIII2(OH)12CO3, nH2O, (ii) at x = 2/3, trébeudenite is FeII2 FeIII4O12H10CO3, nH2O and (iii) at x = 1, mössbauerite is FeIII4O12H8CO3, nH2O. Synthetic samples of usually called “green rusts” are made by coprecipitation of ferrous and ferric salts followed by an in situ deprotonation using H2O2. Any x value can be reached by topotaxical reactions of ordered domains of three ferrimagnetic phases with Néel temperatures of 5, ~30 and ~80 K for x = 1/3, 2/3 and 1, respectively. Characterization of the minerals is done from gleysoils by 57Fe Mössbauer spectra since iron concentration hardly exceeds 5 %.
    Ni(II-III) minerals in nickel fields could be characterized by 61Ni Mössbauer spectra using a synchrotron such as ESRF in Grenoble (France) – they do have a similar crystal structure of double-layered hydroxide (DLH) as observed by XRD that displays the same stacking of cationic layers and anionic interlayers. However, a difference is that x values are now 1/4, 1/2, 3/4, 1 and ordered phases with formula NiII8(1-x) NiIII8x O16 H2(9-4x) CO3, nH2O with n ≤ 4: (i) at x = 1/4, it is NiII6 NiIII2 (OH)16 CO3, nH2O, (ii) at x = 1/2, it is NiII4 NiIII4 O16 H14 CO3, nH2O, (iii) at x = 3/4, NiII2 NiIII6 O16 H12 CO3, nH2O and (iv) at x = 1, it is NiIII8 O16 H10 CO3, nH2O. We propose that IMA christens NiII6 NiIII2 (OH)16 CO3, nH2O, herbillonite. One chooses x = 1/4 by analogy with the head of the hydrotalcite supergroup MgII6 AlIII2 (OH)16 CO3, nH2O, but also to pyroraurite MgII6 FeIII2 (OH)16 CO3, nH2O. NiII-III minerals found in nickel fields may improve the extraction of nickel for stainless steels.
  2. Mössbauer Study of the Role of Iron in Exfoliation of Kaolinite
    Author(s): Zoltán Homonnay, Ernő Kuzmann, János Kristóf, Clara Parameswary, Maria Gracheva, Erzsébet Horváth
    Institution: Eötvös Loránd University, Institute of Chemistry, Budapest
    Abstract: Mössbauer Study of the Role of Iron in Exfoliation of Kaolinite Z. Homonnay1, E. Kuzmann1, J. Kristóf2, C. Parameswary1, M. Gracheva1, E. Horváth2 1 Institute of Chemistry, Eötvös Loránd University, Budapest, Hungary 2 Institute of Environmental Engineering, University of Pannonia, Veszprém, Hungary The practical utilization of kaolinite-type minerals consisting of a two-dimensional arrangement of Si-centered tetrahedral and Al-centered octahedral sheets (TO or 1:1 type) depends on their surface reactivity. The industrial application of these materials as fillers, carriers or catalyst supports shows an increasing tendency. One of the most important results in the field of clay research during the last decade was the discovery of the photocatalytic activity of exfoliated kaolinite. This is of high importance from environmental (technological) point of view. The cheap and abundant TO-type clay minerals can also contain mineral contaminants of photocatalytic nature (e.g. goethite, hematite, anatase) or structural iron incorporated in the mineral backbone. Therefore, it is important to understand the effect of parameters influencing surface reactivity in order to obtain materials (as well as composites, or hybrids) with tailored surface properties. In the light of this, Mössbauer spectroscopy proved to be a key tool in the structure elucidation of iron-contaminated clay minerals. Kaolinites from Petény region, Hungary, were studied under various conditions and treatments in order to find correlation between readiness for exfoliation and the iron species found in this kaolin with relatively high natural iron content. In the pristine kaolin samples iron was found in three different forms (phases) including, first, hematite that could be easily dissolved by acidic treatments. The second phase, resembling mainly to goethite, showing magnetically relaxed spectra at room temperature was also found, however this proved to be highly resistant to acidic dissolution that may be attributed to substantial Al impurity. The third phase contained FeIII and FeII species assigned to the kaolinite structure, substituting for Al at the octahedral lattice sites. Isotope exchange of these structural iron species with enriched 57Fe was successful. This opens a way to study sensitively the possible interaction of the chemicals applied in the exfoliation process (K-acetate, ethylene-glycol, n-hexyl-amine) with the structural iron. These interactions may hinder the exfoliation process, as observed in many cases. First Mössbauer results of kaolinite samples will be discussed. Presenting author: Zoltan Homonnay Institution: Eötvös Loránd University Address: Pázmány P. s. 1/A, Budapest 1117, Hungary E-mail: homonnay@caesar.elte.hu
  3. Water purification and characterization of iron-aluminosilicate glass prepared by Sol-gel method
    Author(s): Irfan Khan, et al.
    Institution: Tokyo Metropolitan University, Tokyo
    Abstract: Iron-containing silicate glass can be a good candidate for effective water purification. Hematite (α-Fe2O3) is a suitable material, due to its photocatalytic properties and low band gap energy [1]. In our previous study, precipitated α-Fe2O3 could be detected from the 57Fe-Mössbauer spectra of iron-containing silicate glass prepared by the sol-gel method [2] and melt-quenching method [3]. It showed a high rate constant of 2.87×10-2 h-1 [3] for methylene blue (MB) decomposition under visible light. In this study, we report the water purification ability and electronic conductivity of iron containing aluminosilicate glass with the composition of 40Fe2O3 • yAl2O3 • (60 – y ) SiO2 (in mass%, y = 0, 10, 15 and 20), abbreviated as 40FyAS. The samples prepared by the sol-gel method and subsequent calcination of the obtained dried gels at 1000 oC for 100 min were investigated by means of Low-temperature 57Fe-Mössbauer spectroscopy, TG-DTA, FT-IR, TEM, Impedance spectroscopy, and ultraviolet-visible light absorption spectroscopy (UV-VIS). The 57Fe-Mössbauer spectrum of 40FyAS glass was composed of two different doublets due to fayalite with constant isomer shift (IS) of 1.26 mm s-1 and quadrupole splitting (QS) of 2.97 mm s-1, Fe+3 (Td) with increasing IS from 0.19 to 0.32 mm s-1 and increasing QS from 0.48 to 1.09 mm s-1 as well as three magnetic sextets ascribed to a regular hematite (α-Fe2O3: IS= 0.46, QS= 0.16 mm s-1) and the remaining two belonging to the A and B sites of magnetite.
    From wastewater degradation test, a decrease in the concentration from 285.6 to 45.2 mg L-1 was observed after 7 days when it was mixed with the 40F20AS under visible-light irradiation and yield the highest first-order rate constant of 23.7×10-2 day-1. DC conductivity results revealed that conductivity increases as alumina content increases. It is concluded that precipitation of α-Fe2O3 and the introduction of Al2O3 in the SiO2 matrix are essential for enhancing the visible light photocatalytic activity and electrical conductivity.
    [1] H. Zhang et al., J Mater Chem A, 4 (2014) 1421–1426.
    [2] Y. Takahashi et al., Hyperfine Interact. 226 (2014) 747–753.
    [3] S. Kubuki et al., J. Radioanal. Nucl. Chem. 301(1) (2014) 1–7.
  4. 57Fe Mössbauer Study of Photo-fenton Active Iron-silicates Prepared from Domestic Waste Slag
    Author(s): Shiro Kubuki, Ahmed Salah Ali, et al.
    Institution: Department of Chemistry, Graduate School of Science, Tokyo Metropolitan University, Minami-Osawa 1-1, Hachi-Oji, Tokyo 192-0397, Japan
    Abstract: In order to develop effective photocatalytic materials for wastewater purification, which are prepared by ubiquitous elements and facile methods, our group has paid attention to iron silicate glass-ceramics. Firstly, we could observe a visible-light activated photocatalytic effect for the soda-lime iron silicate of 15NaO•15CaO•50Fe2O3•20SiO2 glass (in wt%) after heat-treatment at 1000 oC for 100 min. This sample decomposed methylene blue in the aqueous solution (MBaq) with the pseudo-first-order rate constant (k) of 4.8•10-4 min-1 under the visible light irradiation [1]. The 57Fe Mössbauer spectrum of this sample contained a sextet with isomer shift (δ) of 0.34 mm s-1 and internal magnetic field (Hint) of 51.8 T, attributable to α-Fe2O3 [1]. The larger k value of 9.3•10-3 min-1 was recorded for heat-treated 15NaO•15CaO•40Fe2O3•11Al2O3•19SiO2 glass, for which the 57Fe Mössbauer spectrum showed the δ of 0.38 mm s-1 and a larger Hint value of 52.4 T attributable to α-Fe2O3 with the defective structure [2]. After confirming the similarity in chemical composition and structure, domestic waste slag (WS) was used as the starting material for a visible-light activated photo-catalyst. Iron silicate, denoted as Na2O+WS+xFe2O3 with x of 10, 30 and 50 wt% showed a constant k values of 2.7•10-3 min-1, for which RT Mössbauer spectra consisted of a paramagnetic doublet with a constant δ of 0.30 mm s-1 and increasing Δ from 0.80 to 1.23 mm s-1 with an increase of Fe2O3 [3]. More interestingly, the largest k value of 22•10-3 min-1 was recorded for WS heat-treated at 800 oC for 100 min by addition of 0.4 mol L-1 H2O2 [4]. The RT Mössbauer spectrum for this sample was composed of a paramagnetic doublet with δ and Δ of 0.38 and 0.92 mm s-1, respectively, attributed to FeIIIO6 octahedra [4]. These results indicate that FeIII-O chemical bond with a δ value of smaller than 0.38 mm s-1 plays an essential role in the photocatalytic ability in iron silicates. It is concluded that the preparation of effective photo-catalysts is the possibility of recycling of solid waste slag containing iron silicate for this application.
    [1] S. Kubuki et al., J. Radioanal. Nucl. Chem., 301(1), 1-7 (2014).
    [2] Y. Iida et al., J. Alloy Comp., 645, 1-6 (2015).
    [3] S. Ishikawa et al., Pure Appl. Chem., 89(4), 535-544 (2017).
    [4] A. S. A. Ali et al., J. Radioanal. Nucl. Chem., 322(2), 751-761(2019).
  5. Environnment and water treatment
    Author(s): BENTAHAR Nourredine, A. Saoud and M.Mansour
    Institution: M'hamed Bougara University, Boumedes
    Abstract: Environment and water treatment Abstract: It is often said that water is not necessary to life ... "Water is simply life" Water is also critical in manufacturing processes in any industry. Water use in a production unit has been greatly reduced by cutting waste and by technological advances. The restrictions go beyond just saving water they require for recycling in the circuits and fire service and water for extra cooling. It is in this context that we have considered the treatment of industrial waste water We have prepared four types of adsorbents that we used in a laboratory facility for the treatment of waste water from the cheese Boudouaou. Les results are satisfactory.
  6. Synthesis of local catalysts and there application for catalytic conversion
    Author(s): BENTAHAR Nourredine, A. Saoud and M.Mansour
    Institution: M'hamed Bougara University, Boumedes
    Abstract: Abstract: Solid catalysts for petroleum refining and catalytic transformations have been developed starting from local Algerian materials, mainly “bentonite“. These catalysts are used for the transformation of the heavy fractions and the residues of the oil by the catalytic processes leading to obtaining clean and environmentally friendly petrol (fuel) as well as petroleum fractions that are considered as important raw materials for petrochemical, pharmaceutical, and cosmetic industry. The preparation of modified catalysts using Algerian local bentonite enriched by oxides to give them a better performance for the validation of certain fractions of oil and condensate is described. References: 1. P. Chemical Engineering Wuithier Paris 1972. 2. Michel Guisnet Ramo and Fernando Ribeiro, an Nanoworld The Zeolites Service of Catalysis, EDP Sciences, Paris 2006. 3. Technologie Oil and Gas No. 1 Moscow 2007. 4. M.Millan, Pillared clays as catalysts for hydrocraking of heavy liquids fuels. Applied Catalysis 2005. 5. Gadi Rothenberg, Catalysis Concepts and Green Applications, Wiley-VCH Verlag GmbH & Co. in Weinheim, Germany 2008

Registered posters

  1. Mössbauer Study of Iron(III) Citrate Aqueous Solutions
    Author(s): Maria Gracheva, Zoltán Homonnay, Amarjeet Singh, Ádám Solti, Krisztina Kovács
    Institution: Eötvös Loránd University, Institute of Chemistry, Budapest
    Abstract: Iron is an essential cofactor in all living organisms. Due to environmental factors iron limitation of the agricultural lands of the world is significant. As a consequence, iron deficiency is one of the most challenging limiting factors of crop production. Since plants represent the major iron source in human nutrition, iron deficiency in plants not only leads to a reduced quality and quantity of plant products, but also promotes development of iron deficiency in human bodies, which is recognized as one of the most common nutritional disorder in the world. Despite this, iron metabolism of mesophyll cells has not been fully revealed yet.
    Iron in the xylem is transported as a citrate complex. Therefore, iron(III) citrate is widely applied as the standard iron source for plant nutrition. However, to investigate iron uptake mechanism in plants it is necessary to take into account the photodegradation of iron(III) citrate. Several authors suggest different photochemical reaction mechanisms for iron(III)-citric acid solutions. However, the reactions rate and final products highly depend on the preparation, light source and experimental conditions. Moreover, most of the works are devoted to studies of citrate degradation products and not much attention is paid to the final state of iron.
  2. Ferrihydrite formed from co-precipitated nanomagnetites in citric acid solution for plant nutrition
    Author(s): Ernö Kuzmann, M. Gracheva, Z. Homonnay, K. Kovács, Z. Klencsár, S. Music, et al,
    Institution: Eötvös University, Institute of Chemistry, Budapest, Hungary
    Abstract: In our previous works we reported about the preparation and characterisation of iron oxide nanoparticles to use them for uptake of essential micronutrients and/or as possible efficient iron fertilizers for plants. The phase and elemental composition, structure, morphology and chemical properties of iron oxide/oxyhydroxide nanoparticles, determined by the individual preparation ways, may essentially influence the metal uptake and iron metabolism in plants. Mössbauer spectroscopy was found to be a valuable tool for distinguishing phase composition, oxidation state characterisation of iron oxide/oxyhydroxide nanoparticles synthesized under different preparation conditions.
    In the present study, nanomagnetites were prepared, first, under inert atmosphere via chemical co-precipitation method (from FeCl3•6H2O and FeSO4•7 H2O) with ammonia stabilization. After the reaction was completed, citric acid, dissolved in deionised water, was added. Then the products were filtered off and washed several times with deionized water. Solid samples were obtained by liophylization. XRD of the un-washed liophylized sample showed mainly reflections of ammonium-citrate, ammonium-chloride, ammonium-sulfate and iron sulfate phases besides those of 6 lines ferrihydrite, while 6 lines ferrihydrite was basically found in the case of the washed liophylized citric acid treated sample. 57Fe Mössbauer spectrum of un-washed and lyophilized sample indicated the presence of a small amount of iron(II) which disappeared when the sample was washed before lyophilisation. The 80 K spectrum of washed and lyophilized sample can be well assigned to 6 lines ferrihydrite. The existence of ferrihydrite is also confirmed by the results of HRTEM image. The formation of ferrihydrite from co-precipitated nanomagnetite in citric acid solution is not straightforward since one can expect rather citric acid coated nanomagnetite/nanomaghemite under similar conditions. Thus, we have succeeded to find a new production way of ferrihydrite.
    The mechanism of the formation of ferrihydrite from co-precipitated nano iron oxides in the presence of citric acid under the applied preparation conditions will be discussed.
    Selected ferrihydrite samples were tested on cucumber as for potential nutrition sources. They were approved to be effective in regenerating iron deficiency symptoms.
  3. Mössbauer spectroscopic study of some novel diglyoxime and triglyoxime complexes of iron(II)
    Author(s): Ernö Kuzmann, Cs. Várhelyi Jr., Z. Homonnay , R. Szalay, Gy. Pokol, S.. Kubuki et al.
    Institution: Eötvös University, Institute of Chemistry, Budapest, Hungary
    Abstract: Dioximes have been used as general industrial chemicals. As ligands, they are used as analytical reagents and serve as models for biological systems as well as catalysts in chemical processes. The C=N linkage in azomethine derivatives, is essential for biological activity, hence several azomethines were reported to possess remarkable antibacterial, antifungal, anticancer and diuretic activities. A number of novel mixed complexes of the type [Fe(DioxH)2(amine)2] (DioxH2 = glyoxime, and H-subsituted versions like dimethylglyoxime, methylethylglyoxime and benzylmethylglyoxime, amine = imidazole, benzimidazole, 2-methylimidazole, β- and γ-picoline, pyridine, p-toluidine, p-Cl-aniline, α-naphthylamine) have been prepared and characterised by FTIR, 57Fe Mössbauer and mass spectroscopy by us. We have found strong Fe–N donor acceptor interactions and iron occurred in low-spin FeII state in all complexes. Later, we have also found that the incorporation of branching alkyl chains (isopropyl) in the complexes alters the Fe–N bond length and results in high-spin iron(II) state. The questions arises: can the spin state of iron be manipulated generally by replacing the short alkyl chains with high volume demand ones in Fe-azomethine-amine complexes? To answer the question we have synthetized novel iron-bis-glioxime and iron-tris-gloxime complexes when long chain alkyl or aromatic ligands replaced the short alkyl ones and studied by 57Fe Mössbauer spectroscopy, MS, FTIR, UV-VIS, TG-DTA-DTG and XRD methods.
    Novel iron diglyoxime and triglyoxime complexes with composition of [Fe(diethyl-Diox)3(BOH)2], [Fe(diethyl-Diox)3(BOEt)2] and [Fe(phenyl-Me-Diox)3(BOEt)2], were synthesized similarly as described by us earlier. The FTIR, UV-VIS, TG-DTA-DTG and MS measurements indicated that the expected novel complexes could be successfully synthesized.
    57Fe Mössbauer spectroscopy revealed that iron is in low spin iron(II) state in all complexes. The results can be discussed in terms that the incorporation of relative high volume demand long alkyl chains or aromatic rings in the iron triglyoximes can have enough room in the molecule not to alter the Fe–N interatomic distances to be critical for appearance of high spin iron(II) state.
  4. Synthesis of local catalysts and there application for catalytic conversion
    Author(s): BENTAHAR Nourredine, A. Saoud and M.Mansour
    Institution: M'hamed Bougara University, Boumedes
    Abstract: Solid catalysts for petroleum refining and catalytic transformations have been developed starting from local Algerian materials, mainly “bentonite“. These catalysts are used for the transformation of the heavy fractions and the residues of the oil by the catalytic processes leading to obtaining clean and environmentally friendly petrol (fuel) as well as petroleum fractions that are considered as important raw materials for petrochemical, pharmaceutical, and cosmetic industry. The preparation of modified catalysts using Algerian local bentonite enriched by oxides to give them a better performance for the validation of certain fractions of oil and condensate is described.

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