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Kristalizacija zeolita Beta modificiranega z majhno količino titana
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Crystallization of Ti-modified zeolite Beta
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februarja 2006 s strani Ministrstva za visoko šolstvo, znanost in tehnologijo Republike Slovenije, Urad RS za meroslovje, imenovan za nosilca etalona v okviru nacionalnega etalona enote za množino snovi, področje varovanje okolja, vrsta vzorca odpadne in površinske vode.
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National institute of Chemistry, Laboratory for Chemistry, Biology and Technology of Water was on February 13, 2006 notified by Ministry of Higher Education, Science and Technology, Metrological Institute of the Republic of Sloveniaas, as holder of the standard in the scope of the national standard for the unit mol, area protection of environment, type of samples waste water and surface water. ( Link )
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Slika 1: Shematski prikaz topologije G-kvadrupleksa, ki ga tvori zaporedje d[G3TG3T4G3T3G3], katerega zvitje je bila regulirano z razporeditvijo sin (zasenčeni kvadrati) in anti (črni kvadrati) konformacij gvanozinov in z dolžino in posledično vrsto zank (v modri, rdeči in zeleni barvi).
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Figure 1: Schematic representation of topology of the G-quadruplex adopted by d[G3TG3T4G3T3G3] which was controlled through disposition of syn (shaded squares) and anti (black squares) conformations of guanine nucleotides and by the length and types of connecting loops (in blue, red and green). In NOESY spectrum (at mixing time 300 ms in H2O at 278 K) there are five most intense signals corresponding to residues 1, 5, 12, 13 and 18 being in syn conformation. Sequential correlations are indicated with black lines.
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Titan se vgrajuje v silikatno ogrodje od samega začetka sinteze in je torej prisoten tudi v sekundarnih nanodelcih. Ker imajo slednji zelo veliko zunanjo površino, so lahko izjemno učinkoviti katalizatorji.
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Eventhough zeolites have been extensively employed as very efficient catalysts over the last decades, their crystallization is still not well understood. In the paper that was published in Chemistry of Materials crystallization of zeolite Beta from viscous gel and incorporation of titanium into its framework were discussed. Investigation by NMR and XAS showed that during first 20 hours of the hydrothermal treatment oligomers aggregated into nanoparticles with the diameter of about 2 nm. After approximately 24 hours the primary nanoparticles began to agglomerate into secondary nanoparticles with the diameter between 5 and 10 nm. These nanoparticles already possessed a zeolitic character. Ti atoms were incorporated into the growing silicate framework at a very early stage of the crystallization and were thus also present in the secondary nanoparticles. Because of very large external surfaces, these secondary nanoparticles could make extremely efficient catalysts.
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Problem smo rešili tako, da smo sintetizirali ionsko tekočino (1-metil-3-[3-(trimetoksi-l4-silil)propil]imidazolijev jodid), ki je imela na imidazolijevem kationu pripete trietoksi skupine, ki so omogočile,da ionska tekočina kondenzira v kvazi trdno stanje [B. Orel et al., Electrochem. Commun. 7, 692 (2005); V. Jovanovski et al., J. Phys. Chem. B 109, 14387 (2005); B. Orel et al., J. Nanosci. Nanotehnol. (in press)].
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Ionic liquids attracted interest worldwide in the last few years mainly because of their negligible vapour pressure, low toxicity and ability to conduct various ions, which open their applications as electrolytes for various electrochemical devices (batteries and DSPEC cells). We succeeded to prepare an ionic liquid showing self-condensation properties, avoiding the leakage problems encountered with the ordinary ionic liquids. The condensation of the ionic liquid was achieved by making 1-methyl-3-[3-(trimethoxy-l4-silyl)propyl]imidazolium iodide, characterized by the trialkoxysilane groups enabling the sol-gel reactions, which led to the formation of positively charged silsesquixane condensation products having an open polyhedra structure (POSS) [B. Orel et al., Electrochem. Commun. 7, 692 (2005); V. Jovanovski et al., J. Phys. Chem. B 109, 14387 (2005); B. Orel et al., J. Nanosci. Nanotehnol. (in press)].
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S strukturno karakterizacijo materiala z rentgensko absorpcijsko spektroskopijo in katalitskimi testi smo dokazali, da so visoko aktivni le nanodelci, ki vsebujejo v silikatno ogrodje vgrajen mangan, ne pa nanodelci, v katerih je mangan prisoten v obliki oksidov (Mn3O4 ali Mn2O3). Material predstavlja novo družino katalizatorjev za AOP procese, ki razgrajujejo organska onesnažila v vodi.
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Wet hydrogen peroxide catalytic oxidation (WHPCO) is one of the most promising industrially applicable advanced oxidation processes (AOPs) for the decomposition of organic pollutants in water. Researchers from Laboratory for Inorganic Chemistry and Technology (L09) in collaboration with researches from Laboratory for Environmental Sciences and Engeenering (L05) and a researcher from University of Nova Gorica designed a novel and environmentally friendly, cost-effective as well as highly efficient catalyst for catalytic wastewater purification. The discovery was published in the journal Advanced Functional Materials. Researchers demonstrated for the first time that manganese functionalized silicate nanoparticles act as a superior catalyst in WHPCO, since they can completely decompose and convert to carbon dioxide 80 % of a test organic compound in 30 minutes at neutral pH and room temperature. By performing structural characterization of the material using X-ray absorption spectroscopic techniques and catalytic tests, it was also proven that the superior activity of the catalyst can be attributed uniquely to the manganese incorporated into silicate framework of nanoparticles, and not to manganese in the form of manganese oxides (Mn3O4, Mn2O3). The presented material thus introduces a new family of catalysts, which possess superior efficiency for the decomposition of organic pollutants dissolved in water.