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Wyszukujesz frazę "metal organic framework" wg kryterium: Temat


Wyświetlanie 1-4 z 4
Tytuł:
Synteza związków metaloorganicznych jako efektywnych sorbentów ditlenku węgla
Synthesis of metal-organic framework structures as effective carbon dioxide sorbents
Autorzy:
Bieniek, J
Majchrzak, A
Majchrzak-Kucęba, I
Powiązania:
https://bibliotekanauki.pl/articles/296867.pdf
Data publikacji:
2012
Wydawca:
Politechnika Częstochowska. Wydawnictwo Politechniki Częstochowskiej
Tematy:
adsorpcja
separacja ditlenku węgla
struktury metaloorganiczne
adsorption
carbon dioxide separation
metal-organic framework structures
Opis:
W niniejszym artykule przedstawiono wstępne doświadczenia z badań innowacyjnej grupy stałych materiałów porowatych - struktur metaloorganicznych (MOF), mogących znaleźć zastosowanie w adsorpcyjnym wychwycie i separacji ditlenku węgla. Przedstawiono syntezę kilku struktur: MOF-5, MOF-199, Zn-MOF-74, Mg-MOF-74, Ni2(BDC)2(Dabco), Zn2(BDC)2(Dabco) oraz Mg2(BDC)2(Dabco). Pierwsze dwa z nich zbudowane są z trójwymiarowego szkieletu sześciennych cząsteczek metaloorganicznych, kolejne dwa charakteryzują się dwuwymiarową strukturą, natomiast ostatnie trzy przypominają modyfikowane glinokrzemiany warstwowe. Zaprezentowano wyniki analiz stabilności termicznych otrzymanych próbek oraz wyznaczono metodą termograwimetryczną ich pojemności sorpcyjne względem CO2 w temperaturze 25°C w ciśnieniu atmosferycznym.
In the presented article were shown preliminary experiences in building a research base in the subject of innovative porous materials - metal-organic framework structures (MOFs). These materials can be applicable in adsorptive capture and separation of carbon dioxide. These structures are hybrids of metals or metal building units and organic ligands as linkers. Within the article there were presented and conducted reconstructive procedures of synthesis of several MOFs. MOF-5 is composed of zinc acetate molecules connected with terephtalate ligands in cubic macroparticles which create a 3D porous structure. MOF-199 shows quite similar construction with exception of replacement of terephtalate linker by benzenetricarboxylate ligand. Zn-MOF-74 and Mg-MOF-74 present a 2D structure appearing as tunnels built by connecting metals with dihyroxytereftalate ligand. Last synthesized group of MOFs is Me2(BDC)2Dabco, where Me is Ni, Zn or Mg. Structure of these materials is similar to pillared clays (such as bentonites), with layers constructed by metals and terephtalic acid ligands which are pillared by molecules of diazabicyclooctane. Within the article were presented results of thermal stability of synthesized samples, in order to determine its suitability to the technological processes. The most important part of this paper is determination of adsorption capacities of synthesized samples relative to the carbon dioxide as an adsorbate in temperature of 25°C and at atmospheric pressure.
Źródło:
Inżynieria i Ochrona Środowiska; 2012, 15, 4; 427-439
1505-3695
2391-7253
Pojawia się w:
Inżynieria i Ochrona Środowiska
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
PET-MOF-CLEANWATER wspólny projekt Polska – Republika Południowej Afryki
PET-MOF-CLEANWATER Joint Poland – South Africa Project
Autorzy:
Sartowska, Bożena
Powiązania:
https://bibliotekanauki.pl/articles/214248.pdf
Data publikacji:
2020
Wydawca:
Instytut Chemii i Techniki Jądrowej
Tematy:
PET – Polyethylene terephthalate
MOF – Metal Organic Framework
kwas tereftalowy
usuwanie szkodliwych
pierwiastków z wody
terephthalic acid
hazardous elements removal
from water solutions
Opis:
Celem projektu PET-MOF-CLEANWATER jest wytworzenie nowych zaawansowanych materiałów adsorpcyjnych na bazie porowatych metaloorganicznych polimerów koordynacyjnych (sorbenty typu MOF) z wykorzystaniem odpadów PET jako surowca do pozyskania liganda tereftalowego. Uzyskano pozytywne wyniki badań laboratoryjnych. Prowadzone są prace dla wykazania przydatności materiałów sorpcyjnych produkowanych z wykorzystaniem odpadowego PET do usuwania szkodliwych pierwiastków z roztworów wodnych.
The aim of PET-MOF-CLEANWATER project is to produce new advance sorption materials on the base of porous metaloorganic coordinated polymers (sorbents MOF type) with using terephtalic linker recovered from waste PET. The positive results of laboratory investigations were obtained. Works for removal of the hazardous elelements removal from water solutions using sorption materials formed from waste PET are carried out.
Źródło:
Postępy Techniki Jądrowej; 2020, 2; 31-34
0551-6846
Pojawia się w:
Postępy Techniki Jądrowej
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Struktura i właściwości fizykochemiczne polimerów koordynacyjnych oraz materiałów typu MOF kadmu(II) i cynku(II)
Structure and physicochemical properties of coordination polymers and MOF materials based on cadmium(II) and zinc(II)
Autorzy:
Pobłocki, Kacper
Drzeżdżon, Joanna
Jacewicz, Dagmara
Powiązania:
https://bibliotekanauki.pl/articles/1413238.pdf
Data publikacji:
2021
Wydawca:
Polskie Towarzystwo Chemiczne
Tematy:
polimery koordynacyjne
sieci metaliczno-organiczne
związki kadmu(II)
związki cynku(II)
MOF
coordination polymer
metal organic framework
cadmium(II)
compounds
zinc(II) compounds
Opis:
In 1964, J.C. Bailat Jr. was one of the first scientists who use coordination polymers in his research. He established the rules of structure and the composition of compounds containing metal ions and organic ligands connected by coordination bonds to form layered or chain structures. He compared inorganic compounds belonging to polymeric species with organic polymers. The term Metal Organic Frameworks (MOF) was first used in the publication by О. M. Yaghia. Crystalline, microporous structures contain rigid organic ligands (used interchangeably: organic building blocks) that bind metal ions. This is called reticular synthesis. MOF surface area values usually range from 1000 to 10000 m2/g-1, thus exceeding the area values of traditional porous materials such as zeolites and carbons. Metal Organic Frameworks create porous three-dimensional structures, unlike coordination polymers. Inorganic minerals from the aluminosilicate group are used in the widespread heterogeneous catalysis and processes such as: adsorption and ion exchange, while compared to Metal Organic Frameworks, shows a lower potential than zeolites, moreover, the design of structures is less precise and rational due to the lack of shape, size and control functionalization of pores. To date, MOF are the most diverse and most numerous class of porous materials. All aspects have made them ideal structures for storing fuels such as hydrogen and methane. They are perfect for catalytic reactions and are good materials for capturing pollutants, e.g. CO2. The number of publications on coordination polymers (CP), Metal Organic Frameworks (MOF) or a group of hybrid compounds (organic-inorganic) increased tenfold at the turn of 2005, which proves the growing interest in this field by scientists around the world. MOF diversity in terms of structure, size, geometry, functionality and flexibility of MOF has led to the study of over 20,000 different MOF’s over the past decade. The search for new materials consists of combining molecular building blocks with the desired physicochemical properties. To produce a solid, porous material that can be used in the construction of a "molecular scaffold", rigid organic moieties, which are described in the literature as rods, must be combined with multi-core, inelastic inorganic clusters that act as joints (also called SBU secondary building units). By design, multi-core cluster nodes are able to impart thermodynamic stability through strong covalent bonds and mechanical stability due to coordination bonds that can stabilize the position of metals in the molecule. This property contrasts with those of the unstable single coordination polymers. The size and most importantly the chemical environment of the resulting voids are determined by the length and functions of the organic unit. Therefore, adjusting the appropriate properties of the material is made by appropriate selection of the starting materials. The isoretical method made it possible to use MOF structures with large pores (98 Á and low densities (0.13 g/cm3). This method involves changing the size and nature of Metal Organic Frameworks without changing the topology of their substrate. Thanks to this, it was possible to include large molecules such as vitamins (e.g. B12) or proteins (e.g. green fluorescence protein) into their structure and use the pores as reaction vessels. The thermal and chemical stability of many MOFs has made them amenable to functionalization by post-synthetic covalent organic complexes with metals. These properties make it possible to significantly improve gas storage in MOF structures and have led to their extensive research into the catalysis of organic reactions, activation of small molecules such as hydrogen, methane and water, gas separation, biomedical imaging and conductivity. Currently, methods of producing nanocrystals and MOF super crystals for their incorporation into specialized devices are being developed. Crystalline structures of MOF’s are formed by creating strong bonds between inorganic and organic units. Careful selection of MOF components produces crystals of giant porosity, high thermal and chemical stability. These features allow the interior of the MOF to be chemically altered to separate and store gases. The uniqueness of MOF materials is that they are the only solids to modify and increase the particle size without changing the substrate topology.
Źródło:
Wiadomości Chemiczne; 2021, 75, 7-8; 1041-1073
0043-5104
2300-0295
Pojawia się w:
Wiadomości Chemiczne
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Zastosowanie polikarboksylanowych związków kompleksowych w tworzeniu sieci metaloorganicznych typu MOF
Application of polycarboxylate comlexes in the formation of metal-organic frameworks
Autorzy:
Zych, Dominika
Drzeżdżon, Joanna
Jacewicz, Dagmara
Chmurzyński, Lech
Powiązania:
https://bibliotekanauki.pl/articles/171746.pdf
Data publikacji:
2019
Wydawca:
Polskie Towarzystwo Chemiczne
Tematy:
związki metaloorganiczne typu MOF
trójwymiarowa struktura
fizykochemiczne właściwości związków typu MOF
zastosowanie związków typu MOF
Metal–Organic Frameworks
MOF
three-dimensional framework structure
physicochemical properties of MOF
applications MOFs
Opis:
The first research on Coordination Polymers began at the beginning of the 20th century. Wider understanding of their structure has enabled the development of crystallography. Since then compounds, which belong to this group, have been the subject of broad-spectrum scientific research. A particular class of these compounds, known relatively recently, are Metal–Organic Frameworks (MOF). The MOF structure is based on negatively charged organic linkers, e.g. polycarboxylic anions connected to various metal cations or metal clusters. MOFs are mainly built up from metal cations: transition, alkaline earth, main groups of the periodic table, as well as rare earth metals. Moreover, organic ligands used in the construction of MOF materials should contain electron donors. A characteristic bond, that allows the formation of hybrids, through the interactions of nodes and bridges is the coordination bond. It allows to synthesize a three-dimensional framework structure. Modern synthesis leads to the generation of porous materials with a very large surface area of pores and unique properties. Considering their synthesis, crystalline structures and physicochemical properties of MOF, as well as broad MOFs applications including gas storage, separation, catalysts, luminescence, magnetism and others, it is reasonable to state that MOFs can be used in many areas, not only in science, but also in environmental protection and in industry, for example, energy industry, chemical and biochemical industry.
Źródło:
Wiadomości Chemiczne; 2019, 73, 5-6; 401-423
0043-5104
2300-0295
Pojawia się w:
Wiadomości Chemiczne
Dostawca treści:
Biblioteka Nauki
Artykuł
    Wyświetlanie 1-4 z 4

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