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Showing 1 to 20 of 23 for “"Mesopore"”.
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Roles of Background Compound Molecular Size and Adsorbent Pore Size Distribution in Competitive Adsorption on Activated Carbon
… consisted of extensive secondary micropore and mesopore volumes, labeled as Pellet II, were evaluated for atrazine adsorption in the presence of CR in order to assess the role of PSD on competitive adsorption. The capacity for CR adsorption correlated well with pore volume between 13 and 350 A. …
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Characterization and fabrication of nanoporous materials by template directed sol-gel methods
… of 500 m2 g-1. It was further shown that the mesopore size could be tuned by choosing different surfactants and mesopore sizes ranging from 2-7 nm were produced.<br/>Finally, the synthetic procedures developed to produce meso/macro silica were used to produce meso/macro titania and zirconia by …
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Adsorption Thermodynamics and Mass Transfer of Toxic Volatile Organic Compounds in Activated -Carbon Fiber -Cloth for Air Pollution Control
… the classical thermodynamics and TEEA. Relative mesopore filling pressure was modeled by modifying the Kelvin equation. The Modified-Kelvin equation provided a convenient and reliable method to determine the mesopore size distribution of the adsorbent. Effective diffusivity of adsorbates into the …
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Preparation and characterization of mesoporous aluminosilicates from Ca-A zeolite
… pore size of the micropore-type zeolite into a mesopore type: (a) 0.2N HCl acid treatment at 80$\sp\circ$C from which the time of exposure to the acid medium has a great influence on the pore size distribution of the resulting materials. (b) A hydrothermal treatment followed by a mild acid …
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Nanostructured carbohydrate-derived carbonaceous materials
… system was found to direct pore size into the mesopore size domain (i.e. Type IV isotherm, SBET = 116 m2g-1, 60 % mesoporosity) generating pore size of ca. 4 nm. It is proposed that in both cases as HTC proceeds to generate a polyfuran-like network, the organised block copolymer micellular …
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Synthesis of anion exchange/activated carbon fiber hybrid materials for aqueous adsorption of toxic hexavalent chromium
… HACAX displays not only very high mesopore content with a surface area up to 1085 m2/g based on coating, but also good strong base ion exchange capacity up to 1.5 meq/gC and exceptionally fast kinetics due to multi-scale facilitated mass transfer. Compared with conventional …
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Mesoporous oxides as efficient catalysts for the electrocatalytic oxygen evolution reaction (OER)
… oxide coatings with high accessible ordered mesopore structure was achieved via evaporation induced self assembly. The synthesis succeeds by utilizing PEO-b-PB-b-PEO triblock copolymers as a pore template, a suitable metal oxide precursor, and a final heat treatment under air. The synthesis …
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Development of Mesoporous Silicas, Responsive Polymer Microgels, and Related Nanocomposites
… work on the synthesis of silicas with spherical mesopores. Chapter 2 is focused on the synthesis of large-pore FDU-12 silicas at room temperature by using surfactants with large hydrophilic blocks and relatively small hydrophobic blocks (such as Pluronic F108 (EO132PO50EO132)) as the template. …
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Fundamental Kinetic Studies of CO2 and Steam Gasification
… is held in an inert atmosphere reduces the char mesopore area, thereby reducing the char reactivity. As a result of the non-existence of a maximum gasification rate associated with changes in the char surface, kinetic modeling can be simplified. The active char surface area (based on its carbon …
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INVESTIGATIONS OF PREFERENTIAL AND MATRIX FLOW IN A MOLE DRAINED SOIL BLOCK
… specific flowpaths, namely macropores and mesopores, and the interaction between mobile and immobile zones within the soil. Two large soil blocks (1 m2 by 0.85 m) of the Hallsworth series were removed from the field and placed on sand tables so that a suction could be induced at the base of …
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Removal of Naphthenic Acid from Water Using Biomass-based Activated Carbon
… to the higher surface area and increased mesopore size. It was observed that both the chemically and physically activated carbons had greater naphthenic acid uptake than the commercially activated carbon. A removal range between 60-90% of total organic carbon (TOC) was achieved using ACs …
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Porosity control of alkali-activated aluminosilicates via functional alkoxysilane additives
… showed an order of magnitude decrease in mesopore volume, while compressive testing found a 48% increase in Weibull modulus for compressive strength and a probable increase in compressive strength. Mercury intrusion porosimetry measurements showed up to a 24% increase in bulk density. …
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Sudaki fenolik kirleticilerin farklı adsorplayıcılara adsorpsiyonu ve katının mikrodalga rejenerasyonu
… that regeneration the microwave improved the mesopore fraction of the solids. As conclusions, the activated carbon prepared from the biomasses may be reused by regeneration with microwave in removing phenol and para-nitrophenol (PNP) in water. Regeneration of the activated carbons with …
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Synthesis and Characterisation of Electron Conducting Mesoporous ti and ta Oxide for Use as Potential Electrode Materials in Lithium Ion Batteries
… Ti-O units with Ti-S at the surface of the mesopore channels to reduce the band gap between the valance band and the conduction band, increasing the conductivity while retaining the porosity and thermal stability. Lower temperatures generally yielded materials with superior properties and …
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Nanostructured Porous High Surface Area Ceramics for Catalytic Applications
… surface areas between 410 and 830 m2g-1 and high mesopore volume (up to 0.9 cm3g-1). The pore size (between 3 and 7nm in diameter) and surface area of mesoporous silicon carbide were controlled by adjusting the infiltration conditions (time, atmosphere). The mesoporous silicon carbide prepared via …
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Materials with engineered mesoporosity for programmed mass transport
… mass transport of small molecules through the mesopores. Discussion will then shift of exploration of cation exchange and electroless plating of metals to alter the mesoporous hollow sphere (MHS) materials and properties. The focus of discussion will then shift to the transport of ions into and …
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Fabrication of carbon-based nanomaterials for energy conversion
… its high surface area, high pore volume, narrow mesopore size distribution, high conductivity and high nitrogen content. In the second part, carbon-based composites co-doped with nitrogen and trace amount of metallic cobalt have been developed as electrocatalysts for water splitting system at low …
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Inclusion of Molybdenum into microporous and mesoporous materials
Transition metal supported catalysts have important value in industry and their developments continue to attract interest in research. Considering the importance of metal and metal oxide supported catalysts, this study focused on the development of molybdenum and molybdenum oxide supported …
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Block Copolymer Derived Porous Carbon Fiber for Energy and Environmental Science
… when electrospun and develop narrowly disperse mesopores upon carbonization. The PMMA and PAN domains self-assemble in a kinetically trapped disordered network whereby PMMA decomposes and PAN cross-links into PCF. The initial investigation highlights the block copolymer molecular weight and …
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Activated Carbon Preparation and Modification for Adsorption
… (BET) surface area, micropore, mesopore and total pore volume of AC. Although the pore structure and specific surface area were greatly improved after hydrothermal oxidization with 4 M HNO<sub>3</sub>, the increased oxygen on the surface of AC decreased the dynamic adsorption …
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