Global ETD Search
Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
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Showing 1 to 20 of 171 for “"sorbent"”.
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Sulphur sorbent particle effects in fluidised combustion
… for the capture of sulphur dioxide by calcareous sorbents in a fluidised bed combustor for a feed of arbitrary size distribution. The description of sorbent sulphation kinetics, particle attrition and elutriation effects incorporated in this model is supported by experimental data for a wide range …
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A Study of Heat and Mass Transfer in Porous Sorbent Particles
… arising in separation processes using porous sorbent particles. These particles are comprised of pore channels spanning length scales over almost three orders of magnitude while involving a variety of physical processes such as mass diffusion, heat transfer and surface adsorption-desorption. A …
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Silica Based Solid Phase Extraction Sorbent with a Removable Alkyltrimethylammonium Surfactant Phase
Presented is a solid phase extraction (SPE) sorbent having a removable "stationary phase." This removable phase that consists of alkyltrimethylammonium surfactant is initially immobilized onto hydrophilic strong cation exchange resin. The surfactant chain through hydrophobic interactions extracts …
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Commercialization of cryptomelane-type manganese oxide (OMS-2) nanowire paper oil sorbent
… type process to regenerate and recycle the sorbent for reuse. This translates into further differentiation and provides greater value for the users.
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Evaluation of polybenzimidazole as a selective metal sorbent and controlled release agent
Polybenzimidazole (PBI) is a high performance, high thermal stability, new generation polymer that has excellent resistance to acids, bases, organic solvents, and fuels. The imidazole functionality suggests, however, that PBI should exhibit strong affinity for certain metal ions, and could be …
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Flash calcination of limestone in a bench-scale sorbent activation process (SAP) unit
… pollutants from the flue gas is by injection of sorbents downstream of a boiler and up-stream of a particulate control device. Activated carbon (AC) is a suitable sorbent to capture vapor-phase mercury and calcium-based sorbents such as quicklime (CaO) and hydrated lime (Ca(OH)2) are suitable …
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System-level Design, Fabrication, and Optimization of Sorbent-based Atmospheric Water Harvesting Devices
… technologies are limited. However, current sorbent materials are often limited in their applicability due to system integration and device design constraints. In this thesis, we present advancement of atmospheric water harvesting technologies in both the passive and active design space by …
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Development of teawaste based bio-sorbent materials for removal of Cr(VI) from wastewater
… control. <br/><br/>In this research bio-sorbent materials for application in hexavalent chromium removal from waste water were produced and evaluated. The teawaste material was collected from local cafeteria. First, the teawaste material was mixed with bleach until the teawaste paste …
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Elucidation Of Chiral Recognition Mechanisms Of Solutes By Amylose Tris[(s)-Alpha-Methylbenzylcarbamate] Sorbent
… agrochemicals industries. Polysaccharide-based sorbents have been widely used in chiral liquid chromatography. The recognition mechanisms which determine their enantioselectivities are not completely understood.</p> <p>In this dissertation, the chiral recognition mechanisms of a widely used …
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Land Use Impacts of Plastic Mulch Tomato Production and Evaluation of Sorbent Control on Shellfish Hatchery Operations
… dissolved copper sorption capacities of eight sorbents, including GACs, zeolites, a greensand, and an ion exchange resin, Amberlite IRC-718. These isotherm studies showed that all sorbents removed soluble copper, and that increased salinity and a greater contact time were shown to increase …
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Strengths and limitations of bioretention sorbent amendments to simultaneously remove metals, PAHs, and nutrients from urban stormwater runoff
… In this study, the potential of five low-cost sorbents as BSM amendments – waste tire crumb rubber (WTCR), coconut coir fiber (CCF), blast furnace slag (BFS), biochar (BC) and iron coated biochar (FeBC) – were investigated for removing several classes of contaminants from simulated stormwater …
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Development of methodology for the use of multi-bed sorbent traps with gas chromatography time of flight mass spectrometry
… time. In this study, the utility of a multibed sorbent trap was explored for potential use as a preconcentration step in the analysis of volatile products of lipid peroxidation in biological systems. The trap was integrated into a fully-automated system in which samples are drawn to the trap via …
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Investigation of adsorbent-based warm carbon dioxide capture technology for IGCC system
… capital intensive contributing to the problem. Sorbent-based warm CO₂ capture has been predicted to be a key enabling technology for lowering down the costs of IGCC-CCS. However, no commercial adsorbents or processes exist for these warm CO₂ separations. My thesis work has been devoted to …
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Mercury methylation potentials in sediments an ancient cypress wetland using species-specific isotope dilution-GC-ICP-MS: Analytical method development and the effect of sorbent amendments
… amending sediment with ∼5% (wt/wt) of select sorbent materials. Activated carbon and bio-char decreased Hg methylation rates by 83% and 89%, respectively. Humic material increased rates by 455%, presumably by providing nutrients to the methylating microorganisms and increasing their activity. …
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Co2 Adsorption On Solid Sorbents
Sorbent-based CO2 capture technology is considered as one of the potential scientific techniques for mitigating greenhouse gas emission. Major advantages of sorbent based adsorption are its low regeneration energy coupled with the elimination of corrosion and equipment degradation characteristic of …
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Plastic Waste-Derived CO2 Sorbents and Methods for Enhanced Selectivity and Stability
… to reduce their carbon emissions. Solid sorbent technology has been touted as the most promising method to attain emissions reduction targets; however, many of these sorbents suffer drawbacks related to their cost, performance, or both. Due to these shortcomings, carbon capture solid …
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Applications of modifiers in supercritical fluid extraction and chromatography
… extraction have been evaluated in this work. Sorbent and solid phase traps were investigated with pure carbon dioxide in order to determine the effect of stationary phase identity, pretreatment, and rinse solvent on the recoveries of a test mixture of compounds of varying vapor pressure and …
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Mechanisms governing the abatement of metal emissions from waste incineration.
A naturally occurring sorbent, kaolinite, is injected into a down-flow pilot scale combustor burning natural gas, doped with a surrogate metal containing waste (usually lead acetate). When sorbent is not introduced, lead vaporized in the flame ultimately forms a unimodal particle size distribution …
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Nanocomposites for nitrogen oxide emissions control in lean-burn engines
… precipitation technique. These CuO-based sorbents possessed excellent SO₂ adsorption capacity and superior regenerability by CO compared to those produced by the impregnation method due to higher surface area and dispersion of Cu species. A gram of sorbent with 30 wt% Cu could adsorb over …
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Electrospun nanofibrous metal oxides as regenerable adsorbents for desulfurization of biomass-derived syngas
… suitably high temperatures. A solid-phase sulfur-sorbent material that has a high reactivity, good structural stability, and easy regenerability at such high temperatures can provide such an alternative. In past work, different bulk sorbents with different chemical and structural properties have …
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