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 108 for “"ADSORPTION-DESORPTION"”.
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Copper adsorption/desorption characteristics on copper amended soils
… Most organically bound Cu was held by specific adsorption mechanisms and Mehlich-3 strongly extracts this fraction. Mehlich-3 extraction patterns were indicative of Cu binding strength in the different soils. Since Mehlich-3 strongly extracts specifically bound Cu and only poorly removes oxide …
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Transport and adsorption-desorption of heavy metals in different soils
… were performed to assess the sorption-desorption and mobility of Cd, Cu, Pb, and Sn in alkaline and acidic soils. Furthermore, sequential extractions were accomplished to examine their behavior in soils. Also, the competitive reactivity of Sn and Pb in two acidic soils was quantified. …
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The reaction of molecular fluorine with silicon(100) : adsorption, desorption, and scattering dynamics
Thesis: Ph. D., Massachusetts Institute of Technology, Department of Chemistry, 1990
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Adsorption–Desorption Reactions in the Weathering Zone: Implications for Silicate Weathering & the Carbon Cycle
… the experiments aimed to elucidate the role of adsorption-desorption reactions in controlling the transport of fluid-mobile elements in rivers and estuaries. Additionally, stable barium isotope ratios were explored as potential tracers of terrestrial weathering and erosion processes. A …
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Molecular design of interfacial modifications to alter adsorption/desorption equilibria at fluid-adjoining interfaces
The thermodynamics and mass transfer kinetics of adsorption and desporption at interfaces play vital roles in chemical analysis, separation processes, and many natural phenomena. In this work, computer simulations were used to design interfacial modifications to alter the physical processes of …
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Adsorption/Desorption Process of Stimuli-Responsive Polymers on Simulated Natural Surfaces Using QCM-D & AFM Analysis
<p>The stimuli-responsive adsorption of polyelectrolytes to biosurfaces provides an important vehicle for development of protective coatings, delivery of therapeutic agents, and cosmetic applications. Developing a fundamental understanding of the mechanisms and kinetics of adsorption/desorption …
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CYCLIC SEQUENTIAL ADSORPTION DESORPTION/THERMAL-CATALYTIC OXIDATION OF VOLATILE ORGANIC COMPOUNDS: MATERIAL DEVELOPMENT, PROCESS ADVANCEMENT/IMPROVEMENT, AND NUMERICAL MODELING, SIMULATION AND OPTIMIZATION
… advanced abatement methods, e.g., sequential adsorption desorption/thermal-catalytic oxidation process. The overall goal of this research was to abate dilute streams of VOCs via the process. The specific objectives were to 1) develop novel adsorbent/catalyst dual-function materials (DFMs) for …
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A TEST METHODOLOGY FOR MEASURING GASEOUS CONTAMINANT TRANSFER IN ENERGY WHEELS
… methodology for measuring the contribution of adsorption/desorption to gaseous contaminant transfer in energy wheels. Furthermore, most of the studies lacked a rigorous uncertainty analysis. Analysis of the data in the literature revealed that the energy wheel design parameters such as face …
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Comsol Modelling of Uniform Corrosion of Used Nuclear Fuel Canisters
… process taking into account processes including adsorption/desorption, precipitation/dissolution, oxidation, and parameters including oxygen concentration, chloride, moisture and associated rate constants. In this work, CCM has been incorporated in COMSOL and validated with CCM. Once validated, …
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Structure and dynamics of adsorbed polymer
… segment-surface interaction enthalpy, and adsorption-desorption kinetics were made using Fourier transform infrared spectroscopy in the mode of attenuated total reflection. The polymers were amorphous, linear and flexible.
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ATR-FTIR Measurements of Cationic Surfactant Exchange Rates at the Solid-Liquid Interface
In many experiments, surfactant adsorption and desorption at solid-liquid interfaces is found to be quite slow, considering that surfactants are small molecules. Attenuated total reflectance Fourier transform infrared spectroscopy was used to study the adsorption, desorption, and exchange of …
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Desorption Kinetics of Lead from Goethite: Effect of Mixing and Sorption Period
… of trace metals is primarily controlled by adsorption-desorption reactions at the mineral-water interface. While many studies have been conducted to understand the adsorption of trace metals to soil minerals, less is known about long-term adsorption/desorption processes. In this study, we …
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Flow Mechanisms and Transient Pressure Analysis Study For Multi-Stage Fractured Horizontal Wells In Shale Gas Reservoirs
… and the comprehensive consideration of adsorption, desorption and diffusion in the seepage model, especially in the linear flow model, is rarely given. Comprehensive consideration of adsorption, desorption and diffusion, using computer programming knowledge, such as shale gas reservoir …
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Modelling of transport processes involved in service life prediction of concrete: important principles
… reactive (e.g. carbonation and chemical-physical adsorption-desorption) matter in the pore solution and in the air-filled space in the pore system of the material. The governing equations describing the variation of concentrations of different substances and temperature within the material will …
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Oxidation of Microplastics: Evidenced by Spectroscopy, Hydrophilicity, and Heavy Metal Uptake
… used; the microplastics were put through an adsorption/desorption protocol with the heavy metal lead (Pb). The ICP-OES was used to quantify the adsorption/desorption of lead on the weathered microplastics. Polyethylene microbeads weathered via chemical weathering successfully adsorbed and …
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Implications of Diversity: A Study of the Evolution of the Adsorption States of Macromolecules at Surfaces
We study the adsorption of macromolecules from solution onto single solid surfaces, focusing on the evolution of compositional heterogeneity of the layer. The origin and development of adsorption states within the physisorbed layer is noted in both chemically homogeneous and heterogeneous layers …
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Disposal of Bituminized and Other Low- and Medium-Level Wastes: Waste Characterization and the Retention of Migrating Radionuclides by Steel Corrosion Products
… quantitatively. Traditional and non-traditional adsorption/desorption experiments on steel corrosion products using 0.01-M NaCl and 0.001-M NaCl solutions with two different concentrations of Sr were performed including one system with slow flow. Langmuir and Freundlich adsorption isotherms were …
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Mechanisms and kinetics of silicon atomic-layer epitaxy on silicon(001)2x1 and germanium(001)2x1
… A film growth model, based upon the results of adsorption/desorption measurements, film growth experiments, and Monte Carlo simulations, is used to describe the reaction pathway for the process.
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Growth and Behaviors of InN/GaN Multiple Quantum Wells by Plasma-Assisted Molecular Beam Epitaxy
… with surface atomic processes such as the adsorption/desorption of metal species, the growth process was successfully monitored in situ. Also, at the high growth temperature, RHEED was successfully used to study the adsorption/desorption kinetics of indium surface coverage to gain knowledge …
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