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 39 for “"ADSORPTION MECHANISM"”.
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Investigation of Chitosan-based Adsorbents for Water Treatment, Pollutant Detection, and Adsorption Mechanism
… Among various approaches to remove contaminants, adsorption-based techniques have been extensively studied as an efficient mode of pollutant removal from water due to their low cost, process flexibility, easy handling, and limited usage of secondary chemicals. The adverse health effect of these …
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Synthesis and characterisation of silica adsorption platforms for use in environmental remediation
… chromium (VI) from aqueous solution. A maximum adsorption capacity calculated using Langmuir isotherms of 111.1 mg g-1 was achieved, which was higher than previously reported for competitive sorbents. Moreover, adsorbents containing silica nanoparticles with different porosity parameters were …
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Characterization, Functionalization, and Adsorption Behavior of Single-Walled Carbon Nanotubes towards Bisphenol A and 17 Β- Estradiol
… carbon nanotubes (SWNTs) through the adsorption of representative endocrine disrupting compounds: bisphenol A (BPA) and 17 β-estradiol (E2). Initially, a protocol was developed to understand the effect of ultrasonication on the dispersion of SWNTs in water. The results of adsorption …
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Halogen-induced modification of silicon surfaces: etching roughening, and step transformations
… of halogen supersaturation. I present a novel adsorption mechanism that is accessed upon exposing nearly-saturated Cl-Si(100)-(2x1) to a flux of Cl2, whereby dangling bonds of the nearly-saturated surface mediate the insertion of Cl adsorbates into non-equilibrium adsorption sites. The …
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Kinetic studies of the reaction of gallium arsenide with molecular chlorine and iodine
… to be consistent with a "reversible dissociative adsorption" mechanism proposed in earlier studies of the Cl₂ and Br₂ etching of silicon. This mechanism involves the physisorption of the halogen molecule on the semiconductor surface followed by the dissociation of the molecule into chemisorbed …
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Computational and adsorption investigation of some quinoxaline derivatives on selected metals in acidic media
… inhibition characteristics including corrosion mechanism, corrosion inhibition efficiencies, and inhibitor-metal adsorption/desorption behavior were analyzed using gravimetric analysis, electrochemical impedance spectroscopy (EIS), and potentiodynamic polarization (PDP). Fourier transform …
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Nanocellulose-based materials for sustainable soil remediation and water purification
… CNC-based materials, characterization of their adsorption behaviors, evaluation of CNC-mediated algal toxicity, and exploration of the application of the these materials in sustainable soil remediation and water purification. In the first part, the utilization of CNC nanofluid as an eco-friendly …
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Preparation and Evaluation of Sulfur -Containing Adsorbents for Removal of Mercury From Simulated Coal Combustion Flue Gases
… the adsorbents' Hg0 and HgCl2 equilibrium adsorption capacities. Results indicate that low-cost, high-capacity adsorbents (e.g., CDACs) can be developed from precursors containing inherent sulfur (e.g., coal). The resulting samples, without using sulfur impregnation, achieved mercury …
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Development of a semi–empirical reaction kinetic model for PEM fuel cells
… ORR, a fundamental understanding of the reaction mechanism and the manner in which it proceeds under different operatingconditions is required. Presently, there still remains a large debate in literature around the mechanism followed by the ORR.This study developed a kinetic model from …
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An Integrative Approach to Evaluating Radiocesium Contamination in Fukushima Prefecture
… to be the most abundant. Research has shown that adsorption of K<sup>+</sup> and Cs<sup>+</sup> on 2:1 clay minerals can collapse the interlayers, causing the adsorbed ion to become non-exchangeable. This thesis takes an integrative approach to the restoration of radiocesium-contaminated soil in …
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Desiccant dehumidification analysis
… less energy consumption. As the first step, the adsorption mechanism is explored and desiccant material properties are obtained based on a literature review. The heat and mass transfer in the desiccant - moist air system is well understood and modeled using both pseudo-gas-side controlled (PGC) …
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On-line liquid distribution chromatographic/spectrofluorometric determination of PAH distribution in coal-derived products
… a charge-transfer active phase. The retention mechanism of aromatic hydrocarbons on the picramido bonded phase column was studied in three ways: electronic effects (Hammett cr function); temperature effects on heats of adsorption and solvent effects on capacity factors. Chromatographic …
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Sulfur-Based Yolk-Shell Nanoparticles for Lithium Sulfur Batteries
… can interact with polysulfide species through an adsorption mechanism, preventing their dissolution in the electrolyte and diffusion onto the Li anode. In a different study, we provide a template to synthesize various TiO2 nanoshells. All of the targeted nanoparticles reported herein were …
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Environmental dynamics of Benomyl and Thiabendazole
… 53 and 27% translocated into corn plants. The adsorption mechanism/s of these fungicides onto soil components were investigated using silty clay loam, silty loam and sandy soils as well as Ca-bentonite. These studies indicated that both fungicides were adsorbed to the highest degree on silty …
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The interaction of metal ions at the hydrous manganese dioxide-solution interface
… improved our qualitative understanding of the adsorption mechanism and have also provided a means of testing quantitatively the proposal that the concentration of cobalt in manganese rich marine samples is due to adsorption of cobalt from sea water by hydrous manganese dioxide. This study has …
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Preparation and characterization of cross-linked chitosan beads for phosphate adsorption in aqueous solution
… chemical functionalities that affect the adsorption properties. The general features of the adsorption and textural properties of the bead systems were studied using model dye compounds such as p-nitrophenolate (PNP) and phenolphthalein (PHP). The results from the uptake study of the model …
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Temperature Programmed Desorption and Infrared Spectroscopic Studies of Interfacial Hydrogen Bonds for Small Molecules Adsorbed on Silica and Within Metal Organic Frameworks
… Our research investigated sulfur mustard (HD) adsorption by characterizing interfacial hydrogen bonding and dispersion forces for the simulant molecules 2-chloroethyl ethyl sulfide (2-CEES) and methyl salicylate on well-characterized hydroxyl-functionalized surfaces (silica and UiO-66). Our …
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The effects of molecular structures and reactant temperatures on soot formation in a coflow laminar flame
… Hydrogen-Abstraction-C2H2-Addition (HACA) mechanism. The importance of both mechanisms was highlighted by assessing the effect of naphthalene addition to both 1,2,4-trimethylbenzene and n-propylbenzene. It is found that naphthalene addition affects n-propylbenzene more than …
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Bacterial poly-gamma-Glutamic Acid (y-PGA) - a promising biosorbent of heavy metals
… of interfering metal ions could hinder the adsorption of individual metal ions by γ-PGA. The affinities of heavy metal ions for γ-PGA followed the order: Cu2+ > Zn2+ > Ni2+ > Cd2+. The effect of molecular weight of γ-PGA on metal removal was also investigated, and it was found that metal ion …
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Kinetic Study of the Catalytic Desorption of Carbon Dioxide (CO2) from CO2-Loaded Monoethanolamine (MEA) and Blended Monoethanolamine-Methyldiethanolamine (MEA-MDEA) during Post Combustion CO2 Capture from Industrial Flue Gases
… acid site ratio exhibited dual site adsorption mechanism and provided faster kinetics and higher conversions with lower activation energy in comparison with γ-Al2O3 for both solvents. Also, a statistical analysis using four catalysts, namely, HZSM-5, γ-Al2O3, silica-alumina and HY (of …
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