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.
Results
Showing 1 to 20 of 50 for “"competitive adsorption"”.
-
Competitive Adsorption of Arsenite and Silicic Acid on Goethite
The adsorption behavior of silicic acid and arsenite alone and competitively on goethite over a broad pH range (3-11) at environmentally relevant concentrations was investigated utilizing pH adsorption data and zeta potential measurements. Both addition scenarios (Si before As(III) and As(III) …
-
Competitive Adsorption of Organic Compounds From Aqueous Systems Using Active-Carbon
Made available in DSpace on 2014-12-17T21:05:00Z (GMT). No. of bitstreams: 1 7317259.pdf: 3526198 bytes, checksum: 68c2e150425de9c7c401dfac0c90d7cf (MD5) Previous issue date: 1972
-
The Role of Pore Size Distribution in Competitive Adsorption on Activated Carbon
Based on these competitive adsorption mechanisms it was proposed that in order to minimize the impact of NOM on micropollutant adsorption capacity and adsorption kinetics, the adsorbent must have a wide range of micropore sizes, including pores of similar size to the target compound.
-
Competitive Adsorption of Trace Organic Compounds by PAC in Membrane Filtration Systems
A three-component kinetic adsorption model was developed to describe competitive adsorption of a trace organic compound in the presence of NOM. NOM was simplified into two fractions: a strongly competing fraction that directly competes for adsorption sites, and a large, pore blocking fraction that …
-
Dynamics of liquids in porous media: Investigating competitive adsorption using NMR relaxometry
… of NMR relaxometry methods to investigate competitive adsorption and microphase separation of liquid mixtures imbibed within porous media. The work was done on three different mesoporous catalysts and catalyst supports, namely anatase titania, γ-alumina and silica. The main NMR relaxometry …
-
Individual and competitive adsorption of MSMA and phosphate onto iron and non-iron soil
… the properties. This research investigated the adsorption of MSMA (V) of soil samples collected at the USDA-ARS Dale Bumpers National Rice Research Center located near Stuttgart, Arkansas. Batch experiments were performed to evaluate the effect of Fe, phosphate, and pH conditions on MSMA (V) …
-
Simultaneous modeling of competitive adsorption and dual substrate biodegradation in completely mixed GAC reactors
Made available in DSpace on 2011-05-07T13:19:20Z (GMT). No. of bitstreams: 2 license.txt: 4922 bytes, checksum: 910b249b4beec47e7ab768910c8f966f (MD5) 9026336.pdf: 6192128 bytes, checksum: 9f3389bab074a21c068cb45633bdb7ac (MD5) Previous issue date: 1990
-
Mechanisms of competitive adsorption between trace organic contaminants and natural organic matter on activated carbon
Activated carbon adsorption is widely used in water treatment for removal of various organic micropollutants; nonetheless, the presence of natural organic matter (NOM) in source water can reduce its efficiency for micropollutant removal. NOM has been shown to compete with target contaminant via …
-
Roles of Background Compound Molecular Size and Adsorbent Pore Size Distribution in Competitive Adsorption on Activated Carbon
… 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. Atrazine adsorption capacity reduction caused by CR was similar for …
-
On Competitive Adsorption of Oxyanions by Soils (Freundlich Equation, Enthalphy of Adsorption, Selectivity Coefficient, Anion Mixtures, Anion)
The adsorption behavior of anionic mixtures (binary-solute combinations of arsenate, molybdate, and phosphate) by three soil samples (Cecil clay, EPA-14, and Catlin silt loam) was investigated using batch equilibrium techniques. The adsorption of arsenate and molybdate by all three soils was …
-
METHODS OF AREA-SELECTIVE ATOMIC LAYER DEPOSITION OF A METAL OXIDE USING SMALL MOLECULE INHIBITORS AND COMPETITIVE ADSORPTION
… (120, 285 °C) configurations. Pulsing a novel competitive co-adsorbate with the precursor in conjunction with cyclic reapplication of DMATMS demonstrated optimal (~99%) growth attenuation for a vapor-phase process. Finally, the capabilities of an improved reactant delivery system for …
-
Development of a Multi-Component Competitive Adsorption Model for GAC Systems and Application to Improve Hybrid Sorption -Membrane Processes
Granular activated carbon (GAC) adsorption is an important water treatment technique, but accurate, long-term prediction of trace compound adsorption has been elusive because of difficulties accounting for the competitive effects of heterogeneous natural organic matter (NOM). NOM exerts several …
-
Adsorption of mixed metal systems on kaolinite
… of the study was to evaluate the validity of the competitive adsorption equation presented by weber in describing metal adsorption on kaolinite. This equation describes adsorption competition among the components of a mixture of solutes. Adsorption studies were conducted for single and mixed metal …
-
Characterising Adsorption and Mass Transfer in Porous Media
… to unambiguously discriminate and characterise competitive adsorption and mass transfer processes in porous materials. This has primarily involved investigations on porous oxides; in particular silicas and aluminas commonly used as catalyst supports. The techniques used are demonstrated to be …
-
Study of Chemical States, Composition and Adsorption Behavior of Iron Coated Granular Activated Carbon (Fe-GAC) for Selenate Removal and Feasible Adsorbent Modifications
… structures using spectroscopic techniques. Adsorption kinetics and equilibrium experiments with initial selenium concentration of 1 mg/L were conducted under three different ionic strengths to study selenate adsorption behavior. Selenate adsorption reached equilibrium within 48 hours with …
-
Probing molecular adsorption on nobel metal nanosurfaces with surface-enhanced raman spectroscopy
… of this thesis is “ the exploration of molecular adsorption on plasmonic metal NPs via surface-enhanced Raman spectroscopy (SERS)”. The first work mainly focus on understanding and rationalizing the competitive adsorption of binary adsorbates on nanoparticles. 3D mathematic models which can …
-
Surface complexation modeling of Pb(II), Cd(II) and Se(IV) onto iron hydroxides in single and bisolute systems
… the mineral surfaces throughout this work. The adsorption of two divalent metals, Cd(II) and Pb(II), and one oxyanion, Se(IV) onto α-FeOOH and ferrihydrite was modeled in single and bi-solute systems using the TLM. Selection of all surface complexes was supported by evidence from extended x-ray …
-
Characterization of human expired breath by solid phase microextraction and analysis using gas chromatography-mass spectrometry and differential mobility spectrometry
… profiles for several compounds demonstrate competitive adsorption. 120 compounds were identified in breath with response variability between 23 - 117% about mean values. Feasibility of differential mobility spectroscopy for breath analysis was established, and this method will be the basis …
-
Engineered iron oxide nanoparticle-polymer composites for the removal of dissolved arsenic and antimony
… dosage) were investigated.Four cycles of adsorption-desorption experiment were conducted; the results demonstrating significant capability of the composites of removing the dissolved metalloids. In addition, the competitive adsorption of As and Sb to the composites was studied in batch …
Page 1 of 3