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Showing 1 to 20 of 25 for “"1,4-dioxane"”.
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Fundamental and Practical Aspects of Cometabolite Addition for 1,4-Dioxane Removal in Biofiltration
1,4-Dioxane is a probable human carcinogen and common contaminant in potable reuse water, drinking water, wastewater, groundwater, and landfill leachate. Historically used as a chlorinated solvent stabilizer, 1,4-dioxane can be found in legacy wastes, contaminated groundwater sites, and in trace …
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In Situ Oxidation of 1,4-Dioxane with Persulfate-Based Oxidation Activated by Iron Minerals
Groundwater contaminant plumes of 1,4-dioxane (dioxane) and its co-contaminants (chlorinated solvents) have been found at many hazardous waste sites. There is increasing attention paid to the persulfate-based activation method for in situ degradation of organic contaminants due to its high …
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Microorganisms and Functional Genes Associated with Cometabolic Degradation of 1,4-Dioxane in Biologically-Active Carbon Biofilters Applied for Potable Reuse Treatment
1,4-dioxane is a probable human carcinogen frequently found in water and wastewater systems at concentrations above the EPA one-in-one-million cancer risk level of 0.35 ug/L. 1,4-dioxane is not well removed through conventional treatment methods due to its polarity and resistance to biodegradation, …
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Removal of Total Organic Carbon and Emerging Contaminants in an Advanced Water Treatment process using Ozone-BAC-GAC
… to allow complete nitrification in the BAC. 1,4-dioxane, another contaminant of emerging concern, was monitored in the treatment process. Biodegradation of 1,4-dioxane was enhanced via addition of tetrahydrofuran as a growth substrate. Biodegradation of 1,4-dioxane can help reduce energy and …
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Development of novel adsorbents for the removal of emerging contaminants from water
… compounds (PFCs), bisphenol-A (BPA), and 1,4-dioxane have been detected in natural water at many places. The existing conventional wastewater treatment systems are not designed for the removal of these contaminants. This critical issue leads to the need for the development of advanced and …
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Infrared Studies of Intramolecular Rovibrational Relaxation (Kinetics, Energy Transfer)
… fluorescence spectra from dimethyl ether and 1,4 dioxane indicate that the energy distribution within each molecule is dependent upon the CH stretch that is excited. The fluctuations in the relaxed mode energy content with excitation energy can be fit by a statistical model which assumes coupling …
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Dipole moments and Kerr effect of poly(n-vinylcarbazole) and its complexes with trinitrofluorenone
… birefringence (Kerr effect) in solution in 1,4-dioxane were carried out over a range of temperatures. The magnitudes of the dipole moments and Kerr constants were found to vary with changes in the tacticity of poly(N-vinylcarbazole). The results of these measurements support the view that the …
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Vibrational predissociation spectroscopy of hydrogen-bonded complexes in the 10 micron region
… ((CH$\sb3$)$\sb3$COH)$\sb2$, Ar(1,4-dioxane), (1,4-dioxane)$\sb2$, Ar(d$\sb6$-acetone) and (d$\sb6$-acetone)$\sb2$ were also carried out in the 10 micron region.
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Peri-substituted dithianaphthalenes as sources of reactive intermediates in organic chemistry
… occurred when 295 was heated in H\(_2\)O/1,4-dioxane. Deuterium incorporation occurred on running the reaction in D\(_2\)O/1,4-dioxane. Refluxing 295 in PhCl resulted in deoxygenation to disulfide 65.
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Inclusion compounds : structure, reactivity and selectivity
… as a number of selected solvents including 1,4-dioxane, DMSO, morpholine, THF and acetone, preferably in channel type inclusion modes. In the latter two classes of inclusion compounds the inclusion is facilitated by the formation of hydrogen bonds from the host hydroxyl moieties to the guests.
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Total Synthesis and Stereochemical Revision of Pestalospirane B
… for the construction of the key substituted 1,4-dioxane intermediate 115 for application in the total synthesis of the natural products. A second model study investigated the synthesis of mono-substituted 1,4-dioxane 212 using the oxidative radical cyclisation method and demonstrated that the …
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The acidic sulfonimidation of aryl–oxazolines and the electrophilic fluorination of aryl–oxazolines
… the sulfonimidation products in refluxing 1,4–dioxane. The electron rich 2–oxazoline substrates worked well for the nucleophilic ring opening reactions while no reaction took place for the electron poor 2–oxazoline substrates. 4,4–dimethyl–2–phenyl–2–oxazoline was thus rationally designed …
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Thermochemical Study of Crystalline Solutes Dissolved in Ternary Hydrogen-Bonding Solvent Mixtures
… (Methyl tert-butyl ether, Dibutyl ether, or 1,4-Dioxane), an alcohol (1-Propanol, 2-Propanol, 1-Butanol, 2-Butanol, or 2-Methyl-1-propanol), and an alkane (Cyclohexane, Heptane, or 2,2,4-Trimethylpentane) cosolvents. The Combined NIBS (Nearly Ideal Binary Solvent)/Redlich-Kister equation was used …
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Balancing Bromate Formation, Organics Oxidation, and Pathogen Inactivation: The Impact of Bromate Suppression Techniques on Ozonation System Performance in Reuse Waters
… organics oxidation through the surrogate 1,4-dioxane, and N-nitrosodimethylamine (NDMA) formation. Additionally, bromate suppression mechanisms of monochloramine were explored further through a variety of different water quality parameters, such as through hydroxyl radical exposure and …
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Ruthenium Hydride Catalyzed Silylvinylation of Alkynes
… and a binary solvent system comprised of 1,4-dioxane and tert-amyl alcohol. The improved conditions were extended to provide a method for the regioselective coupling of polychlorinated aminopyridines.</p>
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DEVELOPMENT OF A NEW CHIRAL MONOLITHIC CAPILLARY COLUMN AND A FLUORESCENCE SPECTROSCOPIC STUDY OF A SELECTIVE OFF-ON PET SENSOR FOR THE DETECTION OF ZINC IONS
… conducted, using acetone/methanol (199:1), 1,4-dioxane, acetone, methanol and aqueous buffer as the solvent system. Similar to prior work from our group, the sensor was found to respond selectively to Zn2+ ions with fluorescence enhancement. The fluorescence properties and binding response were …
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Dielectric and Kerr Effect Studies of Electro-Active Polymer Complexes
… of poly(N-vinylcarbazole) in solution in 1,4-dioxane. The magnitude of the Kerr effect was found to vary with changes in tacticity for the range of molecular weights and molecular weight distributions considered in this study.
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Studies of the effects of molecular encounters on N.M.R. spin-lattice relaxation times
… of the 13C proton satellite of neat bezene, 1,4 dioxane and mesitylene were measured. Theoretical analyses of the data allow the calculation of Tl intra. Studies of intermolecular NOE's were found to afford a general method of separating observed T1's into their intra and intermolecular …
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Production of Light-independent Reactive Oxygen Species during Microbially-mediated Fe(II)/Fe(III) redox cycling and its Application in the Degradation of Organic Contaminants
… effect on organic carbon degradation, using 1,4-dioxane as a recalcitrant model organic contaminant. Overall, this dissertation contributes to our understanding of the light-independent production and role of ROS in natural environments by: 1) providing new insights into the importance of …
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Order in Thin Films of Diblock Copolymers by Supramolecular Assembly
… interfaces. The films deposited from 1,4-dioxane &#8211; a good solvent for PS and a bad one for PVP+HABA &#8211; demonstrated the perpendicular orientation of PVP+HABA domains. Meanwhile, the preparation of films from a chloroform solution &#8211; a good solvent for both PS …
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