The Experts below are selected from a list of 203127 Experts worldwide ranked by ideXlab platform
Chadwick A Tolman - One of the best experts on this subject based on the ideXlab platform.
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figures of merit for the technical development and application of advanced oxidation technologies for both electric and solar driven systems iupac technical report
Pure and Applied Chemistry, 2001Co-Authors: James R Bolton, Keith G Bircher, William Tumas, Chadwick A TolmanAbstract:Advanced oxidation technologies (AOTs), which involve the in situ generation of highly potent chemical oxidants, such as the hydroxyl radical (•OH), have emerged as an important class of technologies for accelerating the oxidation (and hence removal) of a wide range of organic contaminants in polluted water and air. In this report, standard figures-of-merit are proposed for the comparison and evaluation of these waste treatment technologies. These figures-of-merit are based on electric-energy consumption (for electric-energy-driven systems) or collector area (for solar-energy-driven systems). They fit within two phenomenological Kinetic Order regimes: 1) for high contaminant concentrations (electric energy per mass, EEM, or collector area per mass, ACM) and 2) for low concentrations (electric energy per Order of magnitude, EEO, or collector area per Order of magnitude, ACO). Furthermore, a simple understanding of the overall Kinetic behavior of organic contaminant removal in a waste stream (i.e., whether zeroor first-Order) is shown to be necessary for the description of meaningful electricor solar-energy efficiencies. These standard figures-of-merit provide a direct link to the electricor solar-energy efficiency (lower values mean higher efficiency) of an advanced oxidation technology, independent of the nature of the system, and therefore allow for direct comparison of widely disparate AOTs. These figures-of-merit are also shown to be inversely proportional to fundamental efficiency factors, such as the lamp efficiency (for electrical systems), the fraction of the emitted light that is absorbed in the aqueous solution, and the quantum yield of generation of active radicals.
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figures of merit for the technical development and application of advanced oxidation technologies for both electric and solar driven systems iupac technical report
Pure and Applied Chemistry, 2001Co-Authors: James R Bolton, William Tumas, Keith Bircher, Chadwick A TolmanAbstract:Advanced oxidation technologies (AOTs), which involve the in situ generation of highly potent chemical oxidants, such as the hydroxyl radical (•OH), have emerged as an important class of technologies for accelerating the oxidation (and hence removal) of a wide range of organic contaminants in polluted water and air. In this report, standard figures-of-merit are proposed for the comparison and evaluation of these waste treatment technologies. These figures-of-merit are based on electric-energy consumption (for electric-energy-driven systems) or collector area (for solar-energy-driven systems). They fit within two phenomenological Kinetic Order regimes: 1) for high contaminant concentrations (electric energy per mass, EEM, or collector area per mass, ACM) and 2) for low concentrations (electric energy per Order of magnitude, EEO, or collector area per Order of magnitude, ACO). Furthermore, a simple understanding of the overall Kinetic behavior of organic contaminant removal in a waste stream (i.e., whether zeroor first-Order) is shown to be necessary for the description of meaningful electricor solar-energy efficiencies. These standard figures-of-merit provide a direct link to the electricor solar-energy efficiency (lower values mean higher efficiency) of an advanced oxidation technology, independent of the nature of the system, and therefore allow for direct comparison of widely disparate AOTs. These figures-of-merit are also shown to be inversely proportional to fundamental efficiency factors, such as the lamp efficiency (for electrical systems), the fraction of the emitted light that is absorbed in the aqueous solution, and the quantum yield of generation of active radicals.
Ioannis Poulios - One of the best experts on this subject based on the ideXlab platform.
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optimized photocatalytic degradation of alcian blue 8 gx in the presence of tio2 suspensions
Journal of Hazardous Materials, 2007Co-Authors: Anca Florentina Caliman, Corneliu Cojocaru, Apostolos Antoniadis, Ioannis PouliosAbstract:The photocatalytic degradation of Alcian Blue 8 GX, a cationic copper phthalocyanine dye, has been investigated in aqueous suspensions containing the commercial catalyst TiO2 P-25. The photodegradation of the organic molecule follows approximately a pseudo-first Kinetic Order, according to the Langmuir–Hinshelwood model. The effect of catalyst concentration, pH of the initial solution and the H2O2 concentration upon the reaction rate was ascertained. It was shown that the photocatalytic degradation reaction can be mathematically described as a function of parameters such as pH, H2O2 concentration and irradiation time, being modeled by the use of the response surface methodology. Optimized values for oxidizing agent, concentration, pH and UV exposure time for the studied system were determined.
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photooxidation of eosin y in the presence of semiconducting oxides
Applied Catalysis B-environmental, 2003Co-Authors: Ioannis Poulios, E Micropoulou, R Panou, E KostopoulouAbstract:Abstract The photocatalytic degradation of eosin Y, an anionic xanthene fluorescent dye, has been investigated in aqueous heterogeneous solutions containing TiO 2 P-25 and ZnO as photocatalysts. The disappearance of the organic molecule follows approximately a pseudo-first Kinetic Order according to the Langmuir–Hinshelwood model. The effect of H 2 O 2 on the reaction rate is ascertained. CO 2 and Br − ions have been identified as mineralization products, while toxicity experiments showed a 85% reduction of the toxicity of an eosin Y solution after 60 min of photocatalytic treatment. The initial photonic efficiency ( ζ ) of decolorization, as well as mineralization under various experimental conditions have been calculated.
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photocatalytic degradation of the textile dye reactive orange 16 in the presence of tio2 suspensions
Environmental Technology, 1999Co-Authors: Ioannis Poulios, I AetopoulouAbstract:The photocatalytic degradation of Reactive Orange 16, a textile azo dye, has been investigated in aqueous heterogeneous solutions containing titanium dioxide TiO2 as photocatalyst. The disappearance of the organic molecule follows approximately a pseudo-first Kinetic Order according to the Langmuir-Hinshelwood model. CO2, NO3 −, NH4 + and SO4 2− ions have been identified as mineralization products. Various commercial photocatalysts were compared with respect to their decolorization efficiency, as well as the production of CO2. The effect of pH and H2O2 on the reaction rate was ascertained.
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photodegradation of the textile dye reactive black 5 in the presence of semiconducting oxides
Journal of Chemical Technology & Biotechnology, 1999Co-Authors: Ioannis Poulios, I TsachpinisAbstract:The photocatalytic degradation of Reactive Black 5, a textile azo dye, has been investigated in aqueous heterogeneous solutions containing semiconductor oxides as photocatalysts. The disappearance of the organic molecule follows approximately a pseudo-first Kinetic Order according to the Langmuir-Hinshelwood model. CO 2 , NO 3 - , and SO 4 2- ions have been identified as mineralization products. Various commercial photocatalysts were compared with respect to their decolorization efficiency, as well as the production of CO 2 . The effect of pH and H 2 O 2 on the reaction rate was ascertained.
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photocatalytic decomposition of triclopyr over aqueous semiconductor suspensions
Journal of Photochemistry and Photobiology A-chemistry, 1998Co-Authors: Ioannis Poulios, M Kositzi, Athanasios KourasAbstract:Abstract The photocatalytic degradation of 3,5,6-trichloro-2-pyridinyloxyacetic acid (Triclopyr), a pyridine analogue of the phenoxy herbicides, has been investigated in aqueous heterogeneous solutions containing TiO2 or ZnO as photocatalyst. The disappearance of the organic molecule follows approximately a pseudo-first Kinetic Order according to the Langmuir-Hinselwood model. As mineralization products, CO2 and Cl− ions have been identified, whereas the nitrogen atom forms only NH4+ ions. Various commercial photocatalysts were compared with respect to their overall efficiency, as well as the production of CO2. The effect of pH and H2O2 on the reaction rate was ascertained. The photooxidation of Triclopyr has also been monitored with FTIR spectroscopy.
James R Bolton - One of the best experts on this subject based on the ideXlab platform.
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figures of merit for the technical development and application of advanced oxidation technologies for both electric and solar driven systems iupac technical report
Pure and Applied Chemistry, 2001Co-Authors: James R Bolton, Keith G Bircher, William Tumas, Chadwick A TolmanAbstract:Advanced oxidation technologies (AOTs), which involve the in situ generation of highly potent chemical oxidants, such as the hydroxyl radical (•OH), have emerged as an important class of technologies for accelerating the oxidation (and hence removal) of a wide range of organic contaminants in polluted water and air. In this report, standard figures-of-merit are proposed for the comparison and evaluation of these waste treatment technologies. These figures-of-merit are based on electric-energy consumption (for electric-energy-driven systems) or collector area (for solar-energy-driven systems). They fit within two phenomenological Kinetic Order regimes: 1) for high contaminant concentrations (electric energy per mass, EEM, or collector area per mass, ACM) and 2) for low concentrations (electric energy per Order of magnitude, EEO, or collector area per Order of magnitude, ACO). Furthermore, a simple understanding of the overall Kinetic behavior of organic contaminant removal in a waste stream (i.e., whether zeroor first-Order) is shown to be necessary for the description of meaningful electricor solar-energy efficiencies. These standard figures-of-merit provide a direct link to the electricor solar-energy efficiency (lower values mean higher efficiency) of an advanced oxidation technology, independent of the nature of the system, and therefore allow for direct comparison of widely disparate AOTs. These figures-of-merit are also shown to be inversely proportional to fundamental efficiency factors, such as the lamp efficiency (for electrical systems), the fraction of the emitted light that is absorbed in the aqueous solution, and the quantum yield of generation of active radicals.
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figures of merit for the technical development and application of advanced oxidation technologies for both electric and solar driven systems iupac technical report
Pure and Applied Chemistry, 2001Co-Authors: James R Bolton, William Tumas, Keith Bircher, Chadwick A TolmanAbstract:Advanced oxidation technologies (AOTs), which involve the in situ generation of highly potent chemical oxidants, such as the hydroxyl radical (•OH), have emerged as an important class of technologies for accelerating the oxidation (and hence removal) of a wide range of organic contaminants in polluted water and air. In this report, standard figures-of-merit are proposed for the comparison and evaluation of these waste treatment technologies. These figures-of-merit are based on electric-energy consumption (for electric-energy-driven systems) or collector area (for solar-energy-driven systems). They fit within two phenomenological Kinetic Order regimes: 1) for high contaminant concentrations (electric energy per mass, EEM, or collector area per mass, ACM) and 2) for low concentrations (electric energy per Order of magnitude, EEO, or collector area per Order of magnitude, ACO). Furthermore, a simple understanding of the overall Kinetic behavior of organic contaminant removal in a waste stream (i.e., whether zeroor first-Order) is shown to be necessary for the description of meaningful electricor solar-energy efficiencies. These standard figures-of-merit provide a direct link to the electricor solar-energy efficiency (lower values mean higher efficiency) of an advanced oxidation technology, independent of the nature of the system, and therefore allow for direct comparison of widely disparate AOTs. These figures-of-merit are also shown to be inversely proportional to fundamental efficiency factors, such as the lamp efficiency (for electrical systems), the fraction of the emitted light that is absorbed in the aqueous solution, and the quantum yield of generation of active radicals.
Yousef Ghorbani - One of the best experts on this subject based on the ideXlab platform.
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The Order of Kinetic Models, Rate Constant Distribution, and Maximum Combustible Recovery in Gilsonite Flotation
Mining Metallurgy & Exploration, 2019Co-Authors: Ataallah Bahrami, Fatemeh Kazemi, Yousef Ghorbani, Jafar Abdolahi SharifAbstract:Kinetic models are the most important tool for predicting and evaluating the performance of flotation circuits. Gilsonite is a natural fossil resource similar to an oil asphalt, high in asphaltenes. Here, in Order to determine the Kinetic Order and flotation rate of a gilsonite sample, flotation experiments were carried out in both rougher and cleaner stages. Experiments were conducted using the combinations of oil–MIBC and gas oil–pine oil, with one test without collector and frother. Five Kinetic models were applied to the data obtained from the flotation tests using MATLAB software. Statistical analysis showed that the results of the experiment with oil–MIBC were highly in compliance with all models. Kinetic constants ( k ) were calculated as 0.1548 (s^−1) and 0.0450 (s^−1) for rougher and cleaner stages, respectively. Rougher and cleaner tests without collector and frother also matched all models well ( R ^2 > 0.98), with k values of 0.2163 (s^−1) and 0.284 (s^−1), respectively. The relationship between flotation rate constant, maximum combustible recovery, and particle size showed that the maximum flotation combustible recovery and flotation rate were obtained in the size range of −250 + 106 μm in the rougher and cleaner stages. The combustible recovery and flotation rate were higher in the rougher flotation process than in the cleaner stage.
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effect of different reagent regime on the Kinetic model and recovery in gilsonite flotation
Journal of materials research and technology, 2019Co-Authors: Ataallah Bahrami, Fatemeh Kazemi, Yousef GhorbaniAbstract:Abstract Gilsonite is a natural fossil resource, similar to an oil asphalt high in asphaltenes. To determine the effect of reagent regime on the Kinetic Order and rate of flotation for a gilsonite sample, experiments were carried out in both rougher and cleaner flotation process. Experiments were conducted using different combinations of reagent: oil – MIBC; gasoline – pine oil; and one test without any collector and frother. According to results, Kinetic in the test performed using the oil – MIBC and without any collector and frother were found to be first-Order unlike the Kinetic in the test conducted using the gasoline – pine oil. Five Kinetic models were applied to the modeling of data from the flotation tests by using MATrix LABoratory software. The results show that all experiments are highly in compliance with all models. The Kinetic constants (k) in rougher stage were calculated as 0.1548 (s−1), 0.2300 (s−1) and 0.2163 (s−1) for oil – MIBC, gasoline – pine oil, and test without any collector and frother, respectively. These amounts in the cleaner stage were 0.0450 (s−1), 0.1589 (s−1) and 0.0284 (s−1), respectively. The relationship between k, maximum combustible recovery ( R ∞ ) and particle size was also studied. The results showed that the R ∞ and k were obtained with a coarse particle size of (−250 + 106) μm in the rougher and (−850 + 500) μm in cleaner flotation processes.
William Tumas - One of the best experts on this subject based on the ideXlab platform.
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figures of merit for the technical development and application of advanced oxidation technologies for both electric and solar driven systems iupac technical report
Pure and Applied Chemistry, 2001Co-Authors: James R Bolton, Keith G Bircher, William Tumas, Chadwick A TolmanAbstract:Advanced oxidation technologies (AOTs), which involve the in situ generation of highly potent chemical oxidants, such as the hydroxyl radical (•OH), have emerged as an important class of technologies for accelerating the oxidation (and hence removal) of a wide range of organic contaminants in polluted water and air. In this report, standard figures-of-merit are proposed for the comparison and evaluation of these waste treatment technologies. These figures-of-merit are based on electric-energy consumption (for electric-energy-driven systems) or collector area (for solar-energy-driven systems). They fit within two phenomenological Kinetic Order regimes: 1) for high contaminant concentrations (electric energy per mass, EEM, or collector area per mass, ACM) and 2) for low concentrations (electric energy per Order of magnitude, EEO, or collector area per Order of magnitude, ACO). Furthermore, a simple understanding of the overall Kinetic behavior of organic contaminant removal in a waste stream (i.e., whether zeroor first-Order) is shown to be necessary for the description of meaningful electricor solar-energy efficiencies. These standard figures-of-merit provide a direct link to the electricor solar-energy efficiency (lower values mean higher efficiency) of an advanced oxidation technology, independent of the nature of the system, and therefore allow for direct comparison of widely disparate AOTs. These figures-of-merit are also shown to be inversely proportional to fundamental efficiency factors, such as the lamp efficiency (for electrical systems), the fraction of the emitted light that is absorbed in the aqueous solution, and the quantum yield of generation of active radicals.
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figures of merit for the technical development and application of advanced oxidation technologies for both electric and solar driven systems iupac technical report
Pure and Applied Chemistry, 2001Co-Authors: James R Bolton, William Tumas, Keith Bircher, Chadwick A TolmanAbstract:Advanced oxidation technologies (AOTs), which involve the in situ generation of highly potent chemical oxidants, such as the hydroxyl radical (•OH), have emerged as an important class of technologies for accelerating the oxidation (and hence removal) of a wide range of organic contaminants in polluted water and air. In this report, standard figures-of-merit are proposed for the comparison and evaluation of these waste treatment technologies. These figures-of-merit are based on electric-energy consumption (for electric-energy-driven systems) or collector area (for solar-energy-driven systems). They fit within two phenomenological Kinetic Order regimes: 1) for high contaminant concentrations (electric energy per mass, EEM, or collector area per mass, ACM) and 2) for low concentrations (electric energy per Order of magnitude, EEO, or collector area per Order of magnitude, ACO). Furthermore, a simple understanding of the overall Kinetic behavior of organic contaminant removal in a waste stream (i.e., whether zeroor first-Order) is shown to be necessary for the description of meaningful electricor solar-energy efficiencies. These standard figures-of-merit provide a direct link to the electricor solar-energy efficiency (lower values mean higher efficiency) of an advanced oxidation technology, independent of the nature of the system, and therefore allow for direct comparison of widely disparate AOTs. These figures-of-merit are also shown to be inversely proportional to fundamental efficiency factors, such as the lamp efficiency (for electrical systems), the fraction of the emitted light that is absorbed in the aqueous solution, and the quantum yield of generation of active radicals.
