Improved vacuum-UV (VUV)-initiated photomineralization of organic compounds in water with a xenon excimer flow-through photoreactor ( lamp, 172nm) containing an axially centered ceramic oxygenator

Oppenländer, Thomas; Walddörfer, Carsten; Burgbacher, Jens; Kiermeier, Martin; Lachner, Klaus; Weinschrott, Helga

doi:10.1016/j.chemosphere.2004.12.037

Cited by 35 publications

(26 citation statements)

References 14 publications

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“…These findings indicate that DO plays an important role in DOM mineralization, especially the intermediates of the DOM, which are initially radicalized by the • OH. 15,16 The results also show that the mineralization was sufficiently rapid under natural DO conditions, except for anoxic water samples. Therefore, additional oxygen gas was not used for subsequent experiments.…”

Section: Decomposition Of Organic Substances In Pure Water By Lpt Phosupporting

confidence: 49%

“…thickness of the portion of the solution in which • OH and the radicalized intermediates are produced is too low to react with the oxygen that is naturally present in a bulk solution as a result of the extremely strong absorption of 172 nm light. 15,16,18 Furthermore, for all VUV photoreactors, the decomposition efficiency of the DOM decreases in the presence of coexisting substances that absorb the VUV light and scavenge…”

Section: Introductionmentioning

confidence: 99%

“…The sample solution thickness should be less than several millimeters because the high absorption coefficient of water provides a short incident path for 185 nm light. [14][15][16] Some VUV flow-through photoreactors employing thin-film reaction chambers have achieved such decomposition, but they require a great deal of chemicals and facilities that are too expensive for analysis. For example, cylindrical thin-film photoreactors that employ mercury lamps use a reactor equipped with many polymer pins and an electric motor to stir the sample solution to promote decomposition.…”

Section: Introductionmentioning

confidence: 99%

“…12,[14][15][16]18 However, Xe-excimer lamps require high-frequency and high-voltage power supplies, which increase the costs and raise the necessary safety management levels. In some cases, rapid mineralization of the DOM requires additional oxygen gas because the The reagent-free mineralization of dissolved organic matter (DOM) in river water was achieved within 1 min using a lamp-pass-through photoreactor containing a narrow reaction tube (2 mm i.d.)…”

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

Online TOC Analysis Based on Reagent-free Oxidation of Dissolved Organic Matter Using a Mercury Lamp-Pass-Through Photoreactor

2013

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Section: Decomposition Of Organic Substances In Pure Water By Lpt Phosupporting

confidence: 49%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Online TOC Analysis Based on Reagent-free Oxidation of Dissolved Organic Matter Using a Mercury Lamp-Pass-Through Photoreactor

2013

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“…Interestingly, although without O 3 bubbling, the excimer/TMiP reactor shows the highest k 1 among reactors. We ascribed the results to reactive species and oxidative intermediates generated by VUV photolysis of water as mentioned by Oppenländer et al [24][25][26][27][28]. Hydroxyl radicals and other reactive species are formed by VUV photolysis of water and can directly react with organics due to their strong oxidation potentials.…”

Section: Test Methods For Evaluation Of the Water Purification Abilitymentioning

confidence: 99%

Synergistic Water-Treatment Reactors Using a TiO2-Modified Ti-Mesh Filter

Ochiai

Masuko

Tago

et al. 2013

Water

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Abstract:The recent applications of a TiO 2 -modified Ti-mesh filter (TMiP™) for water purification are summarized with newly collected data including biological assays as well as sewage water treatment. The water purification reactors consist of the combination of a TMiP, a UV lamp, an excimer VUV lamp, and an ozonation unit. The water purification abilities of the reactor were evaluated by decomposition of organic contaminants, inactivation of waterborne pathogens, and treatment efficiency for sewage water. The UV-C/TMiP/O 3 reactor disinfected E. coli in aqueous suspension in approximately 1 min completely, and also decreased the number of E. coli in sewage water in 15 min OPEN ACCESSWater 2013, 5 1102 dramatically. The observed rate constants of 7.5 L/min and 1.3 L/min were calculated by pseudo-first-order kinetic analysis respectively. Although organic substances in sewage water were supposed to prevent the UV-C/TMiP/O 3 reactor from purifying water, the reactor reduced E. coli in sewage water continuously. On the other hand, although much higher efficiencies for decomposition of organic pollutants in water were achieved in the excimer/TMiP reactor, the disinfection activity of the reactor for waterborne pathogens was not as effective as the other reactors. The difference of efficiency between organic pollutants and waterborne pathogens in the excimer/TMiP reactor may be due to the size, the structure, and the decomposition mechanism of the organic pollutants and waterborne pathogens. These results show that a suitable system assisted by synergy of photocatalysts and other technologies such as ozonation has a huge potential as a practical wastewater purification system.

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Photochemistry

Pfoertner¹,

Oppenländer

2012

Ullmann's Encyclopedia of Industrial Chemistry

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The article contains sections titled: 1. Introduction 2. Primary Photophysical Processes 2.1. The Laws of Photochemistry 2.2. Quantum Yield 3. Performance of Photochemical Reactions 3.1. Photoreactor Design 3.2. Light Sources 3.3. Materials 3.4. Scale‐up and Scale‐down (Micro‐Photoreactors) 3.5. Economic Considerations 4. Light‐Induced Chain Reactions 4.1. Photohalogenation 4.2. Photosulfochlorination 4.3. Photosulfoxidation 4.4. Type I Photooxidation 4.5. Photopolymerization 5. Quasi‐Stoichiometric Photoreactions 5.1. Photonitrosation 5.2. Photosynthesis of Previtamin D 5.3. Photoreactions in Supercritical Fluids 6. Photosensitized Reactions 6.1. ( E/Z )‐Isomerization of Tachysterol 6.2. Type II Photooxidation 7. Selected Useful Photoreactions 7.1. Enamide Cyclization 7.2. Cyclobutane Formation 7.3. Oxetane Formation 7.4. Oxadi‐ π ‐Methane Rearrangement 7.5. 1,3‐Dipolar Cycloaddition 8. Environmental Applications 8.1. Advanced Oxidation Technologies (AOTs) 8.2. Photocatalysis 8.3. UV‐Disinfection

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Improved vacuum-UV (VUV)-initiated photomineralization of organic compounds in water with a xenon excimer flow-through photoreactor ( lamp, 172nm) containing an axially centered ceramic oxygenator

Cited by 35 publications

References 14 publications

Online TOC Analysis Based on Reagent-free Oxidation of Dissolved Organic Matter Using a Mercury Lamp-Pass-Through Photoreactor

Online TOC Analysis Based on Reagent-free Oxidation of Dissolved Organic Matter Using a Mercury Lamp-Pass-Through Photoreactor

Synergistic Water-Treatment Reactors Using a TiO2-Modified Ti-Mesh Filter

Photochemistry

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