Relevant bibliographies by topics / UV-photochemical reactor

Contents

  1. Journal articles
  2. Dissertations / Theses
  3. Book chapters
  4. Conference papers
  5. Reports

Academic literature on the topic 'UV-photochemical reactor'

Author: Grafiati
Published: 4 June 2021
Last updated: 1 February 2022

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Journal articles on the topic "UV-photochemical reactor"

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Luo, Minghan, Wenjie Xu, and Taeseop Jeong. "Development and numerical modelling of a novel UV/H2O2 rotating flow reactor for water treatment." Water Science and Technology 83, no. 5 (February 12, 2021): 1217–29. http://dx.doi.org/10.2166/wst.2021.063.

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Abstract The ultraviolet photochemical degradation process is widely applied in wastewater treatment due to its low cost, high efficiency and sustainability. In this study, a novel rotating flow reactor was developed for UV-initiated photochemical reactions. The reactor was run in a continuous flow mode, and the tangential installation of the inlet and outlet on the annular reactor improved reaction rates. Numerical modelling, which combined solute transport, radiation transfer and photochemical kinetic degradation processes, was conducted to evaluate improvement compared to current reactor designs. Methylene Blue (MB) decomposition efficiency from the modelling results and the experimental data agreed well with each other. The model results showed that a rotational motion of fluid was well developed inside the designed reactor for a wide range of inflow rates; the generation of ·OH radicals significantly depended on UV irradiation dose, and thus the degradation ratio of MB showed a strong correlation with the UV irradiation distribution. In addition, the comprehensive numerical modelling showed promising potential for the simulation of UV/H2O2 processes in rotating flow reactors.
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Griebenow, Nils, Stefan Bräse, and Alica M. Dilmac. "Application of a novel small scale UV LED photochemical batch reactor for the thiol-yne reaction." RSC Advances 5, no. 67 (2015): 54301–3. http://dx.doi.org/10.1039/c5ra08787b.

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Zou, Zhirong, Fujian Xu, Yunfei Tian, Xiaoming Jiang, and Xiandeng Hou. "A miniaturized UV-LED photochemical vapor generator for atomic fluorescence spectrometric determination of trace selenium." Journal of Analytical Atomic Spectrometry 33, no. 7 (2018): 1217–23. http://dx.doi.org/10.1039/c8ja00052b.

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Karpel Vel Leitner, N., E. Le Bras, E. Foucault, and J. L. Bousgarbiès. "A new photochemical reactor design for the treatment of absorbing solutions." Water Science and Technology 35, no. 4 (February 1, 1997): 215–22. http://dx.doi.org/10.2166/wst.1997.0122.

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The recent developments in the field of Advanced Oxidation Processes (AOP) require improvements in reactor design. Indeed, light-induced procedures cannot be used for the removal of micropollutants in strong absorbing solutions. In this work, the technical design concept for mixing in a cylindrical reactor has been approached in a rational way for the treatment of compounds in highly absorbing solutions. The new photochemical reactor perfected in our laboratory consists of an annular reactor with one UV lamp in axial position. However, this reactor differs from classical ones since the rotation of the quartz sleeve protecting the lamp associated with the flux of the solution establishes a Couette-Taylor type flow. This means that toroïcal eddies are formed between the two surfaces of the cylindrical reactor and thus, periodically, each fraction of liquid comes near the UV source. Three photochemical processes with irradiation at 254 nm have been examined: direct photolysis, H2O2/UV and TiO2/UV for the removal of organic micropollutants such as atrazine and aliphatic acids in strongly absorbant solutions. Para-nitrophenol in the concentration range 1.0 to 2.3 mmol.L−1 (3.0-6.4 cm−1) has been added to the water to be treated as a product that absorbs the 254 nm light. The overall effect simulates that of an inner filter absorbing incident photons. In several experiments, para-nitrophenol was replaced by a mineral component bentonite. Experiments showed that under these experimental conditions, for the three photochemical systems, the yield of oxidation was significantly increased as a result of the rotating movement of the central cylinder. This new design will be able to improve the efficiency of commonly used industrial reactors.
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Luo, Minghan, Fan Zeng, Taeseop Jeong, Gongde Wu, and Qingqing Guan. "CFD Modeling of UV/H2O2 Process in Internal Airlift Circulating Photoreactor." Water 12, no. 11 (November 18, 2020): 3237. http://dx.doi.org/10.3390/w12113237.

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UV chemical degradation is a low-cost and sustainable wastewater treatment technology that protects the environment. In this study, computational fluid dynamics (CFD), mass transfer, and photochemical kinetic models combined with the continuous flow mode of UV/H2O2 were applied for the photochemical reaction of internal airlift circulation photocatalytic reactor to improve the efficiency of the reaction. Results show that with the increase in gas flow rate, the turbulence intensity and internal circulation effect of liquid in the reactor can be enhanced under the condition of constant baffle spacing. The CFD simulation prediction results of the chemical components in the liquid flow show that H2O2 has a high correlation with the OH radical formation, which depends on the intensity of UV. Thus, the degradation rate of methylene blue (MB) has a high correlation with UV intensity. The degradation efficiency of MB is improved with the increase in gas velocity by comparing the experimental data with the numerical simulation data. The experimental data are generally lower than the numerical prediction data, and although a certain difference range is observed, the overall prediction results are better.
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Fortunato, Milene A. G., Chi-Phong Ly, Filipa Siopa, and Carlos A. M. Afonso. "Process Intensification for the Synthesis of 6-Allyl-6-azabicyclo[3.1.0]hex-3-en-2-ol from 1-Allylpyridinium Salt Using a Continuous UV-Light Photoflow Approach." Methods and Protocols 2, no. 3 (August 5, 2019): 67. http://dx.doi.org/10.3390/mps2030067.

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A new home-made UV photochemical reactor (95 cm of irradiation zone) consisting of a 12 parallel quartz tubes flow reactor, PQT6 (95 cm under irradiation and an internal diameter of 0.6 cm) was assembled to perform photochemical transformations in continuous-flow. PQT6 was evaluated for the photoreaction of 1-allylpyridinium bromide (1a) to 6-allyl-6-azabicyclo[3.1.0]hex-3-en-2-ol (2a), in a continuous process. This technology provides reduced reaction times, continuous production of 2a, and a productivity of 129 mg h−1, corresponding to 1.94 g of isolated 2a after 15 h of irradiation.
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Mukhopadhyay, Mausumi, and Dhiraj P. Daswat. "Photochemical degradation of 4-chlorophenol in the aqueous phase using peroxyacetic acid (PAA)." Water Science and Technology 67, no. 2 (January 1, 2013): 440–45. http://dx.doi.org/10.2166/wst.2012.591.

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The photochemical degradation of 4-chlorophenol (4-CP) using ultraviolet irradiation (UV) of 6, 12 and 18 W with peroxyacetic acid (PAA) was studied in a batch reactor. The objective of this work was to investigate degradation and mineralization of 4-CP by PAA. The degradation efficiency increased with increasing UV input. The degradation process was also pH and initial PAA concentration dependent. The optimum conditions for the photochemical degradation of 4-CP as UV input, pH and PAA concentration was found to be 18 W, 9.5 and 3,040 ppm. The reaction efficiency decreased with increasing initial 4-CP concentrations. More than 95% mineralization of 4-CP was achieved with the UV/PAA process. The chloride ion concentration and chemical oxygen demand (COD) was evaluated. The chloride ion concentration and COD were decreased gradually with increasing UV input. Samples were analyzed by high pressure liquid chromatography (HPLC), UV spectrophotometry and gas chromatography–mass spectrometry (GC-MS) for residual concentration and identification of final degraded products.
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Moreira, Ailton Jose, Thales Martins Silva, and Gian Paulo Giovanni Freschi. "Caracterização de reator fotoquímico para aplicações em processos oxidativos avançados." Acta Brasiliensis 3, no. 3 (September 30, 2019): 124. http://dx.doi.org/10.22571/2526-4338240.

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This study broadens the understanding of photochemical processes by calculating the quantum efficiency of the Hg-MDEL lamp and discusses the environmental application of this lamp model in advanced oxidative processes. This set of information is relevant to broaden the application of Hg-MDEL in various environmental studies. Thus, a photochemical reactor composed of a microwave-fired mercury-free mercury (Hg-MDEL) lamp (MW) was evaluated from KI/KIO3 actinometric studies. The emission spectra were characterized along the UV-A, UV-B, UV-C and visible regions by means of a spectroradiometer, displaying linear correlation with the microwave power variation applied. The photochemical conversion of KI / KIO3 to I3- was up to 0.073 mmol L-1 when the KI initial concentration was 0.1 mol L-1 and 0.65 mmol L-1 when the KI concentration was 0.7 mol L-1, applying a microwave power of 600 and 400 W respectively. These results indicate that the photon emission near the reactor is more significant for higher powers, actively contributing to the formation of I3-.
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Petrova, Angelina, Olga Tchaikovskaja, and Inna Plotnikova. "Photodegradation of Methylene Green in the Presence of Polypropylene Microfiber Material." Key Engineering Materials 781 (September 2018): 200–205. http://dx.doi.org/10.4028/www.scientific.net/kem.781.200.

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Degradation of toxicants in photocatalytic reactor is studied. To an array of data on the photochemical properties of Methylene Green (MG) when exposed to UV radiation in photoreactors was obtained. Based on the analysis of the results obtained, conclusions can be drawn about the relationship between the structure of pollutants, their initial concentration, oxidizer concentration, etc., with the efficiency of utilization, and schemes for photochemical processes was constructed. The role of polypropylene microfiber materials (PMM) in the degradation of MG under UV irradiation was studied.
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Fu, J., J. Huang, Z. Liu, Q. F. Zeng, S. Q. An, and H. L. Zhu. "Comparative study of degradation of 4-chlorophenol by ultraviolet irradiation/sodium hypochlorite and ultraviolet irradiation/ozonation." Water Supply 9, no. 5 (December 1, 2009): 601–9. http://dx.doi.org/10.2166/ws.2009.490.

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The photochemical oxidation of 4-chlorophenol solutions by ultraviolet irradiation/sodium hypochlorite (UV/NaClO) and ultraviolet irradiation/ozonation (UV/O3) respectively was studied in a pilot scale photochemical reactor. The degradation efficiency of UV/NaClO was lower than that of UV/O3. The final UV absorption removals of the two processes were approximately 80% and approximately 90% respectively. During the two processes, dihydroxylated chlorophenols were the main intermediates. And pH values decreased with the oxidation being carried on. However, the UV/NaClO process was incomplete and some adsorbable organic halogens, such as ethyl 2-chloroacetate, 3,4-dichlorobut-3-en-2-one, ethyl 2,2-dichloroacetate, 2-chloro-1,1-diethoxyethane, ethyl 2,2,2-trichloroacetate and 2,4,6-trichlorophenol, still existed in the final solution. The costs of the two processes were also estimated. On a small scale, UV/NaClO process had significant economic advantage.
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Dissertations / Theses on the topic "UV-photochemical reactor"

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Parlar, Suzan. "Untersuchungen zur photoechemischen Stabilität mittels Durchflußreaktoren (hv-HPLC)." Doctoral thesis, Humboldt-Universität zu Berlin, Mathematisch-Naturwissenschaftliche Fakultät I, 2000. http://dx.doi.org/10.18452/14536.

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Ziel der vorliegenden Arbeit war die Herstellung, der Einsatz und die Bewertung von Durchfluss-Photoreaktoren für online Prüfungen zur photochemischen Stabilität im HPLC-System (hn- HPLC). Neben der Anfertigung eines für dieses Anforderungsprofil geeigneten Reaktors war es von Interesse, Strahlungsintensitäten zu bestimmen, die Photostabilität von UV-Filtern zu bewerten, sowie analytische Verfahren zu optimieren. Als wichtigste Ergebnisse dieser Arbeit sind: (1) erstmalig aktinometrische Messungen im Durchfluss durchgeführt worden, (2) die eingestrahlten Intensität im Durchfluss-Reaktor mit dem Standard-Sonnenspektrum (COLIPA) verglichen worden, (3) die Bestimmung von 4-Aminobenzoesäure (PABA) und 4-Acetamidobenzoesäure (PAABA) mittels HPLC-hn optimiert und (4) photochemische Umsätze an folgenden UV-Filtern festgestellt worden: 4-Methoxy-zimtsäure-2-ethyl-hexylester, 3-(4'-Methyl)benzyliden-bornan-2-on,1-(4-tert.-Butylphenyl)-3-(4-methoxyphenyl)propan-1.3-dion und 4-Aminobenzoesäure.
The aim of the present thesis was the construction and evaluation of an on-line photochemical reactor for photochemical stability tests in an HPLC-system (hn- HPLC). The work was focused on the production of a functional and effective photochemical reactor, the determination of radiation intensities and the optimisation of analytical methods. Furthermore the stability of UV-filters under exposure to UV-radiation was investigated. The main results of these thesis are presented in the following: (1) the determination of radiation intensities in online photochemical reactors, (2) the comparison of spectra with standard-sun spectra (COLIPA), (3) the optimisation of the determination of 4-aminobenzoic acid (PABA) and 4-acetamidobenzoic acid (PAABA) with an HPLC-hn method (4) the characterisation of photochemical changes of UV-filters: p-methoxy-cinnamic acid-2-ethyl-hexyl ester, 3-(4'-methyl)benzylidene-bornan-2-on,1-(4-tert.-butylphenyl)-3-(4-methoxyphenyl)propan-1,3-dion and p-aminobenzoic acid.
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Papazia, Mariam Eugénie. "Comportement de molécules biocides thiocyanées dans l'environnement : étude de leur dégradation : décomposition du sulfure de diméthyle, modèle de molécule soufrée, légère, malodorante : interactions de surface DMS-TiO2." Université Joseph Fourier (Grenoble), 1995. http://www.theses.fr/1995GRE10172.

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Le thiocyano-methylthio-benzothiazole (tcmtb) et le bis-thiocyanate de methylene (mtc) sont des biocides a caractere fongicide. Ils sont surtout employes dans le traitement des eaux de papeteries ou dans la protection du bois, en vue de remplacer des composes polychlores, de type pentachlorophenol, destines a terme a disparaitre des marches a cause de leur grande toxicite. Nous avons etudie leur comportement dans l'environnement, en les soumettant a une hydrolyse a ph basique, ainsi qu'a une irradiation uv simulant le spectre solaire. Nous avons constate que, lors de leur decomposition, des composes soufres apparaissaient dans la phase gazeuse, tels un heterocycle soufre et du disulfure de carbone, et dans la phase aqueuse. Des mecanismes reactionnels de ces formations ont ete envisages. Le mercaptobenzothiazole, (mbt), est un des produits majoritaires de decomposition du tcmtb en phase aqueuse. Une etude phytotoxique comparee du tcmtb et du mbt a montre que ce dernier etait moins toxique que son precurseur vis-a-vis des vegetaux superieurs. Ces etudes ont ete completees par des essais de degradation des molecules sous une irradiation uv energetique. Une autre partie de notre travail a consiste a mettre en uvre une etude de decomposition photocatalytique en phase gazeuse d'une molecule legere, soufree, et malodorante, le sulfure de dimethyl (dms) etant choisi comme modele. A cet effet, un reacteur de photocatalyse heterogene a ete elabore, comportant un lit de dioxyde de titane, a travers lequel circule un flux air dms. Une decomposition rapide du dms par ce procede a ete mise en evidence. Nous avons entrepris une etude des interactions de surface dms-dioxyde de titane par des mesures d'isothermes d'adsorption, completees par de la spectroscopie raman, afin de contribuer a elucider le mecanisme catalytique
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Ayed, Othman. "Etude des interactions entre atomes alcalins (li, na, k) et monoxyde de carbone en matrices de gaz rares : analyse en spectroscopie vibrationnelle et calcul quantiques de quelques complexes." Paris 6, 1987. http://www.theses.fr/1987PA066117.

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Dans le cas de li(le plus reactif), identification de li(co)::(n), ou n = 1,2,3,4,(ou 6), avec des frequences de vibration de valence de co plus perturbees que pour les metaux de transition carbonyle,et de li::(m) co, ou m = 2,3, avec frequences nu (co) abaissees. Pour na et k, observation d'especes de haute stoechiometrie (c::(n)o::(n))**(2-) (m**(+))::(2) ou n = 2,3,4, formees apres irradiation uv-visible et correspondant a des transformations chimiques. Essai d'interpretation de ces differences de reactivite par une description quantique des agregats de plus basse stoechiometrie : dans le complexe 1 :1, les deux etats electroniques inferieurs sont l'etat **(2)sigma non liant et l'etat **(2)pi liant; la courbe de potentiel de lico possede un minimum pour li-c equiv. A 2,5 a au-dessous de la courbe de l'etat **(2)pi alors que pour naco, le minimum de la courbe pour l'etat **(2)pi est au-dessous de la courbe de l'etat **(2)sigma ; le calcul met en evidence le caractere ionique de m::(2)c::(2)o::(2) (acetylenediolate) resultant d'une reaction chimique
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Linhart, Ondřej. "Speciační analýza arsenu a rtuti pomocí postkolonového generování těkavých sloučenin pro potřeby atomových spektrometrických metod." Doctoral thesis, 2018. http://www.nusl.cz/ntk/nusl-389064.

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The presented dissertation thesis deals with the use of UV-photochemical generation of volatile compounds (UV-PVG) as a derivatization technique for the combination of high-performance liquid chromatography (HPLC) and atomic absorption spectrometry (AAS) detection. Two model elements arsenic and mercury and their compounds were selected for the speciation analysis. The work was divided into several parts that follow. In the first part of the research, the apparatus for the UV-photochemical generation of the volatile mercury compounds and their detection with a new continuum source and high-resolution atomic absorption spectrometer (HR-CS AAS) with an externally heated detection tube was constructed. The analytical method was adapted for use with atomic fluorescence detection with the aim to improve sensitivity of the determination. Furthermore, apparatus for the electrochemical generation of cold mercury vapor with AAS detection was built. The construction of the apparatus was followed by optimization of the reaction conditions (concentration and flow of electrochemical reagents: sulfuric and hydrochloric acid, mobile phase, carrier medium, flow rate of the carrier gas and localization of its introduction), determination of the analytical figures of merit, and comparation of the methods. Both...
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Book chapters on the topic "UV-photochemical reactor"

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Nishikubo, T., A. Kameyama, and H. Kudo. "Synthesis and Photochemical Reaction of High-Performance UV-Curing Oligomers." In ACS Symposium Series, 363–77. Washington, DC: American Chemical Society, 2003. http://dx.doi.org/10.1021/bk-2003-0847.ch031.

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Rather, Gulzar Ahmed, Arghya Chakravorty, Basharat Ahmad Bhat, Ishfaq Majeed Malik, Fayaz Hussain Mir, Siva Sankar Sana, Vimala Raghavan, Anima Nanda, and Moharana Choudhury. "Routes of Synthesis and Characterizations of Nanoparticles." In Applications of Nanomaterials in Agriculture, Food Science, and Medicine, 288–309. IGI Global, 2021. http://dx.doi.org/10.4018/978-1-7998-5563-7.ch016.

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An interesting aspect of nanotechnology is the remarkable size-dependent physico-chemical properties of nanomaterials that have led to the rise of synthesis procedures for nanomaterials across a range of sizes, shapes, and chemical compositions. This chapter will concentrate on the different methods such as electron irradiation, laser ablation, and chemical reduction, biological methods, photochemical methods; microwave processing, chemical vapour condensation (CVC), arc discharge, hydrogen plasma-metal reaction, and laser pyrolysis in the vapour phase. This chapter will also include the various characterization techniques for the conformation of nanomaterials such as UV-visible spectroscopy, x-ray diffraction, and electron microscopy (e.g., transmission electron microscopy [TEM], scanning electron microscopy [SEM], and atomic force microscopy [AFM]).
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Conference papers on the topic "UV-photochemical reactor"

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Lepeytre, C., C. Lavaud, and G. Serve. "Photocatalytic and Photochemical Degradation of Liquid Waste Containing EDTA." In ASME 2011 14th International Conference on Environmental Remediation and Radioactive Waste Management. ASMEDC, 2011. http://dx.doi.org/10.1115/icem2011-59144.

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The decontamination factor of liquid waste containing 60Co is generally weak. This is due to the presence of complexant molecules. For instance, complexation of EDTA with 60Co decreases efficiency of radioactive waste treatment. The aim of this study was to degrade EDTA in H2O and CO2 and to concentrate free 60Co in order to increase decontamination factor. A first test of radioactive waste treatment by photocatalysis was allowed to increase decontamination factor (60Co) from 16 to 196 with a device requiring to be improved. The present work concerns the first step of the degradation process development with a more powerful device. These first experiments were leaded to follow the only EDTA oxidation. EDTA degradation was carried out by the following Advanced Oxidation Processes (AOP): UV/H2O2 (photochemistry); UV/TiO2 (photocatalysis); UV/TiO2/H2O2. A specific reactor was achieved for this study. The wavelength used was 254 nm (UVC). The photocatalytic degradation of EDTA was carried out with Degussa P-25 titanium dioxide (TiO2), which is a semiconductor photocatalyst. The degradation degree of EDTA and the intermediate products were monitored by TOC and ionic chromatography methods. The effects of various parameters such as pH and the quantity of H2O2 were studied. This allows us to conclude that basic pH slows down EDTA degradation. The study showed that UV/H2O2 process was the most effective treatment process under acid conditions. The rate of EDTA degradation was very high and reached 95% in 120 minutes. The presence of glyoxilic, oxalic, glycolic and formic acids was detected as degradation products. Among the intermediates produced by photochemistry, NO3− ions presence informed of the amine degradations. These results highlighted faster EDTA degradation by photochemistry than photocatalysis.
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Reports on the topic "UV-photochemical reactor"

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Wurl, Oliver. Biofilm-like habitat at the sea-surface: A mesocosm study, Cruise No. POS537, 14.09.2019 – 04.10.2019, Malaga (Spain) – Cartagena (Spain) - BIOFILM. University of Oldenburg, November 2020. http://dx.doi.org/10.3289/cr_pos537.

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OceanRep OceanRep Startseite Kontakt Schnellsuche Einfache Suche Erweiterte Suche Blättern Autor Forschungsbereich Publikationsart Jahr Studiengang Neuzugänge Artikel – begutachtet Alle Über uns GEOMAR Bibliothek Open Access Policies Grundsätze Hilfe FAQs Statistik Impressum Biofilm-like habitat at the sea-surface: A mesocosm study, Cruise No. POS537, 14.09.2019 – 04.10.2019, Malaga (Spain) – Cartagena (Spain) - BIOFILM . Logged in as Heidi Düpow Einträge verwaltenManage recordsManage shelvesProfilGespeicherte SuchenBegutachtungAdminLogout - Tools Wurl, Oliver, Mustaffa, Nur Ili Hamizah, Robinson, Tiera-Brandy, Hoppe, Jennifer, Jaeger, Leonie, Striebel, Maren, Heinrichs, Anna-Lena, Hennings, Laura Margarethe, Goncalves, Rodrigo, Ruiz Gazulla, Carlota und Ferrera, Isabel (2020) Biofilm-like habitat at the sea-surface: A mesocosm study, Cruise No. POS537, 14.09.2019 – 04.10.2019, Malaga (Spain) – Cartagena (Spain) - BIOFILM . Open Access . POSEIDON Berichte . University of Oldenburg, Oldenburg, 35 pp. [img] Text Cruise_Reports_POS537_final.pdf - publizierte Version Available under License Creative Commons: Attribution 4.0. Download (2417Kb) | Vorschau Abstract Biofilm-like properties can form on sea surfaces, but an understanding of the underlying processes leading to the development of these biofilms is not available. We used approaches to study the development of biofilm-like properties at the sea surface, i.e. the number, abundance and diversity of bacterial communities and phytoplankton, the accumulation of gel-like particles and dissolved tracers. During the expedition POS537 we used newly developed and free drifting mesocosms and performed incubation experiments. With these approaches we aim to investigate the role of light and UV radiation as well as the microbes themselves, which lead to the formation of biofilms. With unique microbial interactions and photochemical reactions, sea surface biofilms could be biochemical reactors with significant implications for ocean and climate research, e.g. with respect to the marine carbon cycle, diversity of organisms and oceanatmosphere interactions.
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