Relevant bibliographies by topics / UV-photoreactor

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

Academic literature on the topic 'UV-photoreactor'

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

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Journal articles on the topic "UV-photoreactor"

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Mehrvar, M., W. A. Anderson, and M. Moo-Young. "Comparison of the photoactivities of two commercial titanium dioxide powders in the degradation of 1,4-dioxane." International Journal of Photoenergy 4, no. 4 (2002): 141–46. http://dx.doi.org/10.1155/s1110662x02000168.

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Two different commercial photocatalysts, Degussa P25 and Hombikat UV 100, were used to degrade 1,4-dioxane photocatalytically in an annular slurry photoreactor. The optimum photocatalyst loading for Degussa P25 was found to be1.5gL-1while for Hombikat UV 100 was between3.0−4.0gL-1. The photoactivity of Degussa P25 is higher than that of Hombikat at lower photocatalyst loadings whereas it is lower at higher photocatalyst loadings. This was found both experimentally and also by mathematical modeling of the radiation within the photoreactor zone. The photoactivity of UV 100 titanium dioxide was found to be twice that of Degussa P25 at optimum loadings.
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Danyliuk, N. V., T. R. Tatarchuk, and A. V. Shyichuk. "Batch microreactor for photocatalytic reactions monitoring." Physics and Chemistry of Solid State 21, no. 2 (June 15, 2020): 338–46. http://dx.doi.org/10.15330/pcss.21.2.338-346.

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Photocatalytic oxidation of organic contaminants is a hot topic in environmental research. However, an effective purification process needs an effective photoreactor. Typical light sources such as mercury and halogen lamps are replaced with more energy efficient Light Emitting Diodes. In the current work, a miniature photoreactor with low catalyst consumption was presented. The work of the micro-photoreactor is investigated using anatase and P25 industrial titania as model catalysts. The key element of the microreactor is replaceable UV-LED. The used 365 nm emission wavelength is optimal for the model pollutant Rhodamine B dye. The micro-photoreactor is able to mineralize the Rhodamine B dye almost completely.
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Bianchi, C. L., C. Pirola, F. Galli, S. Vitali, A. Minguzzi, M. Stucchi, F. Manenti, and V. Capucci. "NOxdegradation in a continuous large-scale reactor using full-size industrial photocatalytic tiles." Catalysis Science & Technology 6, no. 7 (2016): 2261–67. http://dx.doi.org/10.1039/c5cy01627d.

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Atheba, Patrick, Didier Robert, Albert Trokourey, Drissa Bamba, and Jean-Victor Weber. "Design and study of a cost-effective solar photoreactor for pesticide removal from water." Water Science and Technology 60, no. 8 (October 1, 2009): 2187–93. http://dx.doi.org/10.2166/wst.2009.640.

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In order to remove pesticides from water, a basic photoreactor has been built. We evaluated the performance of this photoreactor using two commercial photocatalytic materials from Ahlstrom group and from Saint-Gobain, with solar and artificial UV-lamps. We compared the kinetics of photocatalytic degradation and mineralization of Diuron in the same reactor with of both photocatalyst supports. We showed that Diuron is easily degraded under solar or artificial irradiation, while the kinetics of mineralization in the same condition are very slow. The behaviour of these commercial materials has been studied after several uses in the same conditions. We showed the effectiveness of this basic and cheap photoreactor for the elimination of pesticide in water.
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Behnajady, Mohammad A., Sadegh Amirmohammadi-Sorkhabi, Nasser Modirshahla, and Mohammad Shokri. "Investigation of the efficiency of a tubular continuous-flow photoreactor with supported titanium dioxide nanoparticles in the removal of 4-nitrophenol: operational parameters, kinetics analysis and mineralization studies." Water Science and Technology 64, no. 1 (July 1, 2011): 56–62. http://dx.doi.org/10.2166/wst.2011.666.

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In this study, to investigate the application of heterogeneous photocatalysis in the removal of organic contaminants from aqueous media a novel tubular continuous-flow photoreactor with supported TiO2-P25 on glass plates was designed and constructed. The photoreactor comprises six quartz tubes and a UV lamp which was placed in the center of the quartz tubes. 4-nitrophenol (4-NP) as a most refractory pollutant was chosen as a probe pollutant to examine the photoreactor efficiency for environmental cleaning applications. Results of experiments show that the removal efficiency of 4-NP in this photoreactor is a function of photoreactor length, gas and liquid flow rates and 4-NP initial concentration. Kinetics analysis indicates that degradation of 4-NP in continuous-mode can be modeled with the Langmuir–Hinshelwood (L–H) model (kL–H = 1.5 mg L−1 min−1, Kads = 0.11 mg−1 L). A design equation was obtained with a combination of L–H modified equation and tubular reactor design equation. This equation can be used for estimation of 4-NP concentration in different photoreactor lengths under various operational parameters. Mineralization study was followed through total organic carbon (TOC) analysis and measurement of nitrite and nitrate as final degradation products.
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Ciambelli, Paolo, Diana Sannino, Vincenzo Palma, Vincenzo Vaiano, and Roberto S. Mazzei. "Improved Performances of a Fluidized Bed Photoreactor by a Microscale Illumination System." International Journal of Photoenergy 2009 (2009): 1–7. http://dx.doi.org/10.1155/2009/709365.

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The performances of a gas-solid two-dimensional fluidized bed reactor in photocatalytic selective oxidation reactions, irradiated with traditional UV lamps or with a microscale illumination system based on UV emitting diodes (UVA-LEDs), have been compared. In the photocatalytic oxidative dehydrogenation of cyclohexane to benzene on catalyst the use of UVA-LEDs modules allowed to achieve a cyclohexane conversion and benzene yield higher than those obtained with traditional UV lamps. The better performances with UVA-LEDs are due to the UVA-LEDs small dimensions and small-angle emittance, which allow photons beam be directed towards the photoreactor windows, reducing the dispersion outside of photoreactor or the optical path length. As a consequence, the effectively illuminated mass of catalyst is greater. We have found that this illumination system is efficient for photo-oxidative dehydrogenation of cyclohexane to cyclohexene on sulphated and ethanol to acetaldehyde on .
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Ghanbari, Sina, Mohammad Hadi Givianrad, and Parviz Aberoomand Azar. "Simultaneous reduction of Cr (VI) and degradation of azo dyes by F-Fe-codoped TiO2/SiO2 photocatalysts under visible and solar irradiation." Canadian Journal of Chemistry 97, no. 9 (September 2019): 659–71. http://dx.doi.org/10.1139/cjc-2018-0529.

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A new TiO2/SiO2 photocatalyst codoped with fluorine and iron was synthesized using the sol–gel process and immobilized onto glass beads by coupling two methods of dip coating and heat attachment. The prepared samples were characterized by XRD, FTIR, DRS-UV–vis, FESEM, EDX, TEM, and N2 adsorption–desorption analysis. The effective parameters of pH, flow rate, and photoreactor vessels’ angle against solar irradiation on degradation performance were optimized. Subsequently, the photocatalytic activity of the prepared nanocomposites was investigated in an innovative fabricated photoreactor using a four-component pollutant mixture of Cr (VI), basic red 29, basic blue 41, and basic yellow 51 under visible and solar irradiation. Furthermore, the effectiveness of photoreactor performance was assessed under various outdoor climate conditions as natural irradiation sources. Consequently, UV–vis spectrophotometry results showed significant efficiency of photocatalytic removal of the pollutant mixture. TOC results of 74.39% and 78.04% for removal of organic content of the sample under visible and solar light, respectively, were also confirmed the great capability of the designed system for the simultaneous removal of some hazardous inorganic and organic contaminants under natural light sources.
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Alves, C. V. P., C. A. L. Chernicharo, and M. von Sperling. "UV disinfection of stabilization pond effluent: a feasible alternative for areas with land restriction." Water Science and Technology 65, no. 2 (January 1, 2012): 247–53. http://dx.doi.org/10.2166/wst.2012.363.

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The purpose of this research was to determine the feasibility of a UV photoreactor for the disinfection of effluent from a polishing pond following a UASB reactor treating domestic wastewater. For this, a 20 mm diameter photoreactor (20.7 litre volume) equipped with four 30 W submerged low-pressure mercury arc lamps was used. Three tests with contact times and doses ranging from 45 to 90 s and from 16.9 to 31.3 mW s cm−2 were carried out. Inactivation of total coliforms and Escherichia coli varied from 2.6 to 3.4 log-units, even with the presence of suspended solids in the range of 87 to 102 mg L−1. These results have shown that UV radiation disinfection of pond effluents can be a feasible alternative in areas with land restriction.
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de Lemos Chernicharo, C. A., J. C. de Castro Silva, A. M. Zerbini, and V. M. Godinho. "Inactivation of E. coli and helminth eggs in aerobic and anaerobic effluents using UV radiation." Water Science and Technology 47, no. 9 (May 1, 2003): 185–92. http://dx.doi.org/10.2166/wst.2003.0521.

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This paper evaluates the performance of a simplified bench-scale UV-photoreactor used to inactivate Escherichia coli and eggs of Ascaris lumbricoides. The photoreactor consisted of a tubular unit constructed with PVC tube, 100 mm diameter and 45 cm total height, with a low-pressure mercury lamp adapted in the centre of the tube. The reactor was tested to disinfect the effluents from a trickling filter and from an UASB reactor, both fed with domestic sewage. The results showed an excellent performance of the photoreactor, with very high E. coli inactivation efficiencies being observed for the aerobic effluent (in the range of 4 to 5 log-units, for doses varying from 50.7 to 13.6 mW.s.cm−2) and also for the effluent from the UASB reactor (usually above 4 log-units, for doses of 20.3 and 13.6 mW.s.cm−2). In relation to the inactivation of helminth eggs, it was observed that UV radiation significantly affected the development of eggs of Ascaris lumbricoides, with the better results being obtained for radiation times of 40 and 60 seconds (doses of 13.6 and 20.3 mW.s.cm−2, respectively), when approximately 65% of the eggs remained in the stage of single cell and only 9 to 10% were able to fully develop to the stage of motile larva.
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Jeon, Hwa-Bong, Jung-Won Yun, and Sung-Hong Kim. "Optical characteristics of the UV intensity distribution in a non-contact type UV photoreactor." Journal of Korean Society of Water and Wastewater 26, no. 2 (April 16, 2012): 257–64. http://dx.doi.org/10.11001/jksww.2012.26.2.257.

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Dissertations / Theses on the topic "UV-photoreactor"

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Elyasi, Siamak. "Developmemt of UV photoreactor models for water treatment." Thesis, University of British Columbia, 2009. http://hdl.handle.net/2429/15251.

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Ultraviolet (UV) reactors are promising for the future of drinking water and wastewater treatment technology. Models simulating the performance of UV reactors enhance our understanding of the fundamental principles governing the operation of these units. When modeling the performance of UV reactors, governing equations for all related phenomena are derived and solved. The theoretical models and experimental approaches for evaluating the results of these models are comprehensively reviewed and presented in this research. The thesis presents a step-by-step methodology for solving the governing equations of UV reactors. This research presents a general method that integrates the Fresnell, Snell, and Beer-Lambert laws for modeling the radiant distribution in a medium. The model uses the boundary conditions to realistically simulate the fluence/irradiance rate around the radiant source, in particular, in the zone closest to the radiant source. Different low-pressure UV lamps were tested under different operating conditions using photodiodes and a radiometer. The experimentally measured irradiance rate is in excellent agreement with the results of the simulation. Conventionally, the performance of a UV reactor is evaluated using the concentration of photoreactive chemicals at the outlet vs. the inlet. This research presents a novel method for measuring the concentration distribution of a photoreactive chemical inside a photoreactor using a modified planar laser-induced fluorescence method. The fluence distribution was measured for a pilot scale photoreactor under different operating conditions. The visualized result of the fluence distribution revealed significant information about the local/overall performance of the photoreactor. This method is a powerful diagnostic tool for the determination of the local performance inside a UV reactor, as well as for the evaluation of models simulating UV reactor behavior. A computational fluid dynamic (CFD) model was developed in order to simulate UV photoreactors in the Eulerian framework for microbial disinfection and chemical removal using a UV-based hydroxyl radical initiated oxidation process. The integrated CFD model of UV photoreactor performance was successfully validated by comparisons with experimental results. This verified procedure can be applied to the simulation and optimization of UV photoreactors with different geometries and operating conditions.
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Lin, Chi-Chang, and 林奇璋. "The Study on the Photoreactor Design for the Treatment of Dye Wastewaters by UV/O3 Process." Thesis, 2002. http://ndltd.ncl.edu.tw/handle/31165531970817614792.

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碩士
大葉大學
環境工程研究所
90
The purpose of this study is to develop the design equations of an annular photoreactor for the treatment of dye wastewaters by various advanced oxidation processes. The UV/O3 and UV/H2O2/O3 processes are applied to treat the dye wastewaters to investigate the removal characteristics of pollutants and evaluate the treatment efficiencies of AOPs. The photoreactor design equation was established by combining with the chemical kinetics of the photooxidation systems, empirical rate expression of oxidants and dye pollutants, and UV light distribution model in the photoreactor, and was used to predict the decomposition of pollutants (Reactive Red 141, Acid Blue 62 and Direct Yellow 86) within photoreactor of geometries at various operating conditions (hydraulic retention times, solution pH values, UV light intensities, initial concentrations of dyes, and dosages of oxidants ) to verify its rationality and feasibility. The decoloration rate of dyes in aqueous solutions was found to increase with the increasing of UV light intensity and dosage of oxidants, and with decreasing of solution pH value and the ri/ro ratio of photoreactor. The order of the decomposition rates of dyes by UV/O3 process is Blue 62＞Red 141＞Yellow 86, and Red 141＞Blue 62＞Yellow 86 by UV/H2O2/O3 process. The photoreactor design equation developed was found reasonablely to predict reaction behaviors of dyes at various operating conditions and distribution profile within photoreactor. The results of this research can be as useful bases of the future application of the UV-based advanced oxidation processes.
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Wang, Wen, and 王. 文. "Novel Optical Fiber Photoreactor for the Decomposition of Gaseous Benzene in Air Stream by UV/TiO2 Process." Thesis, 2003. http://ndltd.ncl.edu.tw/handle/rbm6f5.

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博士
國立臺灣科技大學
化學工程系
91
Batch and continuous-flow differential optical fiber photoreactors were developed for the photocatalytic oxidation of gaseous benzene in air stream. The surface properties (coverage, roughness and thickness) of the coated TiO2 layer on optical fiber were characterized by SEM micrographs. For TiO2 layer prepared from solutions containing less than 20wt% of TiO2, the thickness of layer was increased linearly with the TiO2 slurry content in solutions. The UV light intensity transmitted along a TiO2 coated optical fiber decreased more rapidly than that transmitted along a non-coated fiber. Based on the experimental results, the light intensity distribution around the coated optical fiber was modeled to determine the optimum configuration for the design of optical fiber reactors under various operational conditions. The experimental results indicate that applied UV light intensity, initial concentration benzene and humidity are the main factors effecting the decomposition of benzene during UV/TiO2 process. The deactivation of TiO2 photocatalyst observed during the reaction was possibly caused by the competing adsorption of organic intermediates, which were identified by FTIR/ATR and GC/MS. The mechanism and pathway of benzene decomposition were proposed as the consecutive rupture of aromatic ring and breakage of the C-C, C=C, CºC or other kinds of bonding related to intermediates. A reactor design equation combined the UV light intensity profile of TiO2 coated fiber and the empirical kinetic expression for the photocatalysis of gaseous benzene was solved numerically and then used to predict the decomposition of benzene within the optical fiber photoreactor at various operating conditions. Experimentally observed conversion of gaseous benzene in the continues-flow differential-type optical fiber photoreactor agreed well with the theoretical solutions modeled by the photoreactor design equation developed via the modified Langmuir-Hinshelwood kinetic expression coupling with continuity equation. The geometry and configuration of optical fiber photoreactors was proposed in this study that a disk-shaped reactor with multi-fiber structure was recommend for further application.
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王冠中. "The study on the photoreactor design for the treatment of dye and isopropanol wastewaters by a recycled UV/H2O2 process." Thesis, 2003. http://ndltd.ncl.edu.tw/handle/69807785889527297538.

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碩士
大葉大學
環境工程學系碩士班
91
The purpose of this study is to develop the design equations of a continuous annular photoreactor for the treatment of organic wastewaters by a homogeneous phase AOP (presented as a recycled-type UV/H2O2 process). The research scope is to treat organic (dyes and lsopropylalcohol) wastewaters by a recycled-type UV/H2O2 process to investigate the removal characteristics of pollutants and evaluate the treatment efficiencies based on my relative works of previous two years. It is intended to recycle the excessive H2O2 to obtain optimum utilization of the oxidant under various operation conditions (e.g. reflux ratios). The specific design equations of the photoreactor for the photooxidation systems will be developed and assessed for various types of pollutants. A Fluent 5.0 software of the computational fluid dynamics (CFD) is used to describe the steady state distribution of the fluid fields within the photoreactor to correlate the treatment efficiency of pollutants. The photoreactor design equation was established by combining with the chemical kinetics of the photooxidation systems, empirical rate expression of oxidants and dye pollutants, and UV light distribution model in the photoreactor, and was used to predict the decomposition of pollutants (Reactive Red 141 and IPA) within photoreactor of geometries at various operating conditions (hydraulic retention times, solution pH values, UV light intensities, initial concentrations of dyes, and dosages of oxidants) to verify its rationality and feasibility. The photoreactor design equation developed was found reasonablely to predict reaction behaviors of dyes at various operating conditions and distribution profile within photoreactor. The results of this research can be as useful bases of the future application of the UV-based advanced oxidation processes. Keywords: advanced oxidation processes (AOPs), design equation of photoreactor, recycled reactor, UV/H2O2 process, computational fluid dynamics (CFD), dye wastewater, IPA
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蔡名威. "Development of On-line HPLC-UV/nano-TiO2 thin-film photoreactor-pre-reduction-HG-ICP-MS system for determination of arsenic species in biological samples." Thesis, 2005. http://ndltd.ncl.edu.tw/handle/03612170440396428745.

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Rybínová, Marcela. "UV-fotochemické generování těkavých sloučenin selenu pro potřeby ultrastopové analýzy metodou AAS." Doctoral thesis, 2016. http://www.nusl.cz/ntk/nusl-353427.

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This thesis deals with the study of UV-photochemical generation of volatile compounds (UV-PVG) in connection with atomic absorption spectrometry (AAS). Selenium (Se(IV)) was selected as a model analyte and many experiments were carried out to expand the current sum of knowledge of the topic. The study was commenced by assembling the UV-PVG apparatus in the continuous flow mode. The detection method used was AAS with externally heated quartz furnace atomizer. The focus of the first step of the study was on the construction of the volatile compounds generator (UV-photoreactor) with emphasis on the material used; tubes made of teflon or quartz of different diameters were tested. The construction of the apparatus was followed by optimization of the reaction conditions (the type and concentration of the photochemical agent and other agents, which increase the analytical signal; the carrier gas and the auxiliary hydrogen gas flow rate; the sample flow rate). Eventually, the analytical figures of merit of the selenium determination using the proposed method were found. The results showed that teflon reaction tubes are a good competitor to those made of quartz. The accuracy of the method has been successfully verified by analysis of certified reference material and its applicability has been further tested...
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Book chapters on the topic "UV-photoreactor"

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Zhang, Yiqing, and Teik-Thye Lim. "Photodegradation of Cytostatic Drugs in Low-Pressure UV Photoreactor Through Direct and Indirect Pathways." In Fate and Effects of Anticancer Drugs in the Environment, 245–57. Cham: Springer International Publishing, 2020. http://dx.doi.org/10.1007/978-3-030-21048-9_11.

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Conference papers on the topic "UV-photoreactor"

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Boutra, B., L. Aoudjit, F. Madjene, A. Sebti, H. Lebik, and S. Igoud. "Measurement and modeling of UV intensity inside a photoreactor for wastewater treatment." In the The International Conference. New York, New York, USA: ACM Press, 2015. http://dx.doi.org/10.1145/2832987.2833008.

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Lin, Yi Ping, Mehrab Mehrvar, and Ramdhane Dhib. "ARX-PID/NARX-PID Modelling and Control of UV/H2O2 Tubular Photoreactor for PVA Degradation in Water." In The 5th International Conference of Recent Trends in Environmental Science and Engineering (RTESE'21). Avestia Publishing, 2021. http://dx.doi.org/10.11159/rtese21.303.

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Vijayaraghavan, Sanjay, and D. Y. Goswami. "Photocatalytic Oxidation of Toluene in Water From an Algae Pond With High Dissolved Oxygen Content." In ASME Solar 2002: International Solar Energy Conference. ASMEDC, 2002. http://dx.doi.org/10.1115/sed2002-1061.

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Water in well-mixed ponds containing photosynthetic algae has been observed to have an extremely high Dissolved Oxygen (DO) content. Up to four times saturation levels of DO have been recorded. Since DO is known to have an important role in the photocatalytic oxidation of organic contaminants in water, it was hypothesized that a faster rate of contaminant destruction would be observed in water drawn from algae ponds supersaturated with DO. In order to verify this hypothesis a bench scale, batch type photoreactor was constructed. Some baseline tests were performed to investigate the influence of UV intensity, water pH and DO content on the photocatalytic destruction of toluene in water. An array of ultraviolet “blacklight” lamps in a lamp box was used to simulate solar ultraviolet radiation. First-order reaction rate constants were calculated from the destruction data, using a kinetic model proposed earlier. The reaction was found to proceed forward equally fast at pH 4 and 10. A power law relation was derived for the reaction rate dependence on UV intensity. Presence of DO in the water was found to be required for the reaction to go forward. Water from an algae pond, supersaturated with dissolved oxygen was spiked with toluene and destruction tests were then conducted in the same reactor. These tests did not show the expected improvement in destruction rates.
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Muradov, Nazim Z., and Ali T-Raissi. "Solar Production of Hydrogen Using “Self-Assembled’’ Polyoxometalate Photocatalysts." In ASME 2005 International Solar Energy Conference. ASMEDC, 2005. http://dx.doi.org/10.1115/isec2005-76071.

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Near-term and cost-effective production of solar hydrogen from inexpensive and readily available hydrogen containing compounds (HCCs) can boost the prospects of future hydrogen economy. In this paper, we assess the prospects of solar-assisted conversion of HCCs into hydrogen using polyoxometalate (POM) based photocatalysts, such as isopolytunstates (IPT) and silicotungstic acid (STA). Upon exposure to solar photons, IPT aqueous solutions containing various HCCs (e.g. alcohols, alkanes, organic acids, sugars, etc.) produce hydrogen gas and corresponding oxygenated compounds. The presence of small amounts of colloidal platinum increases the rate of hydrogen evolution by one order of magnitude. A solar photocatalytic flat-bed reactor, approximately 1.2 m × 1.2 m in size, was fabricated and tested for production of hydrogen from water-alcohol solutions containing IPT and STA and small amounts of colloidal Pt. The solar photoreactor tests demonstrated steady-state production of hydrogen gas for several days. IPT immobilized on granules of anion exchange resins with quaternary ammonium active groups show good photocatalytic activity for hydrogen production from water-alcohol solutions exposed to near-UV or solar radiation.
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