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  1. Article: Radiation modeling of microplasma UV lamps for design analysis and optimization.

    Mohaghegh Montazeri, Mahyar / Raeiszadeh, Milad / Taghipour, Fariborz

    Journal of environmental chemical engineering

    2023  Volume 11, Issue 3, Page(s) 110040

    Abstract: Microplasma UV lamps have recently emerged as viable excimer-based sources of UV radiation, garnering significant attention during the recent COVID-19 pandemic for their use in disinfection applications because of their ability to emit human-safe far-UVC ...

    Abstract Microplasma UV lamps have recently emerged as viable excimer-based sources of UV radiation, garnering significant attention during the recent COVID-19 pandemic for their use in disinfection applications because of their ability to emit human-safe far-UVC (200-240 nm) spectrums. An accurate model to simulate the radiation profile of microplasma UV lamps is of paramount importance to develop efficient microplasma lamp-implemented systems. We developed a 3D numerical model of microplasma UV lamps using the ray optics method. The simulation results for lamp irradiance and fluence rate were experimentally validated with standard optical radiometry and actinometry measurements, respectively. To improve the optical efficiency of microplasma lamps, an in-depth analysis of radiation behavior inside the standard commercially available lamp was performed using the geometrical optics method, and several potential scenarios were explored. A 2D modeling of an individual microcavity indicated that the current common lamp design can be significantly improved by preventing radiation loss, and small modifications in optical design can greatly increase the energy performance of the system. Based on the findings of this study, several virtual design concepts were proposed, and their performances were numerically compared with that of the original design of commercial microplasma lamps. The developed model can potentially be integrated with hydrodynamic and kinetic models for the virtual prototyping of complex photoreactors operating with UV microplasma lamps.
    Language English
    Publishing date 2023-05-05
    Publishing country Netherlands
    Document type Journal Article
    ISSN 2213-2929
    ISSN 2213-2929
    DOI 10.1016/j.jece.2023.110040
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  2. Article: A Critical Review on Ultraviolet Disinfection Systems against COVID-19 Outbreak: Applicability, Validation, and Safety Considerations.

    Raeiszadeh, Milad / Adeli, Babak

    ACS photonics

    2020  Volume 7, Issue 11, Page(s) 2941–2951

    Abstract: The global health-threatening crisis from the COVID-19 pandemic, caused by the severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2), highlights the scientific and engineering potentials of applying ultraviolet (UV) disinfection technologies for ... ...

    Abstract The global health-threatening crisis from the COVID-19 pandemic, caused by the severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2), highlights the scientific and engineering potentials of applying ultraviolet (UV) disinfection technologies for biocontaminated air and surfaces as the major media for disease transmission. Nowadays, various environmental public settings worldwide, from hospitals and health care facilities to shopping malls and airports, are considering implementation of UV disinfection devices for disinfection of frequently touched surfaces and circulating air streams. Moreover, the general public utilizes UV sterilization devices for various surfaces, from doorknobs and keypads to personal protective equipment, or air purification devices with an integrated UV disinfection technology. However, limited understanding of critical UV disinfection aspects can lead to improper use of this promising technology. In this work, fundamentals of UV disinfection phenomena are addressed; furthermore, the essential parameters and protocols to guarantee the efficacy of the UV sterilization process in a human-safe manner are systematically elaborated. In addition, the latest updates from the open literature on UV dose requirements for incremental log removal of SARS-CoV-2 are reviewed remarking the advancements and existing knowledge gaps. This study, along with the provided illustrations, will play an essential role in the design and fabrication of effective, reliable, and safe UV disinfection systems applicable to preventing viral contagion in the current COVID-19 pandemic, as well as potential future epidemics.
    Language English
    Publishing date 2020-10-14
    Publishing country United States
    Document type Journal Article ; Review
    ISSN 2330-4022
    ISSN 2330-4022
    DOI 10.1021/acsphotonics.0c01245
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  3. Article ; Online: Microplasma UV lamp as a new source for UV-induced water treatment: Protocols for characterization and kinetic study.

    Raeiszadeh, Milad / Taghipour, Fariborz

    Water research

    2019  Volume 164, Page(s) 114959

    Abstract: The newly emerged microplasma UV radiating technology can be a viable alternative to conventional radiation sources for UV water treatment. The capability of the microplasma UV lamp to monochromatically irradiate various wavelengths with different ... ...

    Abstract The newly emerged microplasma UV radiating technology can be a viable alternative to conventional radiation sources for UV water treatment. The capability of the microplasma UV lamp to monochromatically irradiate various wavelengths with different pulsation frequencies in a flat form opens new pathways for the development of novel UV-based water purifiers. This study is the first to systematically examine the microplasma UV lamp and develop a robust experimental method and apparatus for its operation to study the kinetics of both microbial and chemical pollutant degradation. The microplasma UV lamp was characterized in terms of its radiation profile and the impact of operating parameters on the lamp radiant power output. It was shown to be an instant-on and fast stabilized source. The radiant power output was a linear function of the electrical current and was not influenced by the lamp operating temperature and intermittent on/off cycles. A protocol was developed for obtaining reliable kinetic data for UV-induced elimination of microorganisms and micropollutants. An experimental setup was proposed for the kinetic studies, where the characteristics of the incident irradiance of the lamp, including uniformity, collimation, and divergence, were quantitatively evaluated. In addition, the water factor (WF) for calculating the average fluence rate was redefined for both the transient and steady state conditions. This modification is essential to account for changes in the UV transmittance of the medium, which could be an important factor for kinetic study of chemical contaminants. Two studied cases of microbial direct inactivation and the chemical photo-initiated oxidation process in different setups, based on the developed protocol, confirmed the reproducibility of the fluence-based kinetic data independent of the reactor size. The proposed protocol can be applied to the kinetic study of the elimination of microbial and chemical contaminants using microplasma UV lamps of any size, power, and peak wavelength.
    MeSH term(s) Kinetics ; Reproducibility of Results ; Ultraviolet Rays ; Water ; Water Purification
    Chemical Substances Water (059QF0KO0R)
    Language English
    Publishing date 2019-08-08
    Publishing country England
    Document type Journal Article
    ZDB-ID 202613-2
    ISSN 1879-2448 ; 0043-1354
    ISSN (online) 1879-2448
    ISSN 0043-1354
    DOI 10.1016/j.watres.2019.114959
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  4. Article ; Online: A Critical Review on Ultraviolet Disinfection Systems against COVID-19 Outbreak

    Raeiszadeh, Milad / Adeli, Babak

    ACS Photonics ; ISSN 2330-4022 2330-4022

    Applicability, Validation, and Safety Considerations

    2020  

    Keywords covid19
    Language English
    Publisher American Chemical Society (ACS)
    Publishing country us
    Document type Article ; Online
    DOI 10.1021/acsphotonics.0c01245
    Database BASE - Bielefeld Academic Search Engine (life sciences selection)

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  5. Article ; Online: Microplasma UV lamp as a new source for UV-induced water treatment: Protocols for characterization and kinetic study

    Raeiszadeh, Milad / Taghipour, Fariborz

    Water research. 2019 Nov. 01, v. 164, p. 114959

    2019  , Page(s) 114959

    Abstract: The newly emerged microplasma UV radiating technology can be a viable alternative to conventional radiation sources for UV water treatment. The capability of the microplasma UV lamp to monochromatically irradiate various wavelengths with different ... ...

    Abstract The newly emerged microplasma UV radiating technology can be a viable alternative to conventional radiation sources for UV water treatment. The capability of the microplasma UV lamp to monochromatically irradiate various wavelengths with different pulsation frequencies in a flat form opens new pathways for the development of novel UV-based water purifiers. This study is the first to systematically examine the microplasma UV lamp and develop a robust experimental method and apparatus for its operation to study the kinetics of both microbial and chemical pollutant degradation. The microplasma UV lamp was characterized in terms of its radiation profile and the impact of operating parameters on the lamp radiant power output. It was shown to be an instant-on and fast stabilized source. The radiant power output was a linear function of the electrical current and was not influenced by the lamp operating temperature and intermittent on/off cycles. A protocol was developed for obtaining reliable kinetic data for UV-induced elimination of microorganisms and micropollutants. An experimental setup was proposed for the kinetic studies, where the characteristics of the incident irradiance of the lamp, including uniformity, collimation, and divergence, were quantitatively evaluated. In addition, the water factor (WF) for calculating the average fluence rate was redefined for both the transient and steady state conditions. This modification is essential to account for changes in the UV transmittance of the medium, which could be an important factor for kinetic study of chemical contaminants. Two studied cases of microbial direct inactivation and the chemical photo-initiated oxidation process in different setups, based on the developed protocol, confirmed the reproducibility of the fluence-based kinetic data independent of the reactor size. The proposed protocol can be applied to the kinetic study of the elimination of microbial and chemical contaminants using microplasma UV lamps of any size, power, and peak wavelength.
    Keywords Ultraviolet ; UV ; Microplasma ; Characterization ; Protocol ; Water treatment
    Language English
    Dates of publication 2019-1101
    Size p. 114959
    Publishing place Elsevier Ltd
    Document type Article ; Online
    ZDB-ID 202613-2
    ISSN 1879-2448 ; 0043-1354
    ISSN (online) 1879-2448
    ISSN 0043-1354
    DOI 10.1016/j.watres.2019.114959
    Database NAL-Catalogue (AGRICOLA)

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    In stock of ZB MED Bonn / Germany

    Z 78/260: Show issues
    Z 3381: Show issues

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  6. Article: A Critical Review on Ultraviolet Disinfection Systems against COVID-19 Outbreak: Applicability, Validation, and Safety Considerations

    Raeiszadeh, Milad / Adeli, Babak

    ACS Photonics

    Abstract: The global health-threatening crisis from the COVID-19 pandemic, caused by the severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2), highlights the scientific and engineering potentials of applying ultraviolet (UV) disinfection technologies for ... ...

    Abstract The global health-threatening crisis from the COVID-19 pandemic, caused by the severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2), highlights the scientific and engineering potentials of applying ultraviolet (UV) disinfection technologies for biocontaminated air and surfaces as the major media for disease transmission Nowadays, various environmental public settings worldwide, from hospitals and health care facilities to shopping malls and airports, are considering implementation of UV disinfection devices for disinfection of frequently touched surfaces and circulating air streams Moreover, the general public utilizes UV sterilization devices for various surfaces, from doorknobs and keypads to personal protective equipment, or air purification devices with an integrated UV disinfection technology However, limited understanding of critical UV disinfection aspects can lead to improper use of this promising technology In this work, fundamentals of UV disinfection phenomena are addressed;furthermore, the essential parameters and protocols to guarantee the efficacy of the UV sterilization process in a human-safe manner are systematically elaborated In addition, the latest updates from the open literature on UV dose requirements for incremental log removal of SARS-CoV-2 are reviewed remarking the advancements and existing knowledge gaps This study, along with the provided illustrations, will play an essential role in the design and fabrication of effective, reliable, and safe UV disinfection systems applicable to preventing viral contagion in the current COVID-19 pandemic, as well as potential future epidemics
    Keywords covid19
    Publisher WHO
    Document type Article
    Note WHO #Covidence: #872643
    Database COVID19

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  7. Article: Adsorptive removal of Congo red by surfactant modified cellulose nanocrystals: a kinetic, equilibrium, and mechanistic investigation

    Ranjbar, Damoon / Raeiszadeh, Milad / Lewis, Lev / MacLachlan, Mark J / Hatzikiriakos, Savvas G

    Cellulose. 2020 Apr., v. 27, no. 6

    2020  

    Abstract: A cellulose nanocrystal (CNC) based adsorbent was synthesized by modifying pristine CNC with various amounts of a positively-charged surfactant (CTAB) and was used to study the adsorption behavior of Congo red (CR) in aqueous medium. The interaction of ... ...

    Abstract A cellulose nanocrystal (CNC) based adsorbent was synthesized by modifying pristine CNC with various amounts of a positively-charged surfactant (CTAB) and was used to study the adsorption behavior of Congo red (CR) in aqueous medium. The interaction of CTAB with CNCs, and potential alterations on the chemical and physical structure of CNCs are studied, and the synthesized adsorbent, modified cellulose nanocrystal (MCNC) was characterized using Fourier transform infrared spectroscopy, X-ray diffraction, scanning electron microscopy, elemental and zeta potential analysis. The amount of surfactant used for modification was optimized to maximize the adsorption capacity of the adsorbent. Furthermore, it was found that the amount of surfactant affects the CR-MCNC interactions and determines the mechanism of adsorption. The kinetics followed a pseudo-second order and intra-particle diffusion model implying that the rate-controlling step of the adsorption process was first dominated by film-diffusion, and consequently by intra-particle diffusion. Thermodynamic studies on the system suggested that the adsorption process is spontaneous and exothermic. Characterization of the adsorbent, before and after adsorption, coupled with the kinetic and isotherm studies indicated that electrostatic attraction, hydrogen bonding, and hydrophobic attraction are the main mechanisms/interactions of adsorption. The adsorbent is highly stable in water and retains its original adsorption capacity after successive dialysis cycles.
    Keywords Fourier transform infrared spectroscopy ; X-ray diffraction ; adsorbents ; adsorption ; cellulose ; cetyltrimethylammonium bromide ; dialysis ; electrostatic interactions ; hydrogen bonding ; hydrophobicity ; models ; nanocrystals ; scanning electron microscopy ; surfactants ; zeta potential
    Language English
    Dates of publication 2020-04
    Size p. 3211-3232.
    Publishing place Springer Netherlands
    Document type Article
    ZDB-ID 1496831-9
    ISSN 1572-882X ; 0969-0239
    ISSN (online) 1572-882X
    ISSN 0969-0239
    DOI 10.1007/s10570-020-03021-z
    Database NAL-Catalogue (AGRICOLA)

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  8. Article: Investigation of 2-nitrophenol solar degradation in the simultaneous presence of K2S2O8 and H2O2: Using experimental design and artificial neural network

    Bararpour, S. Toufigh / Amin Delparish / Mehrzad Feilizadeh / Milad Raeiszadeh / Mohammad Reza Feylizadeh / Mojtaba Qanbarzadeh

    Journal of cleaner production. 2018 Mar. 01, v. 176

    2018  

    Abstract: In this study, the interaction effect of K2S2O8 (PDS) and H2O2 (as two powerful oxidants) was investigated on the solar degradation of 2-nitrophenol (2-NF) in the two systems, i.e. absence and presence of Ag/S/TiO2 photocatalyst. Experiments were ... ...

    Abstract In this study, the interaction effect of K2S2O8 (PDS) and H2O2 (as two powerful oxidants) was investigated on the solar degradation of 2-nitrophenol (2-NF) in the two systems, i.e. absence and presence of Ag/S/TiO2 photocatalyst. Experiments were designed based on the central composite design, and two methods of response surface methodology (RSM) and artificial neural network (ANN) were developed for modeling of the systems. Concentrations of PDS and H2O2 were considered as independent variables and 2-NF degradation efficiency was selected as the response. It was revealed that the predictive capacity of ANN model is more than RSM model according to their corresponding R2, R2adj, RMS, MAE, and AAD values. Therefore, ANN model was utilized to analyze the effects of the independent variables. Moreover, it was found that, by increasing the amount of either PDS or H2O2, less amount of the other oxidant was required to reach the highest degradation efficiency which shows the contributive effect of the oxidants on each other. By adding Ag/S/TiO2 visible-light-sensitive photocatalyst to the solution containing PDS and H2O2, a significant enhancement in the 2-NF degradation efficiency was observed. Using an ANN-genetic algorithm (ANN-GA) approach, the values of 172.1 mg/l and 80.9 mg/l were respectively obtained as optimum concentrations for PDS and H2O2 (in the presence of the photocatalyst). Under this condition, 2-NF degradation efficiency was predicted to be 96% after only 45 min of solar light irradiation that is in a good agreement with the actual degradation efficiency of 97.1% obtained at the optimum concentrations. In addition, the relative importance of the independent variables was studied using Garson method and it was found that PDS had more impact on the response in comparison with H2O2.
    Keywords algorithms ; experimental design ; hydrogen peroxide ; irradiation ; neural networks ; nitrophenols ; oxidants ; photocatalysts ; potassium persulfate ; response surface methodology ; silver ; solar radiation
    Language English
    Dates of publication 2018-0301
    Size p. 1154-1162.
    Publishing place Elsevier Ltd
    Document type Article
    ISSN 0959-6526
    DOI 10.1016/j.jclepro.2017.11.191
    Database NAL-Catalogue (AGRICOLA)

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