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  1. AU="Du, Roujia"
  2. AU="Colmenero-Repiso, Ana"
  3. AU="Alvarez-Carbonell, David"
  4. AU="Phelippeau, Michael"
  5. AU="Lunghi, Laura"
  6. AU=Giersiepen Klaus
  7. AU="Drobyshev, Sergey"
  8. AU="Timme, Kathleen H"
  9. AU=Sfriso Paolo
  10. AU="Kim, John S"
  11. AU=Farkash Evan A AU=Farkash Evan A
  12. AU="Xia, Xueqian"

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  1. Article ; Online: Characterization of microplastic-derived dissolved organic matter in freshwater: Effects of light irradiation and polymer types.

    Chen, Chunzhao / Du, Roujia / Tang, Jian / Wang, Bin / Li, Fei / Zhang, Zhiguo / Yu, Gang

    Environment international

    2024  Volume 185, Page(s) 108536

    Abstract: This study investigated the impacts of light irradiation and polymer types on the leaching behavior of dissolved organic matter (DOM) from microplastics (MPs) in freshwater. Polypropylene had the highest leaching capacity of DOM after photoaging, ... ...

    Abstract This study investigated the impacts of light irradiation and polymer types on the leaching behavior of dissolved organic matter (DOM) from microplastics (MPs) in freshwater. Polypropylene had the highest leaching capacity of DOM after photoaging, followed by polystyrene (PS), polyamide (PA) and polyethylene terephthalate (PET). While similarly low levels of DOM were observed in the remaining 5 MP suspensions under UV irradiation and in almost all MP suspensions (except PA) under darkness. These suggest that the photooxidation of some buoyant plastics may influence the carbon cycling of nature waters. Among 9 MP-derived leachates, PET leachates had the highest chromophoric DOM concentration and aromaticity, probably owing to the special benzene rings and carbonyl groups in PET structures and its fast degradation rate. Protein-like substances were the primary fluorescent DOM in MP suspensions (except PS), especially in darkness no other fluorescent substances were found. Considering the bio-labile properties of proteins together, MPs regardless of floating or suspended in an aquatic environment may have prevalent long-term effects on microbial activities. Besides, from monomers to hexamers with newly formed chemical bonds were identified in UV-irradiated MP suspensions. These results will contribute to a deep insight into the potential ecological effects related to MP degradation.
    MeSH term(s) Plastics ; Microplastics ; Polymers ; Dissolved Organic Matter ; Polystyrenes ; Fresh Water ; Nylons
    Chemical Substances Plastics ; Microplastics ; Polymers ; Dissolved Organic Matter ; Polystyrenes ; Nylons
    Language English
    Publishing date 2024-03-01
    Publishing country Netherlands
    Document type Journal Article
    ZDB-ID 554791-x
    ISSN 1873-6750 ; 0160-4120
    ISSN (online) 1873-6750
    ISSN 0160-4120
    DOI 10.1016/j.envint.2024.108536
    Database MEDical Literature Analysis and Retrieval System OnLINE

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    In stock of ZB MED Cologne/Königswinter

    Zs.A 3131: Show issues Location:
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  2. Article: FeOCl-confined activated carbon for improving intraparticle Fenton-like oxidation regeneration

    Zhang, Qianxin / Zhang, Menghan / Li, Tong / Du, Roujia / Yu, Gang / Deng, Shubo

    Journal of hazardous materials. 2023 Jan. 15, v. 442

    2023  

    Abstract: Highly efficient oxidation, as non-thermal regeneration technology, is a promising method to solve the regeneration problem of spent activated carbon (AC) in wastewater treatment. In this study, FeOCl was confined into activated carbon (FeOCl/AC) for ... ...

    Abstract Highly efficient oxidation, as non-thermal regeneration technology, is a promising method to solve the regeneration problem of spent activated carbon (AC) in wastewater treatment. In this study, FeOCl was confined into activated carbon (FeOCl/AC) for catalytic oxidation of contaminants on AC during the regeneration process. The characterization results of FeOCl/AC showed that amorphous FeOCl was distributed in micropores, mesopores and macropores of AC. The methylene blue (MB)-adsorbed FeOCl/AC had a regeneration efficiency of 93.7 % at neutral pH in the presence of H₂O₂, much higher than 46.9 % by Fenton oxidation and 33.7 % by H₂O₂ oxidation. Meanwhile, the spent FeOCl/AC after the adsorption of atrazine, 2,4-dichlorophenol, and ofloxacin had the regeneration efficiencies of 71.5 %, 86.4 %, and 100 %, respectively. Moreover, the regeneration efficiency still reached 87 % in the fifth adsorption-regeneration cycle, and was linearly decreased with the increase of adsorbed amounts of MB. During 6 h regeneration of spent FeOCl/AC, 97 % of adsorbed MB was degraded. Electron paramagnetic resonance and radical trapping experiments indicated that both superoxide and hydroxyl radicals were involved in MB oxidation during the regeneration process.
    Keywords 2,4-dichlorophenol ; activated carbon ; adsorption ; atrazine ; electron paramagnetic resonance spectroscopy ; macropores ; methylene blue ; micropores ; ofloxacin ; oxidation ; pH ; wastewater treatment
    Language English
    Dates of publication 2023-0115
    Publishing place Elsevier B.V.
    Document type Article
    ZDB-ID 1491302-1
    ISSN 1873-3336 ; 0304-3894
    ISSN (online) 1873-3336
    ISSN 0304-3894
    DOI 10.1016/j.jhazmat.2022.130026
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  3. Article: The degradation of enrofloxacin by a non-metallic heptazine-based OCN polymer: Kinetics, mechanism and effect of water constituents

    Du, Roujia / Chen, Ping / Zhang, Qianxin / Yu, Gang

    Chemosphere. 2021 June, v. 273

    2021  

    Abstract: Antibiotics are widespread in the environment with notable ecological risk, for which efficient and green removal technologies are demanded. As a kind of g–C₃N₄–based material with remarkable photocatalytic property, OCN is an oxygen- and nitrogen-linked ...

    Abstract Antibiotics are widespread in the environment with notable ecological risk, for which efficient and green removal technologies are demanded. As a kind of g–C₃N₄–based material with remarkable photocatalytic property, OCN is an oxygen- and nitrogen-linked carbon nitride organic polymer which can be synthesized through a single-step thermal polymerization method. In this study, OCN was applied for the visible-light-driven photocatalytic degradation of a typical fluoroquinolone (FQ) antibiotics enrofloxacin (ENR). The photocatalysis process achieved over 97% ENR removal within 60 min with 0.4 mg/L OCN and 4 mg/L ENR at pH 8.2. The photocatalytic mechanism of OCN at different pH was studied for the first time. It was shown that O2⋅−, ¹O₂ and h⁺ made contributions at neutral or basic pH and ¹O₂ contributes the most (57.6% at pH 8.2), while ⋅OH played a role only under acidic condition with a contribution rate of 23.8% at pH 3.2. The cleavage of the piperazine ring and the quinolone ring were two main degradation pathways. The common water constituents humic acid and NO₃⁻ showed a dual effect, but HCO₃⁻ and Cl⁻ inhibited the degradation. The effect of different water matrices was tested under natural sunlight and it was only a tiny disturbance to the degradation rates. The biotoxicity test conducted using Vibrio fischeri indicated that the toxicity of degradation products became negligible after 3 h. This study demonstrated that OCN is a promising candidate for the advanced treatment and in-situ remediation.
    Keywords Vibrio fischeri ; carbon nitride ; enrofloxacin ; fluoroquinolones ; humic acids ; pH ; photocatalysis ; piperazine ; polymerization ; polymers ; remediation ; risk ; solar radiation ; toxicity
    Language English
    Dates of publication 2021-06
    Publishing place Elsevier Ltd
    Document type Article
    Note NAL-light
    ZDB-ID 120089-6
    ISSN 1879-1298 ; 0045-6535 ; 0366-7111
    ISSN (online) 1879-1298
    ISSN 0045-6535 ; 0366-7111
    DOI 10.1016/j.chemosphere.2020.128435
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    In stock of ZB MED Cologne/Königswinter

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  4. Article ; Online: Dissolved organic matter isolates obtained by solid phase extraction exhibit higher absorption and lower photo-reactivity: Effect of components.

    Du, Roujia / Wen, Jiaqi / Huang, Jun / Zhang, Qianxin / Shi, Xiaoyu / Wang, Bin / Deng, Shubo / Yu, Gang

    Water research

    2024  Volume 256, Page(s) 121604

    Abstract: Notable differences in photo-physical and chemical properties were found between bulk water and solid phase extraction (SPE) isolates for dissolved organic matter (DOM). The moieties extracted using modified styrene divinylbenzene cartridges, which ... ...

    Abstract Notable differences in photo-physical and chemical properties were found between bulk water and solid phase extraction (SPE) isolates for dissolved organic matter (DOM). The moieties extracted using modified styrene divinylbenzene cartridges, which predominantly consist of conjugated aromatic molecules like humic acids, contribute mainly to light absorption but exhibit lower quantum yields of fluorescence and photo-produced reactive intermediates (PPRIs). Fourier transform ion cyclotron resonance mass spectrometry (FT-ICR MS) revealed lignin as the moieties displaying most significant variance in abundance. In Van Krevelen-Spearman plot, we observed molecules positively or negatively correlated with DOM's optical and photochemical properties (including SUVA
    MeSH term(s) Solid Phase Extraction ; Humic Substances ; Organic Chemicals/chemistry
    Chemical Substances Humic Substances ; Organic Chemicals
    Language English
    Publishing date 2024-04-11
    Publishing country England
    Document type Journal Article ; Research Support, Non-U.S. Gov't
    ZDB-ID 202613-2
    ISSN 1879-2448 ; 0043-1354
    ISSN (online) 1879-2448
    ISSN 0043-1354
    DOI 10.1016/j.watres.2024.121604
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  5. Article ; Online: Quantitative structure-activity relationship models for the reaction rate coefficients between dissolved organic matter and PPCPs.

    Du, Roujia / Zhang, Qianxin / Wang, Bin / Huang, Jun / Deng, Shubo / Yu, Gang

    Journal of hazardous materials

    2023  Volume 458, Page(s) 131845

    Abstract: To predict PPCPs' photolysis rate in natural aquatic environment, it is essential to grasp the reaction rates between DOM and PPCPs, yet there are few measured data and no prediction models for this important photochemical parameter. To address this, a ... ...

    Abstract To predict PPCPs' photolysis rate in natural aquatic environment, it is essential to grasp the reaction rates between DOM and PPCPs, yet there are few measured data and no prediction models for this important photochemical parameter. To address this, a reaction rate coefficient (α
    Language English
    Publishing date 2023-06-12
    Publishing country Netherlands
    Document type Journal Article
    ZDB-ID 1491302-1
    ISSN 1873-3336 ; 0304-3894
    ISSN (online) 1873-3336
    ISSN 0304-3894
    DOI 10.1016/j.jhazmat.2023.131845
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  6. Article ; Online: Analysis on the attenuation characteristics of PPCPs in surface water and their influencing factors based on a compilation of literature data.

    Du, Roujia / Duan, Lei / Zhang, Qianxin / Wang, Bin / Huang, Jun / Deng, Shubo / Yu, Gang

    Water research

    2023  Volume 242, Page(s) 120203

    Abstract: The attenuation characteristics of PPCPs play an important part in predicting their environmental concentrations. However, considerable uncertainty remains in reported laboratory data on the attenuation characteristics of PPCPs. In this analysis, we ... ...

    Abstract The attenuation characteristics of PPCPs play an important part in predicting their environmental concentrations. However, considerable uncertainty remains in reported laboratory data on the attenuation characteristics of PPCPs. In this analysis, we compile information on laboratory-observed photodegradation half-lives (t
    Language English
    Publishing date 2023-06-09
    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.2023.120203
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  7. Article ; Online: The degradation of enrofloxacin by a non-metallic heptazine-based OCN polymer: Kinetics, mechanism and effect of water constituents.

    Du, Roujia / Chen, Ping / Zhang, Qianxin / Yu, Gang

    Chemosphere

    2020  Volume 273, Page(s) 128435

    Abstract: Antibiotics are widespread in the environment with notable ecological risk, for which efficient and green removal technologies are demanded. As a kind of g- ... ...

    Abstract Antibiotics are widespread in the environment with notable ecological risk, for which efficient and green removal technologies are demanded. As a kind of g-C
    MeSH term(s) Catalysis ; Enrofloxacin ; Heterocyclic Compounds, 3-Ring ; Kinetics ; Polymers ; Triazines ; Water
    Chemical Substances Heterocyclic Compounds, 3-Ring ; Polymers ; Triazines ; Water (059QF0KO0R) ; Enrofloxacin (3DX3XEK1BN) ; heptazine (WSP2G0YL9N)
    Language English
    Publishing date 2020-10-13
    Publishing country England
    Document type Journal Article
    ZDB-ID 120089-6
    ISSN 1879-1298 ; 0045-6535 ; 0366-7111
    ISSN (online) 1879-1298
    ISSN 0045-6535 ; 0366-7111
    DOI 10.1016/j.chemosphere.2020.128435
    Database MEDical Literature Analysis and Retrieval System OnLINE

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    In stock of ZB MED Cologne/Königswinter

    Zs.A 2540: Show issues Location:
    Je nach Verfügbarkeit (siehe Angabe bei Bestand)
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    ab Jg. 2022: Lesesaal (EG)

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  8. Article ; Online: FeOCl-confined activated carbon for improving intraparticle Fenton-like oxidation regeneration.

    Zhang, Qianxin / Zhang, Menghan / Li, Tong / Du, Roujia / Yu, Gang / Deng, Shubo

    Journal of hazardous materials

    2022  Volume 442, Page(s) 130026

    Abstract: Highly efficient oxidation, as non-thermal regeneration technology, is a promising method to solve the regeneration problem of spent activated carbon (AC) in wastewater treatment. In this study, FeOCl was confined into activated carbon (FeOCl/AC) for ... ...

    Abstract Highly efficient oxidation, as non-thermal regeneration technology, is a promising method to solve the regeneration problem of spent activated carbon (AC) in wastewater treatment. In this study, FeOCl was confined into activated carbon (FeOCl/AC) for catalytic oxidation of contaminants on AC during the regeneration process. The characterization results of FeOCl/AC showed that amorphous FeOCl was distributed in micropores, mesopores and macropores of AC. The methylene blue (MB)-adsorbed FeOCl/AC had a regeneration efficiency of 93.7 % at neutral pH in the presence of H
    MeSH term(s) Charcoal/chemistry ; Hydrogen Peroxide/chemistry ; Methylene Blue/chemistry ; Atrazine ; Superoxides ; Oxidation-Reduction ; Adsorption ; Ofloxacin ; Water Pollutants, Chemical
    Chemical Substances Charcoal (16291-96-6) ; Hydrogen Peroxide (BBX060AN9V) ; Methylene Blue (T42P99266K) ; Atrazine (QJA9M5H4IM) ; Superoxides (11062-77-4) ; Ofloxacin (A4P49JAZ9H) ; Water Pollutants, Chemical
    Language English
    Publishing date 2022-09-19
    Publishing country Netherlands
    Document type Journal Article ; Research Support, Non-U.S. Gov't
    ZDB-ID 1491302-1
    ISSN 1873-3336 ; 0304-3894
    ISSN (online) 1873-3336
    ISSN 0304-3894
    DOI 10.1016/j.jhazmat.2022.130026
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  9. Article ; Online: The determination and prediction of the apparent reaction rates between excited triplet-state DOM and selected PPCPs.

    Du, Roujia / Zhang, Qianxin / Leresche, Frank / Zhong, Mengmeng / Chen, Ping / Huang, Jun / Deng, Shubo / Rosario-Ortiz, Fernando L / Yu, Gang

    The Science of the total environment

    2023  Volume 881, Page(s) 163117

    Abstract: To determine and predict the reaction rate ... ...

    Abstract To determine and predict the reaction rate between
    Language English
    Publishing date 2023-04-10
    Publishing country Netherlands
    Document type Journal Article
    ZDB-ID 121506-1
    ISSN 1879-1026 ; 0048-9697
    ISSN (online) 1879-1026
    ISSN 0048-9697
    DOI 10.1016/j.scitotenv.2023.163117
    Database MEDical Literature Analysis and Retrieval System OnLINE

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    In stock of ZB MED Cologne/Königswinter

    Zs.A 949: Show issues Location:
    Je nach Verfügbarkeit (siehe Angabe bei Bestand)
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  10. Article: Efficient degradation of typical pharmaceuticals in water using a novel TiO2/ONLH nano-photocatalyst under natural sunlight

    Zhang, Qianxin / Du, Roujia / Tan, Cuiwen / Chen, Ping / Yu, Gang / Deng, Shubo

    Journal of hazardous materials. 2021 Feb. 05, v. 403

    2021  

    Abstract: Photocatalytic degradation of typical pharmaceuticals in natural sunlight and in actual water is of great significance. In this study, the oxygen or nitrogen linked heptazine-base polymer (ONLH) was successfully incorporated with TiO₂ nanoparticles and ... ...

    Abstract Photocatalytic degradation of typical pharmaceuticals in natural sunlight and in actual water is of great significance. In this study, the oxygen or nitrogen linked heptazine-base polymer (ONLH) was successfully incorporated with TiO₂ nanoparticles and formed a TiO₂/ONLH nanocomposite which was responded to the natural sunlight. Under natural sunlight, the TiO₂/ONLH can effectively degrade ten types of pharmaceuticals. In particular, fluoroquinolone containing N-piperazinyl, and cardiovascular drugs containing long aromatic side chains were easily degraded. The half-life of the best degradation performance of propranolol was less than 5 min. The rate constants of propranolol using the TiO₂/ONLH were approximately six- and eight-fold higher than those of pristine TiO₂ and ONLH, respectively. Two reactive species (OH and O₂⁻) facilitated the rapid degradation of propranolol, which occurred primarily through the hydroxyl radical addition, ring-opening, and ipso substitution reactions. An acute toxicity test using luminescent bacteria indicated that the toxicity of the propranolol reaction solution gradually decreased with lower total organic carbon (TOC). According to the toxicity evaluation of monomer products, the TiO₂/ONLH also reduced the generation of toxic transformation products. The effects of actual water/wastewater have further shown the TiO₂/ONLH might be applied for the removal of pharmaceuticals in wastewater.
    Keywords acute toxicity ; drugs ; fluoroquinolones ; half life ; hydroxyl radicals ; luminescence ; nanocomposites ; nitrogen ; oxygen ; photocatalysis ; polymers ; propranolol ; solar radiation ; total organic carbon ; toxicity testing ; wastewater
    Language English
    Dates of publication 2021-0205
    Publishing place Elsevier B.V.
    Document type Article
    Note NAL-AP-2-clean
    ZDB-ID 1491302-1
    ISSN 1873-3336 ; 0304-3894
    ISSN (online) 1873-3336
    ISSN 0304-3894
    DOI 10.1016/j.jhazmat.2020.123582
    Database NAL-Catalogue (AGRICOLA)

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