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    Comparative evaluations of testing methods for the biodegradation rates of degradable materials
    Wei ZHAO, Yu LI, Wei ZHANG, Kehua ZHU, Ke ZHOU, Qing LYU, Shixian LIU, Zhenming GE
    Journal of East China Normal University(Natural Science)    2023, 2023 (6): 158-167.   DOI: 10.3969/j.issn.1000-5641.2023.06.015
    Abstract44)   HTML5)    PDF (1022KB)(27)      

    Herein, based on existing standards for the measurements of material degradation rates and the degradation abilities of microorganisms, four methods were designed to determine material degradation rates. These four methods included two standard methods (inoculums: composting, vermiculite+composting leachate) and two experimental methods (inoculums: vermiculite+Bacillus, vermiculite+thermophilic bacteria). For this, the raw paper and plastic film (polylactic acid, PLA) components of environmentally friendly tape, as well as the finished tapes, were used as test materials to compare the material degradation rates using the above methods. Throughout the 60-day test cycle, both the PLA films and raw paper presented high degradation rates according to the four methods. The degradation rate of finished tape products increased gradually under the composting and vermiculite+composting leachate treatment and marginally rapidly under the vermiculite+Bacillus treatment. Additionally, under the vermiculite + thermophilic bacteria treatment method, the finished tape materials displayed a markedly higher degradation rate than that produced by other methods (roughly 1.7 ~ 7.5 times). Thus, the addition of microorganisms, particularly thermophilic bacteria, enhances the testing efficiency of material biodegradation rates. Therefore, we suggest that the optimization of degradation cultures can improve the testing efficiency of material degradation parameters, allowing manufacturing enterprises to shorten the research and development cycles of biodegradable products.

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    Surface-modified aluminum used for hydrogen generation and aqueous contaminant removal
    Yang YANG, Zhenyan DENG, Xiaohan GUO, Genwang MA, Weizhuo GAI
    Journal of East China Normal University(Natural Science)    2023, 2023 (2): 168-182.   DOI: 10.3969/j.issn.1000-5641.2023.02.018
    Abstract165)   HTML13)    PDF (3313KB)(38)      

    Aluminum (Al) used for hydrogen generation and aqueous contaminant removal has been widely studied given its abundance and low redox potential; the reduction ability of Al, moreover, is restricted by the passive surface oxide film on Al particles. In addition to common Al surface treatment methods, such as acid/alkali washing, alloying, and mechanical ball-milling, Al surface modification technology arising in recent years has also been confirmed as an efficient Al activation method given its economical cost and benign manufacturing process. In this study, the merits and disadvantages of surface modification relative to other Al surface treatment methods were highlighted by reviewing existing research on the application of Al surface modification in hydrogen generation and aqueous contaminant removal. In addition, the paper presents an outlook on Al surface modification technology used for hydrogen generation and aqueous contaminant removal to promote the study of related processes.

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    Preparation and photocatalysis properties of I-TiO2/Sr2MgSi2O7:Eu,Dy composite photocatalyst
    Jiaxiang CHEN, Zhejuan ZHANG, Er NIE, Yenan SONG, Xianqing PIAO, Zhuo SUN
    Journal of East China Normal University(Natural Science)    2022, 2022 (6): 157-168.   DOI: 10.3969/j.issn.1000-5641.2022.06.016
    Abstract179)   HTML7)    PDF (1860KB)(81)      

    A I-TiO2/Sr2MgSi2O7:Eu,Dy composite photocatalyst was prepared via hydrolysis for efficient degradation of organic pollutants in the absence of light. In this paper, the photocatalytic degradation of Rhodamine B (RhB) by the composite photocatalyst was studied. The results show that the degradation ability of I-TiO2/Sr2MgSi2O7:Eu,Dy composite photocatalyst with a I-TiO2 ratio of 30% is better, and the degradation efficiency of RhB pollutants reached 31.9% in 6 h without a light source. These results indicate that a Sr2MgSi2O7:Eu,Dy composite photocatalyst, supported by long afterglow phosphor, can absorb light energy and become a new light source in light-free or low-light environments for the photocatalytic reaction of I-TiO2 in order to achieve 24-hour catalytic purification.

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    Study on Fe2O3/g-C3N4 photocatalytic degradation of Rhodamine B
    Qinghua XI, Yiqiang HUANG, Jiaxiang CHEN, Er NIE, Zhuo SUN
    Journal of East China Normal University(Natural Science)    2021, 2021 (3): 151-160.   DOI: 10.3969/j.issn.1000-5641.2021.03.015
    Abstract356)   HTML47)    PDF (1416KB)(110)      

    In order to improve the low specific surface area of g-C3N4, three-dimensional (3D) porous g-C3N4 was prepared using high temperature thermal polymerization. Fe2O3/g-C3N4 catalyst was prepared by compositing the g-C3N4 with Fe2O3 to improve its visible light response. The decolorization rate of the Fe2O3/g-C3N4 catalyst reached 100% in 30 minutes with a g-C3N4 content of 900 mg, Rhodamine B (RhB) concentration of 20 mg·L–1, and H2O2 content of 15 mmol. The Fe2O3/g-C3N4 catalyst also demonstrated good performance in degrading other organics; the degradation rates of Methyl orange (MO) and Tetracycline (TC) reached 80% and 90%, respectively, in 30 minutes. This photocatalytic mechanism was explored by active group capture experiments, and the results show that h+ and ·OH play an important role in the progress of photocatalysis.

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    Study on the performance of I-doped TiO2 nanotube arrays for planar photocatalytic fuel cells
    Jun ZHOU, Qinghua XI, Yiqiang HUANG, Er NIE, Zhuo SUN
    Journal of East China Normal University(Natural Science)    2021, 2021 (1): 165-175.   DOI: 10.3969/j.issn.1000-5641.201922019
    Abstract328)   HTML35)    PDF (1346KB)(97)      

    The photoanode of I-doped TiO2 nanotube arrays (ITNA) prepared by anodization exhibited better degradation performance than TNA. The planar photocatalytic fuel cell (p-PFC) obtained by combining ITNA and Pt electrodes achieved a maximum decolorization rate of 93.1% when the concentration of methylene blue (MB) was 6 mg·L–1and the electrode plate spacing was 1.0 cm. The degradation of MB occurred on the surface of ITNA, which was a rate-limiting step. Compared to other structures, p-PFC had a higher photocatalytic performance and better production of h+ and ·OH, while degrading MB and other organics.

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    Determination of sulfonamides by ultra-high performance liquid chromatography with microextraction
    LI Yi, ZHANG Yan, ZHANG Ya-ting, HE Pin-gang, WANG Qing-jiang
    Journal of East China Normal University(Natural Sc    2019, 2019 (2): 156-163.   DOI: 10.3969/j.issn.1000-5641.2019.02.017
    Abstract326)   HTML14)    PDF (950KB)(380)      
    In this study, the development of an analytical method for the determination of chicken meat based on three-phase hollow fiber membrane microextraction ultra-high performance liquid chromatography (HF-LPME-UHPLC) was explored. A three-phase hollow fiber membrane microextraction system was developed to optimize the extraction conditions of HF-LPME:the extractant was n-octanol, the concentration of NaOH in the receiving phase was 200 mmol/L, the concentration of hydrochloric acid in the sample solution was 1.0 mmol/L, the concentration of Na2SO4 was 375 g/L, the extraction temperature was 30°, the stirring rate was 300 r/min, and the extraction time was 4 hours. Chicken meat samples were extracted and analyzed by UHPLC. Chromatographic analysis showed that the six sulfonamides reached baseline separation within six minutes. The linearity of the six sulfonamides in the mass range was good with a correlation coefficient of R2 > 0.998 9, the enrichment factors ranged from 188 to 950 times, and the detection limit was 0.03~0.1 ng/mL (S/N=3). The recoveries of sulfonamides flagged in chicken were 85.2%~95.6% with relative standard deviations of 3.13%~4.33% (n=5) at a concentration of 50 μg/kg. The studied method is highly sensitive and reproducible, and can be used for the detection of sulfonamides in chicken.
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    pH induced regulation of the morphology and properties of polybenzidine submicron rods
    WANG Lin, ZHANG Yan-hui, Arzugul MUSLIM, Abida ABDUNAZAR, LAN Hai-die
    Journal of East China Normal University(Natural Sc    2019, 2019 (2): 164-173.   DOI: 10.3969/j.issn.1000-5641.2019.02.018
    Abstract340)   HTML10)    PDF (2576KB)(324)      
    Polybenzidine was prepared using micelles of the triblock copolymer PnBA28-b-PS75-b-P2VP104 as a template. The effects of different pH values on the morphology and properties of polybenzidine (PBZ) were investigated by regulating the pH value of the micellar solution of the templates. The molecular weight distribution and structure of the triblock copolymer PnBA28-b-PS75-b-P2VP104 were determined by size exclusion chromatography (SEC) and nuclear magnetic resonance spectroscopy (1H-NMR). The morphology and structure of the composites were characterized using a scanning electron microscope (SEM), transmission electron microscope (TEM), and Fourier transform infrared spectroscopy (FT-IR). The electrochemical capacitance of the composites was evaluated by chronopotentiometry. The effects of the pH value on the morphology, structure and properties of PBZ were explored in this study. The PBZ particles were submicron and micron rods with uniform distribution and a smooth surface. PBZ rods obtained at pH=5 had an average diameter that ranged from several tens to 200 nm. The uniformity of particle morphologies was found to decrease with an increase in pH value; A electrochemical performance test showed that the specific capacitance of PBZ reached 339.06 F/g at pH=5.
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    Preparation and application of crosslinked polyvinyl alcohol in electrosorption
    CHEN Ling, MAO Shudi, ZHANG Yi, LI Zhe, PIAO Xianqing, SUN Zhuo, ZHAO Ran
    Journal of East China Normal University(Natural Science)    2020, 2020 (2): 120-130.   DOI: 10.3969/j.issn.1000-5641.201931003
    Abstract309)   HTML18)    PDF (1446KB)(71)      
    Sulfosuccinic acid (SSA) can be used as a crosslinking agent and a donor of a hydrophilic group when fabricating a cation exchange membrane. In this study, SSA was crosslinked with polyvinyl alcohol to form a cation exchange membrane for a capacitive deionization system. In this study, the impact of manufacturing parameters (i.e., crosslinker content, crosslinking temperature) on the deionization performance of a composite membrane were investigated in detail. A comparison was made between a capacitive deionization system (CDI) without an ion exchange membrane and a membrane capacitive deionization system (MCDI) coated with a PVA/SSA layer. The results show that the adsorption capacity and charge efficiency can be enhanced by 15% and 25%, respectively, with the PVA/SSA membrane layer; furthermore, the optimal mass fraction of SSA is 5%, and the optimal crosslinking temperature is 100 ℃.
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    Preparation and fluorescence detection properties of ZnO nanostructure based on microdroplets
    HUANG Binbing, XIE Yan, XIE Wenhui, ZHAO Zhenjie, LI Xin
    Journal of East China Normal University(Natural Science)    2020, 2020 (2): 131-139.   DOI: 10.3969/j.issn.1000-5641.201933001
    Abstract252)   HTML78)    PDF (1224KB)(129)      
    In this paper, we discuss ZnO nanostructures synthesized by a hydrothermal method in a droplet microreactor. The microfluidic chip used integrates a multi-function unit that includes a T-channel for droplet formation, a Y-channel for droplet fusion, and an S-channel for rapid mixing and observation of the nanoparticle formation process. By adjusting the flow rates of the aqueous phase and the oil phase, we studied the morphology and size of droplets; fluorescence detection of the ZnO nanostructure synthesized, moreover, was evaluated by an FITC-labeled goat anti-bovine IgG. This work shows that ZnO nanostructures can be prepared by fluid dynamic coupling of droplets and that the morphology and size of the nanostructures vary with droplet size. When the flow rates of the oil phase, ammonia water, and ferric solution were 600, 30, and 90 μL/h, respectively, the ZnO nanostructure synthesized at 75 ℃ showed optimal fluorescence detection performance.
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