FOOD MICROBIOLOGY
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2024
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IF 4.5
Qiaoyun Wei,Yuan Yuan,Jianhao Zhang,Jin Wang
This study investigated the fungicidal efficiency and mechanism of action of dielectric barrier discharge cold atmosphere plasma (DBD-CAP) in inactivating Aspergillus niger ( A. niger ) spores. The disinfection efficacy and quality of dried jujube used as the processing application object were also studied. The results indicated that the Weibull + Tail model performed better for spore inactivation curves at different voltages among various treatment times, and the spore cells were reduced by 4.05 log (cfu/mL) in spores suspension at 70 kV after 15 min of treatment. This disinfection impact was further supported by scanning electron microscope (SEM) and transmission electron microscopy (TEM) images, which showed that the integrity of the cell membrane was damaged, and the intracellular content leaked out after DBD-CAP treatment. Elevated levels of reactive oxygen species (ROS) during the treatment increased the relative conductivity of cells, and leakage of nucleic acids and proteins further supported the disinfection impact. Additionally, the growth and toxicity of surviving A. niger spores after treatment were also greatly reduced. When DBD-CAP was applied to disinfecting dried jujube, the spore number exhibited a 2.67 log cfu/g reduction after treatment without significant damage observed onto the quality ( P > 0.05 ).
研究领域:
食品科学
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微生物学
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产品关联
DOI
PubMed
高影响因子
Water
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2022
·Vol. 14
·期 21
·3384
·
IF 3.53
Jiushan Cheng,Yangyang Fan,Xueyun Pei,Di Tian,Zhongwei Liu,Zachary Z. Wei,Hai-feng Ji,Qiang Chen
Perfluorooctanoic acid (PFOA) is an artificially synthesized perfluorinated chemical widely used in industries. It is often released into the environment without treatment, which causes pollution in groundwater. Recently, we have reported a rapid and efficient removal of PFOA in aqueous solution by using a fountain-strip dielectric barrier discharge reactor (SF-DBD). This design allows for the gaseous–liquid interaction to happen in a large space at atmospheric pressure, so it is a promising method to efficiently remove PFOA from water. Recently, we reported the effects of the process parameters, including power mode, pulse time, sinusoidal wave discharge, the discharge gas, initial concentration, pH, conductivity, and positive and negative discharges, on the efficiency of this method for PFOA degradation. Understanding the reaction mechanism is key to further improve the efficiency of the system. In this work, we reported the decomposition mechanism of the SF-DBD for PFOA degradation. The mass spectrum (MS) showed that PFOA was degraded to perfluoroheptanoic acid, perfluorohexanoic acid, perfluoropentanoic acid, perfluorobutanoic acid, perfluoropropionic acid, and trifluoroacetic acid after the plasma treatment. The optical emission spectroscope (OES) and the radical scavenger experiments indicated that the excited argon atoms and hydroxyl radicals played a major role in PFOA degradation, while the contributions from the solvated electrons (e−aq), superoxide anion radical (·O2−), and singlet oxygen (1O2) were negligible in initiating the cleavage reaction.Keywords:mechanism;DBD;plasma;degrade;PFOA;reactive species
研究领域:
环境科学
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化学工程
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产品关联
DOI
高影响因子
Journal of Environmental Sciences
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2024
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IF 5.9
Yimo Zhao,Lijiao Zheng,Yongyang Chen,Yuan Liu,Shimeng Huang,Shanping Li
In this study, a highly efficient La-Fe 2 O 3 /dielectric barrier discharge (DBD)/honeycomb ceramic plate synergistic catalytic system was successfully constructed by using modified iron oxide (Fe 2 O 3 ) catalyst coating assisted DBD plasma, and the prepared catalytic coating was fully characterized by various techniques. The results indicate that the lanthanum (La) is efficiently and uniformly doped in Fe 2 O 3 , and the modified La-Fe 2 O 3 catalyst exhibited a better photocatalytic performance. The overuse of Thiamphenicol (TAP), as a typical chloramphenicol antibiotic, has led to its accumulation in the aquatic environment. Accordingly, TAP was selected as the target contaminant to evaluate the catalytic activity of the synergistic system. The results confirmed that the catalytic ability of the synergistic catalytic system was significantly improved, and the data showed that the degradation rate of the synergistic system reached 99.1% under the same conditions compared with 68.2% for the single DBD plasma, which effectively improved low energy efficiency limitations of the single DBD technology. Through quantitative measurements of the concentrations of dissolved ozone (O 3 ) and hydrogen peroxide (H 2 O 2 ) in the system and radical trapping experiments, combined with emission spectroscopy, the mechanism of synergistic system degradation of TAP was analyzed. The intermediates in the degradation process were characterized by high-resolution mass spectrometry, and the degradation pathway of TAP was proposed based on the analysis of the intermediates and their combination with theoretical calculations. This study presents a theoretical basis for the improvement of DBD technology and a technical guide for the removal process of antibiotics from industrial wastewater.
研究领域:
环境科学
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催化化学
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抗生素降解
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DOI
PubMed
高影响因子
CHEMICAL ENGINEERING JOURNAL
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2019
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IF 8.355
Jiali Wu,Qing Xiong,Jialiang Liang,Qiang He,Dongxu Yang,Ruoyu Deng,Yi Chen
Benzotriazole (BTA) is a widely used chemical in domestic and industrial products. BTA is bio-refractory and has become an emerging contaminant in the aquatic environment. In this study, a new approach for degradation of BTA is developed by coupling falling water film dielectric barrier discharge (DBD) plasma with peroxymonosulfate (PMS) or persulfate (PS). The degradation of BTA is significantly improved (by 47%) by the introduction of PMS into the DBD plasma system. In addition, the energy yield is increased by 84%. The enhanced degradation efficiency may be attributed to the activation of PMS enriches the active species and increases the oxidation potential of the DBD plasma system. Radical scavenger experiments show that both sulfate radical and hydroxyl radical contribute to the degradation of BTA, but the latter has greater direct impact on BTA degradation. In addition, superoxide radicals, singlet oxygen and electrons have also played an important role in the DBD-PMS system. Degradation intermediates of BTA are identified and reaction pathways, including hydroxylation, cleavage and coupling reactions, are proposed. Further toxicity analysis of intermediates demonstrates that the toxicity of oral rat LD 50 and the developmental toxicity of BTA are alleviated. Overall, the combination of DBD and PMS may be a promising technology for efficient, economical and environmentally friendly removal of refractory pollutants in water.
研究领域:
环境科学
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化学工程
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产品关联
DOI
高影响因子
PLASMA SCIENCE & TECHNOLOGY
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2019
·Vol. 21
·期 5
·054006
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IF 1.193
Yan HUI,Na LU,Pengzhen LUO,Kefeng SHANG,Nan JIANG,Jie LI,Yan WU
The classification of spatial characteristics and discharge modes of dielectric barrier discharge (DBD) are gaining increasing attention in industrial applications, especially in the field of surface treatment of materials. In this work, gray level histogram (GLH) and Fourier energy spectrum based on the digital image processing technology are applied to investigate the spatial structure and discharge mode of mesh-plate DBD. The coefficient of variation (CV) is calculated to describe the uniformity of the discharge. The results show that the discharge mode of mesh-plate DBD changes from periodic discharge to filamentary discharge when the applied voltage increases from 11–15 kV. Moreover, a more regular spatial structure is obtained under lower applied voltages during the discharge process. It is also found that the apertures of mesh electrodes which are below 1 mm have smaller values of CV compared to plate electrodes, indicating more uniform discharge. Finally, polypropylene is treated by mesh-plate DBD for surface modification. The hydrophilicity is significantly improved as the water contact angle decreased by 64°, and the dyeing depth is also enhanced.
研究领域:
材料科学
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等离子体技术
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表面处理
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DOI
高影响因子
FOOD CHEMISTRY
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2017
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IF 4.529
Junguang Li,Qisen Xiang,Xiufang Liu,Tian Ding,Xiangsheng Zhang,Yafei Zhai,Yanhong Bai
Soybean trypsin inhibitor (STI) is considered as one of the most important anti-nutritional factors in soybeans. The objective of this study was to investigate the impacts and underling mechanisms of dielectric-barrier discharge (DBD) plasma on STI activities. The results shown that DBD plasma treatment significantly induced the inactivation of STI in soymilk and Kunitz-type trypsin inhibitor from soybean (SKTI) in a model system. After exposure to DBD plasma at 51.4 W for 21 min, the STI activities of soymilk were reduced by 86.1%. Affter being treated by DBD plasma, the intrinsic fluorescence and surface hydrophobicity of SKTI were significantly decreased, while the sulfhydryl contents were increased. It is assumed that DBD plasma-induced conformational changes and oxidative modification might contribute to the inactivation of SKTI. In summary, DBD plasma technology is a potential alternative to heat treatment for the inactivation of anti-nutritional substances in food legumes.
研究领域:
食品科学
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生物化学
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产品关联
DOI
PubMed
高影响因子
CHEMICAL ENGINEERING JOURNAL
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2020
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IF 10.652
Ruoyu Deng,Qiang He,Dongxu Yang,Qi Dong,Jiali Wu,Xiangyu Yang,Yi Chen
Dielectric barrier discharge (DBD) is an attractive advanced oxidation process (AOP) due to its operational convenience and environmental friendliness. However, DBD plasma suffers from relatively low energy utilization, which limits its commercial application. In this study, nano-Fe 0 -CeO 2 is successfully synthesized and used for DBD plasma degradation of diclofenac (DCF). The results show that the nano-Fe 0 -CeO 2 significantly enhances the removal of DCF. A DBD-Fe 0 -CeO 2 system degrades 96.4% DCF within 10 min, which is higher than the DBD system alone (45.8%). The synergistic factor of the DBD system and nano-Fe 0 -CeO 2 reaches 3.731. In addition, the composite catalyst shows ideal reusability. Substance activity and production experiments show that reactive oxygen species (ROS), especially OH, play a key role in the degradation of DCF. Nano-Fe 0 -CeO 2 has synergistic effects with O 3 and H 2 O 2 and significantly promotes the generation of ROS in the DBD system. Based on the intermediates detected by liquid chromatography-mass spectrometry, a reasonable degradation pathway of DCF is proposed. Our findings are helpful for understanding the mechanism of DCF degradation by coupling nano-zero-valent-iron-based nanocomposites in a DBD system; they also provide an effective system for the treatment of refractory organic pollutants in water.
研究领域:
环境科学
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材料科学
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化学工程
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产品关联
DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
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2021
·
IF 13.273
Ying Wei,Guanglu Lu,Dongrun Xie,Tianyi Sun,Yu Liu,Ying Zhang,Jiutao An,Menghong Li,He Guo
Enrofloxacin (ENRO) as a highly toxic antibiotic poses great threats to human health and environmental safety. In this study, a novel technology of coupling dielectric barrier discharge (DBD) and ultraviolet (UV) was investigated to efficiently degrade ENRO in aqueous, and had a higher degradation rate. The ENRO degradation rate achieved approximately 93.9% at 30 min, and approximately 1.20 g kWh −1 of energy yield (G 50 ) was observed for the combined system. The addition of H 2 O 2 and K 2 S 2 O 4 improved the ENRO degradation due to the generation of ·OH and ·SO 4 2- . In the presence of NO 3 – , the ENRO degradation played a tendency to promote first and then decrease, and the presence of SO 4 2- resulted in the positive effect, while the negative effect was shown in the presence of Cl - and CO 3 2– . The trapping experiment indicated that ·OH played an important part in the ENRO degradation. The addition of UV into the DBD system decreased H 2 O 2 concentration in deionized water, and increased ·OH concentration. The DFT analysis showed the degradation mechanisms of ENRO at a molecular level. The degradation of ENRO mainly involved the oxidation of the piperazine group, the removal of ethyl acetate and the substitution of the F atom. The toxicity of ENRO and its degradation intermediates was evaluated.
研究领域:
环境科学
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化学工程
·
毒理学
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产品关联
DOI
高影响因子
FOOD HYDROCOLLOIDS
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2024
·
IF 11
Yongniu Zhang,Shuangfei Wang,Debao Niu,Zhi Huang,Lili Gai,Fangxue Hang
Casein is the primary allergen in the dairy products. This study investigated the effects of moderate dielectric barrier discharge (DBD) plasma treatment on the structure, antigenicity, and digestibility of casein. The results showed that exposure to moderate DBD plasma for 4 min decreased the antigenicity, digestibility, total amino acid content, α-helix content, surface hydrophobicity, and total free sulfhydryl (SH) groups of casein by 18.2%, 9.5%, 42.2%, 4.5%, 51.0%, and 50.9%, respectively. The amino acid side chains of casein were oxidized, but cleavage was not observed on the peptide bone. Moderate DBD plasma treatment induced structural modification and oxidation of the amino acid side chains, which disrupted both the conformational and linear epitopes of casein, resulting in a reduction of its antigenicity. The modification of amino acid may have also disrupted the enzymatic cleavage site of casein, leading to a decrease in its digestibility. This study provides evidence that moderate DBD plasma treatment can decrease the antigenicity of casein, potentially broadening the application of dairy products in the food industry.
研究领域:
食品科学
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生物化学
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产品关联
DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2023
·
IF 15.1
Ruoyu Deng,Dongxu Yang,Mengli Chen,Qiang He,Qingjuan He,Yi Chen
Nonthermal plasma has attracted extensive attention because of its ability to remove emerging organic micropollutants. However, its high amount of energy consumption severely limits its economic feasibility. In this study, sulfadiazine degradation was achieved in an optimized dielectric barrier discharge (DBD)-Contact system. The sulfadiazine removal in the DBD-Contact/peroxymonosulfate (PMS) system reached 91.8% within 15 min. Compared to a conventional DBD system, the energy efficiency (G 50 ) of the DBD-Contact/PMS system was 4.37 times greater, which meant a saving of 77.17% in electricity consumption. The reactive species generated by discharge plasma were identified as mostly excited nitrogen species in the gas phase, and after transferred to the water phase, OH and SO 4 − played an important role in the sulfadiazine removal. The hydroxylation of the S-N bond and the nucleophilic reaction of the pyrimidine ring were proposed as mechanisms for the sulfadiazine degradation, and the developmental and acute toxicity was significantly reduced after treatment. Furthermore, the DBD-Contact/PMS system showed good applicability in a wide pH range and complex practical water samples. This study finds that the DBD-Contact/PMS system can degrade antibiotics with high efficiency and low energy consumption and provides new insights for the practical application of DBD technology in water treatment.
研究领域:
环境科学
·
水处理技术
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产品关联
DOI
高影响因子
Desalination and Water Treatment
·
2024
·
IF 1
Yongjun Shen,Yunli Wang,Kaixia Fan
ABSTRACT Acid turquoise blue A (ATBA) is treated by the combined dielectric barrier discharge (DBD) plasma and AC supported CuO (CuO/AC). CuO/AC is prepared by incipient wetness impregnation method. X-ray diffraction, N 2 adsorption/desorption isotherm, and scanning electron microscope are used to characterize the CuO/AC. Interactive effects of initial pH, conductivity value, input power, and CuO/AC dosage on the decolorization rate of ATBA are investigated. The predicted decolorization rate of ATBA reaches to 97.12% under the optimal condition, only have 1.95% error compared with the experimental value (95.87%). The possible coupling mechanisms of combined DBD plasma and CuO/AC are proposed.
研究领域:
环境科学
·
材料科学
✓ 已验证
DOI
高影响因子
Plasma Processes and Polymers
·
2024
·
IF 2.9
Qinlong Song,Xianyi Yin,Haibao Zhang
Designing efficient noble metal-free catalysts for plasma-catalytic ammonia synthesis is significant and challenging. Carbon-based metal catalysts were prepared at different pyrolysis temperatures using the Ni-MOF-74 precursor. The effects of Ni-MOF-74 and its derived carbon-based metal catalysts on pulsed dielectric barrier discharge (DBD) plasma ammonia synthesis were investigated. The results showed that Ni-MOF-74-300 with both the MOF structure and nickel metal particles exhibited the best catalytic performance for ammonia synthesis. The ammonia synthesis rate reached 41.38 mmol g −1 h −1 , whereas the nitrogen conversion rate was as high as 1.54% with an energy yield of 3.04 g kWh −1 . Compared to the situation of plasma only, the ammonia synthesis rate, nitrogen conversion rate, and energy yield were increased by 28.46 times, 5.7 times, and 5.5 times, respectively.
研究领域:
化学工程
·
催化材料科学
✓ 已验证
DOI
高影响因子
危险品化学品经营许可证（带存储）