CHEMICAL ENGINEERING JOURNAL
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2023
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IF 15.1
Yingxin Wu,Jingyan Zhou,Zhuohao Wu,Quanyun Ye,Wencheng Wu,Xiaowen Liu,Dechun He,Guifang Lv,Jie Zhang
The dechlorination of polychlorinated biphenyl (PCB) has been studied intensively, while the comprehensive understanding of the electron transfer and selectivity pattern mechanism is still limited. Therefore, in this study, the reactivity of nickel/zero-valent iron (Ni/Fe) was investigated during the dechlorination of 2,2′,4,4′,5-pentachlorobiphenyl (PCB-99) at various temperatures. Gas chromatography-mass spectrometry analysis and quantum chemical calculations, including bond dissociation energy, C-Cl bond length, and the lowest unoccupied molecular orbital (LUMO), were used to explore the dechlorination pathways and the electron selectivity. Results showed that the reduction efficiency of PCB-99 (100 μg L −1 ) did not increase monotonically with the temperature, but followed the order: 25 °C (75.9%) > 15 °C (62.5%) > 35 °C (51.6%), due to the thermodynamic evolution of Fe species to generate more Fe(II) and the abundance of oxygen vacancies at 25 °C. However, as the temperature continued raising to 35 °C, Ni/Fe was oxidized heavily and aggregated into large particles, significantly reducing the electron density of Fe(II) and inhibiting the electron transfer. The main dechlorination pathway was PCB-99 → PCB-47 → PCB-17 → PCB-8 → PCB-3 → biphenyl, indicating that electrons tended to attack C-Cl bonds following the order meta- > para- > ortho- position, which could be better explained by LUMO. Overall, this work is expected to improve the understanding of the dechlorination behavior of PCB-99 from both fundamental and applied perspectives.
研究领域:
环境科学
·
化学工程
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产品关联
DOI
高影响因子
Emerging Contaminants
·
2025
·
IF 6.9
Wei Xiang,Fuhua Fu,Xuebo Shang,Jian Xu,Fengxiang Yu,Dengni Lai,Yang Shan
Dioxins are among the common persistent organic pollutants in crabs. To clarify the potential risk of dioxins pollution in Chinese mitten crab, eight types of samples were collected in the South Dongting Lake area for the analysis of 17 PCDD/Fs and 12 dl-PCBs. The results indicate that the concentration of Σ PCDD/Fs and Σ dl-PCBs in crabs was between 0.993–10.8 and 35.0–282 pg/g w.w., respectively. The mean WHO-TEQ value of Σ PCDD/Fs in crabs was 0.248 ± 0.205 pg TEQ/g w.w., and the mean WHO-TEQ value of Σ PCDD/Fs+dl-PCBs in crabs was 0.359 ± 0.280 pg TEQ/g w.w.. The total toxic equivalent of bottom sediment, surrounding soil, crab brown meat and juvenile crab were relatively high, which were 2.88, 2.67, 1.50 and 1.30 pg TEQ/g w.w., respectively. In the case of 99th percentile, the WHO-TEQ values of Σ PCDD/Fs and Σ PCDD/Fs+dl-PCBs in crab white meat were all within the maximum permitted levels as specified in commission regulation (EU) 2023/915. The HQ values of 99th percentile of Σ PCDD/Fs+dl-PCBs were 0.0783, 0.00703 and 0.0853 for eating brown meat products, eating white meat products and eating whole crabs, respectively. The coordinate points of the samples are connected to the origin by a straight line in the correspondence analysis map. The angle formed by the straight lines of crab brown meat/crab white meat and juvenile crab was acute angle, as did the feed. The angles between the straight line of bottom sediment/surrounding soil and that of other samples were all obtuse angles. In conclusion, although the dioxins of bottom sediment and surrounding soil are obvious, the dioxins of adult crabs are mainly related to that of the juvenile crabs and feed. At present, the intake of dioxins from Chinese mitten crab by Chinese residents is at a safe level because of low annual consumption. It is recommended that adults limit their weekly crab consumption to 1–4 crabs, or only 23.1–105 g of crab brown meat per week, or solely 435–1242 g of crab white meat per week.
研究领域:
环境科学
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食品安全
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DOI
高影响因子
CHEMICAL RESEARCH IN TOXICOLOGY
·
2022
·
IF 3.973
Lu Peng,Xiangyu Zhu,Zongming Qin,Jing Liu,Erqun Song,Yang Song
Polychlorinated biphenyls (PCBs) are a group of persistent organic environmental pollutants with various toxic effects. Our previous research found that a highly reactive quinone metabolite of PCBs, namely, PCB29-pQ, causes excessive reactive oxygen species (ROS) production and different toxic actions. Neutrophil extracellular traps (NETs), the product of NETosis, are one of the newly discovered programmed cell deaths. Recent studies have suggested the association of NET formation with excess ROS. The objective of this study was to investigate the influence of PCB29-pQ exposure on NETs and its possible molecular mechanisms. Using scanning electron microscopy, immunofluorescence microscopy, and the quantitative analysis of extracellular DNA, we found that PCB29-pQ exposure induces the formation of NETs in mouse bone marrow. Mechanistically, our results suggested that PCB29-pQ induces histone citrullination and chromatin decondensation, which are necessary processes for NET formation. Moreover, PCB29-pQ exposure increases ROS and autophagy levels, while ROS and autophagy inhibitors significantly reverse NET formation. These results indicated that PCB29-pQ-induced NET formation was mediated by the intracellular ROS level and autophagy signaling. In general, our research uncovered a toxicity mechanism of PCB29-pQ, which suggested the necessity of evaluating its immunotoxicity during the risk assessment of PCB exposure.
研究领域:
毒理学
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免疫学
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细胞生物学
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产品关联
DOI
PubMed
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2025
·
IF 13.2
Xinyuan Wei,Junyan Wei,Jianqiao Xu,Qing Zheng,Xiaolei Teng,Zunyao Wang,Ruijuan Qu
The generation of highly reactive hydroxyl radicals (•OH) in natural water under sunlight irradiation has been demonstrated to significantly affect the degradation of compounds in water. However, studies concerning the effects of free •OH on the degradation of hydrophobic pollutants in real, complex environments remain limited. This study examined how •OH generated by a UV/H₂O₂ system affects the heterogenous photodegradation of polychlorinated biphenyls (PCBs) in a natural suspended particle-water system. The results showed that •OH effectively decomposed PCB-3, 15 and 47, but had no effect on PCB-136, 155, 206 and 209. Further experiments revealed that •OH in the aqueous phase primarily reacts with PCBs that have desorbed into the water. The short diffusion distance of •OH and the higher potential energy barriers in hydrophobic regions hindered its reaction with PCBs on particle surfaces. Lowering solution pH or adding certain cations improved PCB-3 degradation by increasing its aqueous partitioning. Conversely, the presence of humic acid (HA) could quench •OH and screen light, thereby hindering the degradation of PCB-3 on particle surface by •OH. This study provides valuable insights into the mechanisms of •OH mediated degradation of hydrophobic pollutants and may advance the development of environmental treatment technologies.
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DOI
高影响因子
BIOCHEMICAL ENGINEERING JOURNAL
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2021
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IF 3.978
Tao Xu,Teng Liu,Dawei Jiang,Ziyue Yuan,Xiaoqiang Jia
Persistent organic pollutants (POPs) mainly including polycyclic aromatic hydrocarbons (PAHs), polychlorinated biphenyls (PCBs), and organochlorine pesticides (OPs), have long-term harmful effects on human health and the environment. In this study, a natural consortium BP-W was attained from oil-contaminated soil using biphenyl as the sole carbon source, which is a relatively simple PAH and can form PCBs under certain catalytic conditions. PCR-DGGE techniques were used to analyze the structure of the consortium BP-W. The results showed that this consortium was composed of Chryseobacterium BP-1, Pseudomonas putida BP-2, Stenotrophomonas BP-3, Achromobacter BP-4, and an uncultured bacterium. The consortium BP-W degraded 99.88 % of 1 g L −1 biphenyl in 72 h. The degradation ratios of 100 mg L −1 naphthalene, phenanthrene, pyrene, and PCB77 in 5 days were 100 %, 97.54 %, 42.26 %, and 26.73 %, respectively. Notably, the consortium BP-W exhibited a high tolerance for these POPs. In the binary-substrate and ternary-substrate systems, the consortium BP-W was still able to rapidly degrade organic substrates. The results of gas chromatography-mass spectrometry showed that biphenyl was completely degraded by BP-W and entered the TCA cycle through the protocatechuic acid pathway, and no other highly toxic metabolites were produced during the degradation process. Thus, this consortium BP-W may have potential utility for the environmental-friendly and cost-effective bioremediation of POPs.
研究领域:
环境科学
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微生物学
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生物技术
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产品关联
DOI
高影响因子
Science China-Materials
·
2023
·Vol. 66
·期 10
·4054-4061
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IF 8.1
Teng Peicheng,Wang Zhao,Kang Yu,Zhang Yikai,Wang Shutao
Multilayer elastic printed circuit boards (E-PCBs) have emerged as advanced configurations for integrating electronic components on elastomer substrates. However, weak inter-layer adhesion in elastic substrates can result in deformation-induced cracks and delamination in real-world applications. In this study, we present a novel approach to address this challenge by developing supramolecular sandwiched elastomers with high-adhesion skin and mechanically strong cores. This is achieved by precisely regulating the coordination bonds between different metal ions and the ethylenediamine groups within the aminated polydimethylsiloxane. The resulting sandwiched elastomer exhibits strong adhesion between layers (adhesion strength of 0.80 MPa), breaking strength of 0.81 MPa, Young’s modulus of 0.49 MPa, and maximum strain exceeding 500%. Leveraging these properties, the multilayered configuration of E-PCBs can be efficiently and securely assembled using the designed sandwiched elastomers through a simple layer-mounting method. This study offers a promising avenue for the simple and effective fabrication of mechanically stable multilayer flexible devices, eliminating the need for additional adhesive layers and complex structural constructions.
研究领域:
材料科学
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电子工程
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高分子化学
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DOI
高影响因子
SENSORS AND ACTUATORS B-CHEMICAL
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2022
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IF 9.221
Cuizhong Zhang,Hongjie Liu,Wanting Nong,Jinyun Peng,Liwei Wang,Liya Zhou
A novel photoelectrochemical (PEC) aptasensor coupled with a Z‑scheme was developed to realize quantitative determination of 3,3′,4,4′-tetrachlorobiphenyl (PCB77) at a concentration of sub-picogram per liter. The PEC aptasensor was fabricated by immobilizing ZnSe/Ag 2 Se on indium-tin oxide (ITO) that could covalently bind sulfurized aptamer. Meanwhile, complementary DNA-functionalized CdTe units were used as the sensitizers, and these were immobilized on the aptamer to form Z‑scheme dual-photosystem (PS). The Z‑scheme PS based on both ZnSe/Ag 2 Se and CdTe would be provided with better photocatalytic activity than conventional heterojunctions , and improving the photo-to-current conversion efficiency without biased voltage. Following the process of hatching, PCB77 was captured via the aptamer on the PEC aptasensor, producing aptamer–PCB77 complexes with weak conductive performance. Using the photocurrent change as a response signal for the quantitative detection of PCB77, the detection limits of the proposed method were 0.05 pg L –1 and 0.22 ng L –1 for the linear ranges of 0.01–500 pg L –1 and 0.5–10 5 ng L –1 , respectively. Compared with other technologies, the PEC aptasensor is more flexible, sensitive, specific and rapid in the absence of biased voltage under visble light. The results presented herein can potentially help build a model for the detection of various polychlorinated biphenyls (PCBs) with stable chemical properties and insulation performances that can be used to study persistent organic pollutants (POPs) in marine organisms and in the analysis of environmental conditions.
研究领域:
环境科学
·
分析化学
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海洋生物学
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污染监测
✓ 已验证
产品关联
DOI
高影响因子
危险品化学品经营许可证（带存储）