CHEMOSPHERE
·
2025
·
IF 8.1
Xinyao Wang,Zhiling Huang,Yue Meng,Bo Xie,Zheming Ni,Shengjie Xia
In this paper, ZnCdS/ZnCr-LDHs Z-scheme heterojunction containing zinc-oxygen bi-vacancy (V Zn + O ) were constructed and applied to photodegradation of norfloxacin (NOR) in water. A comprehensive investigation was conducted into the effects of concentration of V Zn in the composite, amount of catalyst, concentration of norfloxacin, temperature of the solution, and pH on the degradation activity. It comprehensively investigates the reaction kinetics, establishing a complete kinetic equation and determining the activation energy. Key parameters including catalyst dosage, pH, and reaction orders are systematically analyzed to elucidate their influence on the reaction process. The reaction mechanism of photodegradation of NOR is deeply analyzed from the perspectives of thermodynamics and kinetics. Z-scheme heterojunction not only facilitates the separation of photogenerated charges, but also preserves photogenerated electrons with strong reducing ability and photogenerated holes with high oxidizing ability; The existence of double vacancies not only provides more active sites for the material, but also regulates the band structure of the material, which contributes to the generation of free radicals. The synergistic effect of Z-scheme heterojunction and V Zn + O resulted in a removal rate of 89 % for NOR with a concentration of 20 mg/L after 90 min of visible light irradiation. In addition, based on ESR and XPS test results as well as DFT calculations, the synergistic mechanism of Z-scheme heterojunction and V Zn + O in the photodegradation process was analyzed in detail from the aspects of band structure, electron transfer, free radical species, and built-in electric field. The pathway of NOR photodegradation and the toxicity analysis of intermediate products were also provided.
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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光化学
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水处理技术
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毒理学
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产品关联
DOI
PubMed
高影响因子
JOURNAL OF INORGANIC BIOCHEMISTRY
·
2025
·
IF 3.2
Anadil Gul,Munir Ahmad,Rizwan Ullah,Kamran Ullah,Wenchao Liao,Yan Kang
Metallophthalocyanines (MPcs) are highly promising photosensitizers owing to their exceptional photoelectronic properties, yet their practical photocatalytic applications are often limited by strong π–π self-aggregation. In this study, we report a facile in situ strategy to incorporate cobalt phthalocyanine (CoPc) into the porous matrix of UiO-67 metal-organic frameworks (MOFs), effectively suppressing aggregation and enhancing photo-activity. The resulting composite, UCoP2–32, exhibited outstanding antibacterial photodynamic therapy (APDT) performance under visible light, achieving over 96 % inactivation of methicillin-resistant Staphylococcus aureus (MRSA) within 12 min of light exposure. Photophysical studies confirmed the efficient generation of both type-I and type-II reactive oxygen species (ROS), with superoxide and hydroxyl radicals predominating, and electron spin resonance (ESR) analysis supported this mechanism. Moreover, UCoP2–32 demonstrated excellent biocompatibility with minimal hemolysis (~6.4 % at 110 μM) and structural stability. This work provides a robust and broadly applicable strategy for integrating MPcs into MOFs, offering significant potential for the development of high-performance photocatalytic materials in antimicrobial and other light-driven applications.
研究领域:
材料科学
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光动力治疗
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抗菌技术
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纳米技术
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无机化学
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生物医学工程
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产品关联
DOI
PubMed
高影响因子
LWT-FOOD SCIENCE AND TECHNOLOGY
·
2020
·
IF 4.006
Yingjie Bao,Xiaopu Ren,Yuxia Zhu,Yawei Zhang,Zengqi Peng,Guanghong Zhou
The effects of 7 spice extracts on lipid radical formation were first collectively studied in situ in roasted beef by electron spin resonance (ESR). And the correlations among the ESR and conventional indexes including 2,2-diphenyl-1-picrylhydrazyl (DPPH) free radical scavenging capacity, reducing power, oxygen radical absorption capacity (ORAC), conjugated diene value (CDV) and thiobarbituric acid-reactive substances (TBARS) were also analysed. Clove was observed the highest scavenging lipid radical and DPPH radical capacity, and rosemary showed the highest peroxyl radical scavenging capacity, while tert-butylhydroquinone (TBHQ) significantly increased lipid radicals in roasted beef ( p < 0.05). ESR showed significant correlations with the DPPH and CDV assays ( p < 0.05) but no correlation with the ORAC and TBARS assays ( p > 0.05), indicating that with the addition of spice extracts, the lipid radical formation in roasted beef could be predicted by the DPPH assay but not be appropriate to evaluate the oxidation stability in roasted beef.
研究领域:
食品科学
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化学
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营养学
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产品关联
DOI
高影响因子
JOURNAL OF HAZARDOUS MATERIALS
·
2020
·
IF 9.038
Qian Ye,Hao Xu,Qingguo Wang,Xiaowei Huo,Yunqi Wang,Xue Huang,Guanyu Zhou,Jinfeng Lu,Jing Zhang
The specific roles of tartaric acid (TA), as an eco-friendly ligand, in homogeneous and heterogeneous copper-catalyzed systems were systematically revealed and new mechanisms of TA enhancing the three Fenton-like processes were proposed to provide a theoretical significance in overcoming the deficiency of conventional Fenton processes. The results identified hydroxyl radical (•OH) as the main species responsible for the simultaneous decomposition of TA and metronidazole (MNZ) according to TOC removal. The ESR technique was used to detect superoxide radicals (•O 2 − ), carbon-centered radical (•R) and hydrogen radical (•H) in the Cu 2+ /TA/H 2 O 2 system, which contributed to the acceleration of the Cu 2+ /Cu + redox cycle. The enhancing effect of TA on the homogeneous process was ascribed to the formation of a soluble complex with Cu 2+ , which favored the pH range extension, Cu + oxidation , and radical generation. Moreover, the adsorption of TA on the catalysts surface promoted the consumption of H 2 O 2 , inducing •OH generation. The formed surface complex (≡Cu 2+ -TA) also accelerated the regeneration of ≡Cu + , which was confirmed by density functional theory (DFT) calculation and surface characterization analysis (SEM, XRD, and XPS). The possible degradation pathways of MNZ in TA-modified Fenton-like system were also clarified.
研究领域:
环境科学
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化学工程
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材料科学
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催化
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高级氧化过程
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产品关联
DOI
PubMed
高影响因子
MACROMOLECULAR RAPID COMMUNICATIONS
·
2022
·Vol. 43
·期 19
·2200272
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IF 5.006
Suchun Ji,Xiying Li,Shuang Wang,Hongyuan Li,Huiling Duan,Xin Yang,Pengyu Lv
Physically cross-linked hydrogels have great potential for tissue engineering because of their excellent biocompatibility and easy fabrication. However, physical cross-linking points are typically weaker compared to chemical ones and therefore cannot form robust hydrogels with excellent water stability, which greatly hinder their further applications. In this work, a novel hydrogel with high stiffness and outstanding antiswelling performance cross-linked by hydrophobic polymer chains entanglements is reported. The hydrophobic polymer polyimide (PI) is mixed with the hydrophilic polymer poly-(vinyl pyrrolidone) (PVP) to form cross-linking points between the chains. At the equilibrium swelling state, tensile modulus of the hydrogel can be up to 22.57 MPa (higher than most existing hydrogels) and the equilibrium water swelling ratio ( ESR ) can be as low as 125.0%. By decreasing the PI mass ratio, tensile modulus and ESR of the hydrogel can be tuned in a wide range from 22.57 to 0.005 MPa and 125.0% to 765.6%, respectively. Using PVP/PI solutions as inks, uniform structures and multi-material structures are fabricated having mechanical properties close to cartilage through a direct ink writing 3D printing platform. This current work demonstrates that entangled PVP/PI hydrogels have excellent tailoring capabilities and are promising candidates for tissue engineering applications.
研究领域:
材料科学
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生物医学工程
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组织工程
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产品关联
DOI
PubMed
高影响因子
CHEMOSPHERE
·
2023
·
IF 8.8
Yunlei Zhou,Zhuangzhuang Wang,Huanshun Yin,Xiaoting Cui,Ying Tian,Zhen Qiao,Suo Wang,Runye Hu,Wenjing Lv,An Mao,Jun Wang
2D Ag/BiOCl/Bi 2 O 2 CO 3 S-scheme heterojunction was prepared with oxygen vacancy (OVs) via one-pot hydrothermal method. The XRD and XPS analysis indicated the synthesized sample contained Ag nanoparticles (AgNPs) instead of Ag ions. The SEM and HRTEM pictures showed that BiOCl/Bi 2 O 2 CO 3 nanosheets were modified with AgNPs. Compared with AgNPs, BiOCl, and Bi 2 O 2 CO 3 , Ag/BiOCl/Bi 2 O 2 CO 3 exhibited highly photocatalytic inactivation of pathogenic fungi ( Fusarium graminearum ) due to the wide light absorption range and S-scheme heterojunction structure, which improved the production and transfer of photogenerated carrier, and enhanced the separation of photogenerated e − /h + pairs. In addition, the improved photocatalytic disinfection against Fusarium graminearum of Ag/BiOCl/Bi 2 O 2 CO 3 was verified in Sedeveria Letizia plant . Furthermore, active species capture assay and ESR experiments disclosed the involvement of OVs, h + , ∙O 2 − , ∙OH, and – for Fusarium graminearum destruction during photocatalysis process. The S-scheme heterojunction was proved via oxygen vacancy, which was extensively beneficial to increase charge transmission and separation efficiency. Our work proposed Ag/BiOCl/Bi 2 O 2 CO 3 was an efficient and ecological fungicide to inactive Fusarium graminearum in vitro and vivo for crop disease .
研究领域:
材料科学
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化学
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环境科学
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农业科学
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植物病理学
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产品关联
DOI
PubMed
高影响因子
ANALYTICAL AND BIOANALYTICAL CHEMISTRY
·
2019
·Vol. 411
·期 25
·6677-6686
·
IF 3.286
Tian Sizhu,Li Xuwen,Jiang Jia,Wang Kun,Zhang Hanqi,Yu Aimin,Zhang Ziwei
The antioxidant capacity of 22 kinds of fruits was measured by the developed electron spin resonance (ESR) method based on Cu 2+ sensor. Cu 2+ is reduced to Cu + by the antioxidants in the fruits, and the remaining Cu 2+ was determined by ESR and UV-Vis spectroscopy. Cu 2+ can give an ESR signal whereas Cu + cannot, and the loss of the ESR signal was used to quantify the antioxidant capacity of various fruits. The results were shown as vitamin C equivalent antioxidant capacity (VCEAC). The VCEAC values obtained by ESR and UV-Vis methods ranged from 24.23 to 688.61 mg/100 g and from 24.12 to 677.79 mg/100 g, respectively. Cupric ion reducing antioxidant capacity (CUPRAC) and 1,1-diphenyl-2-picryl-hydrazyl (DPPH) methods were employed for comparison. Based on Pearson’s correlation test, the results obtained by CUPRAC and DPPH methods were both significantly correlated with these obtained by the present method, which indicated that the novel method was reliable. Total phenolic content for all kinds of fruits was measured with the Folin–Ciocalteu reagent, and VCEAC values obtained by the ESR method were significantly correlated with total phenolic contents.
Graphical abstract
研究领域:
分析化学
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食品科学
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营养学
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产品关联
DOI
PubMed
高影响因子
Journal of Environmental Chemical Engineering
·
2022
·
IF 7.968
Jiangfu Zheng,Yaocheng Deng,Changzheng Fan,Xiaoming Li,Daoxin Gong,Changwu Li,Ziyi Ye
The construction of an S-scheme heterojunction is an effective way to enhance the photocatalytic activity of composite materials. Thus, a co-precipitation method is combined with a hydrothermal synthesis method in this study to synthesize an S-scheme heterojunction of Bi 2 WO 6 /Ag 3 PO 4 /Zn-Al LDH photocatalyst with an exceptional morphology like a coral reef. On this basis, an AP0.5BWLDH0.3/PMS/Vis reaction system is constructed. The prepared Bi 2 WO 6 /Ag 3 PO 4 /Zn-Al LDH composites present better oxidation performance than pure Bi 2 WO 6 , Zn-Al LDH and Ag 3 PO 4 , with 100% Nitenpyram (50 mg/L) degraded within 90 min due to the photocatalytic activation of peroxymonosulfate. The significant increase in photocatalytic activity is not only due to the uniformly distributed coral reef-shaped nanostructures but also the extended life of the carrier with strong redox capability through S-scheme heterojunction. During the simulated exposure to sunlight, the internal electric field, optimized energy band structure, as well as coulomb force interaction all contributed to the promotion of the transportation of electron-hole pairs in the Bi 2 WO 6 /Ag 3 PO 4 /Zn-Al LDH composite. For this reason, electrons and holes have high reducing and oxidizing properties, which make the composites have high redox capacity. Then the radical trapping experiments, ESR testing and XPS analysis were used to verify these results. It was revealed that the S-scheme heterojunction mechanism was suitable for the electron migration in a photocatalyst. This study extends the design and preparation ideas of new S-scheme heterojunction photocatalysts and then proposes effective strategies to solve future water pollution .
研究领域:
环境科学
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材料科学
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光催化
·
水处理
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产品关联
DOI
高影响因子
APPLIED SURFACE SCIENCE
·
2023
·
IF 6.7
Tian Gao,Hua Zhang,Xiang Zhao,Shujuan Xiao,Ziyang Zhang,Shouwu Yu
The low photocatalytic efficiency of a single MOF limits its application, and the assembly of different MOF into MOF-on-MOF heterojunctions can construct fine charge transfer interfaces, thereby improving the photocatalytic ability. In addition, the heterojunction constructed by the two MOFs can maintain the porous structure of the MOF material to a large extent, which is conducive to the adsorption behavior. In this paper, Z-scheme heterojunction is prepared by solvothermal growth of MIL-88B on NH 2 -MIL-125 matrix. The Z-scheme heterojunction of NH 2 -MIL-125@MIL-88B greatly improves the photo-response range and charge separation efficiency. It showed good photocatalytic activity for tetracycline (TC) degradation. Under visible light irradiation, the removal efficiency of NM-3 catalyst with the best performance reached 96.26 % within 120 min, and the rate constant was 0.02428 min −1 , which was about 9.75 times and 4.16 times of NH 2 -MIL-125 and MIL-88B alone. The results of free radical trapping and ESR indicated that O 2 − and OH take important parts in the photodegradation of TC. The active sites and degradation pathways of TC vulnerable to attack were predicted by DFT calculation and intermediate analysis. The design and preparation of Z-scheme heterojunction provide a new strategy for visible light degradation of TC.
研究领域:
环境科学
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材料科学
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化学
·
光催化
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产品关联
DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2023
·
IF 15.1
Yanbin Wang,Zezhou Shi,Haibo Shen,Qiushuang Xing,Yunqing Pi
Efficient and selective removal of organic contaminants using traditional radical-dominated Advanced Oxidation Processes (AOPs) in complex environmental matrices is challenging, especially under high salinity conditions. This study proposes an alternative approach using iron (II) phthalocyanine-supported g-C 3 N 4 composite (FePc/CN) as a peroxymonosulfate (PMS) activator to efficiently remove organic contaminants. The FePc/CN-PMS process was selective towards the elimination of various organic contaminants, and those compounds with lower ionization potential value can be effectively degraded after reaction for 10 min. Results from radical quenching experiments, electron spin resonance (ESR), and PMSO chemical probe indicated that the dominant active species in the FePc/CN-PMS process are high-valent iron-oxo species (Fe IV O 2+ ), rather than the long-recognized SO 4 •− and •OH radical. A total of 22 intermediate products resulting from the degradation of levofloxacin (LVF) were identified by LC-MS. Additionally, two degradation pathways of LVF were proposed, with the piperazine ring of LVF being the primary site of degradation. The 5%FePc/CN-PMS system demonstrates resistance to ubiquitous inorganic anions and dissolved organic matter (DOM) in an aquatic environment, enabling efficient removal of (LVF) even under high salinity conditions. Furthermore, the 5%FePc/CN catalyst exhibits good chemical stability and reusability, making it a viable option for practical water remediation.
研究领域:
环境科学
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化学
·
水处理
·
材料科学
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产品关联
DOI
高影响因子
DIAMOND AND RELATED MATERIALS
·
2023
·
IF 4.1
Wen Xu,Di Su,Dongbin Yang,Mengjie Qiu,Jiandu Lei,Jing Liu
In this study, the In 2 O 3 -carbonization wood (In 2 O 3 -CW) composites were prepared using waste poplar wood through a comprehensive process involving “delignification-bleaching-impregnation-carbonization”. The morphology, crystal structure, elemental chemical state and photocatalytic activity of In 2 O 3 -CW were investigated by SEM, HRTEM , BET, XRD , XPS , UV–vis DRS, PL , EIS , ESR , TOC and LC-MS. Malachite green (MG) served as a model organic pollutant to assess the adsorption and visible-light photocatalytic performance of In 2 O 3 -CW in dye degradation. The results indicated a significant enhancement in the adsorption-photocatalytic performance of In 2 O 3 nanoparticles loaded with biomass, leading to a significant increase in the MG degradation rate from 24 % to 76 %. Specifically, when the concentration of MG was 100 mg·L −1 , 20 mg of 0.5In 2 O 3 -CW removed more than 96 % of MG to 481 mg·g −1 . The negatively charged surface of In 2 O 3 -CW was observed to be effective in adsorbing MG molecules. Moreover, In 2 O 3 -CW exhibited a narrow band gap, high photocatalytic activity, and excellent light harvesting ability, facilitating enhanced photogenerated electron-hole separation and the generation of potent active substances ( OH and O 2 − ). Given this knowledge, a detailed deduction of the dye discoloration mechanism was presented, offering a novel approach for the effective treatment of dye wastewater pollution and the realization of high-value applications for waste biomass resources from agriculture and forestry.
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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废水处理
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产品关联
DOI
高影响因子
MEDICAL SCIENCE MONITOR
·
2020
·
IF 1.918
Zhigang Xu,Zheng-Qin Zuo,Baibujiafu Gaowa,Yuan-Yun Gu,Chen Hui,Yong-Le Shen,Hou-Ping Xu
Background Laminaria japonica polysaccharide (LJP), a fucose enriched sulfated polysaccharide has been demonstrated to have excellent anticoagulant and antithrombotic activities. However, the antithrombotic effect of low molecular weight polysaccharide from enzymatically modified of LJP (LMWEP) remains unknown. Material/Methods LMWEP was prepared by fucoidanase enzymatic hydrolysis, and the antithrombotic and anticoagulant activities, and the underlying mechanism were investigated thoroughly. Rats were randomly divided into 6 groups (8 rats in each group): the blank control group, the blank control group treated with LMWEP (20 mg/kg), the model group, the model group treated with heparin (2 mg/kg), the model group treated with LJP (20 mg/kg), and the model group treated with LMWEP (20 mg/kg). After 7 days of intravenous administration, blood was collected for biochemical parameters examinations. Results LMWEP increased the activated partial thromboplastin time (APTT), thrombin time (TT), prothrombin time (PT), 6-keto prostaglandin F1α (6-Keto-PGF1α), and endothelial nitric oxide synthase (eNOS). In addition, LMWEP decreased fibrinogen (FIB), endothelin-1 (ET-1), thromboxane B2 (TXB2), erythrocyte sedimentation rate (ESR), and hematocrit (HCT). Conclusions LMWEP, an enzymatically modified fragment with a molecular weight of 25.8 kDa, is a potential antithrombotic candidate for treatment of thrombosis related diseases.
研究领域:
药理学
·
生物化学
·
血栓研究
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DOI
PubMed
高影响因子
危险品化学品经营许可证（带存储）