作者机构：
[Feng, Guoqiang; Li, Qianhua; Gong, Shengyi; Jiang, Siyu; Zhu, Wenlong] Cent China Normal Univ, Coll Chem, Key Lab Pesticide & Chem Biol, Minist Educ, Wuhan 430079, Peoples R China.
通讯机构：
[Guoqiang Feng] K;Key Laboratory of Pesticide and Chemical Biology of Ministry of Education, College of Chemistry, Central China Normal University, 152 Luoyu Road, Wuhan 430079, China
作者机构：
[Gao, Ke; Zhang, He; Zhang, Yanmeng] Cent China Normal Univ, Coll Chem, CCNU uOttawa Joint Res Ctr, Key Lab Pesticides & Chem Biol,Minist Educ, 152 Luoyu Rd, Wuhan, Hubei, Peoples R China.
通讯机构：
[Ke Gao] C;CCNU-uOttawa Joint Research Centre, Key Laboratory of Pesticides & Chemical Biology, Ministry of Education, College of Chemistry, Central China Normal University, 152 Luoyu Road, Wuhan, Hubei, P.R. China
摘要：
The selective reductive N-methylation and N,N-dimethylation of primary amines using CO2 are some of the most significant challenges faced by organic chemists. Herein, we report the highly selective N,N′-diisopropylcarbodiimide-catalyzed methylation of primary amines using 1 atm CO2 under metal-free conditions. Borane–piperazine and borane–trimethylamine complexes were used as reducing agents for the N-methylation and N,N-dimethylation of various aromatic primary amines, respectively, in the presence of CO2. Mechanistic studies suggest that the selectivity of methylation is controlled by the steric effects of amines and boranes.
通讯机构：
[Qiu, S ] Z;[Li, JR; Sun, Y ] C;[Xiong, XX ] W;Zhejiang Univ, Huzhou Cent Hosp, Affiliated Huzhou Hosp, Dept Neurosurg,Sch Med, Huzhou 313000, Peoples R China.;Cent China Normal Univ, Coll Chem, Natl Key Lab Green Pesticides, Wuhan 430079, Peoples R China.
关键词：
Metallacycles;metallacages;Near-infrared biochannel;In vivo imaging;Theranostic
摘要：
In the past decade, the metallacycles/metallacages have attracted unremitting interest in biomedical fields, yet visual tracking of their in vivo delivery, targeting ability, biodistribution and therapeutic evaluation are still hampered by their short emission wavelengths. More recently, the near-infrared biochannel (NIR, 0.7-1.7 & mu;m) especially the NIR-II region (1.0-1.7 & mu;m) provides deeper tissue penetration and higher contrast than traditional UV-Vis region for in vivo imaging. In this context, we provide a comprehensive and systematic insight into the development of NIR metallacycles/metallacages for biomedical applications. Finally, we also discuss the challenges and prospects of NIR metallacycles/metallacages for future biomedical research and clinical translation.
作者机构：
[Wang, Huai-Yu; Ma, Jin-Tian; Wu, An-Xin; Wu, Chun-Yan; Zhuang, Shi-Yi; Yu, Zhi-Cheng; Wu, Yan-Dong; Chen, Xiang-Long; Yang, Dong-Sheng] Cent China Normal Univ, Coll Chem, Key Lab Pesticide & Chem Biol, Minist Educ, Wuhan 430079, Peoples R China.;[Tang, Bo-Cheng] Hong Kong Polytech, Dept Appl Biol & Chem Technol, State Key Lab Chem Biol & Drug Discovery, Kowloon, Hong Kong 999077, Peoples R China.
通讯机构：
[Yan-Dong Wu; An-Xin Wu] K;Key Laboratory of Pesticide & Chemical Biology, Ministry of Education, College of Chemistry, Central China Normal University, Wuhan 430079, P. R. China
摘要：
A concise and efficient hydrodefluorination process was developed for the synthesis of gem-difluoroalkenes. This reaction employs rongalite as a masked proton source and does not require any additional catalysts or reductants. Notably, trifluoromethyl alkenes having both terminal and internal double bonds are compatible with this process, allowing for a wider range of substrates. The successful late-stage functionalizations of pharmaceuticals and gram-scale syntheses were used to demonstrate the viability of this method.
通讯机构：
[Xiang, Jia-Chen] S;[Ma, Jin-Tian] K;School of Chemistry and Chemical Engineering, Southeast University, Nanjing 211189, China<&wdkj&>Key Laboratory of Pesticide & Chemical Biology, Ministry of Education, College of Chemistry, Central China Normal University, Wuhan 430079, P. R. China
摘要：
We herein report an efficient synthesis of 2-aroyl-3-arylquinolines from phenylalanines and anilines. The mechanism involves I(2)-mediated Strecker degradation enabled catabolism and reconstruction of amino acids and a cascade aniline-assisted annulation. Both DMSO and water act as oxygen sources in this convenient protocol.
作者机构：
[Lu, Liang-Qiu; Rao, Li; Zhou, Zheng-Xin; Xiao, Wen-Jing; Li, Yu-Jie; Liu, Xiao-Peng; Xiao, Yu-Qing] Cent China Normal Univ, CCNU uOttawa Joint Res Ctr, Key Lab Pesticide & Chem Biol, Minist Educ,Coll Chem, 152 Luoyu Rd, Wuhan 430079, Hubei, Peoples R China.;[Li, Miao-Miao] Zhengzhou Univ, Henan Inst Adv Technol, Div Mol Catalysis & Synth, Zhengzhou 45000, Peoples R China.;[Cao, Meng-Yue; Liu, Xiao-Peng] Westlake Univ, Sch Sci, Hangzhou 310024, Peoples R China.;[Lu, Liang-Qiu] Chinese Acad Sci, Lanzhou Inst Chem Phys LICP, State Key Lab Oxo Synth & Select Oxidat, Lanzhou 730000, Peoples R China.;[Lu, Liang-Qiu] Henan Normal Univ, Sch Chem & Chem Engn, Xinxiang 453007, Henan, Peoples R China.
通讯机构：
[Dr. Li Rao; Prof. Liang-Qiu Lu] C;CCNU-uOttawa Joint Research Centre, Key Laboratory of Pesticide & Chemical Biology, Ministry of Education, College of Chemistry, Central China Normal University, 152 Luoyu Road, Wuhan, Hubei, 430079 China<&wdkj&>State Key Laboratory for Oxo Synthesis and Selective Oxidation, Lanzhou Institute of Chemical Physics (LICP), Chinese Academy of Sciences, Lanzhou, 730000 P. R. China<&wdkj&>School of Chemistry and Chemical Engineering, Henan Normal University, Xinxiang, Henan, 453007 China<&wdkj&>CCNU-uOttawa Joint Research Centre, Key Laboratory of Pesticide & Chemical Biology, Ministry of Education, College of Chemistry, Central China Normal University, 152 Luoyu Road, Wuhan, Hubei, 430079 China
摘要：
Ring-opening transformations of donor-acceptor (D-A) cyclopropanes enable the rapid assembly of complex molecules. However, the enantioselective formation of chiral quaternary stereocenters using substrates bearing two different acceptors remains a challenge. Herein, we describe the first palladium-catalyzed highly diastereo- and enantioselective (3+2) cycloaddition of vinyl cyclopropanes bearing two different electron-withdrawing groups, a subset of D-A cyclopropanes. The key to the success of this reaction is the remote stereoinduction through hydrogen bond from chiral ligands, which thereby addressed the aforementioned challenge. A variety of chiral five-membered heterocycles were produced in good yields and with high stereoselectivity (up to 99 % yields, 99 : 1 er and >19 : 1 dr). In-depth mechanistic investigations, including control experiments and theoretical calculations, revealed the origin of the stereoselectivity and the importance of H-bonding in stereocontrol.
摘要：
A new fluorescent imaging probe indocyanine green-VC (ICG-VC) in the second near-infrared window (NIR-II) was fabricated based on the urokinase-type plasminogen activator receptor (uPAR) targeted polypeptide VC (VSNKYFSNIHWGC). The relative quantum yield (phi(F))was 0.34 %. The tail of its fluorescence emission wavelength exceeded 1000 nm with excellent photostability. In vitro cell analysis, MTT results indicated the high biocompatibility of ICG-VC with U87MG cells. ICG-VC showed good photothermal conversion behavior and photothermal stability.In vivo NIR-II fluorescence imaging, ICG-VC exhibited high spatiotemporal resolution in the lymphatic vessels with a high resolution of 717 mu m and signal-to-noise ratio of 4.36, and displayed an excellent U87MG tumor uptake within 4 h, which reached the maximum at 8 h with a signal-to-noise ratio of 5.32.
摘要：
The immune checkpoint blockade (ICB) antibody immunotherapy has demonstrated clinical benefits for multiple cancers. However, the efficacy of immunotherapy in tumors is suppressed by deficient tumor immunogenicity and immunosuppressive tumor microenvironments. Pyroptosis, a form of programmed cell death, can release tumor antigens, activate effective tumor immunogenicity, and improve the efficiency of ICB, but efficient pyroptosis for tumor treatment is currently limited. Herein, we show a mild hyperthermia-enhanced pyroptosis-mediated immunotherapy based on hollow carbon nanozyme, which can specifically amplify oxidative stress-triggered pyroptosis and synchronously magnify pyroptosis-mediated anticancer responses in the tumor microenvironment. The hollow carbon sphere modified with iron and copper atoms (HCS-FeCu) with multiple enzyme-mimicking activities has been engineered to induce cell pyroptosis via the radical oxygen species (ROS)-Tom20-Bax-Caspase 3-gasdermin E (GSDME) signaling pathway under light activation. Both in vitro and in vivo antineoplastic results confirm the superiority of HCS-FeCu nanozyme-induced pyroptosis. Moreover, the mild photothermal-activated pyroptosis combining anti-PD-1 can enhance antitumor immunotherapy. Theoretical calculations further indicate that the mild photothermal stimulation generates high-energy electrons and enhances the interaction between the HCS-FeCu surface and adsorbed oxygen, facilitating molecular oxygen activation, which improves the ROS production efficiency. This work presents an approach that effectively transforms immunologically "cold" tumors into "hot" ones, with significant implications for clinical immunotherapy.
通讯作者：
Prof. Liuyong Hu<&wdkj&>Prof. Wenling Gu<&wdkj&>Prof. Chengzhou Zhu<&wdkj&>Prof. Liuyong Hu Prof. Liuyong Hu Prof. Liuyong Hu<&wdkj&>Prof. Wenling Gu Prof. Wenling Gu Prof. Wenling Gu<&wdkj&>Prof. Chengzhou Zhu Prof. Chengzhou Zhu Prof. Chengzhou Zhu
作者机构：
[Mengzhen Xi; Zhichao Wu; Zhen Luo; Ling Ling; Weiqing Xu; Hengjia Wang; Qie Fang; Prof. Wenling Gu; Prof. Chengzhou Zhu; Mengzhen Xi Mengzhen Xi Mengzhen Xi; Zhichao Wu Zhichao Wu Zhichao Wu; Zhen Luo Zhen Luo Zhen Luo; Ling Ling Ling Ling Ling Ling; Weiqing Xu Weiqing Xu Weiqing Xu; Hengjia Wang Hengjia Wang Hengjia Wang; Qie Fang Qie Fang Qie Fang; Prof. Wenling Gu Prof. Wenling Gu Prof. Wenling Gu; Prof. Chengzhou Zhu Prof. Chengzhou Zhu Prof. Chengzhou Zhu] National Key Laboratory of Green Pesticide, International Joint Research Center for Intelligent Biosensing Technology and Health, College of Chemistry, Central China Normal University, Wuhan, 430079 P. R. China;[Prof. Liuyong Hu; Prof. Liuyong Hu Prof. Liuyong Hu Prof. Liuyong Hu] Hubei Key Laboratory of Plasma Chemistry and Advanced Materials, Hubei Engineering Technology Research Center of Optoelectronic and New Energy Materials, Wuhan Institute of Technology, Wuhan, 430205 P. R. China;[Runshi Xiao; Runshi Xiao Runshi Xiao Runshi Xiao] National Key Laboratory of Green Pesticide, International Joint Research Center for Intelligent Biosensing Technology and Health, College of Chemistry, Central China Normal University, Wuhan, 430079 P. R. China<&wdkj&>Hubei Key Laboratory of Plasma Chemistry and Advanced Materials, Hubei Engineering Technology Research Center of Optoelectronic and New Energy Materials, Wuhan Institute of Technology, Wuhan, 430205 P. R. China
通讯机构：
[Prof. Liuyong Hu; Prof. Liuyong Hu Prof. Liuyong Hu Prof. Liuyong Hu] H;[Prof. Wenling Gu; Prof. Chengzhou Zhu; Prof. Wenling Gu Prof. Wenling Gu Prof. Wenling Gu; Prof. Chengzhou Zhu Prof. Chengzhou Zhu Prof. Chengzhou Zhu] N;National Key Laboratory of Green Pesticide, International Joint Research Center for Intelligent Biosensing Technology and Health, College of Chemistry, Central China Normal University, Wuhan, 430079 P. R. China<&wdkj&>Hubei Key Laboratory of Plasma Chemistry and Advanced Materials, Hubei Engineering Technology Research Center of Optoelectronic and New Energy Materials, Wuhan Institute of Technology, Wuhan, 430205 P. R. China
摘要：
In conventional luminol electrochemiluminescence (ECL) systems, hydrogen peroxide and dissolved oxygen are employed as typical co-reactants to produce reactive oxygen species (ROS) for efficient ECL emission. However, the self-decomposition of hydrogen peroxide and limited solubility of oxygen in water inevitably restrict the detection accuracy and luminous efficiency of luminol ECL system. Inspired by ROS-mediated ECL mechanism, for the first time, we used cobalt-iron layered double hydroxide as co-reaction accelerator to efficiently activate water to generate ROS for enhancing luminol emission. Experimental investigations verify the formation of hydroxyl and superoxide radicals in the process of electrochemical water oxidation, which subsequently react with luminol anion radicals to trigger strong ECL signals. Finally, the detection of alkaline phosphatase has been successfully achieved with impressive sensitivity and reproducibility for practical sample analysis.
作者机构：
[Xu, Weiqing; Luo, Zhen; Fang, Qie; Zhu, Chengzhou; Xiao, Runshi; Xi, Mengzhen; Gu, Wenling; Wang, Hengjia; Wu, Zhichao; Ling, Ling] Cent China Normal Univ, Coll Chem, Int Joint Res Ctr Intelligent Biosensing Technol &, Natl Key Lab Green Pesticide, Wuhan 430079, Peoples R China.;[Xiao, Runshi; Hu, Liuyong] Wuhan Inst Technol, Hubei Engn Technol Res Ctr Optoelect & New Energy, Hubei Key Lab Plasma Chem & Adv Mat, Wuhan 430205, Peoples R China.
通讯机构：
[Prof. Liuyong Hu] H;[Prof. Wenling Gu; Prof. Chengzhou Zhu] N;National Key Laboratory of Green Pesticide, International Joint Research Center for Intelligent Biosensing Technology and Health, College of Chemistry, Central China Normal University, Wuhan, 430079 P. R. China<&wdkj&>Hubei Key Laboratory of Plasma Chemistry and Advanced Materials, Hubei Engineering Technology Research Center of Optoelectronic and New Energy Materials, Wuhan Institute of Technology, Wuhan, 430205 P. R. China
摘要：
In conventional luminol electrochemiluminescence (ECL) systems, hydrogen peroxide and dissolved oxygen are employed as typical co-reactants to produce reactive oxygen species (ROS) for efficient ECL emission. However, the self-decomposition of hydrogen peroxide and limited solubility of oxygen in water inevitably restrict the detection accuracy and luminous efficiency of luminol ECL system. Inspired by ROS-mediated ECL mechanism, for the first time, we used cobalt-iron layered double hydroxide as co-reaction accelerator to efficiently activate water to generate ROS for enhancing luminol emission. Experimental investigations verify the formation of hydroxyl and superoxide radicals in the process of electrochemical water oxidation, which subsequently react with luminol anion radicals to trigger strong ECL signals. Finally, the detection of alkaline phosphatase has been successfully achieved with impressive sensitivity and reproducibility for practical sample analysis.
摘要：
The synthesis of chiral endocyclic allenes, especially the medium-sized ones, remains a challenge in allene chemistry due to unfavorable tension and difficult stereocontrol. Herein, an efficient protocol for the construction of chiral nine-membered endocyclic allenes via palladium-catalyzed asymmetric cycloaddition/Cope rearrangement relay of vinyl carbonates with activated enynes is highlighted. This process provides rapid access to a variety of chiral nine-membered endocyclic allenes in good yields with excellent enantioselectivities. In particular, a chiral P,S-ligand shows good performance on stereoinduction, generating central and axial chirality in a single transformation, which is rationalized by DFT calculations and by a proposed transition state.
1 Introduction
2 Pd-Catalyzed Asymmetric Cycloaddition/Cope Rearrangement Relay
3 Plausible Mechanism and Stereochemical Outcome
4 Conclusion and Outlook
摘要：
Copper, an essential micronutrient, controls multiple fundamental processes throughout all forms of life, such as respiration, cell proliferation and neurotransmitter biosynthesis. High redox activity makes copper a double-edged sword for cell survival, and abnormal copper metabolism is commonly associated with cancer and other diseases. Recently, advances in copper biology have forged new links between researchers from different disciplines to dissect the use of copper targets in cancer treatment. Copper is crucial for maintaining the rapid growth and proliferation of cancer cells, a process known as ‘cuproplasia’. However, excess mitochondrial copper accumulation also triggers ‘cuproptosis’, a new form of programmed cell death, involving the destabilization of Fe-S cluster proteins and the aggregation of DLAT. Accordingly, both activating cuproptosis by copper ionophores and suppressing cuproplasia through copper depletion are noteworthy anticancer options, but this field currently lacks systematic reviews from both biological and chemical perspectives. This review provides a comprehensive overview of the leading known copper biology and copper-targeted cancer therapy, focusing on copper homeostasis, signal transduction, and copper overload/depletion, which should be beneficial for the development of the next-generation of inorganic anticancer drugs. We expect that our review will provide a balanced perspective to the development and comprehension of copper-based cancer therapy.
通讯作者：
Sheng Hua Liu<&wdkj&>Jing Zhang<&wdkj&>Sheng Hua Liu Sheng Hua Liu Sheng Hua Liu<&wdkj&>Jing Zhang Jing Zhang Jing Zhang
作者机构：
[Hang Zou; Jing Zhang; Hang Zou Hang Zou Hang Zou; Jing Zhang Jing Zhang Jing Zhang] Department of Laboratory Medicine, Nanfang Hospital, Southern Medical University, Guangzhou, Guangdong, China;[Junyi Gong; Junyi Gong Junyi Gong Junyi Gong] School of Science and Engineering, Shenzhen Institute of Aggregate Science and Technology, The Chinese University of Hong Kong, Shenzhen, Guangdong, China;[Sheng Hua Liu; Sheng Hua Liu Sheng Hua Liu Sheng Hua Liu] Key Laboratory of Pesticide and Chemical Biology, Ministry of Education, College of Chemistry, Central China Normal University, Wuhan, Hubei, China;College of Chemical Engineering, Shijiazhuang University, Shijiazhuang, P. R. China;[Xiao-Yan Wang; Xiao-Yan Wang Xiao-Yan Wang Xiao-Yan Wang] Key Laboratory of Pesticide and Chemical Biology, Ministry of Education, College of Chemistry, Central China Normal University, Wuhan, Hubei, China<&wdkj&>Department of Laboratory Medicine, Nanfang Hospital, Southern Medical University, Guangzhou, Guangdong, China<&wdkj&>College of Chemical Engineering, Shijiazhuang University, Shijiazhuang, P. R. China
通讯机构：
[Sheng Hua Liu; Sheng Hua Liu Sheng Hua Liu Sheng Hua Liu] K;[Jing Zhang; Jing Zhang Jing Zhang Jing Zhang] D;Department of Laboratory Medicine, Nanfang Hospital, Southern Medical University, Guangzhou, Guangdong, China<&wdkj&>Key Laboratory of Pesticide and Chemical Biology, Ministry of Education, College of Chemistry, Central China Normal University, Wuhan, Hubei, China
摘要：
Long‐lived luminescent materials have attracted considerable attention from researchers. However, how to build long‐lived materials in solution still remains a challenge. In this work, a new class of gold(I) complexes have been designed and showed unprecedented aggregation‐induced conversion from TADF to phosphorescence. Their long millisecond lifetime in aggregate also made them excellent candidates in cell imaging. Abstract Long‐lived luminescent materials possess wide application prospects in various areas, but their constructions still face a huge challenge, especially the achievement in solution. Manipulating aggregate is an effective method to attain intriguing luminescence, thus it is expected to build long‐lived materials in solution. In this work, a series of new gold(I) complexes were developed by employing unique carbazole and phosphine as the ligands, and these resulting systems exhibited rare long lifetimes of milliseconds in the aggregate state. It was well unveiled that these complexes emitted blue thermally activated delayed fluorescence (TADF) with the lifetimes of several microseconds in dilute solution; while orange‐red phosphorescence with much longer lifetimes of several milliseconds were achieved in the aggregate state. To our knowledge, this is the first implementation of aggregation‐induced conversion from TADF to phosphorescence. Based on their excellent luminescent properties, we successfully applied these complexes in cell imaging and inhibition of cancer cells.
摘要：
Achieving fast transmembrane transmission of molecules in organisms is a challenging problem. Inspired by the transport of Dopmine (DA) in organisms, the DA transporter (DAT) binds to DA in a way that has a ring recognition (the recognition group is the tryptophan group). Herein, D-Tryptophan-pillar[5]arene (D-Trp-P5) functionalized conical nanochannel is constructed to achieve fast transmission of DA. The D-Trp-P5 functionalized nanochannel enables specific wettability recognition of DA molecules and has great cycle stability. With the controlling of voltage to wettability, the transport flux of DA is up to 499.73 nmol cm(-2) h(-1) at -6 V, 16.88 times higher than that under positive voltages. In response to these results, a high-throughput DA transport device based on controlled electricity-wettability is provided.
期刊：
Chemical Papers,2023年77(11):6763-6771 ISSN：2585-7290
通讯作者：
Sun, Y;Zhang, AD
作者机构：
[Zhou, Ya-Qing; Sun, Yong; Wang, Ji-Li; Sun, Y; Wu, Wen-Hai] Hanjiang Normal Univ, Coll Chem & Environm Engn, Shiyan 442000, Peoples R China.;[Zhang, Aidong; Duan, Jiang] Cent China Normal Univ, Coll Chem, Wuhan 430079, Peoples R China.
通讯机构：
[Zhang, AD ] C;[Sun, Y ] H;Hanjiang Normal Univ, Coll Chem & Environm Engn, Shiyan 442000, Peoples R China.;Cent China Normal Univ, Coll Chem, Wuhan 430079, Peoples R China.
关键词：
Aqueous film-forming foam;Formulation;Short-chain perfluorinated surfactant;Extinguishing time;Burnback time
摘要：
As the essential component(s), long-chain perfluorinated or short-chain perfluorinated ionic surfactants are required for effective aqueous film-forming foam (AFFF); nevertheless, the associated qualities of persistent pollution and toxicity have raised significant concerns. It has become critical to develop alternatives to the present fluorine component for AFFF to offset the negative effects. In this study, a short-chain perfluorinated nitrogen-heterocyclic nonionic amine oxide surfactant was combined with hydrocarbon surfactants and additives to prepare an AFFF concentrate. A laboratory technique was developed to evaluate the influence of ingredients on the performance of a 6% AFFF diluent, resulting in an improved AFFF formulation. The performance parameters for pool fire extinguishment and fire resistance of the AFFF formulation were encouraging, including a spreading coefficient of 5.4, foam expansion of 8.11, 25% drainage time of 4.6 min, extinguishing times for forceful application of 58 s, and fire burnback time of 18.6 min. In addition, the AFFF concentrate showed significant freezing resistance when stored at - 20 & DEG;C for an extended period of time. The formulation outperformed the technical standard criteria and has the potential to be used as a novel AFFF agent. [GRAPHICS]
作者机构：
[Yuhua Zhu; Leyi Yang; Yarong Fang; Ji Yang; Xiaoping Chen; Juan Zheng; Shuhong Zhang; Wei Chen; Chuanqi Pan; Baojian Zhang; Xiaofeng Qiu; Yuhua Zhu Yuhua Zhu Yuhua Zhu; Leyi Yang Leyi Yang Leyi Yang; Yarong Fang Yarong Fang Yarong Fang; Ji Yang Ji Yang Ji Yang; Xiaoping Chen Xiaoping Chen Xiaoping Chen; Juan Zheng Juan Zheng Juan Zheng; Shuhong Zhang Shuhong Zhang Shuhong Zhang; Wei Chen Wei Chen Wei Chen; Chuanqi Pan Chuanqi Pan Chuanqi Pan; Baojian Zhang Baojian Zhang Baojian Zhang; Xiaofeng Qiu Xiaofeng Qiu Xiaofeng Qiu] Key Laboratory of Pesticide & Chemical Biology of Ministry of Education, Institute of Environmental and Applied Chemistry, Engineering Research Center of Photoenergy Utilization for Pollution Control and Carbon Reduction, Ministry of Education, College of Chemistry, Central China Normal University, Wuhan, Hubei, 430082 P. R. China;Wuhan Institute of Photochemistry and Technology, 7 North Bingang Road, Wuhan, Hubei, 430082 P. R. China;[Jiami Ma; Jiami Ma Jiami Ma Jiami Ma] School of Resources and Environmental Engineering, Wuhan University of Technology, Wuhan, 430070 P. R. China;[Zhu Luo; Jinlong Wang; Yanbing Guo; Zhu Luo Zhu Luo Zhu Luo; Jinlong Wang Jinlong Wang Jinlong Wang; Yanbing Guo Yanbing Guo Yanbing Guo] Key Laboratory of Pesticide & Chemical Biology of Ministry of Education, Institute of Environmental and Applied Chemistry, Engineering Research Center of Photoenergy Utilization for Pollution Control and Carbon Reduction, Ministry of Education, College of Chemistry, Central China Normal University, Wuhan, Hubei, 430082 P. R. China<&wdkj&>Wuhan Institute of Photochemistry and Technology, 7 North Bingang Road, Wuhan, Hubei, 430082 P. R. China
通讯机构：
[Yanbing Guo; Yanbing Guo Yanbing Guo Yanbing Guo] K;Key Laboratory of Pesticide & Chemical Biology of Ministry of Education, Institute of Environmental and Applied Chemistry, Engineering Research Center of Photoenergy Utilization for Pollution Control and Carbon Reduction, Ministry of Education, College of Chemistry, Central China Normal University, Wuhan, Hubei, 430082 P. R. China<&wdkj&>Wuhan Institute of Photochemistry and Technology, 7 North Bingang Road, Wuhan, Hubei, 430082 P. R. China
摘要：
Catalytic ozone (O3) decomposition at high relative humidity (RH) remains a great challenge due to the catalysts poison and deactivation under high humidity. Here, we firstly elaborate the role of water activation and the corresponding mechanism of the promoted O3 decomposition over the three-dimensional monolithic molybdenum oxide/graphdiyne (MoO3/GDY) catalyst. The O3 decomposition over MoO3/GDY reaches up to 100 % under high humid condition (75 % RH) at room temperature, which is 4.0 times as high as that of dry conditions, significantly surpasses other carbon-based MoO3 materials(≤7.1 %). The sp-hybridized carbon in GDY donates electrons to MoO3 along the C−O−Mo bond, facilitating water activation to form hydroxyl species. As a result, hydroxyl species dissociated from water act as new active sites, promoting the adsorption of O3 and the generation of new intermediate species (hydroxyl ⋅OH and superoxo ⋅O2−), which significantly lowers the energy barriers of O3 decomposition (0.57 eV lower than dry conditions).
摘要：
A sensitive extraction and instrumental method was established to detect topramezone and its metabolite (M670H05) in maize and animal-origin foods. Two years of field experiments were carried out to study the dissipation dynamics of topramezone in maize straw, and their residue levels of actual samples collected from the supermarket were determined. They were extracted using liquid-liquid extraction (LLE), and ultra-high-performance liquid chromatography-tandem mass spectrometry was used for detection. The limit of quantification was 0.005 mg kg(-1). Recoveries ranged between 73.8% and 109.9% at 3 spiking levels with intraday relative standard deviation (RSD) <= 17.7% and the inter-day <= 18.1%, which meets the requirements of SANTE/12682/2019. Dissipation dynamics experiment showed that, the deposition of topramezone in maize straw in Jilin were <0.005-0.62 mg kg(-1)with 28 days after application. And the residue level of market samples were all less than 0.005 mg kg(-1), much lower than the MRLs (range from 0.01 to 0.8 mg kg(-1)) set by European Union, United States Food and Drug Administration, China, and Canada. This method was effective to analyse the residues of topramezone and M670H05.
摘要：
A compact 4-port coplanar waveguide (CPW) fed ultra-wideband (UWB) multiple-input-multiple-output (MIMO) antenna with enhanced isolation is proposed to operate from 3.66 GHz to 16.61 GHz with 127.78% impedance bandwidth. The proposed antenna system consists of 4 orthogonal arrays of monopole antennas improved by four iterations. The UWB characteristic of the antenna is obtained from an improved monopole antenna fed by CPW. The final MIMO antenna is machined on a Rogers 4003C substrate with dimensions of 60 x 60 x 0.3 mm(3). The orthogonal arrangement of antennas brings about the polarization diversity and certain isolation of MIMO antennas. Four rows of orthogonal metasurface elements with via holes and the ring of the backplane further improve the isolation between antenna elements in the MIMO system. The MIMO antenna has an impedance bandwidth of 12.95 GHz with S-11 < -10 dB and good isolation (S-21 =S-41 < -30 dB and S-31 < -20 dB). In particular, S31 is always less than -25 dB at frequencies greater than 6 GHz. The measured results of MIMO antenna agree with the simulated results. The optimized MIMO antenna has excellent performance in many aspects, such as UWB, compact size, omnidirectional radiation, enhanced isolation and high efficiency, which means that it has application potential in UWB wireless communication systems.
