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Bimetal MOF-derived NiFe-P nanocomposites coupled with Cu_(3)P nanoparticles to construct tandem electron transfer channels for photocatalytic hydrogen evolution

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Journal of Environmental Sciences 2024年第3期137卷 333-346页

作者： Haiyan Zhang shitao Yang Peng Zhu Senpei Tang Ming li College of Chemistry and Chemical Engineering Jishou UniversityJishou 416000China School of Account Hunan University of Technology and BusinessChangsha 410205China

Finely modulated light-induced charge separation and transfer is a central challenge to achieve efficient photocatalysis.Although progress has been made in this field,most of the previous research works focused on the separation or migration of photogenerated carriers but did not build a bridge between the two.How to realize the strong driving and precise migration of carriers has become the focus of our work.We report an ingeniously designed ternary heterojunction.Taking NiFe-MOF as the“parent material”,the FeP_(4)/Ni_(x)P_(y)heterojunction is derived in situ while maintaining the frame structure through gas-solid reaction,and finally the Z-type electron transfer is realized.With Cu_(3)P anchoring spindle matrix,an electron transport tunnel is opened up in Cu_(3)P/FeP_(4)/Ni_(x)P_(y)ternary heterojunction under the action of p-n heterojunction built-in electric field driving and accurate energy band matching.The strong driving force of the built-in electric field provides an inexhaustible power for the transmission of electrons,and the fine series of electron transmission channels realizes the precise transmission of electrons.The above fine design makes the perfect fit between the built-in electric field and the electron transfer channel,which not only effectively improves the embarrassing situation of insufficient electron driving force of hydrogen evolution reaction in the previous research,but also makes up for the weakening of semi-conductor reduction ability caused by the construction of traditional p-n heterostructures.This research work provides a new idea for the construction of multiple heterostructures and the design of fine interface engineering in the future.

关键词： Cu_(3)P/FeP_(4)/Ni_(x)P Built-in electric field Electron transfer channels Photocatalysis

Formation of hierarchical Si3N4 foams by protein-based gelcasting and chemical vapor infiltration

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Journal of Advanced Ceramics 2021年第1期10卷 187-193页

作者： Junsheng li Qiuping YU Duan li liang ZENG shitao GAO Science and Technology on Advanced Ceramic Fibers and Composites Laboratory College of Aerospace Science and EngineeringNational University of Defense TechnologyChangsha 410073China

Silicon nitride foams with a hierarchical porous structure was formed by the combination of protein-based gelcasting,chemical vapor infiltration,and in-situ growth of silicon nitride nanowires.The porosity of the foams can be controlled at 76.3-83.8 vol%with an open porosity of 70.2—82.8 vol%.The pore size distribution was presented in three levels:licon nitride nanowires(SNNWs)),10—50μm(cell windows),and>100μm(cells).The resulted compressive strength of the porous bodies at room temperature can achieve up to 18.0±1.0 MPa(porosity=76.3 vol%)while the corresponding retention rate at 800℃was 58.3%.Gas permeability value was measured to be 5.16(cm^(3)·cm)/(cm^(2)·s·kPa).The good strength,high permeability together with the pore structure in multiple scales enabled the foam materials for microparticle infiltration applications.

关键词： ceramics sintering porosity mechanical properties permeability

LECF: recommendation via learnable edge collaborative filtering

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Science China(Information Sciences) 2022年第1期65卷 116-130页

作者： shitao XIAO Yingxia SHAO Yawen li Hongzhi YIN Yanyan SHEN Bin CUI School of Computer Science (National Pilot Software Engineering School) Beijing University of Posts and Telecommunications Beijing Key Lab of Intelligent Telecommunications Software and Multimedia Beijing University of Posts and Telecommunications School of Information Technology and Electrical Engineering The University of Queensland Department of Computer Science and Engineering Shanghai Jiao Tong University Department of Computer Science and Technology Peking University National Engineering Laboratory for Big Data Analysis and Applications Peking University

The core of recommendation models is estimating the probability that a user will like an item based on historical interactions. Existing collaborative filtering(CF) algorithms compute the likelihood by utilizing simple relationships between objects, e.g., user-item, item-item, or user-user. They always rely on a single type of object-object relationship, ignoring other useful relationship information in data. In this paper, we model an interaction between user and item as an edge and propose a novel CF framework, called learnable edge collaborative filtering(LECF). LECF predicts the existence probability of an edge based on the connections among edges and is able to capture the complex relationship in data. Specifically, we first adopt the concept of line graph where each node represents an interaction edge; then calculate a weighted sum of similarity between the query edge and the observed edges(i.e., historical interactions) that are selected from the neighborhood of query edge in the line graph for a recommendation. In addition, we design an efficient propagation algorithm to speed up the training and inference of LECF. Extensive experiments on four public datasets demonstrate LECF can achieve better performance than the state-of-the-art methods.

关键词： collaborative filtering recommender system implicit feedback edge-edge similarity line graph

Chitosan-based carbon dots with multi-color-emissive tunable fluorescence and visible light catalytic enhancement properties

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Nano Research 2023年第2期16卷 1835-1845页

作者： Qiong Wu Shouyun Zhang Shuang li Yan Yan shitao Yu Ruiyang Zhao Lang Huang State Key Laboratory Base of Eco-Chemical Engineering College of Chemical EngineeringQingdao University of Science and TechnologyQingdao 266042China Qingdao Institute of Bioenergy and Bioprocess Technology Chinese Academy of SciencesQingdao 266101China

Carbon quantum dots(CQDs)are receiving increasing attention for their excellent photostability,low toxicity,and tunable fluorescence performance,but it is still challenging to prepare full-spectrum CQDs using only one single set of precursor and solvent.In this study,P and N co-doped carbon dots(N,PR-CQDs)with multi-color-emissive tunable fluorescence from blue to green and orange were synthesized from bio-based chitosan,employing phosphoric acid as solvent and dopant.The introduction of phosphoric acid successfully shortens the manufacturing reaction time,and the heteratomic functional groups of P–O/P=O on surface of carbon dots enrich the surface defect states,promoting n–π*transition,and therefore changing their electron structure/energy level to reduce the band gap,thus facilitating emission at long wavelength.Specifically,increasing phosphoric acid concentration leads to characteristic excitation peaks red shift from 320 to 420 nm with the characteristic emission peaks red shift from 406 to 503 nm.A new emission peak at 610 nm appears,enabling N,PR-CQDs exhibit double emission peaks with fluorescence color from green to yellow to orange.After compositing with carbon nitride(g-C3N4),N,PR-CQDs work as photosensitizer and effectively narrow the energy gap(Eg)of g-C3N4 from 2.75 to 2.40 eV,endowing the photocatalyst higher visible light capture ability and broader light response region.The photocatalytic degradation rate of rhodamine B(RhB)under visible light irradiation reaches up to 98.39%within 60 min using N,P20%-CQDs/g-C3N4 as catalyst,which is 1.4 times that of pure g-C3N4,and it is demonstrated that·O2−is the major active substance contributing for RhB degradation by de-ethyl and aromatic ring breakage.

关键词： carbon dots multicolor luminescence chitosan visible light catalysis photosensitizer

Nano High Entropy Alloy Catalyst-A New Technology

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材料导报 2021年第22期35卷 I0001-I0002页

作者： ZHANG shitao li Wenge The Merchant Marine College Shanghai Maritime UniversityShanghai 201306China

Traditional material design concept has limited the development of higher performance catalysts.As a type of multi-element material,the high-entropy alloy(HEA),renovates the traditional alloy concept and exhibits excellent catalytic activity due to the high configuration entropy and catalytic stability.The nanoparticles(NPs)like Ru-NPs,Pt-NPs with a diameter of less than 10 nm have a better catalytic effect than large-size catalysts.Recently,the synergistic catalytic effect of HEA and NPs has been of great interest to researchers,creating a kind of new catalytic materials,namely HEA-NPs composites[1-2].

关键词： stability alloy catalytic

TRIM65 E3 ligase targets VCAM-1 degradation to limit LPS-induced lung inflammation

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Journal of Molecular Cell Biology 2020年第3期12卷 190-201页

作者： Yong li Xuan Huang Fang Guo Tianhua Lei Shitao Li Paula Monaghan-Nichols Zhisheng jiang Hong-Bo Xin Mingui Fu Department of Biomedical Science School of MedicineUniversity of Missouri-Kansas CityKansas CityMO 64108USA Institute of Translational Medicine Nanchang UniversityNanchang 330031China Institute of Cardiovascular Diseases Department of PathophysiologyHengyang Medical CollegeUniversity of South ChinaHengyang A21001China Department of Physiological Sciences Center for Veterinary and Health sciencesOklahoma State UniversityStillwaterOK 7A078USA

Although the adhesion molecules-mediated leukocyte adherence and infiltration into tissues is an important step of inflammation,the post-translational regulation of these proteins on the endothelial cells is poorly understood.Here,we report that TRIM65,an ubiquitin E3 iigase of tripartite protein family,selectively targets vascular cell adhesion molecule 1(VCAM-1)and promotes its ubiq-uitination and degradation,by which it critically controls the duration and magnitude of sepsis-induced pulmonary inflammation.TRIM65 is constitutively expressed in human vascular endothelial cells.During TNFa-induced endothelial activation,the protein levels ofTRIM65 and VCAM-1 are inversely correlated.Expression of wild-type TRIM65,but not expression of aTRIM65 mutant that lacks E3 ubiquitin ligase function in endothelial cells,promotes VCAM-1 ubiquitination and degradation,whereas small interference RNA-mediated knockdown of TRIM65 attenuates VCAM-1 protein degradation.Further experiments show that TRIM65 directly interacts with VCAM-1 protein and directs its polyubiquitination,by which TRIM65 controls monocyte adherence and infiltration into tissues during inflammation.Importantly,TRIM65-deficient mice are more sensitive to lipopolysaccharide-induced death,due to sustained and severe pulmonary inflammation.Taken together,our studies suggest that TRIM65-mediated degradation of VCAM-1 represents a potential mechanism that controls the duration and magnitude of infiammation.

关键词： TRIM65 VCAM-1 endothelial activation lung inflammation ubiquitination

A dual metal-organic framework strategy for synthesis of FeCo@NC bifunctional oxygen catalysts for clean energy application

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Chinese Journal of Chemical Engineering 2022年第3期35卷 161-168页

作者： Jun Chen liandong li liu Yang Chang Chen shitao Wang Yan Huang Dapeng Cao State Key Laboratory of Organic-Inorganic Composites Beijing University of Chemical TechnologyBeijing 100029China

Developing high efficient bifunctional oxygen electrocatalysts for clean energy applications like Zin-air battery(ZAB)is highly desired,because it would reduce the cost and speed up the practical application of ZAB.Here we use a dual metal-organic framework(MOF)synthesis strategy to prepare the N-doped carbon supported bimetallic FeCo nanoparticle catalysts(marked as FeCo@NC)by pyrolysis of Zn CoZIF/MIL-101(Fe)composite.The FeCo@NC exhibits remarkable electrocatalytic activity for ORR with half-wave potential of 0.89 V vs.the reversible hydrogen electrode(RHE)and robust durability for both ORR and OER(oxygen reduction reaction and oxygen evolution reaction),which is attributed to the generation of Fe_(0.26)Co_(0.74) crystalline phase and mesopores due to the dual-MOF synthesis strategy.The rechargeable ZAB based on FeCo@NC air electrode shows a maximum energy density of139.6 mW·cm^(-2) and excellent cyclic stability over 130 h,significantly surpassing the Pt and Ir-based ZAB.The present work provides a useful dual-MOF synthesis strategy for preparing high-performance multifunctional catalysts for ORR,OER and hydrogen evolution reaction(HER).

关键词： Metal Organic Frameworks Zeolite imidazole framework Bifunctional electrocatalysts FeCo alloy Zn-air battery

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认同的现代之维:泰勒对现代认同的研究

外国文学 2023年第4期 97-106页

作者：李世涛北京外国语大学中文学院北京100089

泰勒的研究表明,认同在现代社会中发挥着巨大的作用,自我认同是现代认同的核心;现代认同经历了一个历史的发展过程,不但深刻地影响了个体的体验、意义感、价值,而且还对个体的选择、生活模式与现代社会产生了巨大的影响。现代认同与现... 详细信息

泰勒的研究表明,认同在现代社会中发挥着巨大的作用,自我认同是现代认同的核心;现代认同经历了一个历史的发展过程,不但深刻地影响了个体的体验、意义感、价值,而且还对个体的选择、生活模式与现代社会产生了巨大的影响。现代认同与现代人、现代生活的实践是一种复杂的互动关系。泰勒从“自我”介入研究,梳理了自我形成的两条线索,即“分解自我”式的线索和“自我探索模式”的线索,进而分析了自我理解的问题。他的研究能够推动我们深入地理解西方的现代认同、精神、观念、自我、审美、现代性和审美现代性等议题。

关键词：现代认同现代性分期生活模式

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朱光潜的当代美学研究的转向

四川大学学报:哲学社会科学版 2023年第5期 169-178,199,200页

作者：李世涛北京外国语大学中文学院北京100089

新中国成立以后,朱光潜的美学研究发生了四个转向,即翻译西方美学资料、研究哲学美学、研究马克思主义美学与文论、中西方文化与文明及其比较研究。这样,朱光潜以其丰富的资料翻译和研究成果奠定了中国的西方美学研究的学科基础,推动了... 详细信息

新中国成立以后,朱光潜的美学研究发生了四个转向,即翻译西方美学资料、研究哲学美学、研究马克思主义美学与文论、中西方文化与文明及其比较研究。这样,朱光潜以其丰富的资料翻译和研究成果奠定了中国的西方美学研究的学科基础,推动了以美的本质、美学基本原理为重要成果的哲学美学的研究,提高了马克思主义美学、文论的资料建设和研究水平,在美学界开启并促进了对中西方文化、文明及其比较的研究,推进了中西方美学、文艺、文化、学术的交流。朱光潜以美学家、理论家的身份介入当代文艺、哲学、文化问题的讨论,推动了中国当代文艺、文化实践的发展,并以开阔的视野和规范的研究引领、提升了中国当代人文学术的发展。他的研究转向是时代变迁与个人选择、主观与客观因素共同作用的结果,既包含偶然性也有其必然性。全面、客观地还原这四个转向,并以此为基础深入研究、评估其转变效果,有助于科学地理解、评价他的研究,也能够由此反映中国当代美学发展的轨迹。

关键词：朱光潜当代美学研究中国当代美学中国当代学术史