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Enhancement of two-photon absorption cross section and singlet-oxygen generation in porphyrin-cored star polymers

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Science China Chemistry 2009年第1期52卷 56-63页

作者： WAN Yan JIA Ke li binsong BO ZhiShan XIA AnDong State Key Laboratory of Molecular Reaction Dynamics and Beijing National Laboratory for Molecular Sciences(BNLMS)Institute of ChemistryChinese Academy of SciencesBeijing 100080China State Key Laboratory of Polymer Physics and Chemistry and Beijing National Laboratory for Molecular Sciences(BNLMS)Institute of ChemistryChinese Academy of SciencesBeijing 100080China

We report a newly synthesized polymer of a star-shaped porphyrin compound(TPA-FxP) with four oligofluorene arms at its meso positions with the pronounced enhancement of the two-photon properties and the generation of singlet oxygen by utilizing the two-photon excited fluorescence resonance energy *** steady-state spectra and transient triplet-triplet absorption spectra give evidence that the enhanced two-photon absorption cross section results from not only the through-space energy transfer(Frster) but also the through-bond energy transfer between conjugated peripheral oligofluorene arms and the porphyrin *** two-photon absorption cross section at 780 nm up to 3360 GM(1 GM = 10-50 cm4·s/photon) of TPA-FxP was obtained,which is comparable to the highest values reported from other similar chemically modified porphyrin core ***,the enhanced production of singlet oxygen under two-photon absorption conditions is also reported.

关键词： porphyrin-cored star polymer two-photon excitation energy transfer

Recyclable adsorbent of BiFeO_3/Carbon for purifying industrial dye wastewater via photocatalytic reproducible

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Green Energy & Environment 2019年第1期4卷 66-74页

作者： Shuang Jiao Yiming Zhao Chensha li binsong Wang Yang Qu Key Laboratory of Functional Inorganic Materials Chemistry (Heilongjiang University) Ministry of Education School of Chemistry and Materials ScienceInternational Joint Research Center for Catalytic Technology Key Laboratory of Functional Inorganic Materials Chemistry(Heilongjiang University) Ministry of Education School of Chemistry and Materials ScienceInternational Joint Research Center for Catalytic Technology

It is essential to prepare highly-efficiency reproducible adsorbent for purifying industrial dye wastewater. In this work, biscuit with a layered porous structure as a template is applied to prepare a photocatalytic recyclable adsorbent of BiFeO3/Carbon nanocomposites for purifying simulative industrial dye wastewater. It is found that the structure of the prepared BiFeO3/Carbon nanocomposite is related to the natural structure of the biscuit, annealing temperatures and immersing times, demonstrated by XRD, TEM, UV-Vis and adsorptive activities. Kinetics data shows that the adsorption rate of the adsorbent to the dye is rapid and fitted well with the pseudo-second-order model, that more than 80% of dyes can be removed in the beginning 30 min. The adsorption isotherm can be perfectly described by the Langmuir model as well. It can be seen from the adsorption data that the adsorption performance can reach over 90% at pH ? 2–12, which can imply its universal utilization. The prepared BiFeO_3/Carbon nanocomposites have also displayed excellent capacities(over 90% within 30 min) for adsorption of seven different dyes and their mixed one. According to the five times photocatalytic reproducible experiments, it is proved that BiFeO_3/Carbon nanocomposites show the excellent stability and reproduction for purifying simulative industrial dyes, even the sample have been placed for one year. These research results indicate that the adsorbent BiFeO_3/Carbon can be a suitable material used in treating industrial dye wastewater potentially.

关键词： Reproducible adsorbent BiFeO3/Carbon nanocomposites Photocatalysis Purifying industrial dye wastewater Pseudo-second-order model

An improved strain-softening constitutive model of granite considering the effect of crack deformation

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Journal of Rock Mechanics and Geotechnical Engineering 2024年第4期16卷 1202-1215页

作者： Yapeng li Qiang Zhang Qiuxin Gu Peinan Wu binsong Jiang State Key Laboratory for Geomechanics and Deep Underground Engineering School of Mechanics and Civil EngineeringChina University of Mining and TechnologyXuzhou221116China

This paper presents an improved strain-softening constitutive model considering the effect of crack deformation based on the triaxial cyclic loading and unloading test *** improved model assumes that total strain is a combination of plastic,elastic,and crack *** constitutive relationship between the crack strain and the stress was further *** evolutions of mechanical parameters,*** parameters,dilation angle,unloading elastic modulus,and deformation parameters of crack,with the plastic strain and confining pressure were *** the increase in plastic strain,the cohesion,friction angle,dilation angle,and crack Poisson's ratio initially increase and subsequently decrease,and the unloading elastic modulus and the crack elastic modulus nonlinearly *** increasing confining pressure enhances the strength and unloading elastic modulus,and decreases the dilation angle and Poisson's ratio of the *** theoretical triaxial compressive stress-strain curves were compared with the experimental results,and they present a good agreement with each *** improved constitutive model can well reflect the nonlinear mechanical behavior of granite.

关键词： Strain-softening Crack deformation effect Plastic shear strain Constitutive model

Effect of Co-polyester antistatic agent modified by carbon nanotubes on the properties of polypropylene fibers

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Journal of University of Science and Technology Beijing 2007年第6期14卷 573-579页

作者： Chensha li binsong Wang Weizhe Lu Dazhi Wang Zhi li Zechao Di Ji liang Department of Mechanical Engineering Tsinghua University Beijing 100084 China School of Chemistry and Materials Science Heilongjiang University Harbin 150080 China

Antistatic polymer fibers were investigated by using carbon nanotubes （CNTs） to enhance the antistatic ability of inner antistatic agents based on the mechanism of attracting moisture by polar radical groups. It is indicated that the antistatic ability of the fibers filled with composite antistatic agents that contain CNTs and organic antistatic agents was superior to that of the fibers filled either with pure organic antistatic agents or pure CNTs. The antistatic ability of the composite antistatic agent fabricated by an in situ process was superior to that of the composite antistatic agent fabricated by direct dispersing CNTs in the antistatic agent carrier. Moreover, the heat-treated CNTs could further enhance the antistatic effect compared with the initial CNTs. The antistatic effect is significantly influenced by the content of CNTs in the composite antistatic agent.

关键词： carbon nanotube polypropylene fiber antistatic agent in situ process

New true-triaxial rock strength criteria considering intrinsic material characteristics

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Acta Mechanica Sinica 2018年第1期34卷 130-142页

作者： Qiang Zhang Cheng li Xiaowei Quan Yanning Wang liyuan Yu binsong Jiang State Key Laboratory for Geomechanics and Deep Underground Engineering School of Mechanics and Civil Engineering China University of Mining and Technology

A reasonable strength criterion should reflect the hydrostatic pressure effect, minimum principal stress effect,and intermediate principal stress effect. The former two effects can be described by the meridian curves, and the last one mainly depends on the Lode angle dependence function. Among three conventional strength criteria, ***–Coulomb(MC), Hoek–Brown(HB), and Exponent(EP) criteria, the difference between generalized compression and extension strength of EP criterion experience a firstly increase then decrease process, and tends to be zero when hydrostatic pressure is big enough. This is in accordance with intrinsic rock strength characterization. Moreover, the critical hydrostatic pressure Icorresponding to the maximum difference of between generalized compression and extension strength can be easily adjusted by minimum principal stress influence parameter K. So, the exponent function is a more reasonable meridian curves, which well reflects the hydrostatic pressure effect and is employed to describe the generalized compression and extension ***, three Lode angle dependence functions of L,L, and L, which unconditionally satisfy the convexity and differential requirements, are employed to represent the intermediate principal stress effect. Realizing the actual strength surface should be located between the generalized compression and extension surface, new true-triaxial criteria are proposed by combining the two states of EP criterion by Lode angle dependence function with a same lode angle. The proposed new true-triaxial criteria have the same strength parameters as EP criterion. Finally, 14 groups of triaxial test data are employed to validate the proposed criteria. The results show that the three new true-triaxial exponent criteria,especially the Exponent Willam-Warnke criterion(EPWW)criterion, give much lower misfits, which illustrates that the EP criterion and Lhave more reasonable meridian and deviatoric function form, respectively.

关键词： Rock Strength criterion Meridian plane Lode angle dependence Convexity

Fabrication of N-CQDs@W_(18)O_(49) heterojunction with enhanced charge separation and photocatalytic performance under full-spectrum ligh irradiation

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Chinese Chemical Letters 2021年第10期32卷 3180-3184页

作者： Ju Huang Jiawen Wang Zhengjia Hao Chensha li binsong Wang Yang Qu Department of Environmental Science School of Chemistry and Materials ScienceKey Laboratory of Functional Inorganic Material ChemistryMinistry of Education of the People’s Republic of ChinaHeilongjiang UniversityHarbin 150080China

Increasing the charge separation and the utilization efficiency of sunlight are essential factors in a photocatalytic *** this study,we prepared crystalline N-CQDs@W_(18) O_(49) heterostructures,through the in situ growth of W_(18) O_(49) nanocrystals on nitrogen-doped carbon quantum dots(N-CQDs).N-CQDs@W_(18) O_(49) nanocomposites showed high activity in the photodegradation of ciprofloxacin(CIP)and methyl orange(MO).The photodegradation activity of the optimized N-CQDs@W_(18) O_(49)-5 sample was four times higher than that of W_(18) O_(49) under ultraviolet-visible(UV–vis) light *** photodegradation activity of N-CQDs@W_(18) O_(49)-5 sample was two times higher than that of W_(18) O_(49) under near-infrared(NIR) light *** enhanced photosensitivity of the nanocomposites was attributed to the promotion of charge separation by N-CQDs and the local surface plasmon resonance(LSPR) effect of W_(18) O_(49) under NIR light *** work provides a promising approach for designing and manufacturing photocatalysts with full-spectral responsiveness and improved charge separation.

关键词： Photocatalysis Full-spectrum light Tungsten oxide Localized surface plasmon resonance Nitrogen-doped carbon quantum dots

Testing mechanisms underlying elevational patterns of lakeshore plant community assembly in Poyang Lake, China

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Journal of Plant Ecology 2019年第3期12卷 438-447页

作者： Zhichun Lan Yasong Chen Lei li Feng li binsong Jin Jiakuan Chen Jiangxi Province Key Laboratory of Watershed Ecosystem Change and Biodiversity Center for Watershed EcologyInstitute of Life ScienceSchool of Life SciencesNanchang UniversityNanchang 330031China Coastal Ecosystems Research Station of the Yangtze River Estuary Ministry of Education Key Laboratory for Biodiversity Science and Ecological EngineeringSchool of Life SciencesFudan UniversityShanghai 200438China Key Laboratory of Watershed Ecology and Geographical Environment Monitoring NASGNanchang 330029China Key Laboratory of Poyang Lake Environment and Resource Utilization Ministry of EducationNanchang UniversityNanchang 330031China National Ecosystem Research Station of Jiangxi Poyang Lake Wetland Nanchang 330038China Key Laboratory of Agro-ecological Processes in Subtropical Region Institute of Subtropical AgricultureChinese Academy of SciencesChangsha 410125China

Aims Plant community assembly in wetlands usually changes with eleva-tion gradients,which may be due to the direct effect of flooding and indirect effects such as changes in soil properties and ***,the respective importance of each factor remains to be *** We investigated patterns of plant diversity,community biomass and soil properties along an elevation gradient of a lakeshore meadow at Poyang Lake,*** Findings(i)With increasing elevation,species richness and Simpson diver-sity index *** aboveground biomass(AGB)and below-ground biomass(BGB)increased with elevation,however,the BGB/AGB ratio also increased,which suggests a significant effect of belowground competition.(ii)Soil N content and soil N:P ratio increased,whereas soil pH decreased with *** soil properties showed no significant response.(iii)Structural equa-tion modeling showed that variation of plant diversity was mainly explained by ***,intensified belowground competition seems to be the primary mechanism causing lower plant diversity at higher elevations.(iv)These findings were further supported by the observed greater response ratio of N and P storage in plant commu-nities than the response ratio of soil N and P content to elevation,suggesting that soil nutrient limitation and belowground nutrient competition increased with *** study has important implications to wetland management and biodiversity conserva-tion under environmental change(*** in flooding regimes,eutrophication).

关键词： belowground competition aboveground competition flooding tolerance nutrient limitation biomass allocation

Photocatalytic degradating methyl orange in water phase by UV-irradiated CdS carried by carbon nanotubes

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Science China(Technological Sciences) 2007年第3期50卷 279-289页

作者： li ChenSha TANG YaPing KANG BoNan WANG binsong ZHOU Feng MA Qiang XIAO Ji WANG DaZhi liANG Ji Department of Mechanical Engineering Tsinghua UniversityBeijing 100084China New Material Division Institute of Nuclear Energy TechnologyTsinghua UniversityBeijing 100084China Department of Chemistry Tsinghua UniversityBeijing 100084China School of Chemistry and Materials Science Heilongjiang UniversityHarbin 150080China

A new candidate for photocatalytic degradating organic dyes,CdS carried by car-bon nanotubes(CdS/CNTs) ,is reported. The degradation ratio curves of methyl orange in water phase show that the capability for degradating organic molecules of CdS/CNTs is obviously higher than that of separated CdS. The degradation ca-pability enhances as the increase of the amount of net CdS catalyst,the ratio of carbon nanotubes to CdS,and the area of the template,and is influenced by the pH value and the temperature of aqueous solution. These results suggest that the photocatalyst of CdS/CNTs is very suitable for potential applications in organic waste removal from water.

关键词： carbon nanotube cadmium sulfide methyl orange photocatalysis

Impact of anthropogenic activities on changes of ichthyofauna in the middle and lower Xiang River

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Aquaculture and Fisheries 2022年第6期7卷 693-702页

作者： Cong Zeng Yao Wen Xinhua liu Jianbo Yu binsong Jin Deliang li College of Animal Science and Technology Hunan Agricultural UniversityChangsha410128China School of Oceanography Shanghai Jiao Tong UniversityShanghai200030China National Ecosystem Research Station of Jiangxi Poyang Lake Wetland Institute of Life ScienceNanchang UniversityNanchang330031China

With the population increasing,fish communities,as important components in the river system,were inescapably impacted by human *** investigate these impacts,we characterized the fish community’s composition by environmental DNA metabarcoding in the urban and suburban sites along Xiang River in central *** results showed that 32 species were identified,and most species were from *** analysis indicated no significant differences in fish communities among the three urban ***,significant differences were observed between the bank solidified and non-solidified areas,which indicated that the channelization significantly influenced the biodiversity and *** alien species,Clarias gariepinus,was discovered in all examined sites,and it was negatively associated with ten native ***,human populations and acidification were also negatively related to *** findings clearly showed that the consequences of anthropogenic activities shaped ichthyofauna and caused biodiversity loss in the urban river.

关键词： Environmental DNA Human disturbances Fish communities Xiang river Biodiversity Conservation