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A Luminescent Cd(Ⅱ) Coordination Polymer Constructed from Isophthalic Acid and 1,3-Bis-(4-pyridyl)propane

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Chinese Journal of Structural Chemistry 2015年第6期34卷 925-930页

作者： XU Bo li Zhi-Wang JIANG Yang li cun-Cheng Key Laboratory of Chemical Sensing & Analysis in Universities of Shandong (University of Jinan) School of Chemistry and Chemical Engineering University of Jinan

A new coordination complex [Cd2（ip）2（bpp）]n （1, H2ip = isophthalic acid, bpp = 1,3-bis-（4-pyridyl） propane） has been synthesized and structurally characterized. Crystal data for the title complex are as follows： triclinic system, space group Pi with a = 9.6724（6）, b = 10.2243（6）, c = 14.8205（9） A, a = 88.927（5）, β = 71.664（6）, ）, = 75.767（5）°, F= 1345.79（14） A3, Mr = 751.29, Z= 2, F（000） = 740, Dc = 1.854 g/cm^3,μ（MoKa） = 1.636 mm^-1, R = 0.0259 and wR = 0.0623 for 4754 observed reflections with I 〉 20（0. X-ray structure analysis reveals that complex 1 holds a 3D architecture based on a-Po primitive cubic units with the [Cd4（COO）8] units treated as 6-connected nodes. Solid-state properties for 1, such as infrared spectroscopy, elemental analyses, thermal stability and luminescent property, have also been investigated.

关键词： coordination polymer crystal structure luminescence mixed-ligand approach

Removal of iodide anions in water by silver nanoparticles supported on polystyrene anion exchanger

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Journal of Environmental Sciences 2023年第6期128卷 45-54页

作者： li li Su-Juan Yu Rong-Gang Zheng Peng li Qing-cun li Jing-Fu liu State Key Laboratory of Environmental Chemistry and Ecotoxicology Research Center for Eco-Environmental SciencesChinese Academy of SciencesBeijing 100085China Hubei Key Laboratory of Environmental and Health Effects of Persistent Toxic Substances Institute of Environment and HealthJianghan UniversityWuhan 430056China University of Chinese Academy of Sciences Beijing 100049China Department of Ecology and Resources Engineering He Tao CollegeInner Mongolia 015000China

The removal of iodide(I^(−))from source waters is an effective strategy to minimize the formation of iodinated disinfection by-products(DBPs),which are more toxic than their brominated and chlorinated *** this work,a nanocomposite Ag-D201 was synthesized by multiple in situ reduction of Ag-complex in D201 polymer matrix,to achieve highly efficient removal of iodide from *** electron microscope/energy dispersive spectrometer characterization showed that uniform cubic silver nanoparticles(AgNPs)evenly dispersed in the D201 *** equilibrium isotherms data for iodide adsorption onto Ag-D201 was well fitted with Langmuir isotherm with the adsorption capacity of 533 mg/g at neutral *** adsorption capacity of Ag-D201 increased with the decrease of pH in acidic aqueous solution,and reached themaximum value of 802 mg/g at pH *** was attributed to the oxidization of I^(−),by dissolved oxygen under the catalysis of AgNPs,to I2 which was finally adsorbed as ***,the aqueous solutions at pH 7–11 could hardly affect the iodide *** adsorption of I^(−)was barely affected by real water matrixes such as competitive anions(SO_(4)^(2−),NO_(3)^(−),HCO3−,Cl^(−))and natural organic matter,of which interference of NOM was offset by the presence of Ca^(2+).The proposed synergistic mechanism for the excellent performance of iodide adsorption by the absorbent was ascribed to the Donnan membrane effect caused by the D201 resin,the chemisorption of I^(−)by AgNPs,and the catalytic effect of AgNPs.

关键词： Ag-D201 Iodide removal Donnan membrane effect Chemisorption Catalytic effect High selectivity

Water infiltration and soil-water characteristics of compacted loess under applied vertical stress

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Journal of Mountain Science 2023年第3期20卷 873-885页

作者： ZHANG lin li Tong-lu li Ji-heng liANG Wei CHEN cun-li Department of Geological Engineering Chang'an UniversityXi'an 710054China Water Cycle and Geological Environment Observation and Research Station for the Chinese Loess Plateau Ministry of EducationZhengning 745339China School of Civil Engineering Chang'an UniversityXi'an 710061China Institute of Geotechnical Engineering Xian University of TechnologyXi'anShaanxi 710048China

Additional stress formed by postconstruction buildings in loess-filling areas affects water infiltration in soil and causes soil *** investigate this effect,under constant water head,vertical infiltration tests on compacted loess with two initial dry densities for different applied vertical stresses were developed using vertical stresscontrollable one-dimensional soil *** timehistory curves of vertical deformation,wetting front depth,cumulative infiltration depth,volumetric water content(VWC)and suction were measured,and the soil-water characteristic curves(SWCCs)were *** results showed that:(1)the infiltration ability of the soil column weakens with increasing applied vertical stress and initial dry density;(2)vertical deformation increases rapidly at first and then tends to be stable slowly at the consolidation and wetting-induced deformation stage,and is positively correlated with applied vertical stress and is negatively correlated with initial dry *** stability time of wetting-induced deformation and the corresponding wetting front depth increase with the increase of applied vertical stress,while they decrease obviously when initial dry density increases;(3)the influence of applied vertical stress on soilwater characteristics in soil columns with various initial dry densities is related to the deformation depth of soil *** VG(Van Genuchten)model is suitable for fitting the SWCCs at different monitoring positions.A normalized SWCC model introducing the applied vertical stress was proposed for each initial dry density using the mathematical relationship between the fitting parameters and the applied vertical stress.

关键词： Additional stress Loess Vertical deformation Wetting front Soil column Soil-water characteristic curves

Synergistic extraction of zinc from ammoniacal solutions using a β-diketone mixed with trialkylphosphine oxide

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Rare Metals 2019年第3期38卷 270-276页

作者： Ru-Long Zhu Xin-Bin li Chang Wei Hui Huang Min-Ting li cun-Xiong li Fu-li Tang Faculty of Metallurgy and Energy Engineering Kunming University of Science and Technology Yunnan Yuntong Zinc Co. Ltd

A simple comparative study of synergistic extraction of zinc from ammonium sulfate and ammonium chloride systems with mixtures of Mextral54-100 and tri-nalkylphosphine oxide(TRPO) dissolved in n-heptane was described. Various parameters affecting the extraction process were investigated. Experimental results show that extraction from ammonium sulfate is better than that from ammonium chloride under the same conditions owing to the additional complexation between zinc and chloride ions. Total ammonium concentration and pH have a significant effect on zinc extraction efficiency because of the formation of zinc ammine complexes. The synergistic effect is explained by the formation of adduct between zinc chelates and trialkylphosphine oxide. The thermodynamic data show that the extraction reaction is exothermic and stripping is endothermic. Infrared(IR) spectra of the zincloaded organic phases were also examined.

关键词： Synergistic extraction Zinc Ammonium sulfate Ammonium chloride Mextral54-100 Trialkylphosphine oxide

High-order numerical method for the derivative nonlinear Schrodinger equation

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International Journal of Modeling, Simulation, and Scientific Computing 2017年第1期8卷 258-270页

作者： Shu-cun li Xiang-Gui li Jun-Jie Cao Wen-Bo li School of Applied ScienceBeijing Information Science and Technology UniversityBeijing 100192P.R.China

In this work,a fourth-order numerical scheme in space and two second-order numerical schemes in both time and space are proposed for the derivative nonlinear Schrodinger *** verify the mass conservation for the two-level implicit *** influence on the soliton solution by adding a small random perturbation to the initial condition is *** numerical experiments are given to test the accuracy order for different schemes,*** also test the conservative property of mass and Hamiltonian for these schemes from the numerical point of view.

关键词： Derivative nonlinear Schrodinger equation finite difference soliton solution random perturbation

Synthesis and Crystal Structure of a New One-dimensional Zn(II) Nitronyl Nitroxide Complex Bridged by Pyridine-2,4-dicarboxylate Anion

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Chinese Journal of Structural Chemistry 2006年第6期25卷 735-739页

作者： GAO Dong-Zhao li li-cun liAO Dai-Zheng JIANG Zong-Hui YAN Shi-Ping Department of Chemistry Nankai University Tianjin 300071 China State Key Laboratory of Structural Chemistry Fujian Institute of Research on the Structure of Matter The Chinese Academy of Sciences Fuzhou 350002 China

A new one-dimensional （1-D） Zn（Ⅱ） nitronyl nitroxide complex bridged by pyridine-2,4-dicarboxylate anion, [Zn（NIT4Py）（2,4-PDA）（H2O）2], （NIT4Py = 2-（4′-pyridyl）-4,4,5,5- tetramethylimidazoline-1-oxyl-3-oxide and 2,4-PDA = pyridine-2,4-dicarboxylate anion）, has been synthesized and structurally characterized by X-ray diffraction. It crystallizes in monoclinic, space group P21/c with a = 16.834（2）, b = 7.4376（10）, c = 18.295（3） A, β = 102.848（2）°, V = 2233.2（5） A^3, C19H23N4O3Zn, Mr = 500.78, Dc = 1.489 g/cm^3,μ（MoKa） = 1.152 mm^-1, F（000） = 1036, Z = 4, the final R = 0.0390 and wR = 0.0915 for 3234 observed reflections. In the complex, each zinc（Ⅱ） ion is six-coordinated by one nitrogen atom of the radical ligand （NIT4Py）, one nitrogen atom and two oxygen atoms of two 2,4-PDA anions and two oxygen atoms of two water molecules. Each 2,4-PDA anion bridges two Zn（Ⅱ） ions via a tridentate mode into a 1-D chain, and these 1-D chains are further linked into a 2-D network via hydrogen-bonding interactions.

关键词： zinc(Ⅱ) complex nitronyl nitroxide radical crystal structure pyridine-2,4-dicarboxylic acid

The role of natural fracture activation in hydraulic fracturing for deep unconventional geo-energy reservoir stimulation

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Petroleum Science 2023年第4期20卷 2141-2164页

作者： Jun Wang He-Ping Xie Stephan KMatthai Jian-Jun Hu cun-Bao li Guangdong Provincial Key Laboratory of Deep Earth Sciences and Geothermal Energy Exploitation and Utilization Institute of Deep Earth Sciences and Green EnergyShenzhen UniversityShenzhen518060GuangdongPR China Shenzhen Key Laboratory of Deep Engineering Sciences and Green Energy College of Civil and Transportation EngineeringShenzhen UniversityShenzhen518060GuangdongPR China Department of Infrastructure Engineering University of MelbourneMelbourneVIC3010Australia MOE Laboratory of Deep Earth Science and Engineering Sichuan UniversityChengdu610065SichuanPR China

The presence of sealed or semi-sealed,multiscale natural fracture systems appears to be crucial for the successful stimulation of deep *** explore the reaction of such systems to reservoir stimulation,a new numerical simulation approach for hydraulic stimulation has been developed,trying to establish a realistic model of the physics *** new model successfully reproduces dynamic fracture activation,network generation,and overall reservoir permeability *** outputs indicate that natural fractures facilitate stimulation far beyond the near-wellbore area,and can significantly improve the hydraulic conductivity of unconventional geo-energy *** to our model,the fracture activation patterns are jointly determined by the occurrence of natural fractures and the in situ ***-density natural fractures,high-fluid pressure,and low effective stress environments promote the formation of complex fracture networks during *** or multicluster fracturing treatments with an appropriate spacing also increase the stimulated reservoir area(SRA).The simulation scheme demonstrated in this work offers the possibility to elucidate the complex multiphysical couplings seen in the field through detailed site-specific modeling.

关键词： Natural fractures DFM Unconventional geo-energy reservoir Fracture reactivation Hydraulic stimulation

Enhanced thermoelectric and mechanical properties of Bi_(0.5)Sb_(1.5)Te_(3) alloy with dispersed yttrium oxide ceramic nanoparticles

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Rare Metals 2024年第4期43卷 1758-1768页

作者： cun-Cheng li Ming-Wei Zhang Ji-Wu Xin Lei Wei Wen-Yu Zhao School of Materials Science and Engineering Shandong University of TechnologyZibo255000China School of Electrical and Electronic Engineering Nanyang Technological UniversitySingapore639798Singapore State Key Laboratory of Advanced Technology for Materials Synthesis and Processing Wuhan University of TechnologyWuhan430070China

Reducing thermal conductivity while avoiding adverse interfacial reactions during sintering is crucial for improving the thermoelectric performance of Bi_(2)Te_(3)based *** ceramic nanoparticles are good candidates for achieving this *** this study,we designed and prepared a series of p-type Bi_(0.5)Sb_(1.5)Te_(3)nanocomposites decorated with Y_(2)O_(3)ceramic nanoparticles via ball-milling dispersion and spark-plasma *** to the chemical stability of the ceramics,no traces of atomic doping or interfacial reactions were *** measurements revealed that the Y_(2)O_(3)nanoparticles distributed along the grain boundaries acted as energy-dependent carrier-filtering centers to improve the scattering parameter and Seebeck coefficient,contributing to the elevated power factor even with a decreased electrical ***,the incorporated Y_(2)O_(3)nanoparticles and various defect structures they induced effectively strengthened the phonon scattering and suppressed the lattice thermal ***,a peak figure of merit(ZT)of 1.23 at 313 K was achieved for 0.4%Y_(2)O_(3)/Bi_(0.5)Sb_(1.5)Te_(3),which is 13%higher than that of the *** addition,the Vickers hardness of the composite material was 35%higher than that of the *** study demonstrates the effectiveness of ceramic nanoparticles in synergistic ally improving the thermoelectric and mechanical properties,which may be further extended to other thermoelectric systems.

关键词： Bi_(0.5)Sb_(1.5)Te_3 alloy Y_(2)O_(3) ceramic nanoparticles Microstructures Thermoelectric performance Mechanical properties

Synthesis, Crystal Structure and Optical Properties of a New Nd(III) Nitronyl Nitroxide Complex [Nd(NIT2Py)_2(NO_3)_3]

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Chinese Journal of Structural Chemistry 2005年第8期24卷 905-908页

作者： li Dong-Jiao GAO Dong-Zhao li li-cun liAO Dai-Zheng JIANG Zong-Hui YAN Shi-Ping Department of Chemistry Nankai University ChinaTianjin 300071 State Key Laboratory of Structural Chemistry Fujian Institute of Research on the Structure of Matter The Chinese Academy of Sciences ChinaFuzhou Fujian 350002

A new Nd（Ⅲ） nitronyl nitroxide complex [Nd（NIT2Py）2（NO3）3] （NIT2Py = 2-（2＇-pyridyl）-4,4,5,5-tetramethylimidazoline-l-oxyl-3-oxide） has been synthesized and structurally characterized by X-ray diffraction. It crystallizes in monoclinic, space group P21/n with a = 12.396（4）, b =11.134（4）, c = 23.360（7） A°, β = 98.178（6）°, V= 3191.2（18） A°^3, C24H32N9NdO13, Mr = 798.83, Dc =1.663 g/cm^3, μ（MoKa） = 1.704 mm^-1, F（000） = 1612, Z = 4, the final R = 0.0425 and wR = 0.0957 for 6532 independentreflections with Rint = 0.0642 and 4552 observed reflections （I 〉 2σ（I））. The complex exists as discrete mononuclear molecules and the neodymium（Ⅲ） ion is ten-coordinated with three bidentate nitrate anions and two radical ligands （NIT2Py） via bidentate chelating *** optical properties of the complex are discussed.

关键词： neodymium(Ⅲ)complex nitronyl nitroxide radical crystal structure optical properties