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Synergetic and Antagonistic Effects of Cadmium on Adsorption of Atrazine on Surficial Sediments

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Chemical Research in Chinese Universities 2009年第2期25卷 155-160页

作者： LI Yu Gao Qian WANG Xiao-li dong De-ming WANG ao Energy and Environmental Research Centre North China Electric Power University Beijing 102206 P. R. China College of Environment and Resources Jilin University Changchun 130012 P. R. China

Co-contamination of atrazine（AT） and cadmium（Cd） on the surficial sediments（SSs） and natural suface coating samples（NSCSs） was investigated via thermodynamic adsorption experiments. The results show that surface coatings have a stronger ability to adsorb AT owing to their higher active components compared with surficial sediments. Synergetic and antagonistic effects of Cd on the adsorption of AT were observed. Cd at a lower concentration（≤4.0 mg/L） in the solid/liquid phase enhanced AT adsorption onto the surficial sediments（surface coatings）, while the adsorption of AT would be inhibited at a Cd concentration of more than 8.0 mg/L： AT coordinates strongly to Cd, and AT-Cd complexes seem to be more strongly adsorbed on sediments than AT alone, and at the adsorption of AT can take place on the sites where Cd has been previously adsorbed and Cd acts as a bridge for the interaction be- tween sediments and AT. With the increase of Cd concentration, the superfluous Cd may hold much more adsorption sites and thus inhibits the adsorption of AT. Meanwhile, the effects of co-existed AT on Cd adsorption on SSs（NSCSs） were insignificant since Cd has a stronger competitive ability to be absorbed on SSs（NSCSs）. The present study could be useful in predicting interactions of the metal ions with herbicides and potentially aid the design of remediation strategies for contaminated sediments and groundwater.

关键词： Atrazine Cadmium Surficial sediment Surface coating Co-contamination

Controlling Ion Conductance and Channels to Achieve Synapticlike Frequency Selectivity

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Nano-Micro Letters 2015年第2期7卷 121-126页

作者： Siheng Lu Fei Zeng Wenshuai dong ao Liu Xiaojun Li Jingting Luo Laboratory of Advanced Materials (MOE) School of Materials Science and Engineering Tsinghua University Institute of Thin Film Physics and Applications Shenzhen Key Laboratory of Sensor Technology Shenzhen University

Enhancing ion conductance and controlling transport pathway in organic electrolyte could be used to modulate ionic kinetics to handle signals. In a Pt/Poly(3-hexylthiophene-2,5-diyl)/Polyethylene?Li CF3SO3/Pt hetero-junction, the electrolyte layer handled at high temperature showed nano-fiber microstructures accompanied with greatly improved salt solubility. Ions with high mobility were confined in the nano-fibrous channels leading to the semiconducting polymer layer,which is favorable for modulating dynamic doping at the semiconducting polymer/electrolyte interface by pulse *** a device realized synaptic-like frequency selectivity, i.e., depression at low frequency stimulation but potentiation at high-frequency stimulation.

关键词： Ions migration Nano-channels Frequency selectivity Semiconducting polymer Organic electrolyte Dynamic doping

Realizing high thermoelectric performance flexible free-standing PEDOT:PSS/Bi_(0.5)Sb_(1.5)Te_(3)composite films for power generation

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Rare Metals 2024年第11期43卷 5985-5993页

作者： Li Sun dong-Wei ao Junphil Hwang Qin Liu En-Si Cao Bing Sun School of Physics and Electronic Information Weifang UniversityWeifang 261061China School of Machinery and Automation Weifang UniversityWeifang 261061China School of Chemical Engineering and Technology Tianjin UniversityTianjin 300072China Korea Construction Equipment Technology Institute Gunsan-si 54004Jeollabuk-doKorea

Flexible thermoelectrics provide a distinct solution for developing sustainable and portable power ***/organic material compositing is an effective strategy to induce a significant enhancement of thermoelectric(TE)***,the poor electrical performance of inorganic/organic material is attributed to the poor carrier transport between organic/inorganic interfaces induced by the low contribution of composited inorganic ***,we prepared a high room temperature figure-of-merit(ZT)value of~0.19 and high bending resistance(surviving 1200 bending cycles at the bending radius of 16.5 mm)of p-type poly(3,4-ethylenedioxy thiophene):poly(4-styrenesulfonate)(PEDOT:PSS)/Bi_(0.5)Sb_(1.5)Te_(3)free-standing composite film via a facile vacuum-as sis ted filtration *** Bi_(0.5)Sb_(1.5)Te_(3)nano-spherical particles into PEDOT:PSS results in the optimized interfacial contact and carrier concentration,leading to a high Seebeck coefficient of~43.79μV·K^(-1).Accordingly,a high-power factor of~1.52μW·cm^(-1)·K^(-2)is achieved in the PEDOT:PSS/Bi_(0.5)Sb_(1.5)Te_(3)composite film at room *** addition,the PEDOT:PSS/Bi_(0.5)Sb_(1.5)Te_(3)interfaces with phase boundaries,nanograins and point defects could further decrease the thermal conductivity to~0.20 W·m^(-1)K^(-1),leading to a high ZT ***,a 6-leg freestanding film device was assembled,which provided an output power of 44.94 *** study demonstrates that free-standing organic/inorganic composite films are effective power sources for wearable electronic products.

关键词： Thermoelectric PEDOT:PSS/Bi_(0.5)Sb_(1.5)Te_(3) Flexible films Device

Ferroelectric polarization effect on the photocatalytic activity of Bi_(0.9)Ca_(0.1)FeO_(3)/CdS S-scheme nanocomposites

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Journal of Environmental Sciences 2023年第2期124卷 310-318页

作者： Yaowen Zhang ZifeiWang Jiangwei Zhu Xuemin He Hongtao Xue Sanlong Li Weiwei mao Yong Pu Xing’ao Li New Energy Technology Engineering Laboratory of Jiangsu Province&School of Science Nanjing University of Posts and TelecommunicationsNanjing 210023China Co-Innovation Center for Sustainable Forestry in Southern China Nanjing Forestry UniversityNanjing 210037China School of Telecommunications and Information Engineering Nanjing University of Posts and TelecommunicationsNanjing 210023China National Laboratory of Solid State Microstructures Nanjing UniversityNanjing 210093China

BiFeO_(3)(BFO),as a kind of narrow band-gap semiconductor material,has gradually emerged advantages in the application of *** this paper,Ca doped BFO nanoparticles Bi_(0.9)Ca_(0.1)FeO_(3)(BCFO)were prepared by sol-gel *** BCFO and CdS nanocomposites with two morphologies were obtained by controlling the time of loading CdS under a low temperature liquid phase *** is found that the band gap becomes narrower after doping Ca into BFO,which is conducive to the absorption of visible *** all the samples,the composite of CdS nanowires and BCFO nanoparticles obtained by reaction time of 10 min has the best photocatalytic *** degradation rate of Methyl Orange solutionwas 94%after 90min under visible light irradiation,whichwasmuch higher than that of pure BCFO and ***,significant enhancement in the degradation rate(100%degradation in 60 min)can be achieved in poled samples after electric polarization *** highest degradation rate is due to the promoted separation of photogenerated carriers induced by the internal polarization field and the formation of S-scheme heterostructure between BCFO and *** BCFO-CdS nanocomposites may bring new insights into designing highly efficient photocatalyst.

关键词： BiFeO_(3) Nanocomposites S-scheme heterojunction Photocatalytic activity

In-situ scalable fast fabrication of Cu-Cu_(2+1)O nanorods for highly efficient electrocatalytic reduction into ammonia under neutral medium

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Journal of Materials Science & Technology 2023年第24期155卷 111-118页

作者： Sai Huang ao Wang Xin-Yue dong Jin-Kun Li Yan Meng Jun-Ling Song International Joint Research Center for Photoresponsive Molecules and Materials School of Chemical and Material EngineeringJiangnan UniversityWuxi 214122China

The development of a highly efficient and durable electrocatalyst for nitrate reduction reaction(NO_(3)RR)wastewater valorization to ammonia(NH_(3))is a promising ***,it is challenging to design scalable low-cost electrocatalysts with high activity,high selectivity,and long-term stability by a facile and simple ***,we construct this scalable Cu-based nanoarray with muti-oxidation states grown directly on nickel foam(NF)substrate(Cu_(2+1)O@Cu/NF)using a facile molten salt method combined in-situ electrochemical *** as-prepared Cu_(2+1)O@Cu/NF nanoarrays reveal a high NH_(3) yield of 20.14 mg h^(−1) cm^(−2) at−0.95 V vs.a reversible hydrogen electrode(***),Faradaic efficiency of 99.38%at−0.55 V *** in the neutral potassium phosphate(PBS)buffer solution with 50 mM NaNO_(3),which is ascribed to its electron redistribution with abundant oxygen vacancies and favorable charge/mass transfer.

关键词： Cu-Cu2+1O nanorods with multi-oxidation states High NH3 yield Molten salt method Neutral medium Nitrate electrochemical reduction Scalable fabrication

Effect of Annealing Temperature on Recrystallization Behavior of Cold Rolled Ti-Microalloyed Steel

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Journal of Iron and Steel Research International 2013年第9期20卷 105-110页

作者： HUO Xiang-dong mao Xin-ping L Sheng-xia School of Material Science and Engineering Jiangsu University Guangzhou Zhujiang Steel Co. Ltd.

In order to develop cold rolled Ti-microalloyed steel strips, the effects of annealing temperature on recrys-tallization behavior of experimental steel were researched by optical microscopy （OM）, transmission electron micros-copy （TEM） and Vickers hardness test. The annealing treatment could be divided into three distinct stages： recovery, recrystallization and grain growth. Reerystallization took place from 933 to 1033 K, during which a large number of recrystallized grains appear and hardness drops sharply. The morphology and size of TiN particles nearly remained unchanged at different stages of processing. With increasing annealing temperature, nanometer precipitates coarsened and the dislocation density was significantly reduced. In comparison with annealing time, annealing temperature was more crucial for recrystallization of cold rolled Ti microalloyed steel. It could be concluded that the pinning force of nanometer particles on dislocations increased the recrystallization temperature. At higher annealing temperature, re crystallization took place because of precipitates coarsening caused by Ostwald ripening.

关键词： annealing temperature recrystallization Ti-microalloyed steel titanium earbide dislocation

Hydrogen Absorption and Desorption during Heat Treatment of AISI 4140 Steel

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Journal of Iron and Steel Research International 2014年第10期21卷 951-955页

作者： Ming-da ZHANG mao-qiu WANG Han dong National Engineering Research Center of Advanced Steel Technology Central Iron and Steel Research Institute School of Materials Science and Engineering Tsinghua University

Hydrogen plays an important role in the formation of quench cracks of structural steels. To clarify hydrogen ab- sorption and desorption during heat treatment of AISI 4140 steel, thermal desorption spectrometry （TDS） analysis was carried out for the specimens in the as-rolled, as quenched, and quenched and tempered conditions. Results show that hydrogen content increased from 0. 127 ×10 6 in the as-rolled specimen to 0. 316 × 10-6 in the as-oil-quenched specimen. After tempering at 200 ℃, the hydrogen content in the oil-quenched specimen decreased to 0. 155 × 10-6 , and the peak temperature of hydrogen desorption increased from 200 to 360 ℃. From the dependence of hydrogen content in the as-quenched specimens on austenitizing time, it can be deduced that hydrogen absorption occurs during austenitizing. The simulation of hydrogen absorption contributes to a better understanding on the distribution of hy- drogen during the heat treatment in structural steels.

关键词： steel hydrogen absorption heat treatment thermal desorption spectrometry

Synthesis and mesomorphic properties of bent-shaped molecule with low bent-angle central core and long alkylthio tail

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Chinese Chemical Letters 2011年第9期22卷 1111-1114页

作者： Xiao dong Li mao Sheng Zhan Kai Wang School of Material Science and Engineering Beijing University of Aeronautics and Astronautics Beijing 100191 China

Two homologous series of bent-shaped molecules composed of low bent-angle naphthalene central core and long alkoxy tail or alkylthio tail, N（1,7）-n-OPIMB and N（1,7）-n-SP1MB （n = 20, 22）, respectively, were synthesized. The mesomorphic properties were investigated by differential scanning calorimetry （DSC）, polarizing optical microscopy （POM） and X-ray diffraction （XRD）. Compared to the direct transition from the isotropic phase to the chiral B4 phase examined in N（1,7）-n-OPIMB, N（1,7）-n-SPIMB exhibited a rare Iso-Ncol-Colh-B4 phase sequence. The combination of the asymmetric low bent-angle 1,7-naphathalene central core and the flexible long alkylthio tail is considered to play an important role in the formation of such a novel phase sequence.

关键词： Bent-shaped Liquid crystal Alkylthio tail Mesomorphic behaviour

Low Root Zone Temperature Limits Nutrient Effects on Cucumber Seedling Growth and Induces Adversity Physiological Response

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Journal of Integrative Agriculture 2013年第8期12卷 1450-1460页

作者： YAN Qiu-yan DUAN Zeng-qiang mao Jing-dong LI Xun dong Fei State Key Laboratory of Soil and Sustainable Agriculture Institute of Soil ScienceChinese Academy of Sciences Department of Chemistry and Biochemistry Old Dominion University Agricultural Bureau of Xiangfen County Shanxi Province

Effects of root-zone temperatures （RZT）（12℃-RZT and 20℃-RZT） and different N, P, and K nutrient regimes on the growth, reactive oxygen species （ROS）, and antioxidant enzyme in cucumber seedlings were investigated in hydroponics. Strong interactions were observed between RZT and nutrient on the dry weight （P=0.001）, root length （P=0.001） and leaf area （P=0.05）. Plant dry weights were suppressed at low RZT of 12℃, while higher biomass and growth of cucumber seedlings were produced at elevated RZT of 20℃ under each nutrient treatment. Growth indexes （plant height, internode length, root length, and leaf area） at 12℃-RZT had less difference among nutrient treatments, but greater response was obtained for different nutrients at high RZT. RZT had larger effects （P=0.001） on cucumber seedling growth than nutrients. In addition, N was more effective nutrients to plant growth than P and K under low root temperature to plant growth. Higher hydrogen peroxide （H202）, malondialdehyde （MDA）, soluble sugar （SS） contents in leaves were observed at 12℃-RZT in all nutrient treatments than those at 20℃-RZT, indicating the chilling adversity damaged to plant growth. In general, antioxidant enzyme had larger response under low root-zone temperature. Superoxide dismutase （SOD） activities were higher in both leaves and roots while peroxidase （POD） and catalase （CAT） showed large different action in leaves and roots at both the two root-zone temperature.

关键词： Cucumis sativus L. growth indexes antioxidant enzyme reactive oxygen