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Preparation of Corn Stalk-Walnut Shell Mix-based Activated Carbon and Its Adsorption of Malachite Green

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Chemical Research in Chinese Universities 2018年第6期34卷 1014-1019页

作者： KANG Chunli SHANG Dan YANG Ting ZHU Ling LIU Fang WANG Nan TIAN Tao Key Laboratory of Groundwater Resources and Environment Ministry of Education Jilin University Changchun 130012 P. R. China

The mix-based activated carbon derived from corn stalk and walnut shell was prepared by chemical activation method using phosphoric acid as the activator. The optimized conditions for preparation were obtained by the orthogonal experiment, the characterizations of the activated carbon were performed by scanning electron microscopy （SEM）, Fourier transform infrared spectroscopy（FTIR）, Boelan＇s titration method and nitrogen adsorption. For the prepared mix-based activated carbon, the highest iodine number, methylene blue number and BET surface area axe 720.5 mg/g, 195.0 mg/g and 1187 m^2/g, respectively, and the pores are mainly mesopores. The mix-based activated carbon shows the higher adsorption capacity for malachite green than the raw materials, the activated carbons prepared only from corn stalk or walnut shell and the commercial activated carbon. The kinetics and thermodynamics of the adsorption can be satisfactorily described by the pseudo-second-order kinetic model and the Langmuir isotherm model, separately.

关键词： Mix-based activated carbon Phosphoric acid activation Adsorption Malachite green

Response of leaf photosynthetic characteristics of Syringa oblata and Syringa reticulata *** to chilling stress

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Journal of Forestry Research 2020年第2期31卷 521-530页

作者： Xiaojia Liu Baiyi An Na Gu Cainan Guo Xiaogang Sun He Wang College of Horticulture Jilin Agricultural UniversityChangchun 130118JilinPeople’s Republic of China College of Wildlife Resources Northeast Forestry UniversityHarbin 150040HeilongjiangPeople’s Republic of China

Syringa species not only have good ornamental properties but also play an important role in the landscaping and environmental purification of *** investigate the chilling stress resistance of Syringa oblata *** Syringa reticulata *** and provide theoretical grounds for the practical cultivation of Syringa species,in vitro leaves were used to study photosynthetic gas exchange parameters and chlorophyll fluorescence *** nine hours of chilling,decreasing rates of net photosynthesis,stomatal conductance,and transpiration in *** *** leaves were significantly greater than that of the ***,while intercellular CO2 concentrations in *** leaves were higher than those in *** *** quantum yield of PSII reaction center(APSII)declined in *** and light capture efficiency(Fv 0/Fm 0)was ***,reduction percentages of Fv 0/Fm 0,APSII,and Fv/Fm in *** were significant higher than those of *** *** nine hours of chilling,the relative variable fluorescence of VJ and VI of *** increased and the increasing rate of VJ was greater than *** contrast,the change of VJ and VI in *** *** leaves was relatively *** suggests that chilling primarily damaged the electron transport process of QA to QB at the receptor site of the PSII reaction *** capacity of *** was more sensitive to chilling stress compared to *** ***,which the limitations were mainly due to non-stomatal factors such as the decrease in electron transport efficiency,activity in the PSII reaction center,and the destruction of the photodamage defense system.

关键词： Chilling stress Chlorophyll fluorescence characteristics Photosynthetic capacity Syringa oblate Syringa reticulata var.mandshurica

Adsorption of Basic Dyes Using Walnut Shell-based Biochar Produced by Hydrothermal Carbonization

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Chemical Research in Chinese Universities 2018年第4期34卷 622-627页

作者： KANG Chunli ZHU Ling WANG Yixue WANG Yuhan XIAO Kunkun TIAN Tao Key Laboratory of Groundwater Resources and Environment(jilin University) Ministry of Education Jilin University Changchun 130012 P. R. China

Hydrothermal carbon（HC） was prepared from walnut shells, which are abundant in Northeastern china. The prepared HC was used as a precursor to produce mtric acid modified carbon（MC）. The hydrothermal carbonization included dehydration and decarboxylation processes wherein the hemicellulose was completely decomposed and the celhilose was partly decomposed, with some oxygen-containing functional groups being produced. The aromati- city, specific surface area and pore content of the HC increased, but its polarity decreased. With 6 mol/L nitric acid and a modification time of 15 min, the specific surface area and pore content decreased, but the proportion of oxy- gen-containing fimctional groups on the surface increased significantly, thereby improving the dye adsorption performance. The adsorption of methylene blue and malachite green was best desclibed by the pseudo-second-order kinetic and Langmuir isotherm models. The adsorption capacity of MC was determined to be much larger than that of HC.

关键词： Biochar Adsorption Walnut shell Hydrothemal carbonization Basic dye

Highly efficient catalyst for 1,1,2-trichloroethane dehydrochlorination via BN_(3) frustrated Lewis acid-base pairs

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Nano Research 2024年第6期17卷 4773-4781页

作者： Yuxue Yue Fangmin Zuo Bolin Wang Xiaoling Xian Jun Tang Haifeng Zhang Zilong Zhang Qingping Ke Wei Chen School of Chemical Engineering Northeast Electric Power UniversityJilin 132012China Industrial Catalysis Institute of Zhejiang University of Technology Hangzhou 310014China Key Laboratory of Carbon Materials of Zhejiang province College of Chemistry and Materials EngineeringWenzhou UniversityWenzhou 325035China College of Chemistry and Chemical Engineering Anhui University of TechnologyMaanshan 243002China

In this study,a novel non-metallic carbon-based catalyst co-doped with boron and nitrogen(B,N)was successfully *** precisely controlling the carbonization temperature of a binary mixed ionic liquid,we selectively modified the doping site structure,ultimately constructing a B,N co-doped frustrated Lewis acid-base pair *** catalyst exhibited remarkable catalytic activity,selectivity,and stability in the dehydrochlorination reaction of 1,1,2-trichloroethane(TCE).Detailed characterization and theoretical calculations revealed that the primary active center of this catalyst was the BN_(3)*** to conventional graphitic N structures,the BN_(3)structure had a higher p-band center,ensuring superior adsorption and activation capabilities for TCE during the *** the BN_(3)site,three negatively charged nitrogen atoms acted as Lewis bases,while positively charged boron atoms acted as Lewis *** synergistic interaction facilitated the specific dissociation of chlorine and hydrogen atoms from TCE,significantly enhancing the 1,1-dichloroethene *** this research,we not only explored the active site structure and catalytic mechanism of B,N co-doped catalysts in depth but also provided an efficient,selective,and stable catalyst for the dehydrochlorination of TCE,contributing significantly to the development of non-metallic catalysts.

关键词： B N co-doped sites dehydrochlorination frustrated Lewis acid-base pairs catalytic mechanism

Synthesis,Characterization and Phase Transformation of 3D Open-framework Zinc Phosphate [Zn_6(H_2O)P_5O_(20)][C_5N_2H_(14)][C_6H_(16)N_2]_(0.5)·3H_2O

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Chemical Research in Chinese Universities 2009年第4期25卷 407-411页

作者： SONG Yu DONG Zhao-jun WANG Yong-wei FU Jun LI Ji-yang State Key Laboratory of Inorganic Synthesis and Preparative Chemistry Jilin University Changchun 130012 P. R. China School of Chemistry Engineering ＆ Material Dalian Institute of Light Industry Dalian 116034 P. R. China Geriatric Ward First Hospital of Jilin University Changchun 130021 P R. China

With N,N′-dimethylpiperazine（DMPIP） as the structure-directing agent, a zinc phosphate [Zn6（H2O）P5O20] [C5N2H14] [C6H16N2]0.5·3H2O（1） with a novel three-dimensional（3D） open-framework architecture was hydrothermally synthesized. Its structure was determined by single-crystal X-ray diffraction analysis and further characterized by ICP, NMR, and TG analyses. Compound 1 crystallized in the triclinic space group P1（No.2） with a=0.9984（2） nm, b=1.2354（3） nm, c=1.2384（3） nm, α=88.32（3）°, β=74.57（3）°, γ=75.81（3）° and Z=2. The alternation arrrangement of tetrahedral Zn units[ZnO4 and ZnO3（H2O）] and PO4 units forms an anionic 3D open framework containing intersecting 16-, 10- and 8-ring channels. Water molecules, diprotonated DMPIP, and diprotonated N-methyl-piperazine（MPIP） decomposed from DMPIP, are located in the channels and interact with the host framework via H-bonds. Compound 1 transforms to another new phase（compound 2） upon calcination at 200―350℃ with the removal of the water coordinated to Zn atoms in the lattice. The phase transformation of compound 2 was further studied.

关键词： Hydrothermal Zinc phosphate Phase transformation

Chaotic behaviours and control of chaos in the p-Ge photoconductor

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Chinese Physics B 2010年第6期19卷 148-153页

作者：冯玉玲张喜和姚治海 Department of Physics Changchun University of Science and Technology

The chaotic behaviours in the p-Ge photoconductor system are studied by changing the photo-excitation coefficient and the routes and parameter conditions are given for chaos generation in this system. A scheme for controlling chaos in the p-Ge photoconductor is presented by adding an ac bias current. Numerical simulations show that this scheme can be effectively used to control chaotic states into stable period states for this system. Moreover, the different period states with diifferent period numbers can be obtained by appropriately adjusting the amplitude, frequency, and initial phase of the additional ac current.

关键词： chaotic behaviours chaos control p-Ge photoconductor

Cyclic stress induced phase transformation in super-bainitic microstructure

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Chinese Physics B 2017年第3期26卷 545-549页

作者：修文翠韩英刘澄吴化刘云旭 Key Laboratory of Advanced Structural Materials Ministry of Education Changchun University of Technology School of Mechanical Engineering Jilin Agricultural Science and Technology University College of Mechanical Engineering Yangzhou University

The effects of cyclic stress loading on the microstructual evolution and tensile properties of a medium-carbon super- bainitic steel were investigated. Experimental results show that the cyclic stress can induce the carbon gathering in austenite and phase transformation from film-like retained austenite to twin martensite, which will obviously enhance the tensile strength and the product of tensile strength and ductility. The higher the bainitic transformation temperature, the lower the transformation rate of the retained austenite. The amount and thickness of the film-like retained austenite play an important role during the cyclic stress induced phase transformation.

关键词： super-bainite cyclic stress retained austenite phase transformation

Faster vortex core switching with lower current density using three-nanocontact spin-polarized currents in a confined structure

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Chinese Physics B 2017年第1期26卷 449-453页

作者： Hua-Nan Li Zhong Hua Dong-Fei Li College of Physics Jilin Normal University Siping 136000 China

We perform micromagnetic simulations on the switching of magnetic vortex core by using spin-polarized currents through a three-nanocontact geometry. Our simulation results show that the current combination with an appropriate current flow direction destroys the symmetry of the total effective energy of the system so that the vortex core can be easier to excite,resulting in less critical current density and a faster switching process. Besides its fundamental significance, our findings provide an additional route to incorporating magnetic vortex phenomena into data storage devices.

关键词： magnetic vortex core polarity switching spin-polarized current micromagnetic simulations

Multi-functional vanadium dioxide integrated metamaterial for terahertz wave manipulation

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Chinese Physics B 2020年第9期29卷 331-336页

作者： Jian-Xing Zhao Jian-Lin Song Yao Zhou Rui-Long Zhao Yi-Chao Liu Jian-Hong Zhou School of Photoelectric Engineering Changchun University of Science and TechnologyChangchun 130022China Key Laboratory of Optoelectric Measurement and Optical Information Transmission Technology of Ministry of Education Changchun University of Science and TechnologyChangchun 130022China

We proposed a vanadium dioxide(VO2)-integrated multi-functional metamaterial structure that consists of three metallic grating layers and two VO2 films separated by SiO2 dielectric *** proposed structure can be flexibly switched among three states by adjusting temperature,incident direction,and *** state 1,the incident wave is strongly transmitted and perfectly converted to its orthogonal polarization *** state 2,the incident wave is perfectly *** state 3,incident wave is totally reflected *** working frequency of the multi-functional metamaterial can be arbitrarily tuned within a broad pass *** believe that our findings are beneficial in designing temperature-controlled metadevices.

关键词： metamaterial vanadium dioxide multi-functionality