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For Selected: Download Citations EndNote Ris BibTeX Toggle Thumbnails Select Preparation of Amino-Salicylic Acid Modified Tannin-Based Resin and Its Adsorption Performance of Ag(I)  LI Jialing, HUANG Qianlan, ZHANG Aihua, PENG Zhiyuan Journal of Jishou University(Natural Sciences Edition)    2024, 45 (1): 42-47.   Abstract （59）      PDF（pc） （843KB）（133）       Knowledge map    Save The chlorinated tannins were prepared by chlorination of Bayberry Tannin  with dichlorosulfoxide,then cross-linked with amino-salicylic acid to synthesize salicylic modified tannins,and then cross-linked with paraformaldehyde to obtain salicylic acid tannin-based resin.FTIR characterized the structure of the tannin-based resin.The effects of solution pH,initial concentration of Ag(I),temperature,and time on the adsorption performance were investigated.The experiments showed that the maximum adsorption of Ag(I) by the resin could reach 239.6 mg/g at the temperature of 318 K,pH of 5.0,and the initial concentration of Ag(I) of 260 mg/L.The adsorption thermodynamics indicated that this material's adsorption process of Ag(I) was in accordance with the Langmuir adsorption isotherm model and the quasi secondary kinetic model.It can be concluded that the amino-salicylic acid modified tannin-based resin has good Ag(I) adsorption performance. Reference | Related Articles | Metrics | Comments（0） Select Selective Retention and Controlled Release Behavior of a Temperature-Sensitive Imprinted Polymer Monolith for Diosgenin LIU Meijun, PENG Yuting, XIAO Zhenyi, ZHOU Xiaohui, JIAN Yuxuan, MAO Lin, LI Hui Journal of Jishou University(Natural Sciences Edition)    2024, 45 (1): 48-55.   DOI: 10.13438/j.cnki.jdzk.2024.01.009 Abstract （76）      PDF（pc） （754KB）（130）       Knowledge map    Save A temperature-sensitive imprinted polymer was prepared with diosgenin as the template and with α-methacrylic acid (MAA) and N-Isopropylacrylamide (NIPAM) as mixed-functional monomer in present work.Then,this imprint polymer was filled into an empty stainless steel tube to produce a molecularly imprinted polymer column and the retention and controlled release behavior for this column toward the template as a drug molecule were evaluated in chromatographic model.The influence of column temperature,effluent composition and pH,and effluent ion strength on the retention selectivity and controlled release behavior for this imprint column was investigated.Results indicated that column temperature possessed significant influence on retention and controlled-release behavior for the imprint column.When it was set at 303 K (near critical temperature of this imprinted polymer),the column had the strongest retention capacity toward the template.Moreover,when column temperature was higher and/or lower than 303 K,a decreased retention capacity and an accelerated template release for the imprint column was observed.In addition,effluent composition,pH and effluent ion strength also affect the retention and controlled-release for this imprint column.At 303 K column temperature and with effluent of  0.001 mol/L (pH 7.4),the release time was as long as 1 050 min. Reference | Related Articles | Metrics | Comments（0） Select Determination of Organic Germanium and Total Germanium Through Automatic Digestion and Fluorescence Spectrometry LIU Bangfu Journal of Jishou University(Natural Sciences Edition)    2024, 45 (1): 56-60.   DOI: 10.13438/j.cnki.jdzk.2024.01.010 Abstract （76）      PDF（pc） （450KB）（118）       Knowledge map    Save With organic germanium and total germanium as indexes in herbal medicine,and with the property of GeCl4 low boiling point,the organic germanium and inorganic germanium are separated and extracted by fully automated sample digestion system,and determined by atomic fluorescence spectrometry.We found that inorganic germanium could be extracted at 50 ℃,vibrating for 40 min in mass fraction of 1% HNO3.In 6 mol/L HCl heated at 100 ℃ for 60 min,the inorganic germanium and organic germanium can be separated.The LOD of Ge was 0.16 μg/L,the recoveries of germanium was 92.5%～104.0%,and the RSD was 2.01%～3.77%,which accords with the demand of analysis. Reference | Related Articles | Metrics | Comments（0） Select Determination of Seven Volatile Components in Xiangxi Aromatic Vinegar by GC-MS RAO Qingqing Journal of Jishou University(Natural Sciences Edition)    2024, 45 (1): 61-65.   DOI: 10.13438/j.cnki.jdzk.2024.01.011 Abstract （77）      PDF（pc） （464KB）（124）       Knowledge map    Save The Xiangxi aromatic vinegar were pretreatmented by SDE,and the content of  ethyl acetate,ethanol,ethyl lactate,2,3-butanedione,3-hydroxyl-2-butanone,furfural and 2,3-butanediol was determinated by GC-MS.HP-INNOWAX capillary gas chromatographic column and GC-MS-HS were used.The sample inlet temperature was 220 ℃,the split ratio was 40∶1,the fourth stage rod temperature was 230 ℃,the ion source temperature was 230 ℃,and SIM mode was used.The results showed that linear relationship was between 0.991 and 0.999,and the method repeatability  was less than 10%,which indicates that this method can be used for the determination of volatile components in Xiangxi aromatic vinegar. Reference | Related Articles | Metrics | Comments（0） Select Synthesis,Crystal Structure of the Novel Rhodium（Ⅱ） Complex LIU Xue, TIAN Yiran, FENG Yangyang, XU Mingming, CHEN Honglai, HOU Wenming, ZHANG Zhenqiang, LIU Weiping Journal of Jishou University(Natural Sciences Edition)    2023, 44 (4): 55-68.   DOI: 10.13438/j.cnki.jdzk.2023.04.007 Abstract （279）      PDF（pc） （10002KB）（185）       Knowledge map    Save Using rhodium（Ⅱ） acetate and trimethylrhodium acetate（Ⅱ） as the raw material,with 3,6-dibromo-9-(4-pyridinemethyl)-9H-carbazole (DBPMC1) and 3,6-dibromo-9-(3-pyridinemethyl)-9H-carbazole (DBPMC) as axial ligands,four rhodium（Ⅱ） carboxylates axial dibromo-9-pyridylmethyl-9H-carbazole complexes Rh(OOCR)4(DBPMC) were designed and synthesized.The single crystals of compounds were successfully cultured and their chemical structures were initially characterized by modern analytical methods such as H NMR,13C NMR and FT-IR.The results show that none of these four compounds has been reported in the literature,and they belong to a new type of rhodium carboxylate （Ⅱ） axial complex.The structure of the complex was determined by X-ray single crystal diffraction analysis to be composed of one molecule of rhodium（Ⅱ） carboxylate and two molecules of DBPMC ligand,and the molecular structure diagram and unit cell stacking diagram were drawn. Reference | Related Articles | Metrics | Comments（0） Select Synthesis of Dimethyl Carbonate by Electroreduction of Carbon Dioxide in Acetonitrile on Graphene-Silver Electrode KUANG Yongbin, YU Xi, YANG Miao, FENG Qiuju Journal of Jishou University(Natural Sciences Edition)    2023, 44 (4): 69-74.   DOI: 10.13438/j.cnki.jdzk.2023.04.008 Abstract （262）      PDF（pc） （10274KB）（126）       Knowledge map    Save In this paper,the improved Hummers method was used to prepare graphene oxide (GO).Electrochemical deposition method was used to deposit graphene and silver on conductive glass at room temperature and pressure to prepare graphene-silver composites.Dimethyl carbonate (DMC) was synthesized by electrochemical reduction of carbon dioxide combined with methanol (CH3OH) and iodide methane (CH3I) in acetonitrile solution with graphene-silver electrode as cathode.On this basis,the effects of different GO volumes,dispersant types and concentrations on the morphology of graphene-silver composites were discussed,and the effects of different electrolytic time on the DMC yield were also discussed.The results showed that the graphene-silver composites had good morphology when the GO volume was 10 mL,dispersant was PVP and dispersant concentration was 0.5 mol/L.When the electrolytic potential was -2.0 V,the temperature was 25 ℃,the supporting salt concentration was 0.1 mol/L,and the electrolytic time was 10 h,the yield of DMC was 36.8%,which was the best experimental conditions. Reference | Related Articles | Metrics | Comments（0） Select Hyperbranched Polytriazole Solid Polyelectrolyte and Its Li-Ion and Zinc-Ion Conductivity OU Xiaoying, LIU Ben, WU Jianhua, PENG Xiaochun Journal of Jishou University(Natural Sciences Edition)    2020, 41 (6): 61-69.   DOI: 10.13438/j.cnki.jdzk.2020.06.012 Abstract （585）      PDF（pc） （2382KB）（322）       Knowledge map    Save Hyperbranched polymer with rigid structure usually have good solubility, low viscosity and outstanding mechanical properties, which could be used to prepare solid electrolyte. Hyperbranched polytriazole (hb-GPTA) was synthesized due to azide-acetylene click chemistry reaction of alkynyl-based monomer M1 and azido-contained monomer M2 with catalysis by Cu(I). The hb-GPTA exhibited good solubility, film formation property, and thermostability (the thermal decomposition temperature is 35 ℃). The hb-GPTA was doped with LiTFSI and Zn(OTf)2 respectively to prepare solid electrolytes whose electrochemical properties were characterized. The results demonstrated that LiTFSI doped polymer had higher conductivity of 3.27×10-5 S/cm and the electrochemical window is 5.2 V, while the Zn(OTf)2 doped polymer exhibited lower conductivity of 4.20×10-7 S/cm but remained stable within the voltage range of -1~ 6V. It could be inferred that polymer with triazole has potential application value in making zinc batteries together with electrochemical stability analysis. Reference | Related Articles | Metrics | Comments（0） Select Cu/Fe Co-Catalyzed Cascade Addition/Cyclization of Alkenes Toward Isoquinolinediones XIA Lülu,WANG Liangneng,LI Zengzeng,SHENG Huixiang,TANG Shi Journal of Jishou University（Natural Sciences Edition)    DOI: 10.3969/j.cnki.jdxb.2018.04.013 Select Current Situation of Soil Heavy Metal Pollution in China and Countermeasures SONG Yuting,PENG Shicheng Journal of Jishou University（Natural Sciences Edition)    DOI: 10.3969/j.cnki.jdxb.2018.05.014 Select Structure of the Cobalt-Based Oxide and Its Catalytic Performance in Oxidation of Toluene HU Xiuzhen,JIANG Chongwen,ZHU Jundong,LONG Jie,SONG Quzhi Journal of Jishou University（Natural Sciences Edition)    DOI: 10.3969/j.cnki.jdxb.2018.03.013 Select Synthesis and Fluorescence Properties of the Tb(N-HPA)3(TPPO)2 Complex WANG Ying,MA Dongyun,HAN Ziyue Journal of Jishou University（Natural Sciences Edition)    DOI: 10.3969/j.cnki.jdxb.2018.03.014 Select Simple Synthesis of Pharmaceutical Intermediates  of β-Halogenated Phenethylamine YU Jian,LI Zengzeng,JIANG Ting,LEI Qian,SHENG Huixiang,GUAN Mengdan,HOU Kun,YUAN Li,LI Pei,LI Ling,TANG Shi Journal of Jishou University（Natural Sciences Edition)    DOI: 10.3969/j.cnki.jdxb.2018.03.015 Select Adsorption of Tannin-Based Phenolic ResinModified by Resorcinol for Caffeine ZOU Ting,ZHOU Qian,YUAN Hua,ZHANG Qianan,SU Wanli,PENG Zhiyuan Journal of Jishou University（Natural Sciences Edition)    DOI: 10.3969/j.cnki.jdxb.2017.03.013 Select Synthesis of Fluorinated Isoquinoline-1,3-Dione via Light-Catalysis Addition and Cyclization of Alkenes ZHANG Qian,WANG Qiong,DENG Youlin,WANG Shuowen,YUAN Li,WU Yiting,TANG Shi Journal of Jishou University（Natural Sciences Edition)    DOI: 10.3969/j.cnki.jdxb.2017.03.014