光电催化降解邻苯二甲酸二乙酯的研究

采用sol-gel法制备TiO2薄膜光电极，以该电极为工作电极，铂丝作对电极，饱和甘汞电极为参比电极，对邻苯二甲酸乙酯的光电催化降解进行了研究。结果表明：该电极具有n型半导体的特征行为，在外加偏压为＋0．7v、pH=2、50mg／L的H2O2中对初始浓度为50mg／L的DEP溶液光照180min降解率达67．85％，讨论了氧的存在、外加偏压等因素对光电催化反应的影响。     

以硫醚为主链的螯合树脂研究Ⅰ.4-氨基安替吡啉树脂和乙基原磺酸基树脂的合成及吸附性能

聚环硫氯丙烷或环硫氯丙烷与环氧氯丙烷共聚物，在少量二乙烯三胺存在下制得交联预聚物，将交联预聚物与4－氨基安替吡啉（4AAP）或乙基原磺酸钾（PEA）反应，制得四种侧链带氨基安替吡啉，乙基原碘酸基的新型螯合树脂。它们对贵金属具有优良的吸附性能和高的吸附选择性。并通过X－射线光电子能谱初步探讨了树脂对金属离子的螯合作用。     

Synthesis of inorganic-organic hybrids by incorporation of inorganic components into organic polymer using metal alkoxides

Inorganic-organic hybrids have been synthesized by incorporation of the inorganic component of Ti(OC₂H₅)₄ into the organic polymer of ethyl cellulose. The inorganic-organic hybrids did not dissolve in toluene used as a solvent for the starting materials. The ethanol was formed as a by-product of the alcoholysis condensation reaction between Ti(OC₂H₅)₄ and ethyl cellulose. These results suggest that ethoxy groups of Ti(OC₂H₅)₄ react with hydroxy groups of ethyl cellulose to form cross-linking bonds of –O–Ti–O–. The reaction of Ti(OC₂H₅)₄ with ethyl cellulose was further investigated by Fourier transform infrared (FT-IR) spectroscopy. The FT-IR spectroscopic experiments revealed that the Ti–O bond state of Ti(OC₂H₅)₄ was changed by refluxing a toluene solution of Ti(OC₂H₅)₄ with ethyl cellulose. The inorganic-organic hybrids have an interesting dielectric property; their dielectric constant is higher than that of ethyl cellulose and that of a simple mixture of TiO₂ and ethyl cellulose.     

Thermal stability of products prepared by the combination of cyclodextrins and zeolites

Derivatographic and calorimetric measurements were used to study the thermal properties of combined inclusion compounds of zeolite-cyclodextrin type and of zeolite-cyclodextrin-pharmaceutical type. There were differences in the characteristic decomposition temperature intervals and in the modes of cyclodextrin and pharmaceutical liberation from the products. Calorimetric measurements revealed that the process in the newly-formed complex host is connected with a glass transition. The products are intended for use in veterinary medicine.     

Comparison of micro- and mesoporous inorganic materials in the uptake and release of the drug model fluorescein and its analogues

The uptake of the three species of the drug model fluorescein (fluorescein sodium salt (FNa), fluorescein free acid (F), and fluorescein diacetate (FDA)) by zeolite NaX and the mesoporous zeotype MCM-41 was investigated as well as their release rates into solutions at pH 7 and pH 4.5. UV/Vis analysis was carried out at a wavelength of 490 nm. Uptakes of the sodium salt of 9 % for zeolite X and 14 % for MCM suggest little penetration of the pores. The use of ethanol as the loading solvent for F resulted in little uptake for both zeolitic materials due to the successful competition of the ethanol for binding sites. Use of acetone (weaker proton acceptor) as loading solvent significantly improved the uptake of F to 17 % and 12 % for zeolite X and MCM, respectively, whilst the uptake of FDA in acetone increased still further to 22 % and 17 % for zeolite X and MCM, respectively. Generally there was a large initial release of the fluorescein analogues from the surface of the zeolites with very little further increase over time. The prescence of an esterase enzyme in the release medium of FDA tripled the release from MCM to 15 % but left the release from zeolite X unaffected at 6 %. The results obtained show that uptake of fluorescein and its analogues is dependent on the loading solvent used, the amount released is influenced by not only the solvent but the pH and the presence of enzymes in the release medium.     

含硫希夫碱的合成研究

合成了一种含硫希夫碱—1，4-双[(2’-甲醛缩硫代氨基脲基)苯氧甲基]乙烷及其中间产物1，4-双[(2’-甲醛)苯氧甲基]乙烷．其结构经元素分析，IR和1H NMR表征。     

二(顺丁烯二酸异丙酯酰氧基)-异丙氧基钕及其与甲基丙烯酸甲酯共聚物的研究

用三异丙氧基钕与顺丁烯二酸酐反应合成含钕单体二（顺丁烯二酸异丙酯酰氧基） 异丙氧基钕，并与甲基丙烯酸甲酯（ＭＭＡ）共聚而制得含钕共聚物．用元素分析、ＩＲ、ＸＰＳ和ＳＥＭ对其结构进行表征，并研究了其热性能、光学性能和磁性．表明含钕共聚物是一种具有优异热稳定性、高透光率和大折光率，以及具有光选择吸收性和顺磁性的高分子材料     

Crystal structure of NH<Subscript>4</Subscript>-substituted chabazite

The structure of NH₄-substituted chabazite, (NH₄)_3.30Ca_0.30Na_0.07K_0.01[Al_3.98Si_8.02O₂₄]·8.4H₂O, (trigonal, space group \(R\bar 3m\), rhombohedral unit cell: a = 9.423(1) Å, α = 94.66(2)°, V = 827.9(2) Å ³, Z = 1) has been determined by single crystal X-ray diffraction. The structure is compared to that of the natural chabazite. NH ₄ ⁺ cations occupy two of four cationic positions of original chabazite, one position being shared with H₂O. Hydrogen atoms were localized and the orientation of NH₄ tetrahedra was revealed. Their low coordination on H₂O determined a substantial decrease of H₂O content in the modified structure.