活性艳红K-2G与环糊精相互作用的极谱伏安法研究

研究了单偶氮染料活性艳红K-2G的极谱伏安行为。实验表明：在底液为0．1mol／L的NaGl溶液中活性艳红K-2G有一稳定的、灵敏的还原峰,峰电位约为-0．78mV（vs．SEE）。用线性扫描二阶导数极谱法研究了活性艳红K-2G与不同环糊精的相互作用。采用“电流法”测定了包结常数,比较了不同类型环糊精的包结能力,初探了包结点的可能位置,并对其进行了理论分析。     

用极谱法研究酸性大红GR与环糊精超分子体系

本文用线性扫描二阶导数极谱法研究了酸性大红与各种环糊精的超分子体系;测定了它们的包结常数和包结比,比较了它们的包结能力,初步探讨了影响包结能力大小的可能因素。     

钛基RuOx-PdO电极光电降解活性艳红K-2BP的研究

以自制钛基RuOx-PdO电极为阳极, 钛片为阴极, NaCl、NaNO3、Na2SO4等为支持电解质, 研究了活性艳红K-2BP的光电降解行为. 结果表明, 钛基RuOx-PdO 电极光电降解活性艳红K-2BP时, 其适用性较强, 可在低电流密度、较大的pH值区间和较宽的废污物浓度范围内达到较好的脱色效果；在pH≈6.0、NaCl浓度为0.02 mol·L-1、电流密度为0.25 mA·cm-2及室温条件下, 20 mg·L-1活性艳红K-2BP溶液经光电降解30 min, 脱色率可以达到91.6%. 在本实验条件下, 活性艳红K-2BP的脱色降解主要是光电降解与电生活性氯在紫外光照下生成HO?誗、O-和Cl?誗等强活性物种共同作用的结果.     

meso-四(4-甲氧基-3磺酸基苯)卟啉与环糊精超分子体系的研究

采用极谱法、紫外可见光谱法及荧光光谱法研究了水溶性卟啉T(4-Mop)PS4与α-CD、-βCD、γ-CD、Hp-β-CD及SBE--βCD 5种环糊精的相互作用,结果表明T(4-Mop)PS4分别与这5种环糊精形成了T(4-Mop)PS4-CD s超分子体系。此外,本研究还采用极谱法、紫外可见光谱法及荧光光谱法测定了T(4-Mop)PS4-CD s超分子体系的包结常数和包结比,比较了T(4-Mop)PS4与5种环糊精的包结能力,并由此推测了包结机理,为T(4-Mop)PS4卟啉、环糊精的进一步应用提供了理论信息。     

用电化学分析法研究碱性染料与β-环糊精的包结作用

采用单扫描极谱法考察了β-环糊精对15种不同结构类型的碱性染料在不同支持电解质中电化学性质的影响;用“电流法”测定了包结常数;比较了不同主客体分子之间的包结作用,探讨了包结物在形成过程中的多种影响因素。结果表明,碱性染料环糊精包结物的形成受支持电解质,染料分子的结构类型及亲水性等多种因素的制约,而体积相适为包结作用的决定性因素。     

光电催化降解活性艳红K-2BP中电解质NaCl和Na2SO4的作用研究

以TiO₂/Ti为阳极, Ti网为阴极, 研究了活性艳红K-2BP在NaCl和Na₂SO₄电解质中的降解情况, 深入探讨了两种电解质在光电催化降解染料中的作用, 研究了电解质浓度、溶液pH值的影响, 并讨论了在混合盐电解质存在下, 活性艳红K-2BP的降解行为. 研究表明, 以NaCl为电解质时, Cl^－会转化为氧化性很强的活性氯, 活性氯及光电的共同作用, 加速了染料的降解. 以Na₂SO₄为电解质时, SO₄^2－在光电的作用下将发生两类反应, 一部分SO₄^2－捕获光生空穴和HO•, 对光电催化降解染料起抑制作用; 另一部分SO₄^2－将发生反应生成H₂O₂, 对染料降解起促进作用. 关键词 光电催化; 活性艳红K-2BP; TiO₂/Ti电极; 电解质     

光电催化降解活性艳红K-2BP中电解质NaCl和Na2SO4的作用研究

以TiO₂/Ti为阳极, Ti网为阴极, 研究了活性艳红K-2BP在NaCl和Na₂SO₄电解质中的降解情况, 深入探讨了两种电解质在光电催化降解染料中的作用, 研究了电解质浓度、溶液pH值的影响, 并讨论了在混合盐电解质存在下, 活性艳红K-2BP的降解行为. 研究表明, 以NaCl为电解质时, Cl^－会转化为氧化性很强的活性氯, 活性氯及光电的共同作用, 加速了染料的降解. 以Na₂SO₄为电解质时, SO₄^2－在光电的作用下将发生两类反应, 一部分SO₄^2－捕获光生空穴和HO•, 对光电催化降解染料起抑制作用; 另一部分SO₄^2－将发生反应生成H₂O₂, 对染料降解起促进作用. 关键词 光电催化; 活性艳红K-2BP; TiO₂/Ti电极; 电解质     

酸性深蓝5R的极谱分析方法及其与环糊精的超分子体系研究

建立并研究了酸性深蓝 5R(AC5R)的极谱分析法.结果表明,在pH=7. 0的Na2HPO4 KH2PO4底液中,AC5R产生一峰形好、稳定、灵敏的还原峰,其峰电位EP约 -0. 60V(vs.SCE),峰电流及二阶导数极谱峰高随AC5R浓度变化的线性范围在 3. 0×10-8 ~6. 0×10-5 mol/L(r=0. 992 6 ~0. 999 1 ),检测限为 6. 0×10-9mol/L.RSD为 1. 16% (n=10),标准回收率在 95. 85% ~103. 3%之间,可望用于AC5R的定量分析.此外,还应用极谱伏安法研究了各种环糊精对AC5R电化学行为的影响和超分子体系;利用电流法测定了AC5R与α CD、β CD、γ CD、DM β CD、TM β CD、HP γ CD的包结常数和包结比,比较AC5R与不同类型环糊精的包结能力,并初步研究影响包结能力大小的可能因素.     

用3种不同方法研究铬黑-T与β-CD的相互作用

本文以极谱法、荧光光谱法和紫外可见光谱法研究了铬黑-T与β-环糊精(β-CD)的相互作用。实验结果表明,二者可发生作用,形成铬黑-T-β-CD的超分子体系。此外,本文还分别采用极谱法和紫外可见光谱法对铬黑-T-β-CD的超分子体系的包结比和包结常数进行测定,包结比为1∶1,包结常数为6.05×106L/mol,并初步推断了铬黑-T和β-CD的结合形式。     

活性艳红K—2BP吸光光度法测定二氧化氯

二氧化氯氧化脱色活性艳红K-2BP(PR K-2BP),利用吸光光度法对二氧化氯溶液的浓度进行分析.研究了时间、温度,pH值对方法的影响及Cl0_3~-、ClO~-、Cl~-几种干扰离子的影响.结果表明,反应时间≥25min,pH在7～9之间,温度恒定室温;CI~-对反应无影响,ClO~-和ClO_3~-分别有不同的干扰.所测数据和碘量法相吻合.     

Electrochemical Study on Reactive Red 15 and its Interaction with Cyclodextrins

In this paper, the electrochemical behavior of the interaction of Reactive Brilliant Red K-2G (C.I. Reactive Red 15) with cyclodextrins in 0.1 mol · l⁻¹ NaCl (pH 6.9) has been studied by polarography and voltammetry. In a supporting electrolyte of NaCl (pH 6.9), a sensitive second derivative reduction peak (i _p ″) of Reactive Red 15 was found by linear sweep voltammetry (LSV). The peak potential is about −0.78 V (versus SCE). On the addition of CDs into the Reactive Red 15 solution, the reduction peak current (i _p ″) of Reactive Red 15 decreases and the peak potential (E _p ) shifts to a more positive potential. The study shows that Reactive Red 15 can form 1:1 inclusion complexes with nine CDs. The inclusion constants were calculated by “electric current method”. Furthermore, the inclusion ability of different kinds of cyclodextrins was compared, which provided some elemental data for application of Reactive Red 15 and cyclodextrins.     

Sorption Kinetics of Acid and Reactive Dyes on Wool Fiber in the Presence of Redox Systems

Low-temperature dyeing with Acid Bordeaux and Reactive Brilliant Red 5CX is studied.     

Solid-phase extraction and simultaneous determination of trace amounts of sulphonated and azo sulphonated dyes using microemulsion-modified-zeolite and multivariate calibration

A simple and rapid analytical method for the determination of trace levels of five sulphonated and azo sulphonated reactive dyes: Cibacron Reactive Blue 2 (C-Blue, trisulphonated dye), Cibacron Reactive Red 4 (C-Red, tetrasulphonated azo dye), Cibacron Reactive Yellow 2 (C-Yellow, trisulphonated azo dye), Levafix Brilliant Red E-4BA (L-Red, trisulphonated dye), and Levafix Brilliant Blue E-4BA (L-Blue, disulphonated dye) in water is presented. Initially, the dyes were preconcentrated from 250 ml of water samples with solid-phase extraction using natural zeolite sample previously modified with a microemulsion. The modified zeolite exhibited an excellent extraction for the dyes from solution. The parameters that influence quantitative recovery of reactive dyes like amount of extractant, volume of dye solution, pH, ionic strength, and extraction-elution flow rate were varied and optimized. After elution of the adsorbed dyes, the concentration of dyes was determined spectrophotometrically with the aid of principle component regression (PCR) method without separation of dyes. The results obtained from PCR method were comparable to those obtained from HPLC method confirming the effectiveness of the proposed method. With the aid of SPE by M-zeolite, the concentration of dyes could be reproducibly detected over the range 25-200 ppb for C-Yellow and L-Blue and from 50 to 250 ppb for C-Blue, C-Red, and L-Red. The multivariate detection limits of dyes were found to be 15 ppb for C-Yellow and L-Blue and 25 ppb for C-Blue, C-Red, and L-Red dyes. The proposed chemometric method gave recoveries from 85.4 to 115.3% and R.S.D. from 1.0 to 14.5% for determination of the five dyes without any prior separation for solutes.     

Thermal analysis of cyclodextrins and their inclusion compounds

This review examines the literature concerning the thermal properties of natural and semisynthetic cyclodextrins and their inclusion compounds. Particular emphasis is given to recent results of investigations by thermal methods of the hydrated forms of cyclodextrins. The limitations and advantages of the applications of thermal analyses concerning water- and drug-cyclodextrin interactions are also discussed.     

B位掺杂GdCo1-xSrxO3的制备及其光催化活性

用柠檬酸络合法制备了钙钛矿型GdCo1-XSrXO3(X=0.00, 0.02, 0.04, 0.06, 0.08)复合氧化物, 通过XRD, TEM 等手段对所生成纳米晶的物相结构、微观形貌、颗粒大小等进行了表征. 结果表明, 所合成的颗粒为钙钛矿型纳米晶, 球形. 通过其对活性艳红 X-3B 降解对其光催化活性进行了研究, 实验结果表明在B 位掺杂 Sr2+ 后使GdCoO3 的光催化活性明显提高, 当X=0.06 时, 即GdCo0.94Sr0.06O3 的光催化活性最佳.     

柠檬酸络合法制备La1-xPbxFeO3及其光催化性能

用柠檬酸络合法制备了钙钛矿型复合氧化物LaFeO3,并按不同比例进行掺杂,制备了La1-xPbxFeO3(x=0,0.1,0.3,0.5,0.7)。用XRD,SEM,IR,UV-vis等方法对其进行表征,其结构均为钙钛矿型。并测定了其对活性艳红X-3B水溶性染料脱色的光催化活性。实验结果表明:在A位掺杂Pb2 ,产生了较多氧空位,降低了光生电子与空穴的复合速率,使LaFeO3的光催化活性明显提高,其中La0.7Pb0.3FeO3效果最佳。     

A comparative study of complexation of enalapril with α-, β- and γ-cyclodextrins in aqueous medium: structure elucidation of inclusion complexes using NMR spectroscopic and molecular mechanics methods

Structural studies of complexes of enalapril maleate with α-, β- and γ-cyclodextrins were carried by NMR spectroscopy and computational methods. The formation of complexes of enalapril with all the three cyclodextrins was established by chemical shift changes observed in the cavity protons of cyclodextrins in the presence of enalapril maleate. The stoichiometry of the complexes was determined to be 1:1 by ¹H NMR titrations studies using Scott’s method. Intermolecular cross peaks observed in the 2D ROESY spectra of mixtures of enalapril maleate with three cyclodextrins helped in establishing the probable structures of these inclusion complexes which were supported by molecular mechanics (MM2) studies. Enalapril forms 1:1 inclusion complex with all the studied cyclodextrins through aromatic ring. The mode of approach of aromatic ring to the α-cyclodextrin cavity was found to be different from those of β- and γ-cyclodextrins, which were identical.