活性艳红K-2BP与环糊精相互作用的电化学研究

本文研究了活性艳红K-2BP的极谱伏安行为。实验表明:在0.1 mol/L的NaCl(pH 6.9)底液中,活性艳红K-2BP有一稳定、灵敏的还原峰。用线性扫描极谱法考察了活性艳红K-2BP与环糊精的相互作用,测定了活性艳红K-2BP与各种环糊精的包结比和包结常数;对不同类型环糊精的包结能力进行了比较;初步探讨了影响包结能力大小的可能因素。     

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。     

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。     

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。     

邻氯酚红的电化学行为及其与环糊精超分子体系的研究

本文用极谱法研究了在0.02mol/LHAc NaAc(pH3.8)介质中邻氯酚红以及邻氯酚红 环糊精超分子体系的电化学行为,用电流法测定了二者的包结常数,比较了不同主客体之间的包结作用,并对邻氯酚红的电极反应机理进行了探讨。结果表明:邻氯酚红进行的是两电子转移的还原过程,有一个氢离子参与反应,其还原峰电流与邻氯酚红浓度在3.0×10-6～3.0×10-4mol/L范围内有良好的线性关系。     

《分析试验室》第25卷总目次

研究报告与简报1-1碳酸二甲酯和苯胺胺解反应产物的液相色谱分析…………………………………李芳,苗静,王延吉*,赵新强1-5 X射线荧光光谱法测定Zn镀层质量厚度及计算谱线选择问题研究……………韩小元,卓尚军*,王佩玲,陶光仪1-9活性艳红K-2G与环糊精相互作用的极谱伏安法研究……………………李有琴,潘景浩*,郭玉晶,芦飞,张红芬1-13纳米复合材料催化发光法测定空气中的苯系物……………………………………周考文*,赵艳霞,徐峥,佟岳1-17电化学发光淬灭法测定脑白金胶囊中的褪黑素…………………………储海虹,许海燕,吴莹,胡延维,屠一锋*1-2…     

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。     

活性嫩黄K-4G在碳糊电极上的电化学研究

研究活性染料常用的嫩黄基础谱带——活性嫩黄K-4G，在具有较小表面积（约为0．07cm^2）的碳糊电极上的电化学响应行为。在-1．0～1．3V的扫描电位窗内，活性嫩黄K-4G显示良好的电氧化还原性质，电极反应速率为吸附控制，电极反应机理为先质子化后电氧化还原。     

线性扫描极谱法测定人血清白蛋白

以线性扫描极谱法研究了在pH=6．5的Britton-Robinson缓冲溶液中灿烂甲酚蓝与人血清白蛋白的相互作用。灿烂甲酚蓝在-0．18V(vs．SCE)有一个良好的极谱还原峰,加入人血清白蛋白后,其峰电位负移而峰电流下降,峰电流的下降值同人血清白蛋白的浓度在2．0～60．0mg／L内呈线性关系,线性回归方程为Δip=18．05c 123．65,r=0．9970。     

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.     

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。     

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.     

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.     

A comparative study on characterization and photocatalytic activities of gadolinium–boron codoped and mono-doped TiO2 nanoparticles

Gadolinium?Cboron codoped and mono-doped TiO₂ nanoparticles were prepared using a sol?Cgel method, and tested for photocatalytic activity by the UV light after a further calcination process. For comparison, a pure TiO₂ sample was also prepared and tested under the same conditions. The prepared catalysts were characterized by X-ray diffraction, scanning electron microscope, and UV?CVis spectra. The photocatalytic activity of the samples was evaluated through the photo-degradation of three different dyes under UV light. The experiments demonstrated that the gadolinium?Cboron codoped TiO₂ (Gd?CB?CTiO₂) sample calcined at 500?°C possessed the best photocatalytic activity, and the photodegradation rate of the Reactive Brilliant Red K2G aqueous solution could reach to 95.7% under UV irradiation for 80?min. The results showed that Gd?CB?CTiO₂ has smaller crystallite size and higher photocatalytic activity than that of mono-doped TiO₂ samples and undoped TiO₂.     

Effect of operating conditions on separation performance of reactive dye solution with membrane process

Membrane process has increasingly developed as a reliable and effective means of improving product yield and reducing manufacturing costs in the reactive dye industry. In order to improve a product's quality, ultrafiltration (UF) membrane has been applied to perform Reactive Brilliant Blue KN-R desalting and concentration. The performance of this membrane's separation process was evaluated under different operating conditions, through which the influence of operating pressure, temperature, cross-flow velocity, pH, concentration of feed and operating time on permeate flux, rejection of Reactive Brilliant Blue KN-R and sodium sulfate were studied.     

Comparison of Electrochemical Behavior of Hydroxyl‐substituted and Nonhydroxyl‐substituted Azo Dyes at a Glassy Carbon Electrode

The voltammetric behaviour of four azo dyes has been compared at a glassy carbon electrode. It is shown that the azo dyes (e.g. Reactive Brilliant Red x‐3b (RBR x‐3b), Acid Red 6b (AR 6b)) with a hydroxyl group in the ortho position with respect to the azo bridge give rise to well defined, irreversible peaks for the oxidation and reduction process within a pH range of 2–12. In the case of the non‐hydroxyl azo dye (e.g. Reactive Yellow x‐rg (RY x‐rg)), or azo dye with a meta hydroxyl group (e.g. Reactive Orange x‐gn (RO x‐gn)), the oxidation was comparatively tougher, and the peak was not clear or even invisible in the accessible potential range. The mechanism of electrochemical oxidation of RBR x‐3b, as well as AR 6b is proposed. The reduction steps were only accessible when pH < 8 for RY x‐rg and RO x‐gn dye compounds. For the hydroxyl‐substituted dyes, re‐oxidation peaks were obtained in the subsequent scan, owing to the oxidation of reduction products‐amine or hydroazo intermediates.     

Magnetic dye affinity beads for the adsorption of beta-casein

Casein is well known as a good protein emulsifier and beta-casein is the major component of casein and commercial sodium caseinate. Dye affinity adsorption is increasingly used for protein separation. beta-Casein adsorption onto Reactive Red 120 attached magnetic poly(2-hydroxyethyl methacrylate) (m-PHEMA) beads was investigated in this work. m-PHEMA beads (80-120 microm in diameter) were produced by dispersion polymerization. The dichlorotriazine dye Reactive Red 120 was attached covalently as a ligand. The dye attached beads, having a swelling ratio of 55% (w/w) and carrying different amounts of Reactive Red 120 (9.2 micromol . g(-1)-39.8 micromol . g(-1)), were used in beta-casein adsorption studies. The effects of the initial concentration, pH, ionic strength and temperature on the adsorption efficiency of dye attached beads were studied in a batch reactor. The non-specific adsorption on the m-PHEMA beads was 1.4 mg . g(-1). Reactive Red 120 attachment significantly increased the beta-casein adsorption up to 37.3 mg . g(-1). More than 95.4% of the adsorbed beta-casein was desorbed in 1 h in a desorption medium containing 1.0 M KSCN at pH 8.0. We concluded that Reactive Red 120 attached m-PHEMA beads can be applied for beta-casein adsorption without significant losses in the adsorption capacities.