阳离子染料可染丙纶的结晶特性和形态结构研究

将自制可染剂通过与聚丙烯共混纺丝生产的阳离子染料可染丙纶进行 X射线衍射分析和SEM观察研究。结果表明 :可染丙纶的晶粒尺寸 ( L110 )越大 ,其染色性能越好 ;可染剂与聚丙烯有一定的相容性 ,并且能均匀分散在聚丙烯中 ,使纤维上染率达到 90 %以上。     

锦/棉织物一浴法染色工艺探讨

本文对活性染料染锦/棉交织物的染色工艺进行了系统研究。根据活性染料的染色特征值SERF值从大到小的顺序筛选了三组活性染料,分别对先酸后碱工艺和应用pH值调节剂A工艺的染色效果作了比较研究。结果表明:SERF值中等的染料适用于上述两种工艺。先酸后碱工艺的固色率可达70%,摩擦牢度和皂洗牢度分别为4～5级,同色性较好。应用pH值调节剂A的工艺固色率可达80%,摩擦牢度和皂洗牢度分别为4～5级,且同色性较好。     

新型染料敏化体系──荧光素染料碘鎓盐的光谱研究

本文合成了一系列荧光素类染料碘盐，并研究了其光谱及光化学性质。结果表明，通过改变结构，可改变它们的吸收光谱。提出可用Ｉ＿Ⅰ／Ｉ＿Ⅱ值来表征这类化合物在溶剂中的相对解离程度。随溶剂极性，染料母核Ｃ－６位周围（Ｃ－７，Ｃ－８位）空间位阻增大和染料母核上吸电子取代基增多，Ｉ＿Ⅰ／Ｉ＿Ⅱ值增大，它们的相对解离程度升高，光谱性质显著变化，光化学反应速度下降。在极性和非极性溶剂中，浓度对光谱和光化学性质具有不同的影响。显示这类化合物除可用作可见光敏化聚合和交联的光引发体系外，还可能用作探针探测周围环境的变化。     

杂多酸光催化降解染料废水的研究进展

综述了杂多酸对染料废水光催化降解的负载材料,包括负载型多酸．氧化物,缺位型多酸-有机胺-氧化物,缺位型多酸-氧化物以及其它POM复合光催化剂。杂多酸与有机物反应的机理主要是电子-空穴对的产生和OH等自由基的生成。概述了杂多酸光催化作用的优点和局限性,提出提高光催化反应的量子效率解决方法。     

Corrosion inhibition of mild steel in acidic media by Basic yellow 13 dye

The inhibition performance of Basic yellow 13 dye on mild-steel corrosion in hydrochloric acid solution was studied at 25 °C using weight loss and electrochemical techniques. The effect of inhibitor concentration on inhibition efficiency has been studied. Inhibition efficiency increased with increase of Basic yellow 13 concentration. The results showed that this inhibitor had good corrosion inhibition even at low concentrations (95% for 0.005 M Basic yellow 13) and its adsorption on mild-steel surface obeys Langmuir isotherm. ΔG _ads was calculated and its negative value indicated spontaneous adsorption of the Basic yellow 13 molecules on the mild-steel surface and strong interaction between inhibitor molecules and metal surface. The value of ΔG _ads was less than 40 kJmol⁻¹, indicating electrostatic interaction between the charged inhibitor molecules and the charged metal surface, i.e., physical adsorption.     

蛋壳膜对有机染料的吸附脱色作用研究

蛋壳膜是一种大孔型的生物活性吸附材料,具有较大的比表面积。研究了蛋壳膜对有机染料曙红B的吸附脱色作用。试验考察了吸附时间、溶液pH值、温度对吸附脱色的影响。吸附平衡时间为100min;最佳pH值吸附条件为2．0;蛋壳膜对曙红B的吸附量随温度升高而增加。在常温下,蛋壳膜对曙红B的脱色率达95％以上,最大吸附量为40．9mg／g,其吸附行为符合Freundlich吸附等温线。     

Xanthene dyes/amine as photoinitiators of radical polymerization: A comparative and photochemical study in aqueous medium

The efficiency of several xanthene dyes as photoinitiators of the free radical polymerization in aqueous medium was evaluated. These results show that dyes with triplet quantum yield higher than 0.1 present similar efficiencies, independently of their different chemical structure. A detailed study of the photophysics of the dyes under the polymerization conditions was carried out using laser time-resolved spectroscopies. These studies show that the active radicals are those which formed in the interaction of excited triplet state of the dye with the amine through an electron transfer process. In spite of this, the photoinitiation efficiency is not correlated with the triplet quantum yield. Also, the photophysics studies show that the quantum yield of the different pathways of the decomposition of the charge transfer intermediate is an important parameter to predict the efficiency of these photoinitiator systems. The experimentally measured active radical formation is well correlated with that calculated from the polymerization rate. The presence of heavy atoms in the xanthene ring increases the triplet quantum yield, but decreases the active radical yield, and then the polymerization rate.     

水热法合成钛酸锶光催化剂及其降解不同染料对环境净化的影响研究

采用水热合成法并使用TiO_2和Sr (OH)_2·8H_2O和NaOH作为原始材料制备了SrTiO_3光催化剂。XRD结果表明,合成的SrTiO_3光催化剂为立方相,晶粒尺寸约为52 nm。光学性质分析表明,SrTiO_3光催化剂具有强的紫外可见光吸收能力,Eg值为2.93 eV。光催化实验表明,SrTiO_3光催化剂对染料降解具有较强的选择性,最佳的降解染料是刚果红。     

由飞灰合成的沸石吸附废水中染料的动态平衡

The removal performance of a basic dye, methylene blue (MB), in aqueous solution was investigated by adsorption process on single-phase and high-crystalline zeolite A (FA-ZA) and X (FA-ZX). Both adsorbents FA-ZA and FA-ZX were synthesized from fly ash prepared aluminosilicate gel followed by the hydrothermal treatment at 100°C with the control of Si/Al molar ratio, respectively. The properties of the synthetic zeolites and commercial grade zeolites, such as thermal stability, elemental composition, and cation exchange capacity, were investigated for comparison. Batch method was used to study the influential parameters, such as initial pH value of the solution, temperatures, and adsorbents dosage, on the adsorption process. The experimental data were well fitted by Ho’ pseudo-second-order model and liquid film diffusion model. The suitability of Langmuir and Freundlich isotherms to the equilibrium data was investigated in the solid-liquid system while the Langmuir model produces the best re-sults. Thermodynamic data (ΔH, ΔS, and ΔG) corresponding to the MB uptake were evaluated from the Langmuir model. In all the adsorption experiments, the adsorption capacity followed the order as follows: FA-ZX > FA-ZA. In addition, attempts were also made to regenerate the adsorbents.