The stability of monochlorotriazinyl reactive dyes on cellulose films in aqueous alkaline solutions containing peroxide bleaching agents

The stability of seven reactive (one difluoromonochloropyrimidinyl and six monochlorotriazinyl) dyes on cellulose immersed in sodium peroxoborate (PB) solution (UK–TO solution) containing tetraacetylethylenediamine (TAED) was examined using cellulosic films at 60 °C. The extent of dye loss that occurred from the dyed cellulosic films which were immersed in the UK–TO solution without detergent correlated closely to the ratings obtained using the BS 1006 UK–TO wash test. The dye loss that occurred from the dyed cellophane films was attributed to three contributions, namely, alkaline hydrolysis of dye–fibre bonds, oxidative fading of the dye chromophore by peroxides and cellulose degradation accelerated by PB and TAED. The alkaline hydrolysis of the dye–fibre bond and the extent of cellulose degradation in the UK–TO solution were the main contributions to the dye loss; dye oxidation was a minor factor in the dye loss mechanism. The physical bonding of the dye molecules reinforced the covalent dye–fibre bond stability towards the UK–TO solution.     

分散染料的近期进展

介绍了分散料的近期进展，包括原有涂纶织物着色用散染料，超细旦纤维用分散染料，以及分散染料在喷射打印墨水和热转称铖像上的应用，展望了分散染料今后的发展方向。     

丙烯酸β-环糊精酯共聚物对染料的吸附性能

以丙烯酸β-环糊精酯共聚物为吸附剂,采用分光光度法测定该吸附剂对亚甲基蓝和碱性品红溶液的静态吸附效果,考察了吸附时间、体系pH值等对吸附量的影响。结果表明:常温下,亚甲基蓝的较佳吸附条件为静态吸附时间约7h、体系pH=8.0时,最大吸附量达到166.3mg/g;碱性品红的较佳吸附条件为静态吸附时间约7h、体系pH=10时,最大吸附量达到137.9mg/g。该共聚物对亚甲基蓝染料吸附性能更好。     

Removal of Congo Red dye by adsorption onto phyrophyllite

Synthetic dye‐containing wastewaters from textile, paper, plastic and leather‐tanning industries are a most common organic pollutant. Such dyes may be toxic not only to aquatic life, but also to human beings. Consequently, dye removal from wastewater significantly benefits the environment. The aim of this study was to investigate the effectiveness of phyrophyllite as an adsorbent for Congo Red dye from wastewater. Dye sorption rates were investigated in bench‐scale studies. Evaluation of adsorption performance of phyrophyllite on Congo Red necessitated the determination of Langmuir and Freundlich isotherms. Adsorption of Congo Red on phyrophyllite was found to be in conformity with both isotherms. The adsorption capacity for phyrophyllite was found to increase with decrease in particle size and with increase in temperature and intensity of agitation. The results indicated that phyrophyllite was a good adsorbent for Congo Red from wastewaters.     

彩色聚氨酯皮革染料的制备与研究

以甲苯二异氰酸酯（TDI）、聚丙二醇（PPG1000）、2,2－二羟甲基丙酸（DMPA）、单硬脂酸甘油酯（GMS）、酸性红B等为主要原料,经自乳化法合成了一种彩色聚氨酯皮革染料,采用傅立叶红外吸收光谱分析证实了彩色聚氨酯染料的结构。研究发现聚氨酯染料和原染料相比,紫外－可见光谱图显示在200～250nm处的峰出现了38nm的红移;制备的聚氨酯染料乳液具有良好的冻融稳定性和高温稳定性,彩色聚氨酯膜具有较好的耐热性能和优异的耐干湿擦性能。     

印染硫化黑废水的铝盐壳聚糖絮凝试验

采用硫酸铝与壳聚糖复合絮凝剂处理某厂含硫化黑印染废水,通过正交试验对处理效果进行了优化,并进行了吸附动力学研究。结果表明,硫酸铝与壳聚糖可发生化学键合作用,当硫酸铝与壳聚糖复合质量比为10∶1,投加量为30 mg/L,p H为6~10时,对TOC为63.6 mg/L的印染硫化黑废水的TOC去除率达75.22%,脱色率达82.45%。吸附过程符合拟一级动力学方程,吸附活化能为9 k J/mol。     

High Spatial Resolution Imaging of Endogenous Hydrogen Peroxide in Living Cells by Solid‐State Fluorescence

Herein, we describe selective imaging of hydrogen peroxide using a precipitating dye conjugated to a boronic acid‐based immolative linker. We achieved visualization of endogenous hydrogen peroxide in phagosomes by solid‐state two‐photon fluorescence imaging in living cells with exceptionally high spatial resolution.     

Study of Crystal Violet Hueing Dye Deposition on Fabrics During Home Laundry

The influence of hueing dye on the fabric b* value and CIE whiteness during home laundry was investigated using crystal violet dye to study the accumulation mechanism on fabric samples. Fabrics treated with the crystal violet dye had a lower b* value and a higher CIE whiteness. The dye accumulation was much higher on nylon or nylon/lycra blends than on cotton and polyester fabrics. The fabric surface charge and surface energy were also studied, and the dye-fiber interaction was investigated based on fiber and dye molecular structure. The study indicates: (1) the electrostatic adsorption is the main contributor to the deposition and accumulation of hueing dyes on fabrics; (2) fabric surface energy may play an important role in the dye-fiber interaction. The more hydrophobic the fiber surface, the less dye accumulates on the fabric during home laundry.     

凹凸棒石颗粒吸附剂制备及其性能

在凹凸棒石黏土中加入低熔点烧结剂,制备了凹凸棒石颗粒吸附剂。实验表明,在600℃下煅烧20min,该颗粒吸附剂具有较低的散失率和良好的吸附性能。颗粒吸附剂对有机染料阳离子红的吸附等温线属于Langmuir型。