基于纳滤技术的质检萃取液脱色预处理方法

为提高纺织品及皮革甲醛检测效率和准确性,通过界面聚合法,将采用St?ber方法制备的无机颗粒与聚酰胺复合制备有机-无机杂化纳滤膜,用于纺织品和皮革萃取液脱色预处理。分别采用扫描电子显微镜、X射线光电子能谱仪和接触角仪,对颗粒形貌、纳滤膜表面元素及分离层接触角进行分析;通过纯水通量、无机盐和染料截留等对纳滤膜分离性能进行考察;并分析了纳滤脱色预处理法纺织品和皮革甲醛检测的加标回收率。结果表明:粒径分布均匀的球形二氧化硅及银离子修饰的二氧化硅颗粒成功地负载于亲水性良好的纳滤膜分离层;适量颗粒的添加有利于提高纳滤膜的纯水通量;银离子修饰的二氧化硅颗粒改善了纳滤膜对二价阳离子盐及阳离子染料的截留性能,回收率满足纺织品和皮革甲醛检测的要求。

Decolorization pretreatment method of quality inspection extraction solution based on nanofiltration technology

In order to improve the efficiency and accuracy of formaldehyde detection of textiles and leathers, based on the interfacial polymerization, polyamide and inorganic particles prepared by St?ber method was adopted to prepare organic-inorganic hybrid nanofiltration membranes for the decolorization pretreatment of textiles and leathers extract. The particle morphology, surface elements of nanofiltration membranes and contact angle of separation layer were analyzed by using scanning electron microscopy, X-ray photoelectron spectrometry and contact angle metering, respectively. The separation performance of nanofiltration membranes was investigated by pure water flux, inorganic salt and dye retention. The recoveries of formaldehyde detection in textiles and leathers by nanofiltration decoloring pretreatment were also analyzed. Results show that the silicon and silver ion modified silica with uniform particle size are successfully loaded on the nanofiltration membrane separation layer, and the separation layer has good hydrophilicity. The pure water flux of the nanofiltration membrane is improved by virtue of the addition of a moderate amount of particles. The silver ion modified silica improves the entrapment performance of nanofiltration membrane for salt with bivalent cation and cationic dye, and the recoveries meet the requirements of formaldehyde detection of textiles and leathers.