Abstract

Nylon 66, which is an important membrane class used in manufacturing of chitin and chitosan, have a number of features that can be improved by surface functionalizations into a novel composite structure with support of ultrasound and silica gel (SiG) catalyst in a doubled amidation reaction. Firstly, nylon 66/para-phenylenediamine thin film composite (NP-TFC) is prepared from commercial nylon 66 membrane in an ultrasound assisted hydrolysis-amidation reaction. Secondly, carboxylic functionalized multi-walled carbon nanotubes (MWCNT-COOH) are grafted on the NP fiber in an ultrasound assisted/SiG-catalyzed amidation reaction, where para-phenylenediamine (pPD) role is cross-linking. As an excellent result confirmed by either Fourier transform infrared (FTIR), Raman spectrometry or scanning electron microscopic (SEM), bundled MWCNTs bridges are easily built in SiG-catalyzed ethanol media to connect nylon 66 fibers at distances of 0.3–1 μm. The vacuum filtration test confirmed that as-prepared nylon 66/pPD/MWCNTs structure has superior Ca²⁺ rejection efficiency to that of original nylon 66.

摘要

尼龙 66 是用于制造几丁质和壳聚糖的重要膜类，具有许多特征，可以通过表面官能化改善成新型复合结构，并在双酰胺化反应中支持超声波和硅胶 (SiG) 催化剂. 首先，尼龙66/对苯二胺薄膜复合材料（NP-TFC）是由商用尼龙66膜在超声辅助水解-酰胺化反应中制备的。其次，羧基官能化的多壁碳纳米管 (MWCNT-COOH) 在超声辅助/SiG 催化的酰胺化反应中接枝在 NP 纤维上，其中对苯二胺 (pPD) 的作用是交联。作为通过傅里叶变换红外 (FTIR)、拉曼光谱或扫描电子显微镜 (SEM) 证实的优异结果，成束的 MWCNTs 桥很容易在 SiG 催化的乙醇介质中构建，以 0.3-1 μm 的距离连接尼龙 66 纤维。真空过滤试验证实，所制备的尼龙 66/pPD/MWCNTs 结构具有优异的 Ca剔除率比原来的尼龙 66 高²⁺。