单宁酸/两性离子改性油-水分离膜的制备及性能

以不锈钢网为基材, 利用单宁酸对不锈钢网进行表面预处理并功能化接枝两性离子基团, 制备了新型亲水和水下超疏油的单宁酸/两性离子改性油-水分离膜(TA-ZW-SSM). 利用X射线光电子能谱仪(XPS)、 扫描电子显微镜(SEM)及接触角测量仪等表征了其化学结构、 形态和润湿性. 研究结果表明, 两性离子基团通过化学键接枝在单宁酸预处理的不锈钢网表面. 油-水分离实验结果表明, 对于不同类型的油-水混合物, 本文制备的超亲水和水下超疏油特性的TA-ZW-SSM可实现重力驱动的高效油-水分离, 并具有较好的化学稳定性及再循环性.

Preparation and Characterization of Tannin/Zwitterionic Modified Oil-water Separation Membrane †

Based on the chemical properties of tannic acid and the special wettability of zwitterionic groups, we successfully prepared the ultrahydrophilic and underwater ultraoleophobic separation membrane. The stainless steel mesh was used as substrate, which was grafted by zwitterionic polymers after pre-treatment with tannic acid. The micro-chemical structure and wettability of the oil-water separation membrane were characterized by X-ray photoelectron spectroscopy(XPS), scanning electron microscope(SEM), and contact angle mea-suring instrument. The results show that zwitterionic groups were grafted through chemical bonding. The obtained oil-water separation membrane enable an efficient and energy-saving separation for various oil-water mixture by gravity-driven. Meanwhile, the membrane demonstrates excellent chemical stability and recyclability.