Wei Chenjie, Lin Ligang, Zhao Yiping, Zhang Xiaoye, Yang Ning, Chen Li, Huang Xiaojun
State Key Laboratory of Separation Membranes and Membrane Processes/National Center for International Joint Research on Separation Membrane, School of Materials Science and Engineering, Tiangong University, Tianjin 300387, P. R. China.
MOE Key Laboratory of Macromolecular Synthesis and Functionalization, Department of Polymer Science and Engineering, Zhejiang University, Hangzhou 310027, P. R. China.
ACS Appl Mater Interfaces. 2020 Apr 22;12(16):19130-19139. doi: 10.1021/acsami.9b22881. Epub 2020 Apr 10.
The efficient treatment of oil-water emulsions under acidic condition remains a widespread concern. Poly(amidoamine) (PAMAM) dendrimer with hyperbranched structures and a large amount of primary and tertiary amino groups has exhibited advantages to solve this issue. Here, a novel poly(vinylidene fluoride)--(SiO nanoparticles and PAMAM dendrimers) (PVDF--SiO NPs/PAMAM) membrane was fabricated using a surface-grafting strategy. SiO NPs were immobilized on PVDF--poly(acrylic acid) (PAA) membranes for improving the surface roughness, and PAMAM dendrimers were further immobilized on the membrane surface by interfacial polymerization (IP) for improving the surface energy. The obtained membrane demonstrated a water contact angle and a stable underwater-oil contact angle of 0° and >150°, respectively. These characteristics endowed the membrane with excellent water permeability [>3100 L/(m·h) at 0.9 bar] and separation efficiency (>99%) during oilwater separation. Furthermore, the PAMAM chain will extend from a collapsed state into a fully extension state because of the protonation of amine groups under acidic condition, thus achieving a low underwater oil-adhesion property, fouling resistance, desirable stability, and recyclability (over 12 cycles) during usage. This work shows a promising prospect for the treatment of corrosive emulsions under acidic condition.
在酸性条件下对油水乳液进行有效处理仍是一个广泛关注的问题。具有超支化结构以及大量伯氨基和叔氨基的聚（酰胺胺）（PAMAM）树枝状大分子在解决这一问题方面展现出了优势。在此，采用表面接枝策略制备了一种新型的聚偏氟乙烯 - （二氧化硅纳米颗粒和PAMAM树枝状大分子）（PVDF - SiO NPs/PAMAM）膜。将SiO NPs固定在PVDF - 聚（丙烯酸）（PAA）膜上以提高表面粗糙度，然后通过界面聚合（IP）将PAMAM树枝状大分子进一步固定在膜表面以提高表面能。所制备的膜的水接触角和稳定的水下油接触角分别为0°和>150°。这些特性赋予了该膜优异的水渗透性[在0.9巴压力下>3100 L/(m·h)]以及油水分离过程中的分离效率（>99%）。此外，由于酸性条件下胺基的质子化，PAMAM链将从塌陷状态伸展为完全伸展状态，从而在使用过程中实现低水下油粘附性、抗污染性、良好的稳定性和可回收性（超过12个循环）。这项工作为酸性条件下腐蚀性乳液的处理展现出了广阔的前景。
