Key Laboratory of Photochemical Conversion and Optoelectronic Materials, Technical Institute of Physics and Chemistry, Chinese Academy of Sciences, Beijing 100090, People's Republic of China.
Langmuir. 2011 Oct 4;27(19):11806-12. doi: 10.1021/la202093s. Epub 2011 Sep 12.
A surface molecular imprinted layer-by-layer (SMILbL) film was fabricated on a polyethersulfone (PES) porous membrane substrate for selective filtration of cations and anions. The LbL deposition procedure and the ultraviolet (UV) cross-linking of the modified membrane were monitored by attenuated total reflection-infrared (ATR-IR) spectra. The SMILbL-PES membrane with 4.5 bilayers of diazoresin (DAR)/poly(acrylic acid) complexed with 5,10,15,20-tetrakis(4-(trimethylammonio)-phenyl)-21H,23H-porphyrin tetratosylate (PAA-Por(4+)) effectively reduced the permeation velocity of Por(4+) after washing the Por(4+) template out. In comparison to a control film DAR/PAA-modified PES membrane (ConLbL-PES) in a dialysis experiment, the SMILbL-PES membrane exhibited better selectivity for permeation of 5,10,15,20-tetraphenyl-21H,23H-porphine-p,p',p″,p‴-tetrasulfonic acid tetrasodium hydrate (Por(4-)) against permeation of Por(4+). In pressure-driven transport experiments, the SMILbL-PES membrane showed a much longer blocking time for Por(4+) than for Por(4-), indicating the selective loading of Por(4+) into the SMILbL film. The surface charge of the SMILbL-PES membrane after Por(4+) loading was higher than that of other membranes, resulting in an enhanced rejection ability of the SMILbL-PES membrane to Por(4+) caused by Coulomb repulsion. A possible mechanism was proposed as follows. The binding sites generated through imprinting in the SMILbL-PES membrane enable loading of a larger amount of Por(4+). The stronger repulsion between Por(4+) and the SMILbL film may cause the main contribution to the selective rejection of Por(4+). It can be easily imagined that this concept can be extended to the construction of composite membranes from other imprinting systems.
一种表面分子印迹层层（SMILbL）膜被制备在聚醚砜（PES）多孔膜基底上，用于阳离子和阴离子的选择性过滤。通过衰减全反射-红外（ATR-IR）光谱监测 LbL 沉积过程和改性膜的紫外（UV）交联。具有 4.5 层重氮树脂（DAR）/与 5,10,15,20-四（4-（三甲基铵基）-苯基）-21H，23H-卟啉四对甲苯磺酸酯（PAA-Por（4+））复合的聚（丙烯酸）的 SMILbL-PES 膜在洗掉 Por（4+）模板后有效地降低了 Por（4+）的渗透速度。与在透析实验中 DAR/PAA 修饰的 PES 膜（ConLbL-PES）的对照膜相比，SMILbL-PES 膜对 5,10,15,20-四苯基-21H，23H-卟啉-p，p'，p''，p''' -四磺酸四钠盐一水合物（Por（4-））的渗透表现出更好的选择性，而对 Por（4+）的渗透则较差。在压力驱动传输实验中，SMILbL-PES 膜对 Por（4+）的阻断时间比 Por（4-）长得多，表明 Por（4+）选择性地载入 SMILbL 膜。载入 Por（4+）后 SMILbL-PES 膜的表面电荷高于其他膜，导致 SMILbL-PES 膜对 Por（4+）的排斥能力增强，这是由于库仑排斥的结果。提出了一种可能的机制，即 SMILbL-PES 膜中的印迹生成的结合位点能够负载更多的 Por（4+）。Por（4+）和 SMILbL 膜之间更强的排斥可能是选择性排斥 Por（4+）的主要原因。可以想象，这个概念可以扩展到其他印迹体系的复合膜的构建。
