Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
5358361 | Applied Surface Science | 2014 | 6 Pages |
Abstract
With the wide distribution and gradual increase of TMC concentration (CTMC) from 1Â ÃÂ 10â4Â wt% to 2.5Â ÃÂ 10â1Â wt%, the main purpose of this work is to simulate the surface structure and properties of polyamide layer of reverse osmosis membranes at its different growth stage. The surface structure and properties of the resulted membranes were then characterized by atomic force microscopy (AFM), scanning electron microscope (SEM), attenuated total reflectance infrared (ATR-IR) spectroscopy, drop shape analysis system and electrokinetic analyzer. The structure growth of polyamide layer underwent in turn three different stages including spherical aggregator, leaf-like and typical ridge-valley structure. Spherical aggregator is the intrinsic structure in the inner layer of polyamide while leaf-like structure is transitional on the outmost polyamide layer. Furthermore, to clarify the effect of the structure change on the properties of polyamide layer, contact angle and zeta potential in the surface of polyamide layer were studied. Hydrophilic surface of polyamide layer is accessible at higher TMC concentration because of the presence of negative charged groups. Performances of the membranes were further measured with an emphasis on studying its structure-performance relationship during the growth process of polyamide layer.
Related Topics
Physical Sciences and Engineering
Chemistry
Physical and Theoretical Chemistry
Authors
Yan Jin, Songmiao Liang, Zongce Wu, Zhiqi Cai, Ning Zhao,