摘要
Membranes are widely used for protein separation and purification in biotechnology and food processing. However, fouling remains challenges in membrane filtration processes and limits further industrial application. In this study, a facile method for constructing the antifouling alumina membrane via sulfonation modification was comprehensively investigated. FTIR, XPS, FESEM, EDS and zeta potential were used to characterize the sulfonated alumina membrane (Al2O3-SO3H membrane) and confirm that organosilanes grafted on the membrane surface and −SH groups were successfully oxidized to −SO3H. The Al2O3-SO3H membrane showed a strong negative charge in the neutral solution. In the antifouling test, the Al2O3-SO3H membrane exhibited a high permeate flux during the filtration of bovine serum protein (BSA) solution, and its stable permeate flux was approximately-eight times that of the original Al2O3 membrane. This was attributed to the sulfonation of Al2O3 membrane and enhanced electrostatic repulsion. The Al2O3-SO3H membrane also exhibited good antifouling performance in the filtration of bacteria-containing BSA solution. This was attributed to the electrostatic repulsion of the Al2O3-SO3H membrane against BSA molecules, which reduced the adsorption of BSA on the membrane surface and pore walls. Finally, the structural stability and repeatability of the Al2O3-SO3H membrane were investigated. The sulfonated alumina membranes exhibit excellent antifouling performance and are promising for the separation and purification of BSA-containing systems.
源语言 | 英语 |
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文章编号 | 123513 |
期刊 | Separation and Purification Technology |
卷 | 313 |
DOI | |
出版状态 | 已出版 - 15 5月 2023 |