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Updated: Jul 31, 2026
Layer-by-layer Synthesis and Transfer of Freestanding Conjugated Microporous Polymer Nanomembranes
Published on: December 15, 2015
Rendimiento antifouling mejorado de membrana ultrafina de péptidos antimicrobianos mediante ensamblaje químico de
Jiaying Yan1, Panpan Wang2, Jinlong Zhu3
1State Key Laboratory of Urban-rural Water Resource & Environment, Harbin Institute of Technology, Harbin 150090, China.
Abstract:
Biofouling and microbial penetration are still the important issues for surface water purification during gravity-driven microfiltration process, where biofouling has the tendency to deteriorate microbial rejection efficiency. Herein, ultra-thin antimicrobial layer composed of ε-poly-l-Lysine (EPL) and tannic acid (TA) biomacromolecules was successfully chemically crosslinked onto polyvinylidene fluoride (PVDF) membrane via covalent bond-involved layer-by-layer (LbL) method. As-prepared PVDF@EPL membrane could kill bacteria through the contact sterilization effect of AMP. Besides, PVDF@EPL membrane rapidly raised the intracellular ROS (Reactive Oxygen Species) level of bacteria and caused oxidative damage. Accompanying, hydrogen peroxide was in-situ generated on PVDF@EPL membrane surface at the presence of dissolved oxygen, which was also related to sterilization effect. In addition, the biofouling resistance ability was further enhanced by the hydrophilicity of PVDF@EPL membrane. During microfiltration process of river water, PVDF@EPL membrane inhibited the adsorption and aggregation of bacterial cells on membrane surface and presented high stable permeate flux (114 % higher than commercial PVDF). More importantly, PVDF@EPL membrane achieved long-lasting > 99.99 % effluent disinfection efficiency. Chemical-crosslinking assembly of antimicrobial peptide and plant polyphenol offered an environmental-friendly and promising strategy for the construction of antibiofouling membrane surface in the field of gravity-driven membrane process.
