State Key Laboratory of Materials-Oriented Chemical Engineering, Jiangsu National Synergetic Innovation Center for Advanced Materials, Nanjing Tech University , Nanjing, 210009, People's Republic of China.
Department of Biotechnology, Faculty of Advanced Sciences and Technologies, University of Isfahan , Isfahan 73441-81746, Iran.
ACS Appl Mater Interfaces. 2017 Sep 6;9(35):30024-30034. doi: 10.1021/acsami.7b06646. Epub 2017 Aug 22.
Flux and antifouling properties of mixed matrix membranes (MMMs) are yet to attain satisfactory status. The objective of this study is to find a method for mitigating the biofouling of poly(ether sulfone) (PES) ultrafiltration membranes via blending of thermoexfoliated vermiculite (VMT). Flow cytometry analysis shows that the behaviors of Bacillus subtilis 168 as a Gram-positive bacterium and Escherichia coli DH5 alpha as a Gram-negative bacterium were different. Hence, cell property is a suspected contributory factor in biofilm formation. Accordingly, considering the local predominant bacterial strains, a regionally customized membrane could scientifically be an expert solution for biofouling mitigation. Fabricated composite membranes have shown a higher flux compared to control PES membrane. Among all composite membranes, the PES-VMT0.10 had the highest flux of 476.4 L/(m h) (LMH) before fouling, and the highest flux of 210.7 LMH after three cycles of usage. In addition, the rejection rate of the PES-VMT0.15 The bovine serum albumin (BSA) sample was >77%, while that of the PES-VMT0.10 was >84%. The results of the static BSA adsorption test and the bacterial attachment test indicated that the membranes with macro-roughness on their surface showed better antibiofouling resistance. The antifouling properties of the modified membranes were also improved, because of their optimal wettability. On one hand, the hydrophilicity of membranes caused damaging both Gram-positive and Gram-negative bacteria and bacteriocidal effect. On the other hand, BSA adsorption and bacterial attachment on the membrane surface were affected by pore diameter.
混合基质膜（MMM）的通量和抗污性能尚未达到令人满意的状态。本研究的目的是通过添加热剥离蛭石（VMT）来减轻聚醚砜（PES）超滤膜的生物污染。流式细胞术分析表明，枯草芽孢杆菌 168 作为革兰氏阳性菌和大肠杆菌 DH5 alpha 作为革兰氏阴性菌的行为不同。因此，细胞特性是生物膜形成的一个可疑促成因素。因此，考虑到当地主要的细菌菌株，区域性定制膜可以成为减轻生物污染的科学解决方案。与对照 PES 膜相比，制备的复合膜具有更高的通量。在所有复合膜中，PES-VMT0.10 在污染前具有最高的通量 476.4 L/（m h）（LMH），在使用三个循环后具有最高的通量 210.7 LMH。此外，PES-VMT0.15 的牛血清白蛋白（BSA）样品的截留率>77%，而 PES-VMT0.10 的截留率>84%。静态 BSA 吸附试验和细菌附着试验的结果表明，表面具有宏观粗糙度的膜具有更好的抗污性能。由于其最佳的润湿性，改性膜的抗污性能也得到了提高。一方面，膜的亲水性对革兰氏阳性菌和革兰氏阴性菌均有损伤作用，并具有杀菌作用。另一方面，BSA 在膜表面的吸附和细菌附着受到孔径的影响。
