有机-无机杂化抗菌微滤膜的制备及性能研究

Preparation and Properties of Organic - inorganic Hybrid Antibacterial Microfiltration Membrane

摘要:

采用氨基硅烷偶联剂对氧化石墨烯（GO）进行改性，通过吸附、还原法负载纳米银，制得载银改性氧化石墨烯（Ag@ mGO），然后将其与聚乙烯醇（PVA）共混，经非溶剂致相分离（NIPS）法制得有机-无机杂化微滤膜（M1～M5）。对Ag@ mGO及M1～M5进行了FTIR、XRD、TEM、SEM、接触角、孔隙率及平均孔径等结构表征，同时也对M1～M5的抗菌性能、过滤性能及耐污染性能进行了测试。结果表明，Ag @mGO粒径在10 nm以下，载银摩尔分数为5.45%；M1～M5的接触角最小可达23.3°，孔隙率（ε）为30%~40%，平均孔径 (rm)为0.54~0.71μm，具有较好的亲水性和优异的过滤性能。同时，M1～M5对牛血清蛋白（BSA）的截留率（R）在80.2 %以上，对大肠杆菌(K12)的抑菌圈直径在1.29 cm以上，说明制备的杂化微滤膜M2～M5具有良好的耐BSA污染和抗菌性能。

Abstract:

In this paper, graphene oxide (GO) was firstly modified by aminosilane coupling agent, and nano silver was loaded by adsorption and reduction. Then, organic-inorganic hybrid microfiltration membrane was prepared with modified GO and hydrophilic polymer such as polyvinyl alcohol (PVA) through the nonsolvent induce phase separation (NIPS) method. The structure of the prepared Ag@mGO and the hybrid membranes were characterized and identified by FTIR, XRD, TEM, SEM, Contact Angle (CA), Porosity (ε) and MeanPore Size (rm).The antibacterial property, filtration performance and antifouling ability of the hybrid membranes were characterized meanwhile bycorresponding measurements.The results show that the Ag@mGO particle size is below 10 nm and the silver loading is 5.45%. The porosity (ε) is 30% ~ 40% and the average pore size (rm) is 0.54 ~ 0.71 μm, which means good hydrophilicity and excellent filtration performance. At the same time, the rejection rate (R) for BSA was above 80.2%, and the diameter of the inhibition zone for E. coli (K12) was above 1.29 cm, which indicated that the prepared hybrid microfiltration membranes also had good resistance to BSA pollution and antibacterial efficacy.