有机-无机杂化抗菌微滤膜的制备及性能

Preparation and Properties of Organic-inorganic Hybrid Antibacterial Microfiltration Membranes

采用氨基硅烷偶联剂（KH-892）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@m GO）,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,M1为纯PVA微滤膜）。对Ag@m GO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@m GO粒径在10 nm以下,载银摩尔分数为5.45%;M2-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,M2-M5对牛血清蛋白（BSA）的截留率（R）在80%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。

Graphene oxide （GO） was firstly modified by aminosilane coupling agent （KH-892）, and then nano silver loaded modified GO （ Ag@ mGO） was obtained by adsorption and reduction. Finally Ag@ mGO mixed with polyvinyl alcohol （PVA） solution and organic-inorganic hybrid microfiltration membranes （M1 -M5 ） were obtained through nonsolvent induce phase separation （NIPS） method The prepared Ag@ mGO and hybrid membranes were characterized by FTIR, XRD, TEM, SEM, contact angle （CA）, porosity （ε）, mean pore size （rm ） and so on Meanwhile the antibacterial property, filtration performance and antifouling ability of these hybrid membranes were evaluated The results showed that the particle size of Ag@ mGO was below 10 nm and the molar fraction of silver loading on a modified GO was 5.45%. These hybrid microfihration membranes exhibited good hydrophilicity and excellent filtering performance The minimum contact angle of M2 N M5 could be up to 23.3 o. The porosity was 30% -40% and the mean pore size was in the range of 0.54 -0. 71 p^m. At the same time, the rejection rate （R） for BSA of M2 - M5 was above 80% and the diameter of inhibition zone for E. coli （K12） was above 1.29 cm,which indicated that the prepared hybrid microfiltration membranes had good resistance to BSA pollution and antibacterial efficacy.