纳米硫化铁改性纳滤膜的制备及抗菌性能

Preparation and antibacterial properties of nano-iron sulfide modified nanofiltration membrane

为了提高纳滤膜的抗菌性,以三氯化铁和二烯丙基二硫(DADS)为原材料,通过改进的溶剂热法合成具有抗菌能力的纳米硫化铁(nFeS).以聚砜超滤膜为基膜,将纳米硫化铁作为改性剂添加到水相哌嗪单体中,通过界面聚合制备出nFeS改性聚酰胺纳滤(NF)膜.系列表征证明nFeS成功制备并负载到聚酰胺纳滤膜选择层中.nFeS改性聚酰胺纳滤膜在0.4 MPa操作压力下的渗透通量为65.7 L/(m^(2)·h),对1 000 mg/L的Na_(2)SO_(4)截留率为94.8%;随着nFeS添加量的增加,nFeS改性纳滤膜的抗菌性能逐渐增强.在NF膜具有较好渗透分离性能的前提下,改性NF膜对革兰氏阳性菌的抑菌率达到57%,对革兰氏阴性菌的抑菌率达到41%;同时,nFeS改性NF膜还具有较好的抗污染性.

To improve the antimicrobial performance of nanofiltration(NF)membranes,nano iron sulfide(nFeS)with antibacterial ability was synthesized by the improved solvothermal method using ferric chloride and diallyl disulfide(DADS)as the raw materials.nFeS modified polyamide NF membrane was prepared by interfacial polymerization process with polysulfone ultrafiltration membrane as porous support membrane and nFeS as modify agent added to aqueous piperazine aqueous solution.Series characterization indicated that nFeS was successfully synthesized and embedded into the polyamide NF membrane selection layer.The permeation flux of nFeS modified polyamide NF membrane was 65.7 L/(m^(2)·h)at 0.4 MPa,and the rejection rate for 1000 mg/L Na_(2)SO_(4) was 94.8%.With the increase of nFeS concentration,the antibacterial properties of nFeS modified NF membrane were gradually enhanced.For the nFeS modified NF membrane prepared in this study,it showed relatively good permeation and separation properties,and the inhibition rate of modified NF membrane against Gram-positive bacteria achieved 57%and the inhibition rate against Gram-negative bacteria reached 41%.At the same time,nFeS modified NF membrane also shows good antifouling properties.