载Ag活性碳纤维的制备及其杀菌性能评价

摘要

The activated carbon fiber(ACF)was modified firstly by soaked method,then nano Ag particles-loaded ACF (ACF-nano AgP )was obtained by hydrothermal synthesis method with sugar as the reducer and torpent.Then ACF-nano AgP was used for the study of sterilization for drinking water.The Surface properties,Zeta potential, EDS and XRD tests show that the different amount and morphology of nano AgP is loaded on the different modified ACF.The modified ACF by soaking with KMnO4 (0.4 mol L-1 ),NH 3·H 2 O(3 mol L-1 )and HNO3 (65%-85%) respectively for 24 h show a relatively better nano AgP loading behavior.These three kinds of modified ACF-nano AgP present good antimicrobial performance for both Staphylococcus aureus (S.aureus)and Escherichia coli (E.co-li).And 100% of sterilizing rate for drinking water presents by using ACF-nano AgP modified with HNO3 within 2 h.When ACF-nano AgP modified by HNO3 and NH 3·H 2 O as the electrode,more than 97% of sterilizing rate for drinking water is achieved only in 10 min.With the reutilization of ACF-nano AgP ,microbial residues adhere to the surface of electrode porosity gradually,resulting in a reduction of sterilization efficiency.A small amount of leaked Ag can be completely recovered to the ACF-nano AgP by everse the connection of the battery power terminals.This method can effectively restrain the loss of nano AgP to prevent the potential toxicity and ensure the safety of the drinking water.%采用浸渍法对活性碳纤维(Activated Carbon Fiber,ACF)改性,以糖类物质同时作为还原剂和保护剂,通过水热反应在改性ACF上原位生长纳米Ag颗粒(nano AgP),得到载纳米银ACF(ACF-nano AgP),将其用于饮用水杀菌研究.表面特性、Zeta电位、EDS和XRD等测试表明,不同改性ACF表面生成了数量和形貌各异的单质Ag颗粒.分别通过KMnO4(0.4 mol·L-1)、NH 3·H 2 O(3 mol·L-1)和HNO3(65%~85%)浸渍24 h后获得的改性ACF具有更优的载nano AgP性能,三种改性的ACF-nano AgP均对大肠杆菌和金黄色葡萄球菌具有不同程度的抑制和杀灭作用,经HNO3改性后的ACF-nano AgP在2 h内对饮用水杀菌率达到100%.将HNO3、NH 3·H 2 O改性后的ACF-nano AgP作为电极材料,10 min对饮用水杀菌率超过97%.但是,随着ACF-nano AgP使用次数的增加,微生物残体逐渐附着于电极孔隙表面,导致其杀菌效率有所降低.通过反向接电可实现对少量流失nano AgP的100%回收,有效解决了nano AgP流失的潜在危害,确保饮用水质安全.