应用功能化的金纳米通道分离阿特拉津和百草枯

Separation of Atrazine and Paraquat with Functionalized Gold Nanochannels

将金(Ⅰ)通过化学沉积法于4℃经9h使之沉积于聚碳酸酯滤膜(孔径100nm)的内孔壁上,从而制得金纳米通道膜。经清洗并干燥后的膜在十八烷基硫醇[CH3(CH2)16CH2SH](0.1+99.9)溶液中浸泡12h,从而使金纳米通道膜被十八烷基硫醇修饰(将此膜简写作C18SH-Mem)并使其呈疏水性。试验在分离装置的样品池中加入阿特拉津和百草枯两种农药的混合溶液,并使其通过C18H37SH-Mem,经过一定时间后,在膜另一端的检测池中对上述两农药分别在222nm及257nm波长处进行检测。结果表明:在检测池中只测得疏水性的阿特拉津而未能测得百草枯,说明亲水性的百草枯不能在疏水性的经修饰的金纳米通道中迁移。据此,应用修饰后的金纳米通道可达到上述两农药的完全分离。

Gold nanochannels were prepared by chemical deposition of Au（Ⅰ） onto inner porous wall of polycarbonate（PC） membrane（bore： 100 nm） at 4 ℃ for 9 h.The cleaned and dried membrane of gold nanochannels was then modified by soaking in octadecylthiol solution（0.1＋99.9） for 12 h,thus making the Au nanochannel membrane（designated as C18H37SH-Mem） hydrophobic.When a mixed solution of atrazine and paraquat was introduced into the sample cell of the separation device,and let it to pass through the C18H37SH-Mem.UV detections at 222 nm（for atrazine） and 257 nm（for paraquat） were made with the solution in the detection cell after a defirite time intervals.It was shown by the results that only the hydrophobic atrazine was found in the detection cell and no paraquat was found because it is hydrophilic.Based on this fact,atrazine and paraquat were separated satisfactorily by using the modified Au nanochannels.