摘要
以聚乙二醇(PEG-400)为还原剂,Ag NO3为前驱体,采用浸渍-还原法合成氧化石墨烯-Ag纳米粒子(GO-Ag NP)复合物,再通过共混法制备氧化石墨烯-Ag纳米粒子/聚酰亚胺(GO-Ag NP/PI)混合基质膜,用于苯/环己烷混合物的渗透汽化分离。使用透射电子显微镜、红外吸收光谱、拉曼光谱、热失重以及X射线光电子能谱等分析表征GO-Ag NP复合物、GO-Ag NP/PI混合基质膜的形貌和结构;探讨了Ag掺杂量对GO-Ag NP复合物的结构以及GO-Ag NP/PI混合基质膜的结构和渗透汽化性能的影响。结果发现,Ag+被还原形成Ag NP的同时,GO失去了部分含氧官能团;Ag掺杂破坏了GO的结构,使其无序度增加,但改善了GO-Ag NP复合物在混合基质膜中的分散性,提升了GO-Ag NP/PI混合基质膜的苯/环己烷渗透汽化性能。然而过量的Ag掺杂将使GO片层上产生Ag粒子团聚,从而降低混合基质膜的渗透汽化性能。当Ag掺杂量为15%时,GO-Ag NP/PI混合基质膜渗透汽化性能最佳,渗透通量为1 404 g·m-2·h-1,分离因子可达36.2。
Graphene oxide-Ag nanoparticle（GO-AgNP） composites were synthesized by impregnation-reduction method using polyethylene glycol （PEG-400） as the reducer and AgNO3 as the source of AgNP, which were then blended with polyimide（PI） to prepare GO-AgNP/PI mixed matrix membranes. The structure of GO-AgNP composites and GO-AgNP/PI mixed matrix membranes were characterized by Transmission electron microscopy（TEM）, Fourier transform infrared spectroscopy（FT-IR）, Raman spectroscopy, Thermo-gravimetric analysis（TGA）, X-ray photoelectron spectroscopy（XPS）. The effect of AgNP-doping on pervaporation property of GO-AgNP/PI mixed matrix membranes was investigated for separation of benzene/cyclohexane mixture. The results reveal that the dope of AgNP would slightly destroyed the structure of GO, and the disorder degree of GO structure increased, the oxygen-containing functional groups of GO decreased in Ag reduced to form AgNP. But the dope of AgNP which was helpful to improve the dispersion of AgNP-GO composite in the mixed matrix membrane, thus enhance the pervaporation performance of the mixed matrix membrane. However, the excess of AgNP-doping would lead to the aggregation of Ag particles on the GO surface, which depressed the pervaporation performance of the mixed matrix membrane. When AgNP-doping reached 15% in GO-AgNP composite, the mixed matrix membrane demonstrates good pervaporation perporty, and the separation factor reached 36.2 and the flux is 1404 gm-2h-1.
出处
《无机化学学报》
SCIE
CAS
CSCD
北大核心
2016年第8期1345-1352,共8页
Chinese Journal of Inorganic Chemistry
基金
国家自然科学基金(No.21376218
21076190)资助项目
