膜科学与技术

基于油水分离的氧化石墨烯/二氧化硅复合膜的制备与性能研究

作者：袁茹欣，陈文革，栗雯绮，李拥璇

单位：西安理工大学材料科学与工程学院，陕西西安 710048

关键词：氧化石墨烯；油水分离；层状结构；复合膜

出版年,卷(期):页码： 2022,42(3):97-105

摘要：

为了提升纯氧化石墨烯膜的油水分离性能，以氧化石墨烯（GO）粉末为原料，微米二氧化硅（SiO2）粉末为改性添加剂，乙二胺（EDA）为交联剂，纤维素微孔滤膜为基底膜，采用真空抽滤技术制备了氧化石墨烯二氧化硅（GO/SiO2）复合薄膜用于油水分离，采用SEM、XRD和AFM分别分析了GO/SiO2复合薄膜的微观形貌、物相组成和表面粗糙度，研究了改变添加剂的含量对GO/SiO2复合薄膜亲水性能、渗透通量、油水乳液分离性能以及循环使用性能的影响。结果显示，SiO2颗粒插入GO纳米片层之间，EDA联结相邻的GO纳米片，形成多孔纳米通道，复合薄膜GO/SiO2的质量比为1:2时，性能最佳，纯水渗透通量可达839 L?m-2?h-1，平均接触角55.42?，不同种类的油水乳液截留率达到99.4 %。循环试验表明，在6次循环后仍能保持99.6 %的高截留率。

In order to improve the oil/water separation performance of graphene oxide(GO) membrane, GO/SiO2 composite membrane were obtained by assembling graphene oxide nanosheets with silicon oxide (SiO2) as a modified additive, cellulose microporous filter membrane as the base membrane and using ethylenediamine to crosslink them with the assistance of vacuum filtration, for oil/water separation. The microstructures, crystal structures and roughness of GO/SiO2 composite membrane were investigated by scanning electron microscopy(SEM), X-ray diffraction(XRD) and atomic force microscopy(AFM), respectively. The properties of the hydrophilic, permeability flux, oil/water emulsion separation and recycling uses of GO/SiO2 composite membrane were studied by changing the content of additives. The results show that the GO/SiO2 composite membrane has the optimal performance when the quality ratio of GO and SiO2 is 1:2. SiO2 particles were embedded between the GO nanosheets, with EDA molecules anchored between the adjacent GO nanosheets, forming microporous nanostructures. The pure water flux of composite membrane reached 839 L?m-2?h-1, and the average contact angle reached 55.42°, and the rejection ratio reached 99.4% in different types of oil/water emulsion. The composite membrane maintained the high rejection ratio which was more than 99.6% after six cycles tests.

袁茹欣（1997— ），女，硕士，研究方向为氧化石墨烯在污水处理中的应用

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