超亲水石墨烯/二氧化硅复合膜的制备优化和表征  

Preparation optimization and characterization of superhydrophilic graphene/silica composite membranes

作　　者：马智波 梁帅[1] 马广玉 任熠 李敏[1] MA Zhibo;LIANG Shuai;MA Guangyu;REN Yi;LI Min(Beijing Key Laboratory for Source Control Technology of Water Pollution,Beijing Forestry University,Beijing 100083,China;Environmental Development Center,Ministry of Ecology and Environment,Beijing 100029,China)

机构地区：[1]北京林业大学,水体污染源控制技术北京市重点实验室,北京100083 [2]生态环境部环境发展中心,北京100029

出　　处：《环境工程学报》2020年第7期1743-1751,共9页Chinese Journal of Environmental Engineering

基　　金：国家自然科学基金资助项目(51608038);北京市自然科学基金资助项目(8192030,L182026)。

摘　　要：膜表面亲水性是主导膜污染发生的关键因素,亲水膜的抗污染能力较强。基于氧化石墨烯(GO)和氨基修饰的纳米SiO2之间的自组装反应,分别通过真空抽滤、多巴胺辅助抽滤、热辅助法以及高温煅烧辅助抽滤法制备了多种GO/SiO2复合膜,结合纯水接触角测定、表面官能团分析以及电镜观察等,对制备方法和条件进行了优化。结果表明:高温煅烧法制备的超亲水GO/SiO2复合膜,其初始接触角为6.1°,并于2 s内,在膜表面实现完全铺展,表现出超亲水特性;此外,所制备的GO/SiO2超亲水膜的纯水通量分别是传统PVDF超滤膜、超亲水SiO2/PVDF复合膜和0.22μm有机商业膜的3.21、11.10和1.22倍,显示出良好的应用潜力。Membrane surface hydrophilicity is a key factor that dominates the occurrence and development of membrane fouling. A hydrophilic membrane normally performs better in antifouling. Based on the self-assembly reaction between graphene oxide(GO) and amine-terminated nano-SiO2, different kinds of GO/SiO2 membranes were prepared by the respective method of vacuum-induced filtration, dopamine-assisted vacuum filtration, heatinduced deposition, or high temperature calcination-assisted deposition. With systematic characterizations including contact angle measurement, surface functional group analyses and scanning electron microscope, the preparation methods and their corresponding conditions were compared and optimized. The superhydrophilic GO/SiO2 prepared by the calcination-assisted deposition method had the following characteristics: a low initial contact angle of 6.1°, a complete spreading on the membrane surface within 2 s, and an excellent superhydrophilic characteristic. In addition, the pure water flux of the GO/SiO2 membrane was 3.21, 11.10 and 1.22 times as much as that of the conventional PVDF membrane, superhydrophilic SiO2/PVDF composite membrane, or 0.22 μm commercial membrane, respectively, which presented promising applications in various fields.

关 键 词：超亲水膜 氧化石墨烯 SIO2 自组装 

分 类 号：X703[环境科学与工程—环境工程]