超亲水/水下超疏油膜的制备及油水分离性能  

Fabrication of superhydrophilic/underwater superoleophobic mesh for oil-water separation

作　　者：曹思静 潘子鹤 杜志平 程芳琴 CAO Sijing;PAN Zihe;DU Zhiping;CHENG Fangqin(Institute of Resources and Environment Engineering,Shanxi University,Shanxi Collaborative Innovation Center of High Value-added Utilization of Coal-related Wastes,State Environmental Protection Key Laboratory of Efficient Utilization Technology of Coal Waste Resources,Taiyuan 030006,Shanxi,China)

机构地区：[1]山西大学资源与环境工程研究所,低附加值煤基资源高值利用协同创新中心,国家环境保护煤炭废弃物资源化高效利用技术重点实验室,山西太原030006

出　　处：《化工进展》2018年第10期3744-3750,共7页Chemical Industry and Engineering Progress

基　　金：NSFC-山西煤基低碳联合基金重点项目(U1610222)及三晋学者计划专项项目。

摘　　要：工业生产和频繁的溢油事故产生大量的含油废水,其高效分离依然面临全球性的挑战。具有仿生浸润特性的膜可以选择性透过水或油,分离效率高且操作简单而广泛应用于油水分离。本文通过一步浸渍法将TiO_2纳米颗粒和聚乙烯吡咯烷酮(PVP)原位固化到不锈钢网上制备了具有微/纳米层级结构的超亲水/水下超疏油油水分离膜。重点考察了TiO_2/PVP涂覆液浓度(质量分数1%、3%、5%、7%、9%)对膜的浸润特性和油水分离性能的影响。实验结果表明,不同TiO_2/PVP浓度改性的膜具有超亲水/水下超疏油特性,水的接触角均为0°,在水中油的接触角达160°,油水分离效率大于99.5%。膜通量随浓度的增大先减小后增加,当质量分数为3%时膜通量最大为8422.5L/(m^2·h)。经过30次连续油水分离后,其分离效率仍大于99.5%,表明TiO_2/PVP-SS(stainlesssteel)膜有良好的耐久性和稳定性。因此,TiO_2/PVP-SS仿生特殊浸润膜材料在油水分离领域具有经济、高效、环境友好的潜在优势。The rapid development of industry activities and the frequently oil leakage accidents have produced large amount of oily wastewater and high efficient separation is still a worldwide challenge.Bio-inspired membranes with special wettability have highly selectivity on oil or water and have been extensively used for oil/water separation because of the advantages of easy operation,high efficiency.A one-step fabrication of micro/nano scale hierarchical structure superhydrophilic and underwater superoleophobic oil/water separation membrane was developed through impregnation of TiO2 nanoparticles and polyvinyl pyrrolidone(PVP)into stainless steel mesh.The effects of TiO2/PVP concentration on wetting properties and oil-water separation performances were investigated.The results indicated that water contact angle of the modified membrane was 0°,underwater oil contact angle was 160°,and the oil-water separation efficiency was above 99.5%under varied coating concentrations.The flux of these as-prepared membranes undergone a trend of going up and drop down,the maximum flux of 8422.5L/(m2·h)was reached at the TiO2/PVP concentration of 3%.The mesh still maintained separation efficiency above 99.5%after 30 separation cycles,indicating that the TiO2/PVP-SS(stainless steel)modified membrane has good durability and stability.Therefore,the TiO2/PVP modified bionic special wettability membrane has the potential advantages of economy,high efficiency and environmental friendliness in the oil-water separation.

关 键 词：膜 超亲水/水下超疏油 纳米结构 黏度 油水分离 

分 类 号：TB34[一般工业技术—材料科学与工程]