化工进展 ›› 2018, Vol. 37 ›› Issue (10): 3744-3750.DOI: 10.16085/j.issn.1000-6613.2018-0263

• 化工过程与装备 • 上一篇    下一篇

超亲水/水下超疏油膜的制备及油水分离性能

曹思静, 潘子鹤, 杜志平, 程芳琴   

  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
  • 收稿日期:2018-01-31 修回日期:2018-04-04 出版日期:2018-10-05 发布日期:2018-10-05
  • 通讯作者: 杜志平,教授,博士生导师,研究方向为胶体界面化学。
  • 作者简介:曹思静(1993-),女,硕士研究生,研究方向为特殊浸润性油水分离材料的开发。
  • 基金资助:
    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。

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

CAO Sijing, PAN Zihe, DU Zhiping, CHENG Fangqin   

  1. 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
  • Received:2018-01-31 Revised:2018-04-04 Online:2018-10-05 Published:2018-10-05

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TiO2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TiO2/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TiO2/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/(m2·h)。经过30次连续油水分离后,其分离效率仍大于99.5%,表明TiO2/PVP-SS (stainless steel)膜有良好的耐久性和稳定性。因此,TiO2/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。

关键词: 膜, 超亲水/水下超疏油, 纳米结构, 黏度, 油水分离

Abstract: 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.

Key words: membranes, superhydrophilic/underwater superoleophobic, nanostructure, viscosity, oil-water separation

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