化工学报 ›› 2019, Vol. 70 ›› Issue (7): 2737-2747.DOI: 10.11949/0438-1157.20190176

• 材料化学工程与纳米技术 • 上一篇    下一篇

Al2O3和SiC微滤膜的疏水改性及其油固分离性能研究

李秀秀(),魏逸彬,谢子萱,漆虹()   

  1. 南京工业大学膜科学技术研究所,材料化学工程国家重点实验室,江苏 南京 210009
  • 收稿日期:2019-03-03 修回日期:2019-04-29 出版日期:2019-07-05 发布日期:2019-07-05
  • 通讯作者: 漆虹
  • 作者简介:李秀秀(1993—),女,硕士研究生,<email>862421611@qq.com</email>
  • 基金资助:
    国家自然基金项目(21490581);中国石油化工股份有限公司资助项目(317008-6)

Hydrophobic modification of Al2O3 and SiC microfiltration membranes for oil-solid separation

Xiuxiu LI(),Yibin WEI,Zixuan XIE,Hong QI()   

  1. Membrane Science and Technology Research Center, State Key Laboratory of Materials-Oriented Chemical Engineering, Nanjing Tech University, Nanjing 210009, Jiangsu, China
  • Received:2019-03-03 Revised:2019-04-29 Online:2019-07-05 Published:2019-07-05
  • Contact: Hong QI

摘要:

以正辛基三乙氧基硅烷和乙醇分别作为改性剂和溶剂,采用接枝聚合法对平均孔径为500 nm的Al2O3膜和SiC膜进行疏水改性,考察了改性剂浓度、改性液温度和改性时间对膜表面疏水效果的影响,并对比了疏水改性前后两种陶瓷膜的表面性质及疏水改性后的油固分离性能,进行了反冲实验和稳定性测试。结果表明,两种陶瓷膜材料在改性剂浓度为0.2 mol·L-1,改性液温度为40℃,改性时间为12 h时,疏水改性效果最好,得到的疏水Al2O3膜和SiC膜的水接触角分别为134°±1°和140°±1°,经改性后的SiC膜的疏水效果优于Al2O3膜。在油固分离实验中,疏水Al2O3膜和SiC膜均对固体炭黑有良好的截留性能,但疏水改性对SiC膜的油品通量提升更为显著,两种膜的稳态通量分别为1134 L·m-2·h-1和1408 L·m-2·h-1。反冲操作对疏水SiC膜的通量恢复更有利。

关键词: 陶瓷膜, 碳化硅, 油固分离, 疏水改性

Abstract:

The Al2O3 film and the SiC film with an average pore diameter of 500 nm were hydrophobically modified by n-octyltriethoxysilane and ethanol as modifiers and solvents, respectively. The concentration and modification of the modifer were investigated by graft polymerization. The wettability and oil-solid separation performance of the modified Al2O3 and SiC MF membranes were investigated. The backflushing operation and long-term stability test for the modified membranes were conducted. Under the optimal modification conditions with grafting agent concentration of 0.2 mol·L-1, grafting temperature of 40℃ and grafting time of 12 h,the water contact angles (WCAs) of the modified Al2O3 and SiC membranes were as high as 134°±1°and 140°±1°, respectively. It was found that the hydrophobic SiC membrane showed higher hydrophobicity than that of the Al2O3 membrane. For oil-solid separation experiments, both modified membranes exhibited excellent rejection to impurities in oil phase. However, the hydrophobic modification had a more significant effect on the flux of SiC membrane. The fluxes of hydrophobic Al2O3 and SiC MF membranes were 1134 L·m-2·h-1 and 1408 L·m-2·h-1, respectively, with transmembrane pressure of 0.25 MPa. Backflushing operation was beneficial to the flux recovery of ceramic membrane, especially hydrophobic SiC membrane.

Key words: ceramic membrane, SiC, oil-solid separation, hydrophobic modification

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