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莫来石负载碳纳米管复合膜的制备及膜蒸馏性能研究

作者：武慧，孙春意，杨凤林，董应超

单位：工业生态与环境工程教育部重点实验室，大连理工大学环境学院，辽宁大连 116024

关键词：莫来石，陶瓷膜，碳纳米管，膜蒸馏，含盐废水

DOI号：

分类号： TQ028.8

出版年,卷(期):页码： 2021,41(5):35-42

摘要：

本研究首先制备了具有较高渗透性能及较好机械强度的晶须状莫来石陶瓷中空纤维膜载体，采用化学气相沉积的方法在其表面原位生长一层碳纳米管（CNTs）网络结构，制备得到超疏水莫来石-CNTs复合膜，其平均孔径为103 nm，氮气渗透性为125 m3/(m2·h·bar)，水接触角达到157°，液体浸润压力为0.113 MPa。然后进一步研究了不同含盐废水的直接接触膜蒸馏性能，结果表明，在温差为50 ℃，进料液流速为0.77 m/s的条件下，该复合膜在3.5 wt.%的模拟海水及7.0 wt.%的高盐废水处理中分别达到了13 L/(m2·h)和6-7 L/(m2·h)的稳定渗透通量且12 h实验后未发生较大衰减，盐截留率（99.9%）和渗透侧电导率（<3 μS/cm）也均保持稳定。这表明了莫来石-CNTs复合膜在膜蒸馏应用中具有好的盐截留能力和渗透通量。

In this work, whisker-structured mullite ceramic hollow fiber membrane supports were prepared sintered at 1500 ℃, featuring high permeability and good mechanical strength, and carbon nanotubes (CNTs) were in situ constructed on mullite substrate surface via chemical vapor deposition. The obtained superhydrophobic (water contact angle: 157°) mullite-CNTs composite membrane presented a good liquid entry pressure (0.113 MPa) while the average pore size and gas permeability were 103 nm and 125 m3/(m2·h·bar), respectively. Then, the direct contact membrane distillation performance for different saline wastewater was further studied. The results showed that mullite-CNTs composite membrane achieved stable permeate flux of 13 L/(m2·h) and 6-7 L/(m2·h) for 3.5 wt.% (simulated seawater) and 7.0 wt.% (high salinity wastewater), respectively, while salt rejection (99.9%) and permeate conductivity (<3 μS/cm) also were stable after 12 h. This result indicates that obtain composite membrane show good flux and salt rejection in membrane distillation.

基金项目：

国家重点研发专项(No. 2019YFA0705803)、兴辽英才项目(No. XLYC1807250)、国家自然科学基金(No. 21876020和No. 52070033)和企业横向课题(No.HX20190810)

作者简介：

武慧（1996-），女，硕士研究生，研究方向为陶瓷膜的制备及水处理应用，E-mail：wuhui0212@mail.dlut.edu.cn

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