膜科学与技术

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Preparation and membrane distillation performance of mullite supported CNTs composite membrane

Authors： WU Hui, SUN Chunyi, YANG Fenglin, DONG Yingchao

Units： Key Laboratory of Industrial Ecology and Environmental Engineering, School of Environmental Science and Technology, Dalian University of Technology, Dalian 116024, China

KeyWords： Mullite; Ceramic Membrane; Carbon Nanotube; Membrane Distillation; Saline Wastewaters

ClassificationCode：TQ028.8

year,volume(issue):pagination： 2021,41(5):35-42

Abstract：

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.

Funds：

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)

AuthorIntro：

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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