膜科学与技术

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Preparation and characterization of PVA-mCNT/PTFE hollow fiber
Janus membrane for membrane distillation

Authors： LIU Yi，LIU Xinyang，JIANG Lanying， JAAFAR Juhana

Units： 1.School of Metallurgy and Environment, Central South University, Changsha 410083,China； 2. National Center for the Control of Heavy Metal Pollution, Changsha 410083, China； 3. Faculty of Chemical and Energy Engineering, Universiti Teknologi Malaysia, Johor Bahru 81310, Malaysia; 4. Malaysian Centre for Advanced Membrane Technology and Research, Johor Bahru 81310, Malaysia

KeyWords： carbon nanotube; hollow fiber Janus membrane; membrane distillation; desalination; anti-oil fouling

ClassificationCode：号： TQ028； X703.1

year,volume(issue):pagination： 2025,45(5):51-65

Abstract：

Hollow fiber Janus membranes with polyvinyl alcohol (PVA) and carboxylated multi-walled carbon nanotubes (mCNTs) composite material as hydrophilic layer was fabricated via deposition of mCNT on the surface of poly tetrafluoroethylene (PTFE) hydrophobic membrane by vacuum filtration, followed with PVA coating and glutaraldehyde (GA) crosslinking. Regarding PVA-mCNT composite layer, scanning electron microscope (SEM) revealed that it was dense with a thickness of 70~80 μm and a rough outer surface; Fourier transform infrared spectrometer (FTIR) proved its chemical structure and occurrence of crosslinking; and contact angle indicated its hydrophilicity. In direct contact membrane distillation (DCMD) operation treating 3.5% (mass fraction) NaCl aqueous solution, PVA-mCNT/PTFE membrane had a average flux of 7.09 kg/(m2·h), which was slightly higher than those of PVA/PTFE composite membrane and PTFE substrate. All the membranes had an original desalination rate higher than 99.9%; in the latter half of the test, however, desalination rate of Janus membranes were reduced to be lower than that of PTFE substrate. In DCMD treating saline containing 500 μL/L soybean oil, PTFE substrate lost its flux on the 1st day after 4 h. Whereas, for PVA/PTFE and PVA-mCNT/PTFE composite membranes, their flux reached zero on the 2nd and 3rd day, respectively. All the flux reduction were accompanied with deteriorating desalination rate.

Funds：

国家自然科学基金重点项目(52534005); 湖南省教育厅重点项目（22A0003）

AuthorIntro：

刘忆（2000-），女，湖南常德人，硕士研究生，主要研究方向为膜蒸馏

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