膜科学与技术

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Design and performance study of carbon-based solar
desalination composite membranes

Authors： GUO Yanyan1, SONG Chengyan1, SU Haijian2, LI Yuanxin1, MA Zhun1,3

Units： 1. College of Chemical and Biological Engineering, Shandong University of Science and Technology, Qingdao 266590, China; 2. China Tobacco Shandong Industrial Co.， Ltd., Qingdao 266100, China; 3. College of Chemical Engineering and Materials Science, Quanzhou Normal University, Quanzhou 362000, China

KeyWords： interfacial evaporation; seawater desalination; carbon-based materials; polyvinylidene fluoride composite membrane; photothermal conversion

ClassificationCode：TQ028

year,volume(issue):pagination： 2025,45(4):133-142

Abstract：

With the increasingly severe shortage of freshwater resources around the world, solar-driven interfacial evaporation technology has become a research hotspot in the field of seawater desalination due to its high efficiency and environmental friendliness. In this paper, the Janus structure design based on polyvinylidene fluoride (PVDF) membrane was proposed, and the composite photothermal membrane of polyvinylidene fluoride-carbon black-polydimethylsiloxane (PVDF-CB-PDMS) was prepared by chemical modification, vacuum filtration and coating process. The effects of the amount of carbon black (CB), the soaking time of PVDF membrane and the amount of polydimethylsiloxane (PDMS) on the evaporation rate were systematically investigated, and the optimal conditions were optimized by response surface analysis: the amount of carbon black was 0.51 g, the soaking time of #PVDF membrane was 19.7 min, and the amount of PDMS was 0.20 g. The predicted interfacial photothermal evaporation rate was 2.87 kg/(m2·h）, and the experimental value was 2.87 kg/(m2·h）, which were in high agreement. Microscopic characterization showed that the uniform dispersion of carbon black significantly enhanced the light absorption (>99%), while the PDMS hydrophobic layer effectively inhibited salt crystallization. This paper provides theoretical support for the development of low-cost and high-stability solar desalination membranes.

Funds：

山东省自然科学基金面上项目(ZR2020MB118)

AuthorIntro：

郭艳艳(1998-)，女，山东平度人，硕士研究生，研究方向为新型膜材料的开发与性能

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