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Study on preparation and seawater desalination performance of
biomass-based mixed hydrogel evaporation membrane

Authors： QIU Chunxia, WANG Siwen, XU Yuanlu, LIU Yu, FAN Xinfei, SONG Chengwen

Units： 1.Transport Planning and Research Institute Ministry of Transport, Beijing 100028,China; 2. School of Environmental Science and Engineering, Dalian Maritime University, Dalian 116026,China; 3. Guotou Caofeidian Port Co., Ltd., Tangshan 063200,China

KeyWords： biomass; solar interfacial evaporation; hydrogel; seawater desalination

ClassificationCode：TQ427.2+6；TK519

year,volume(issue):pagination： 2025,45(6):80-90

Abstract：

Due to the increasingly serious freshwater crisis caused by the continuous growth of the population, solar-driven interfacial evaporation, as a green, low-energy consumption and environmentally friendly seawater desalination technology, has become a research hotspot for achieving the increase of freshwater sources. In this study, based on a simple gelatinization-freeze-thaw process, biomass-based mixed hydrogel [octopus ink@ polyvinyl alcohol (PVA) hydrogel] solar evaporation membrane was prepared for efficient solar-driven interfacial evaporation. The physical properties such as the microscopic morphology, structural characteristics, wetting performance and photothermal performance of the evaporation membrane were systematically studied, and a comprehensive assessment of its application prospects in the field of seawater desalination was conducted. The research results showed that the superhydrophilicity and the porous water delivery channels formed by freeze-thaw cycling acted synergistically to ensure the excellent water supply capacity of the evaporation membrane. Under the standard solar radiation intensity, the evaporation rate could reach 2.49 kg/(m2·h）, and the corresponding photothermal conversion efficiency was approximately 86.58%. Furthermore, the prepared evaporation membrane demonstrated high salt tolerance. The evaporation rate could still reach 1.33 kg/(m2·h） in 15% brine concentration, and it had excellent self-cleaning ability. Moreover, it showed good desalination performance in outdoor seawater desalination experiments. The ion concentrations of Na+, K+, Mg2+ and Ca2+ in the collected condensate all met the drinking water standards of the World Health Organization, indicating that it has broad application prospects in the field of seawater desalination.

Funds：

国家重点研发计划项目（2023YFC3108300）

AuthorIntro：

邱春霞（1979-），女，辽宁东港人，硕士研究生，研究方向为油污水膜分离技术水处理.

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