Innovative PVDF@PFTES mixed matrix membranes for improved desalination via vacuum membrane distillation

IF 3.8 3区工程技术 Q3 ENERGY & FUELS

Chemical Engineering and Processing - Process Intensification Pub Date : 2025-04-30 DOI:10.1016/j.cep.2025.110346

Samraa R. Khaleel , Salah S. Ibrahim , Dahiru U. Lawal , Qusay F. Alsalhy

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Abstract

This study investigates the preparation and performance evaluation of flat sheet polyvinylidene fluoride (PVDF) membranes, fabricated via the phase inversion method. Varying amounts of powdered activated carbon (CNM/PAC) comprising high hydrophobic carbon nanomaterials (0.1, 0.2, 0.3, 0.4, and 0.5 wt. %) are incorporated into the polymeric matrix, and then, modified by dip coating in a solution of 1H, 1H, 2H, 2HPerfluorodecyltriethoxysilane (PFTES)/hexane at varying concentration. The modified membranes were systematically assessed for their performance in vacuum membrane distillation (VMD), focusing on key metrics such as permeate flux, gain output ratio (GOR). Results disclosed that the chemically modified membrane 0.4 % CNM/PAC/PVDF with 2 % PFTES (2 %FM4) had superior stability compared to the unmodified membranes, demonstrating a higher water contact angle of 124° and a permeate flux of 16.61 L/m².h. Moreover, the salt rejection remained consistent at 99.9 % over prolonged operation of 96 hours, using simulated seawater. The GOR value displayed around 44 % increment at optimum operating condition (65°C feed temperature, 0.6 L/min feed flowrate and 21kPa(abs) vacuum pressure), imparting an enhancement in the thermal efficiency.

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创新PVDF@PFTES混合基质膜，通过真空膜蒸馏改善海水淡化

研究了相转化法制备的聚偏氟乙烯（PVDF）平板膜的制备及其性能评价。将含有高疏水性碳纳米材料（0.1、0.2、0.3、0.4和0.5 wt. %）的不同数量的粉状活性炭（CNM/PAC）掺入聚合物基体中，然后在1H、1H、2H、2h全氟癸基三乙氧基硅烷(PFTES)/己烷不同浓度的溶液中浸涂改性。对改性膜在真空膜蒸馏（VMD）中的性能进行了系统评价，重点考察了渗透通量、增益输出比（GOR）等关键指标。结果表明，化学改性后的膜（0.4% CNM/PAC/PVDF, 2% PFTES (2% FM4)）的稳定性优于未改性膜，其水接触角为124°，渗透通量为16.61 L/m².h。此外，在模拟海水中，在96小时的长时间运行中，盐的截留率保持在99.9%。在最佳运行条件下（进料温度65°C，进料流量0.6 L/min，真空压力21kPa）， GOR值增加约44%，热效率得到提高。

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来源期刊

Chemical Engineering and Processing - Process Intensification 工程技术-工程：化工

CiteScore

7.80

自引率

9.30%

发文量

408

审稿时长

49 days

期刊介绍： Chemical Engineering and Processing: Process Intensification is intended for practicing researchers in industry and academia, working in the field of Process Engineering and related to the subject of Process Intensification.Articles published in the Journal demonstrate how novel discoveries, developments and theories in the field of Process Engineering and in particular Process Intensification may be used for analysis and design of innovative equipment and processing methods with substantially improved sustainability, efficiency and environmental performance.