F-Si-PCPA-PVDF超疏水膜的制备及其膜蒸馏性能研究

doi:10.19964/j.issn.1006-4990.2025-0111

Abstract

Abstract:

Membrane distillation technology has broad application prospects in the field of water treatment.However，in the long-term treatment of complex systems containing multiple pollutants，it is difficult for conventional membranes to avoid membrane fouling and wetting.In order to improve the membrane distillation performance of hydrophobic polyvinylidene fluoride（PVDF） membrane，the superhydrophobic modified membrane of F-Si-PCPA-PVDF was prepared by mussel-inspired coating（PCPA） assisting loading of fluorinated silica（F-SiO₂） nanoparticles.The morphology，chemical composition and wetting properties of the modified membrane were characterized，and its membrane distillation performance was investigated by direct contact membrane distillation（DCMD） device.The results demonstrated that the F-Si-PCPA-PVDF membrane exhibited superior hydrophobicity with a high water contact angle of（168.8±0.6）° and low water sliding angle of 2.8°，along with exceptional anti-fouling and anti-wetting capabilities in simulated seawater systems containing typical contaminants such as calcium carbonate（CaCO₃），humic acid（HA），mineral oil（MO），and sodium dodecyl sulfate（SDS）.In the system containing 0.05 mmol/L SDS，the flux of PVDF membranes was declined by 24.27% during the 8 h membrane distillation process.In contrast，the modified membrane maintained a stable flux of （26.97±0.49） kg/（m²·h） while sustaining salt rejection rates above 99.99% throughout the process.

Key words: membrane distillation, superhydrophobic, coating modification, mussel-inspired coating

CLC Number:

TQ051.893

MA Quan, MENG Xin, JIN Yang, LI Jun, WANG Wen. Study on preparation of F-Si-PCPA-PVDF superhydrophobic membrane and its membrane distillation performance[J]. Inorganic Chemicals Industry, 2026, 58(2): 28-35.

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改性前后SiO₂	原子数分数/%
改性前后SiO₂	Si 2p	O 1s	C 1s	F 1s
SiO₂	36.80	62.02	1.18	0
F-SiO₂	27.73	43.90	15.01	13.36

膜	原子数分数/%
膜	C 1s	F 1s	O 1s	N 1s	Si 2p
PVDF	53.52	46.48
PCPA-PVDF	60.86	11.60	16.32	11.22
F-Si-PCPA-PVDF	20.96	16.08	38.32		24.64

膜	粗糙度/nm
膜	R_a	R_q	R_max
PVDF	267±65	331±68	2 015±245
F-Si-PCPA-PVDF	343±37	433±50	3 086±449

National Inorganic Salts Information Center

Inorganic Acid-Base-Salt Committee of CIESC

Study on preparation of F-Si-PCPA-PVDF superhydrophobic membrane and its membrane distillation performance

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膜	LEP/MPa
PVDF	0.114±0.002
F-Si-PCPA-PVDF	0.145±0.001