四甲基氢氧化铵改性聚偏氟乙烯一步接枝聚苯乙烯磺酸油水分离膜的制备及性能

doi:10.11944/j.issn.1000-0518.2019.08.180370

摘要/Abstract

摘要：

利用四甲基氢氧化铵(TMAH)聚偏氟乙烯(PVDF)进行改性,以过氧化苯甲酰(BPO)为引发剂,将苯乙烯磺酸(SSA)接枝到改性的PVDF骨架上,制得聚偏氟乙烯接枝聚苯乙烯磺酸(PSSA-g-PVDF)油水分离膜。研究了TMAH质量分数对PSSA的接枝率和油水分离膜性能的影响,同时采用傅立叶变换红外光谱(FTIR)、扫描电子显微镜(SEM)和视频光学接触角测量仪测试了膜的结构和表面接触角。结果表明,TMAH使PVDF脱去部分氟化氢(HF)产生碳碳双键,硫元素均匀地分布在分离膜中。 PSSA的接枝率随着TMAH的质量分数增加而升高,分离膜的水通量随接枝率的升高先增加后降低。当TMAH质量分数为20%,分离膜的接触角在30 s内降低到37.2°,接枝率和水通量分别为22.1%、643.3 L/(m·h),截留率和水通量恢复率分别达到90.6%和93.7%,衰减率为7.1%。循环测试显示膜的水通量恢复率和油水通量恢复率均在90%以上。

关键词: 油水分离膜, 一步法, 四甲基氢氧化铵, 聚偏氟乙烯, 苯乙烯磺酸

Abstract:

Poly(styrene sulfonic acid)-graft-poly(vinylidene fluoride)(PSSA-g-PVDF) membrane was prepared via phase bulk modification with tetramethylammonium hydroxide(TMAH), grafting styrene sulfonic acid(SSA) onto PVDF with benzoyl peroxide(BPO) as an initiator. After that, the copolymer was casted into a flat membrane via immersion phase inversion. It was investigated that TMAH content has effect on grafting degree(GD) and the oil/water separation membrane performance of PSSA. At the same time, Fourier transform infrared spectrum(FTIR), scanning electron microscope(SEM) and video optical contact angle measuring test were adopted to measure the membrane structure and surface contact angle. The results showed that the partial HF was eliminated from PVDF by TMAH forming carbon double bonds and styrene sulfonic acid was grafted onto the modified PVDF skeletons. The GD of PSSA-g-PVDF membrane increased as more TMAH used. The optimized hydrophilicity of modified PVDF membrane was obtained with 20% of TMAH, when the GD of membrane was 22.1%. The contact angle of the separation membrane was reduced to 37.2° within 30 s. Water flux was 643.3 L/(m·h). Rejection rate was 90.6% and the water flux recovery rate was 93.7%. The attenuation rate was 7.1%. The cycle test showed that the water flux recovery rate and oil-water flux recovery rate of the membrane were both above 90%.

Key words: oil/water separation membrane, one-step, tetramethylammonium hydroxide, poly(vinylidene fluoride), styrene sulfonic acid

彭继华, 郭贵宝. 四甲基氢氧化铵改性聚偏氟乙烯一步接枝聚苯乙烯磺酸油水分离膜的制备及性能[J]. 应用化学, 2019, 36(8): 909-916.

PENG Jihua, GUO Guibao. Preparation and Properties of Oil/Water Separation Membranes Synthesized via One-Step Grafting Poly(styrene sulfonic acid) onto Poly(vinylidene fluoride) Modified by Tetramethylammonium Hydroxide[J]. Chinese Journal of Applied Chemistry, 2019, 36(8): 909-916.

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