SA改性CS/PVDF共混膜的制备及其抗污染性能研究 |
作者:李芊芊1, 房平1, 温璐2, 胡张凡1, 杨森1, 李喜龙1, 周玉祥1 |
单位: 1. 西安工程大学 城市规划与市政工程学院, 西安 710048; 2. 中原油田分公司技术监测总站, 西安 710048 |
关键词: 聚偏氟乙烯; 改性膜; 壳聚糖; 海藻酸钠; 抗污染性 |
DOI号: 10.16159/j.cnki.issn1007-8924.2025.03.010 |
分类号: TQ051.893 |
出版年,卷(期):页码: 2025,45(3):99-106 |
摘要: |
聚偏氟乙烯(PVDF)由于其良好的化学性能被认为是废水处理的合适膜材料,但PVDF膜自身的疏水性,使膜的抗污染性能变差进而影响废水处理效果。将PVDF粉末、无水氯化锂(LiCl)、壳聚糖(CS)以及溶剂N,N二甲基乙酰胺(DMAc)以一定的比例共混,制备出CS/PVDF多孔膜,再将海藻酸钠(SA)附着在共混膜上,得到SA-CS/PVDF超滤膜,并考察了其抗污染性能。结果表明,涂覆质量分数0.5%SA的CS/PVDF膜性能最优,相较于只添加质量分数5%LiCl的PVDF膜,水通量提高了845.2 L/(m2·h)、牛血清蛋白(BSA)截留率提高了23.6个百分点、接触角下降了36.2%;不可逆污染率达到13.2%,比纯膜降低了31.9个百分点,可逆污染率为38.4%,比纯膜提升了9.5个百分点。说明改性CS/PVDF共混膜的亲水性提升,抗污染性能增强。 |
Polyvinylidene fluoride (PVDF) is considered a suitable membrane material for wastewater treatment due to its excellent chemical properties. However, the inherent hydrophobicity of the PVDF membrane deteriorates its anti-fouling performance, thereby affecting the wastewater treatment effect. In this experiment, PVDF powder, anhydrous lithium chloride (LiCl), chitosan (CS), and the solvent N,N-dimethylacetamide (DMAc) were blended in a certain proportion to prepare a CS/PVDF porous membrane. Then, sodium alginate (SA) was attached to the blended membrane to obtain an SA-CS/PVDF ultrafiltration membrane. The results showed that the CS/PVDF membrane coated with 0.5%(mass fraction) SA exhibited the best performance. Compared with the PVDF membrane with only 5%(mass fraction) LiCl added, the water flux increased by 845.2 L/(m2·h), the bovine serum albumin (BSA) rejection rate increased by 23.6 pp, the contact angle decreased by 36.2%, the irreversible fouling ratio (Rir) reached 13.2%, which was 31.9 pp lower than that of the pure membrane, and the reversible fouling ratio (Rr) was 38.4%, which was 9.5 pp higher than that of the pure membrane. This indicates that the hydrophilicity of the modified CS/PVDF blended membrane is improved, and its anti-fouling performance is enhanced. |
基金项目: |
陕西省重点研发计划项目(2024SF-YBXM-573); 西安市科技计划项目(23GXFW0023) |
作者简介: |
李芊芊(2000-),女,陕西咸阳人,硕士研究生,主要从事水处理膜材料与技术方面研究 |
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