氯化锂共混改性对PVDF超滤膜耐氯性的影响

罗秦格; 李航哲; 李凯; 文刚; 黄廷林

doi:10.13205/j.hjgc.202409014

氯化锂共混改性对PVDF超滤膜耐氯性的影响

doi: 10.13205/j.hjgc.202409014

罗秦格^1,2,3,
李航哲⁴,
李凯^1,2,3, ,,
文刚^1,2,3,
黄廷林^1,2,3

1. 西安建筑科技大学陕西省水污染控制与水质安全保障协同创作中心, 西安 710055;
2. 西安建筑科技大学陕西省环境工程重点实验室, 西安 710055;
3. 西安建筑科技大学西北水资源与环境生态教育部重点实验室, 西安 710055;
4. 西安建筑科技大学未来技术学院, 西安 710055

基金项目:

陕西省重点科技创新团队项目“饮用水水质安全保障”(2023-CX-TD-32)

陕西省自然科学基金项目“接枝改性强化PVDF超滤膜耐老化性的效能与机理研究”(2023-JC-YB-448)

详细信息

作者简介:
罗秦格(1994-),女,硕士,主要研究方向为膜法水处理技术。18240890118@163.com

通讯作者:
李凯(1987-),男,教授,主要研究方向为膜法水处理技术。likai@xauat.edu.cn

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出版历程
- 收稿日期: 2024-04-20
- 网络出版日期: 2024-12-02

EFFECT OF LITHIUM CHLORIDE BLENDING ON CHLORINE RESISTANCE OF PVDF ULTRAFILTRATION MEMBRANE

LUO Qinge^1,2,3,
LI Hangzhe⁴,
LI Kai^{1,2,3
, ,},
WEN Gang^1,2,3,
HUANG Tinglin^1,2,3

1. Collaborative Innovation Center of Water Pollution Control and Water Quality Security Assurance of Shaanxi Province, Xi'an University of Architecture and Technology, Xi'an 710055, China;
2. Shaanxi Key Laboratory of Environmental Engineering, Xi'an University of Architecture and Technology, Xi'an 710055, China;
3. Key Laboratory of Northwest Water Resource, Environment and Ecology, MOE, Xi'an University of Architecture and Technology, Xi'an 710055, China;
4. School of Future Technology, Xi'an University of Architecture and Technology, Xi'an 710055, China

摘要

摘要: 为考察氯化锂(LiCl)共混改性对聚偏氟乙烯(PVDF)超滤膜耐氯性的影响,采用聚乙烯吡咯烷酮(PVP)作为致孔剂和亲水改性剂,通过非溶剂致相分离法制备了PVDF和PVDF/LiCl膜,考察了次氯酸钠(NaClO)静态加速老化前后2种膜性质和性能的变化。结果表明:添加LiCl使得相转化成膜过程中更多的PVP保留在膜上,且增加了PVDF的极性β相比例,使 PVDF/LiCl膜的亲水性增强,孔隙率增加;NaClO老化造成PVP氧化流失和膜亲水性降低,采用牛血清蛋白作为模型有机物的过滤实验表明,NaClO老化使PVDF和PVDF/LiCl膜的污染阻力分别增加88%和49%,PVDF/LiCl膜抗污染性能下降幅度明显小于PVDF膜。总体而言,LiCl共混改性减缓了NaClO造成的PVDF膜性质的变化,提升了PVDF膜的耐氯性。
- PVDF超滤膜 /
- 耐氯性 /
- 氯化锂 /
- 共混改性 /
- 抗有机污染
Abstract: To investigate the effect of lithium chloride (LiCl) blending on chlorine resistance of polyvinylidene fluoride (PVDF) ultrafiltration membrane, PVDF and PVDF/LiCl membranes were prepared by non-solvent induced phase separation method using polyvinylpyrrolidone (PVP) as the pore-forming agent and hydrophilic additive. The changes in membrane properties and performance due to static accelerated sodium hypochlorite (NaClO) aging were investigated. The results showed that the addition of LiCl enabled more PVP to remain on the membrane during the phase conversion process, and increased the proportion of polar β PVDF. Therefore, the hydrophilicity and porosity of the PVDF/LiCl membrane were higher than those of the PVDF membrane. NaClO aging resulted in oxidation and dislodgement of PVP and a decrease in membrane hydrophilicity. Filtration experiments using bovine serum protein as a model organic foulant showed that NaClO aging increased the fouling resistance of PVDF and PVDF/LiCl membranes by 88% and 49%, respectively. The deterioration of fouling resistance of PVDF/LiCl membrane, due to NaClO aging, was significantly lower than that of PVDF membrane. In general, LiCl blending can improve the chlorine resistance of PVDF membranes by alleviating the change of membrane properties, due to NaClO aging.
- PVDF ultrafiltration membrane /
- chlorine resistance /
- lithium chloride /
- blending modification /
- organic fouling resistance

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参考文献(38)

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