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

LUO Qinge; LI Hangzhe; LI Kai; WEN Gang; HUANG Tinglin

doi:10.13205/j.hjgc.202409014

Volume 42 Issue 9

Sep. 2024

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LUO Qinge, LI Hangzhe, LI Kai, WEN Gang, HUANG Tinglin. EFFECT OF LITHIUM CHLORIDE BLENDING ON CHLORINE RESISTANCE OF PVDF ULTRAFILTRATION MEMBRANE[J]. ENVIRONMENTAL ENGINEERING , 2024, 42(9): 148-155. doi: 10.13205/j.hjgc.202409014

Citation:

LUO Qinge, LI Hangzhe, LI Kai, WEN Gang, HUANG Tinglin. EFFECT OF LITHIUM CHLORIDE BLENDING ON CHLORINE RESISTANCE OF PVDF ULTRAFILTRATION MEMBRANE[J]. ENVIRONMENTAL ENGINEERING , 2024, 42(9): 148-155. doi: 10.13205/j.hjgc.202409014

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

doi: 10.13205/j.hjgc.202409014

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

Received Date: 2024-04-20
Available Online: 2024-12-02

Abstract

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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References(38)

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