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Preparation and anti-fouling performance study of SA-modified CS/PVDF blended membranes |
| Authors： LI Qianqian1,FANG Ping1, WEN Lu2， HU Zhangfan1,YANG Sen1, LI Xilong1, ZHOU Yuxiang1 |
| Units： 1. School of Urban Planning and Municipal Engineering， Xi’an Polytechnic University， Xi’an 710048， China； 2. Technical Monitoring General Station of Zhongyuan Oilfield Branch Company， Xi’an 710048， China |
| KeyWords： polyvinylidene fluoride; modified membrane; chitosan; sodium algin； anti-fouling performance |
| ClassificationCode：TQ051.893 |
| year,volume(issue):pagination： 2025,45(3):99-106 |
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Abstract： |
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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. |
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Funds： |
| 陕西省重点研发计划项目（2024SF-YBXM-573）； 西安市科技计划项目（23GXFW0023） |
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AuthorIntro： |
| 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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Reference： |
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