ZHANGHao-quan,CHENGYan-jun,QIUShu-ning,et al.Preparation of PVDF/BTO Piezoelectric Ultrafiltration Membrane and Its Antifouling Mechanism[J].China Water & Wastewater,2024,40(11):73-80.
PVDF/BTO压电超滤膜制备及其抗污染机理
- Title:
- Preparation of PVDF/BTO Piezoelectric Ultrafiltration Membrane and Its Antifouling Mechanism
- 摘要:
- 针对聚偏氟乙烯（PVDF）超滤膜污染问题，以钛酸钡（BTO）纳米压电颗粒作为添加剂，通过共混改性制备了PVDF/BTO压电超滤膜，并分析了BTO对膜材料压电输出、晶体含量、表面特性、孔径结构以及过滤、抗污染性能的影响。结果表明，BTO含量为0.1%的PVDF超滤膜在0.15 MPa下具有-3.99 V的压电输出，其极性晶型含量增加至90.19%，膜表面负电位提升至-53 mV，接触角降至43°，减少了大孔的形成，对于牛血清白蛋白（BSA）的截留率提升至77.4%，纯水通量略微下降至453.5 L/（m2·h）。此外，BSA污染实验表明，PVDF/BTO膜材料的压电效应能够对压力驱动膜过程实现响应，从而增强对污染物的静电排斥作用，减缓膜污染，即在一定过滤压力范围内（0.05~0.15 MPa），其污染阻力并未随过滤压力的增加而升高。相比于未改性膜，其不可逆污染阻力降低了20.17%（0.15 MPa），表现出优异的抗污染性能。
- Abstract:
- This paper prepared polyvinylidene fluoride/barium titanate (PVDF/BTO) ultrafiltration membrane by incorporating BTO nano-piezoelectric particles as additive, and analyzed the impact of BTO on the piezoelectric output, crystal content, surface characteristics, pore size structure, filtration efficiency and anti?fouling performance of the membrane, so as to address the fouling issue of PVDF ultrafiltration membranes. The PVDF ultrafiltration membrane loaded with 0.1% BTO exhibited a piezoelectric output of -3.99 V at 0.15 MPa, accompanied by an increase in polar crystal content to 90.19%, an increase in membrane surface charge to -53 mV and a decrease in contact angle to 43°, thereby reducing the formation of macropores. As a result, the rejection rate for bovine serum albumin (BSA) increased to 77.4%, while the pure water flux experienced a slight decrease to 453.5 L/(m2·h). Furthermore, the BSA fouling experiment demonstrated that the piezoelectric effect of PVDF/BTO membrane material could effectively respond to the pressure-driven membrane process, thereby enhancing electrostatic repulsion of pollutants and mitigating membrane fouling. Specifically, its fouling resistance did not increase with higher filtration pressure within a certain transmembrane pressure range (0.05-0.15 MPa). Its irreversible fouling resistance was reduced by 20.17% (0.15 MPa) in comparison with the unmodified membrane, demonstrating outstanding anti?fouling performance.
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