A novel ZnO nanoparticle blended polyvinylidene fluoride membrane for anti-irreversible fouling
A novel ZnO nanoparticle blended polyvinylidene fluoride membrane for anti-irreversible fouling
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DOI：
10.1016/j.memsci.2011.12.040
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发表时间：
2012-03-15
影响因子：
9.5
通讯作者：
Huang, Xia
中科院分区：
文献类型：
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作者：
Liang, Shuai;Xiao, Kang;Huang, Xia
不可逆膜污染对过滤的长期运行是有害的。采用湿相分离法制备了一种新型的抗不可逆污染聚偏氟乙烯（PVDF）膜。将纳米ZnO以6.7%~ 26.7%（占PVDF重量的百分比）的不同用量作为添加剂掺入到膜基体中，对膜孔内表面进行改性。通过过滤实验、接触角测量、扫描电子显微镜（SEM）/能量色散X射线光谱仪（EDS）分析和力学性能测试对改性膜进行了表征。多循环过滤实验表明，改性PVDF膜具有显著的抗不可逆污染性能。所有改性膜在物理清洗后水通量恢复几乎达到100%，而原膜仅达到78%的恢复。这种促进作用可能与膜亲水性的增加有关。将纳米ZnO植入膜内表面（即，SEM/EDS测试结果表明，膜的抗不可逆污垢性能增强的主要原因可能是膜的孔壁结构。纳米ZnO的加入量为6.7%时，改性膜的透水性提高了近一倍，确定了纳米ZnO改性PVDF膜的最佳用量（在本研究的用量范围内）。此外，发现改性膜的机械强度增强，这也应该有利于过滤应用。(C)2011 Elsevier B. V.保留所有权利。
Irreversible membrane fouling is harmful for long-term operation of filtration. In this study, a novel anti-irreversible fouling polyvinylidene fluoride (PVDF) membrane was successfully fabricated using the wet phase separation methods. Nano-ZnO, with different dosages ranging from 6.7% to 26.7% (percentage of PVDF weight), was blended as an additive into the membrane matrix for the modification of the internal surfaces of membrane pores. A series of tests, such as filtration experiments, contact angle measurements, scanning electron microscope (SEM)/energy dispersive X-ray spectrometer (EDS) analyses and mechanical tests, were performed to characterize the modified membranes. The multi-cycle filtration experiments showed that the modified PVDF membranes demonstrated significant anti-irreversible fouling property. All the modified membranes achieved almost 100% water flux recovery after physical cleaning, whereas the raw membrane only reached 78% recovery. This promotion might be related to the increase of membrane hydrophilicity. The implantation of nano-ZnO into membrane inner surface (i.e., pore wall), as indicated by SEM/EDS tests, might be responsible for the enhancement of anti-irreversible fouling property. The water permeability of the modified membrane almost doubled by adding 6.7% nano-ZnO which was determined as the optimum dosage (within the dosage range in this study) for PVDF membrane modification. Additionally, the mechanical strength was found reinforced for modified membranes, which should also benefit the filtration application. (C) 2011 Elsevier B.V. All rights reserved.