膜蒸馏用PVDF抗复合污染膜的制备与测试

摘要

为提高膜的抗污染能力，对聚偏氟乙烯（PVDF）平板膜进行表面涂覆改性，得到超疏水PVDF平板膜，再将超疏水PVDF平板膜进行表面亲水化改性，制备出超疏水/亲水复合PVDF膜。当PVDF的质量浓度为2%、聚乙二醇（PG）的质量浓度为39%、涂敷液温度为50℃、蒸发时间为10 s、凝固浴温度为60℃时，超疏水PVDF平板膜接触角达到154.8°。表面亲水改性制得的PVDF超疏水/亲水复合膜的接触角为41°。然后研究了超疏水PVDF平板膜和PVDF超疏水/亲水复合膜的抗膜污染性能。结果显示，超疏水PVDF平板膜具有优良的抗无机污染性能和一定的抗有机污染性能；PVDF超疏水/亲水复合膜不仅具有优良的抗无机污染性能，而且其抗复合污染性能尤其是抗有机污染性能得到明显提升，为进一步构建高性能膜蒸馏抗污染膜提出了一个可行的技术方向。

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	李英
	高云霄
	李保安

关键词：聚偏氟乙烯；表面涂敷；超疏水改性；亲水改性；膜蒸馏

Abstract：

The PVDF superhydrophobic membrane was obtained by coating process, and then it was hydrophilic modified. The membrane superficies structure, contact angle, and other membrane properties were provided. The experimental result indicated that the biggest contact angle of the modified membranes was achieved when the PVDF content was 2%, PG content was 39%, temperature of casting solution was 50℃, vaporization time was 10 s, and temperature of coagulation bath was 60℃. And the result also presented that the least contact angle of the PVDF superhydrophobic/hydrophilic membrane was obtained when the content of nanoparticle TiO₂ was 31.5 mg/L. The direct contact membrane distillation (DCMD) result test indicated that the capabilities of inorganic pollution anti-fouling of superhydrophobic membranes were improved in comparison with the original one, and not only the capabilities of inorganic pollution anti-fouling of the superhydrophobic/hydrophilic membrane were improved compared with the original one, but also were the properties of organic pollution anti-fouling of the superhydrophobic/hydrophilic membrane.

Keywords： PVDF； coating surface； superhydrophobic modification； hydrophilic modification； membrane distillation

Received 2015-05-03;

Fund:

天津市科技支撑计划项目（12ZCZDSF02200）。

Corresponding Authors: 李保安,E-mail:libaoan@tju.edu.cn。 Email: libaoan@tju.edu.cn

About author: 李英(1989-),硕士研究生,从事膜蒸馏膜制备与改性方面的研究。

引用本文:

李英, 高云霄, 李保安.膜蒸馏用PVDF抗复合污染膜的制备与测试[J]. 化学工业与工程, 2016,33(6): 49-55

Li Ying, Gao Yunxiao, Li Baoan.Modification of Polyvinylidene Fluoride (PVDF) Membrane with Ability of Pollution Anti-Fouling for Membrane Distillation[J]. Chemcial Industry and Engineering, 2016,33(6): 49-55

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