Hierarchically textured superhydrophilic polyvinylidene fluoride membrane via nanocasting and post-fabrication grafting of surface-tailored silica nanoparticles†,Environmental Science: Nano

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Hierarchically textured superhydrophilic polyvinylidene fluoride membrane via nanocasting and post-fabrication grafting of surface-tailored silica nanoparticles†
Environmental Science: Nano ( IF 5.8 ) Pub Date : 2019-10-17 , DOI: 10.1039/c9en00983c
Guanhao Chen _{1,

2,

3,

4,

5} , Zhibo Ma _{1,

2,

3,

4,

5} , Kang Xiao _{5,

6,

7,

8} , Xiaomao Wang _{5,

9,

10,

11,

12} , Shuai Liang _{1,

2,

3,

4,

5} , Xia Huang _{5,

9,

10,

11,

12}

Affiliation

Fouling is widely recognized as a main barrier to the sustainable development of membrane separation technologies. This study demonstrated a hierarchically textured superhydrophilic membrane, which was fabricated via nanocasting and post-fabrication grafting of surface-tailored silica nanoparticles. Nanocasting, using a prepared polydimethylsiloxane plate as an intermediate transfer template, gave rise to a micro-scaled surface texture resembling the surface pattern of a stainless-steel mesh. The resultant textured membrane surface was then sequentially grafted with poly(methacrylic acid) and surface-tailored silica nanoparticles through plasma induced graft copolymerization and self-assembly dip-coating, respectively, thereby resulting in an extra nano-scaled nanoparticle layer. The appropriate hierarchical structure and high surface energy of the membrane surface enormously improved its affinity with water, thus rendering the resultant functionalized membrane (designated as textured_F) superhydrophilic (water contact angle instantly reduced to 0° upon contact). Compared with a commercial 0.22 μm membrane, the textured_F membrane exhibited a slightly higher permeability and a significantly improved rejection ability, probably owing to the dense silica nanoparticle layer which functioned as a selective barrier. Moreover, in the systematic multi-cycle filtration experiments with a practical membrane bioreactor supernatant, the textured_F membrane exhibited a ∼2.4 times higher cleaning efficiency than the commercial membrane, demonstrating a dramatically improved antifouling capability. This improvement was probably due to the superhydrophilic and hierarchical membrane surface, which potentially facilitated the formation of an in situ hydration layer and peripheral turbulent flow thus resisting the adhesion of foulants.

中文翻译：

分层纹理超亲水聚偏氟乙烯膜通过纳米浇铸和后制造接枝的二氧化硅纳米粒子的定制表面†

结垢被公认为是膜分离技术可持续发展的主要障碍。这项研究证明了分层织构的超亲水膜是通过表面定制的二氧化硅纳米粒子的纳米浇铸和预制后接枝。使用制备的聚二甲基硅氧烷板作为中间转移模板进行纳米浇铸，产生了类似于不锈钢网眼表面图案的微米级表面纹理。然后分别通过等离子体诱导的接枝共聚和自组装浸涂分别将所得的有纹理的膜表面接枝有聚（甲基丙烯酸）和表面定制的二氧化硅纳米颗粒，从而得到额外的纳米级纳米颗粒层。适当的分层结构和高的膜表面能，可以极大地提高其与水的亲和力，因此使所得的功能化膜（指定为Textured_F）具有超亲水性（接触后水接触角立即降至0°）。与市售的0.22μm膜相比，Textured_F膜的渗透性略高，排斥能力显着提高，这可能是由于致密的二氧化硅纳米颗粒层起到了选择性屏障的作用。此外，在使用实际的膜生物反应器上清液进行的系统多循环过滤实验中，纹理化的F膜的清洁效率是市售膜的约2.4倍，表明其防污性能得到了显着提高。这种改善可能是由于超亲水性和分层的膜表面，潜在地促进了膜表面的形成。与市售的0.22μm膜相比，Textured_F膜的渗透性略高，排斥能力显着提高，这可能是由于致密的二氧化硅纳米颗粒层起到了选择性屏障的作用。此外，在使用实际的膜生物反应器上清液进行的系统多循环过滤实验中，纹理化的F膜的清洁效率是市售膜的约2.4倍，表明其防污性能得到了显着提高。这种改善可能是由于超亲水性和分层的膜表面，这潜在地促进了膜的形成。与市售的0.22μm膜相比，Textured_F膜的渗透性略高，排斥能力显着提高，这可能是由于致密的二氧化硅纳米颗粒层起到了选择性屏障的作用。此外，在使用实际的膜生物反应器上清液进行的系统多循环过滤实验中，纹理化的F膜的清洁效率是市售膜的约2.4倍，表明其防污性能得到了显着提高。这种改善可能是由于超亲水性和分层的膜表面，潜在地促进了膜表面的形成。可能是由于致密的二氧化硅纳米颗粒层起到了选择性屏障的作用。此外，在使用实际的膜生物反应器上清液进行的系统多循环过滤实验中，纹理化的F膜的清洁效率是市售膜的约2.4倍，表明其防污性能得到了显着提高。这种改善可能是由于超亲水性和分层的膜表面，潜在地促进了膜表面的形成。可能是由于致密的二氧化硅纳米颗粒层起到了选择性屏障的作用。此外，在使用实际的膜生物反应器上清液进行的系统多循环过滤实验中，纹理化的F膜的清洁效率是市售膜的约2.4倍，这表明其防污性能得到了显着提高。这种改善可能是由于超亲水性和分层的膜表面，潜在地促进了膜表面的形成。原位水化层和周围湍流，从而阻止了污垢的粘附。

更新日期：2020-01-02

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