Bio-inspired fabrication of superhydrophilic nanocomposite membrane based on surface modification of SiO2 anchored by polydopamine towards effective oil-water emulsions separation

By Jiuyun Cui, Zhou Zhiping, Atian Xie, Minjia Meng, Yanhua Cui, Liu Siwei, Jian Lu, Shi Zhou, Yongsheng Yan, Hongjun Dong. Separation and Purification Technology, 2019

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Abstract A new PVDF@pDA@SiO2 nanocomposite membrane was fabricated by virtue of the surface modification of polydopamine anchored SiO2 on PVDF membrane through a facile and eco-friendly preparation process. It possessed the superior superhydrophilicity/underwater superoleophobicity properties and presented the outstanding antifouling oil performance and high-efficiency separation ability for oil-water emulsions, which mainly resulted from its special surface micro-nano structure and pore induced capillarity phenomenon. Furthermore, the PVDF@pDA@SiO2 nanocomposite membrane also exhibited the splendid separation performance, regeneration ability and universality for various oil-water emulsions separation. In addition, the oil-water emulsion separation mechanism was discussed in depth. This work might provide a significant guidance for large-scale production and application of this nanocomposite membrane in the fields of wastewater recovery and drinking water treatment.

Subfields: Biomedical Engineering, Surfaces, Coatings and Films, Water Science and Technology

View Paper: https://www.semanticscholar.org/paper/77f8da9d4f54e9e248d8fb556b48dd9d51d605aa