Jump to main content
Jump to site search


Ultrathin in situ silicification layer developed by electrostatic attraction forced strategy for ultrahigh-performance oil-water emulsions separation

Abstract

Membrane fouling caused by oil or other pollutants is one of the major challenges for membrane separation technology used for the emulsified oil/water purification. Aiming at the realization of comprehensive fouling-resistant/fouling-releasing property, and further achieving long-term cyclic separation, an ultrathin silica (SiO2) layer is conformally engineered onto a porous polyketone (PK) substrate, via the electrostatic attraction forced silicification process. This in situ silicification forms an ultrathin and superhydrophilic/underwater superoleophobic interface structure that allows the realization of ultrahigh water permeance up to 7533 Lm-1h-1bar-1, an exceptional high emulsion fluxes up to 6000 Lm-1h-1bar-1 (close to the pure water permeance), and incorporated with a high rejection of > 99.9% against various of oily emulsions. The unique design of the superhydrophilic silicification layer grown onto the hydrophilic PK substrate also endowed the membrane with a thoroughly antifouling property against the comprehensive oily emulsions containing various of pollutants such as proteins, surfactants, and other natural organic materials (NOM), from which a nearly 100% recovery ratio of permeating flux could be obtained after several cycles of oily emulsions filtration. The use of inorganic SiO2 modification incorporated with highly chemical inert PK substrate (SiO2-d-PK membrane) also enabled the application of SiO2-d-PK membrane under more challenging conditions, where the great tolerance and long-term stability toward salty, strong acid/alkaline solutions, and various organic solvents were further demonstrated. Overall, this study provides an insight into engineering the ultrathin membrane with ultralow fouling-propensity in treating challenging oily emulsions.

Back to tab navigation

Supplementary files

Publication details

The article was received on 23 Jul 2019, accepted on 29 Sep 2019 and first published on 03 Oct 2019


Article type: Paper
DOI: 10.1039/C9TA07988B
J. Mater. Chem. A, 2019, Accepted Manuscript

  •   Request permissions

    Ultrathin in situ silicification layer developed by electrostatic attraction forced strategy for ultrahigh-performance oil-water emulsions separation

    L. Zhang, Y. Lin, H. Wu, L. Cheng, Y. Sun, T. Yasui, Z. Yang, S. Wang, T. Yoshioka and H. Matsuyama, J. Mater. Chem. A, 2019, Accepted Manuscript , DOI: 10.1039/C9TA07988B

Search articles by author

Spotlight

Advertisements