Nanocomposite Deposited Membrane for Oil-in-Water Emulsion Separation with in Situ Removal of Anionic Dyes and Surfactants

Abstract

The decontamination of various pollutants including oils, organic dyes, and surfactants from water is an unprecedented issue throughout the world. A facile filtration process for in situ multifunctional water purification by employing a low-cost and easy-made catechol-polyethylenimine (PEI) nanocomposite deposited membrane has been designed. In combination with the intrinsic hydrophilicity of amino-rich groups, the resultant membrane possesses superhydrophilicity and underwater superoleophobicity, which is simultaneously advantageous for capturing anionic pollutants due to the electrostatic interaction. Such membrane can be successfully used for sundry surfactant-stabilized oil-in-water emulsions separation and pH-controllable removal of water-soluble dyes and the remaining surfactants at the same time. The excellent characteristics, i.e., fabrication protocol that is easy to scale up, better alkaline resistance, selectively controllable removal ability of anionic dyes, and surfactants with unaltered adsorption performance over 30 consecutive adsorption-desorption-washing cycles, will facilitate its versatility and practicability in environmental remediation and wastewater purification.

Lowering Interfacial Dissolved Gas Concentration for Highly Efficient Hydrazine Oxidation at Platinum by Fluorosurfactant Modulation

“…After galvanostatic tests for 1500 s, the ECSA for CFPS‐Pt dropped by 11.6 %, whereas a substantial loss of 16.5 % in ECSA was observed for pure Pt. This result shows CFPS did not cause any significant loss of active surface area‐instead, it slowed down the surface deactivation, which should be a result of the electrostatic repulsion between CFPS and positively charged Pt surface during HzOR . These results indicate the effective exposure of active sites during hydrazine oxidation with the modulation of CFPS.…”

In situ growth of hierarchical Al2O3 nanostructures onto TiO2 nanofibers surface: super-hydrophilicity, efficient oil/water separation and dye-removal

“…Adsorbent q e (mg g −1 ) k 2 (g mg The pH value of the solution had significant influence on the adsorption [49,50], and its effect was further studied by using acetic acid and ammonium hydroxide respectively. It has been found that the adsorption capacity toward CR molecules was improved obviously at acidic pH (figure S13 and table S3).…”

The Use of Polymers in the Flotation Treatment of Wastewater

“…A previous study has shown that it was possible to selectively remove surfactants and anionic dyes with a modified membrane comprising a membrane onto which catechol-PEI was deposited [45]. The dual functioning system can be used to treat surfactant-stabilized oil in water emulsions and water-soluble dyes at the same time.…”