Rapid Approach to Synthesizing a Tannic Acid (TA)-3-Aminopropyltrietoxysilane (APTES) Coating for Efficient Oil–Water Emulsion Separation

Abstract

Plant polyphenol-inspired surface modification of membranes is helpful for oil−water separation. However, the preparation of this coating is time-consuming. Herein, we introduce a rapid synthesis of the TA-APTES coating by the addition of sodium periodate (SP). The surface chemical composition and morphology of the resultant TA-APTES hybrid coatings were characterized using SEM, ATR-FTIR, and XPS. The hydrophilicity and membrane performance were investigated by the water contact angle, pure water permeability, and oil rejection for an isooctane-in-water emulsion. The experimental findings revealed that the optimal microfiltration (MF) membrane (MF-TA-APTES-SP-0.05) displayed exceptional hydrophilicity and water permeability (9558 L m −2 h −1 bar −1 ). The membrane realized highly efficient separation with a permeability (4117 L m −2 h −1 bar −1 ) and rejection of oils (>99%). Furthermore, it possessed outstanding chemical stability and maintained underwater superoleophobicity even after exposure to harsh conditions. This simple and rapid strategy of developing hydrophilic coatings as a modifier for the poly(vinylidene fluoride) membranes has potential applications in oil−water separation and wastewater treatment.

Rapid and Eco‐Friendly Preparation of Antibacterial Gauze by Alkali‐Acid Redeposition of Quercetin on Gauze Fiber and Subsequent Ultraviolet‐Assisted Reduction of Silver In Situ

“…However, most reported plant-phenol coating strategies are based on the oxidative polymerization of plant phenols, which usually requires tens of minutes to hours. [15,16] Further, it has been reported that the rate of AgNPs generation via reduction can be accelerated by techniques such as heating, microwave irradiation, and ultraviolet radiation. [17,18] Among them, ultraviolet treatment exhibits notable advantages, such as low equipment demand and negligible impact on the substrate.…”