Inner Surface Hydrophilic Modification of PVDF Membrane with Tea Polyphenols/Silica Composite Coating

Abstract

The use of Polyvinylidene fluoride (PVDF) membranes is constrained in wastewater treatment because of their hydrophobic nature. Therefore, a large number of researchers have been working on the hydrophilic modification of their surfaces. In this work, a superhydrophilic tea polyphenols/silica composite coating was developed by a one-step process. The composite coating can achieve not only superhydrophilic modification of the surface, but also the inner surface of the porous PVDF membrane, which endows the modified membrane with excellent water permeability. The modified membrane possesses ultrahigh water flux (15,353 L·m−2·h−1). Besides this, the modified membrane can realize a highly efficient separation of oil/water emulsions (above 96%).

Preparation of N-MG-modified PVDF-CTFE substrate composite nanofiltration membrane and its selective separation of salt and dye

“…Chen et al 13 used polyethylene glycol dimethacrylate (PEGDMA) to graft-modify PVDF and found that the PVDF- g -PEGDMA membrane exhibited a decrease of about 80% in bovine serum albumin (BSA) adsorption compared with the original PVDF membrane, and the water contact angle decreased to 0°, greatly improving the hydrophilicity of the membrane. Xu et al 14 prepared a super-hydrophilic tea polyphenol/silica composite coating, which not only achieved super-hydrophilic modification on the porous PVDF membrane surface but also its inner surface, generating a modified membrane with excellent water permeability and ultrahigh water flux.…”

Simple temperature-regulated polymerization for the fabrication of a tea polyphenols-modified PVDF membrane for emulsion separation

“…Zhang et al 33 prepared tea polyphenols-modified polypropylene membranes for oil–water separation. Xu et al 34 developed a tea polyphenols and silica composite coating to obtain a superhydrophilic PVDF membrane. Wu et al 35 investigated a simple membrane modified with tea polyphenols and titanium ions to reduce membrane contamination.…”

Constructing a Hierarchical Hydrophilic Crosslink Network on the Surface of a Polyvinylidene Fluoride Membrane for Efficient Oil/Water Emulsion Separation

“…In the past few years, extensive focus has been devoted to the landmark study of mussel-inspired hydrophilic modification materials [ 20 , 36 , 37 ]. Plant polyphenol-based coatings have garnered extensive research interest because of their stable surface binding affinity and drastic hydrophilicity on diverse substrates [ 38 ]. For example, Qiu et al reported a straightforward co-deposition strategy based on a reaction between catechol and polyethyleneimine to form a constructed hierarchical superhydrophilicity layer on the surface of polypropylene microfiltration membranes.…”