Fast preparation of a polydopamine/ceramic composite nanofiltration membrane with excellent permselectivity

Abstract

Fabrication of a dense polymer/ceramic composite membrane with high permeability remains a great challenge.

Dynamic Deposition of PDA on a Hollow Fiber Ceramic Membrane for Oily Water Treatment

“…Although some studies have investigated the modification of ceramic membranes with PDA, 5,22,32,33 to the best of our knowledge, this is the first work that proposes the dynamic deposition of PDA on hollow fiber ceramic membranes to reduce fouling in oily wastewater. The effect of the temperature on PDA polymerization was investigated to reduce the preparation time.…”

“…A coating layer of a hydrophilic polymer offers the advantage of flexibility and ease of operation; however, adhesion between the polymer and ceramic materials remains an important issue. ,,− Furthermore, procedures to enhance the presence of hydroxyl groups on ceramic membrane surface are quite complicated and present challenges for real-world implementation in industrial settings . One of the simplest alternatives for functionalization is the in situ polymerization of polydopamine (PDA), which strongly adheres to various organic and inorganic materials, thereby offering an interesting alternative for surface modification.…”

“…The membrane exhibited superhydrophobicity in air and good stability in several solvents. Wang et al formed a 43 nm PDA layer over a flat alumina membrane in just 10 min by introducing KMnO 4 to oxidize the PDA and improve the polymerization reactivity. The rejection of Congo red by the composite membrane increased from 47.7 to 80.4%, whereas the permeate flux decreased from 524 to 429 L·h –1 ·m –2 .…”

“…Zhu et al 31 Xiong et al 32 dynamically deposited a PDA layer under high-temperature conditions in a tubular ceramic membrane to reduce the coating time. This deposition method was performed in a cross-flow filtration system using a solution of DA (1 mg•mL −1 ), CuSO Although some studies have investigated the modification of ceramic membranes with PDA, 5,22,32,33 to the best of our knowledge, this is the first work that proposes the dynamic deposition of PDA on hollow fiber ceramic membranes to reduce fouling in oily wastewater. The effect of the temperature on PDA polymerization was investigated to reduce the preparation time.…”

Facile preparation of high performance GO/Mn3O4/PVDF composite membranes with intercalation of manganese oxide nanowires

“…To improve the binding force between the nanosheets, manganese oxide and the supporting membrane, polydopamine (PDA) was formed during membrane preparation with self-polymerization of dopamine hydrochloride. 19 The composite membrane structure and morphology were tested with scanning electron microscope (SEM), X-ray photoelectron spectrometer (XPS) and atomic force microscope (AFM). This work studied the utility of nanomaterials intercalation technique to improve the performance of GO/PVDF composite membranes, providing a novel nanofiltration membrane with excellent permselectivity.…”