Molecular and nanostructure designed superhydrophilic material with unprecedented antioil-fouling property for diverse oil/water separation

Substrate-Independent Cupric Phosphate Nanoflower–Mineralized Superhydrophilic Membranes for Diverse Oil–Water Separation

“…In the Cu 2p XPS spectrum of the Cu 3 (PO 4 ) 2 -PDA/PEI-mineralized membrane, the satellite features can be used to distinguish the oxidation state of Cu, and the satellite peaks at 941.1 and 945.6 eV indicate the presence of Cu 2+ (Figure g). In the XPS spectrum of the Cu 3 (PO 4 ) 2 -PDA/PEI-mineralized membrane, the presence of the P 2p peak and its intensity ratio indicate the existence of Cu 3 (PO 4 ) 2 in the sample (Figure h). ,, All of the results verify the successful preparation of the mineralized membrane.…”

“…Fabrication of the Cu 3 (PO 4 ) 2 -PDA/PEI-Mineralized Membrane. Unlike traditional electrochemical deposition or solution growth methods, 8,40 the facile mineralization strategy can form hybrid organic−inorganic Cu 3 (PO 4 ) 2 nanoflowers with superior stability, high roughness, and remarkable hydration capacity, which can be used for the separation process. Recently, amine-containing proteins have been used as the organic component to develop Cu 2+ complexes, where the complexes provide not only nucleation sites for primary crystals of Cu 3 (PO 4 ) 2 but also a driving force to form hybrid organic−inorganic Cu 3 (PO 4 ) 2 nanoflowers.…”

“…Unlike traditional electrochemical deposition or solution growth methods, , the facile mineralization strategy can form hybrid organic–inorganic Cu 3 (PO 4 ) 2 nanoflowers with superior stability, high roughness, and remarkable hydration capacity, which can be used for the separation process. Recently, amine-containing proteins have been used as the organic component to develop Cu 2+ complexes, where the complexes provide not only nucleation sites for primary crystals of Cu 3 (PO 4 ) 2 but also a driving force to form hybrid organic–inorganic Cu 3 (PO 4 ) 2 nanoflowers. – Using this amine-containing protein-inspired mineralization strategy, various amine-rich organic materials, such as PDA or chitosan, can induce the mineralization process to prepare Cu 3 (PO 4 ) 2 nanoflower-like particles. , Accordingly, herein, using this strategy, a two-step process was proposed to fabricate a hybrid organic–inorganic Cu 3 (PO 4 ) 2 nanoflower coating on the surface of various membranes.…”

“…It is believed that this special morphology and composition provide exceptional superhydrophilic characteristics and a remarkable capacity for binding water. 8 The Cu 3 (PO 4 ) 2 -PDA/PEImineralized membrane exhibits superhydrophilicity and superior oil repellency because the organic PDA/PEI layer cooperates with the inorganic Cu 3 (PO 4 ) 2 nanoflowers. The PDA/PEI-codeposited surface is always hydrophilic with a water contact angle (WCA) of ∼29°.…”

Bioinspired Under-Liquid Dual Superlyophobic Surface for On-Demand Oil/Water Separation

“…Oil/water separation has become a serious challenge on the global scale because of the frequent oil spillages into the ocean and endless release of oily wastewaters from industrial and domestic sources. − Membrane technology representing a simple, energy-saving, and environmentally friendly method can efficiently separate both immiscible and emulsified oils from water; therefore, it has attracted considerable attention from researchers in recent years. In particular, membranes with unique wettability properties (either superhydrophilic or superhydrophobic ones − ) demonstrate high affinity for water or oil, which enables the effective separation of oil/water mixtures. However, these single superwettability membranes cannot fully satisfy the complex requirements of the modern practical applications.…”