Aminoazobenzene@Ag modified meshes with large extent photo-response: towards reversible oil/water removal from oil/water mixtures

Abstract

A large-extent photo-responsive wettability transformation is realized by aminoazobenzene@Ag to selectively remove oil/water.

A Review on Oil/Water Mixture Separation Material

“…Besides, azo compounds are other common star molecules used to prepare the photoresponsive material, owing to the superior cis−trans isomerism property. 210 Qu et al 211 anchored aminoazobenzene (AABN) and nano-Ag pine needles on pretreated porous polydopamine (PDA) meshes, which realized a large-extent transformation with a WCA between 150°, after being exposed to visible light, and about 10°under the UV radiation of 365 nm. The photoresponsive wettability from hydrophobicity to hydrophilicity endowed the azo-based membrane with satisfactory oil removal efficiency from water.…”

Reversibly switching water droplets wettability on hierarchical structured Cu2S mesh for efficient oil/water separation

“…From this idea, different chemical substances can be coated on a roughened surface, or mesh, creating tunable superhydrophobic or superoleophilic properties that can be controlled via morphology engineering. The chemical composition or the components of solid surfaces is all-important in controlling the intermolecular forces between a solid and a liquid, which can be triggered by a series external stimuli such as light, temperature, solvents, pH, electrical potential, and ions or molecules 41,42,59–62 . Using these external stimuli to switch wettability is reversible over many cycles and therefore this is a robust method for realizing wettability changes on a surface 63–68 .…”

Facile optimization of hierarchical topography and chemistry on magnetically active graphene oxide nanosheets

“…In the past, bio-inspired superhydrophobic sponges and membranes were successfully used for selective absorption and ltration based 'bulk'-oil separation from oil/water mixtures. [36][37][38][39][40] However, the superhydrophobicity embedded on these macro-scale objects (sponge and mesh) is fundamentally inappropriate for remediating tiny oil-in-water emulsion droplets as the bulk aqueous phase prevents the access of submicron oil droplets to the selective superoleophilic interfaces. In addition to this, the coating of various chemicals-including asphaltenes, resins, and naphthenic acids around the crude oil droplets pose a severe challenge to oil/water separation; unlike other emulsions that are made out of rened oils.…”