▎ 摘　　要

NOVELTY - Janus composite comprises a hydrophobic nanoparticulate component supported by a 2- or 3-dimensional hydrophilic framework. USE - The Janus composite is used for adsorbing oil from an oil-in-water emulsion. The the Janus composite is used to partially pack or fully pack a structure for separating oil from an oil-in-water emulsion, optionally the structure is a cartridge, sponge or a filter device, or to prepare a dispersion of the Janus composite in an oil-in-water emulsion, and to separate an oil from an oil-in-water emulsion, where the emulsion comprises petroleum refinery wastewaters, produced water, flowback water from fracking operations, water from industrial cleaning, steel manufacturing, bilge and ballast water, food processing wastewater, agricultural wastewater, or sewage effluent (all claimed). The Janus composite is used to partially or fully pack a structure for separating oil from an oil-in-water emulsion, or to make a dispersion in an oil-in-water emulsion, where the structure is a cartridge, sponge or other device to facilitate oil separation. The Janus composite is used for separation of oil from oil-in-water emulsions. ADVANTAGE - The Janus composite possess heterogenous wettability (hydrophobic/hydrophilic dual properties), and is capable of separating oil from the aqueous phase of the emulsion by de-emulsifying, coalescing, and trapping the oil for efficient collection of fine oil droplets. The Janus composite is surface active and hydrophobic/oleophilic. The Janus composite traps a large number of fine oil droplets to make them coalesce, and selects the relative proportions and wettability of each component to impart a net hydrophobic character to the Janus composite. DETAILED DESCRIPTION - An INDEPENDENT CLAIM is included for use of the Janus composite to partially pack or fully pack a structure for separating oil from an oil-in-water emulsion, optionally the structure is a cartridge, sponge or a filter device, or to prepare a dispersion of the Janus composite in an oil-in-water emulsion, and to separate an oil from an oil-in-water emulsion.