Study On Fabrication And Properties Of UiO-66 Mesh Membrane In Oil-Water Separation

In our production and daily life,the increasing discharge of oily wastewater from industry and the oil spill will not only cause serious environmental pollution problems,but also endanger the entire ecosystem.In the face of these problems,special wettable materials have been playing an important role in the field of oil-water separation in recent years.Wettability is the property of the material.The wettability is mainly determined by the microstructure and the chemical composition of the material.It is inspired by the lotus leaf.The upper surface is a super-hydrophobic self-cleaning surface,while under water,the oil droplets show spherical on the lower surface of the lotus leaf.It was found that the structure of the lower surface of lotus leaves was composed of 30-50μm convex papillae and nano-scale grooves.Inspired by nature,underwater superoleophobic surfaces with hierarchically rough structures and specific chemical compositions have been constructed.A large number of materials with special wettability have been applied in the field of oil-water separation.Metal Organic frameworks（MOFs）have been one of the hot research topic materials.MOFs have a specific surface and a certain tailoring property.MOFs are a kind of new porous crystal materials,and have been widely applied in many fields depending on strong chemical stability and thermal stability.It is controled by self-assembly of metal clusters with organic ligands.By controlling metal and ligand self-assembly,MOFs materials can be designed into a variety of special structures,such as particles,powders,thin films,fibers,core-shell structures,membrane etc.Based on the chemical functionalization of MOFs materials,carboxylic acids and hydroxyl groups of MOFs afford a hydrophilic surface.At the same time,the MOFs materials can be controlled to form specific structure.Therefore,the functional structure and chemical composition of MOFs materials can meet the requirement of underwater superoleophobic materials.Among the large family of MOFs,Zr-based MOFs,have showed outstanding stability,excellent properties and functions,and promising MOF materials for various applications.The first Zr-MOF is Zr₆（O）₄（OH）₄（BDC）₆（UiO-66）,with 12-coordinated Zr₆（O）₄（OH）₄（CO₂）₁₂ clusters.This MOF is characterised by high mechanical,thermal,and chemical stability due to its exceptional metal-ligand bond strength,and has been developed for various kinds of applications.In this paper,a facile strategy was successfully demonstrated to design UiO-66 nanocrystals coated on stainless steel mesh for oil-water separation research.