Study On The Oil/water Emulsions Separation Of Superwettability Materials

With the rapid development of industry,water pollution problem has become more serious,and especially the oil leakage,organic dyes and other emissions have caused unexpected damage to human health and marine ecology.Many scientists around the world are focused on the treatment of contaminated water.However,traditional oil/water separation materials and measures are not able to effectively separate oil/water mixtures,especially various emulsions and water-soluble contaminants.In addition,most of the superwetting materials have a series of disadvantages,such as complicated preparation steps and expensive materials,and so forth.Morever,poor mechanical properties and single function are the problems that need to be solved for plenty of superwetting materials.To deal with a large amount of oily wastewater,the large-scale preparation of oil/water separation materials must be realized.However,at present,most of the special wettability oil/water separation and water remediation materials are difficult to adapt to the complex requirements in real environments.Therefore,there is an urgent demand to prepare some multi-functional superwetting materials,which can not only achieve large-scale industrial production,but also meet the practical needs of oil/water emulsion separation and water-soluble contaminants removal.The main contents as follow:?1?The waste cigarette filter electrospun membranes membranes were fabricated by a simple electrospinning method.This work not only reduced the environmental pressure but also solved the environmental pollution problem.The membranes showed excellent underwater superoleophobicity and underoil superhydrophobicity for efficient on-demand emulsions separation including oil-in-water and water-in-oil emulsions.Moreover,the separation efficiencies of various emulsions were up to99.6%.In addition,the as-prepared membranes showed outstanding recycling performance.?2?The multifunctional TiO₂/inorganic adhesive coated mesh with underwater superoleophobicity was fabricated by a facile spray-coating method.Because of the excellent underwater superoleophobic property and small pore size of the as-prepared coated mesh,the mesh can achieve effective separation toward surfactant-stabilized oil-in-water emulsions.More importantly,the as-prepared coated mesh can withstand harsh conditions such as sandpaper abrasion,sand impact and solvents immersion and so on.The results indicated that the TiO₂/inorganic adhesive coated mesh was still able to successfully separate oil-in-water emulsions after the mechanical durability tests,displayed remarkable environmental stability.In addition,the as-prepared coated meshes possessed high photocatalytic activity for the organic dye.?3?Palygorskite is a kind of environmental water-absorbing and water-retaining material.The multifunctional palygorskite layer with sandwich-like architecture was fabricated by a facile and universal applicable approach without any further modification.A series of surfactant-stabilized oil-in-water emulsions can be successfully separated with the separation efficiency exceeding 99.4%by gravity.Meanwhile,the separation mechanism of oil-in-water emulsion was detailedly explored.Due to the unique structural characteristics of palygorskite layer,it showed good adsorption performance for organic dyes and heavy metal ions.