Construction Of "Lotus-leaf"-inspired Superhydrophobic Surface And Their Adsorption Properties Toward Oils And Organic Solvents

Frequently dumping of oils and organic solvents has created serious environmental and ecological disruption.Therefore,there is an urgent need for a high performance material capable of rapidly and efficiently adsorbing oils and organic solvents from water.In general,the oil absorbing material has a well-developed pore structure and good water repellency,and in particular,the surface has a superhydrophobic property,that is,the water contact angle is higher than 150°.Therefore,the construction of superhydrophobic oil-absorbing materials has become a research hotspot in this field.The lotus leaf structure is one of the typical superhydrophobic surfaces.The principle of hydrophobicity is that the microemulsion structure and the waxy layer of the surface work synergically.Inspired by this,a“lotus-leaf-mimc”surface was constructed through self-assembly and surface modification based on inexpensive porous substrates。Then,a series of superhydrophobic oil-adsorbing materials was prepared,achieving fast adsorption and recycling of oily pollutants.The main research contents of this paper are as follows:Firstly,a“lotus-leaf-mimc”surface was constructed through self-assembly and surface grafting method,based on melamine sponge as the porous substrate and SiO2nanoparticles/fluoride moleules as building blocks.The SiO₂@TA@Ag oil-adsorbing mateirals were prepared through manipulating the topological structure by SiO₂ particle loading and chemical strucures by fluoride modification.The SiO₂@TA@Ag oil-adsorbing mateirals exhibited a water contact angle of 154.09°,which also showed a the adsorption capacity of 69-153（its own weight）toward various oils/organic solvents,accompanied with desirable recovery ability.By assembling a superhydrophobic sponge on the peristaltic pump,a continuous oil-water separation device was then established,achieving continuous cleaning of the organic solvent from the water.Secondly,a“lotus-leaf-mimc”surface was constructed through self-assembly and surface modification method,based on kakap as the porous substrate and MOFs nanoparticles/alkane moleules as building blocks.The kapok/TA-Fe/ZIF-8-D oil-adsorbing mateirals were prepared through manipulating the topological structure by MOFs particle loading and chemical strucures by alkanes modification.The kapok/TA-Fe/ZIF-8-D oil-adsorbing mateirals exerted monolithic,porous and superhydrophobic properties,exhibiting a water contact angle of 162.31°.This oil-adsobing mateiral also showed the adsorption capacity of 72.08（its own weight）toward various oils/organic solvents.73.37%-82.85%of loading capacity was retained after recycling for 73.37%-50 times.Thirdly,a“lotus-leaf-mimc”surface was constructed through self-assembly and surface carbonylation method,based on kakap as the porous substrate and MOFs nanoparticles/carbon as building blocks.Two kinds of oil-adsorbing mateirals,Biomass-C/ZIF-8-C and Biomass-C/MIL-53-C were prepared through manipulating the topological structure by MOFs particle loading and chemical strucures by carbonylation.Both oil-adsorbing mateirals showed superhydrophobic properties with a water contact angle of 141.53°.This oil-adsobing mateiral also showed the adsorption capacity of higher than 100（its own weight）toward various oils/organic solvents.