Responsive Superwetting Materials For Controllable Complex Wastewater Treatment

Superwetting materials have been proved to exhibit satisfactory application potential in the treatment of oily sewage.By subtly adjusting the wettability and pore size,a series of superwetting materials holding various functions,which aim at different oily sewage including immiscible oil/water mixture and oil/water emulsion,have been successfully fabricated.However,the actual sewage in the production and life,which contains insoluble oil phase and soluble micromolecule simultaneously,is far more complex than the simple oily sewage mentioned above,and thus is beyond the current capabilities of the traditional superwetting materials.In this thesis,facing multiple types of complex sewages,we firstly devote to developing responsive superwetting materials with adjustable wetting behavior,and thus realize the controllable treatment of various immiscible oil/water mixtures and double emulsions.Besides,we integrate the superwetting property and catalytic property together,and achieve the simultaneously treatment of multiple contaminant.Furthermore,the in situ water quality detection using superwetting materials is investigated,which expands the application prospect of superwetting materials towards actual sewage treatment.The mains works are as follows:1)Based on the aminoazobenzene with cis-trans isomerization property,a photo responsive superwetting membrane,which can realize large-extent wettability transition,is fabricated through a roughness-adjusting strategy.The coordination between nano-Ag and amino group plays the key role in the construction of the membrane.The as-prepared membrane successfully realizes the controllable separation of different immiscible oil/water mixture,and expands the application prospect of azo materials in the water treatment field.2)Poly(N-isopropylacrylamide)and carbon nanotube have been modified on a poly(vinylidene fluoride)membrane substrate via vacuum filtration and hydrothermal reaction.Integrating the photothermal conversion property and the thermal isomerization property together,we endow the membrane with photothermal controllable wettability and thermally induced liquid evaporation property.The as-prepared membrane successfully realizes the in situ separation of various double emulsions,which provides a feasible strategy for the treatment of complex oil/water mixture in the wastewater.3)V₂O₅,a typical inorganic semiconductor photocatalytic material,has been modified on the copper mesh substrate through a hydrothermal method.Integrating photo responsive wettability transition property and photocatalytic property together,the obtained mesh is able to realize the controllable oil/water separation and the in situ degradation of soluble pollutants,which expands the application prospect of inorganic semiconductor catalyst.4)A p H responsive membrane holding isotropy/anisotropy wettability transition property is fabricated via a coating strategy.The coating consists of hydrophobic silica and octadecylamine is obtained by a hydrogen bond self-assembly reaction.The asprepared membrane on the one hand can realize the selective/nonselective liquid permeation,on the other hand can detect the signal of the treated liquids,which provides a new possibility for the controllable water treatment and signal detection involving superwetting materials.