Microstructure Construction And Functional Design Of Porous Materials

The separation of water and oil mixtures is considered a global challenge due to frequent oil spills and increasing industrial oily wastewater.Generally,the oily wastewater often contains insoluble oil and soluble organic contaminations.For insoluble parts,one of the typical treatment methods is to separate it from water,but not to remove soluble contaminants from the wastewater.Photocatalysis,as one of the most promising green chemistry technologies,is particularly suitable for the degradation of organic pollutants.Therefore,combining photocatalytic technology with oil-water separation to purify oily wastewater is an effective strategy.In this research background,the multifunction Janus Cu(OH)2@Cu2O/Cu mesh was constructed by electrochemical corrosion,hydrophobic modification,selective irradiation and in situ reduction using copper mesh as the base material.The specific research of this topic is as follows:1.The superhydrophobic Cu(OH)2/Cu mesh was obtained by electrochemical corrosion and modification of n-octadecyltriethoxysilane.The effect of electrochemical corrosion time on the growth of Cu(OH)2/Cu mesh was investigated.The results show that the pore size of the copper mesh decreases with the increase of electrochemical corrosion time.2.The Cu(OH)2@Cu2O/Cu mesh with asymmetric wettability was obtained by controlling the UV light irradiation time of the superhydrophobic Cu(OH)2/Cu mesh and then reducing by N2H4 vapor.The chemical composition,surface morphology,elemental composition,wettability and chemical composition of the samples were analyzed by XRD,SEM,TEM,contact angle and XPS,respevtively.And the effects of UV light irradiation and N2H4 vapor reduction on the wettability of the composite Cu(OH)2@Cu2O/Cu mesh were investigated.The combination of photochemical reaction and reduction reaction promotes the transition of the UV light-irradiated surface from superhydrophobic to hydrophilic.3.The osmotic pressure test,permeate flux test and oil-water separation test were carried out on Janus Cu(OH)2@Cu2O/Cu mesh,and the photocatalytic performance of Janus Cu(OH)2@Cu2O/Cu mesh was studied.The results show that the Janus Cu(OH)2@Cu2O/Cu network has high water pressure resistance,high flux(for pure solvent)and high separation efficiency,and can effectively degrade organic pollutants under different photocatalytic systems.Janus mesh has broad prospects in the field of water purification due to in situ oil removal and photodegradation of organic dyes.Figure[42]table[10]references[109]...