Morphology-controlled Synthesis And Application Of K_xMnO₂ Nanostructures By Imidazlium Ionic Liquids

Room temperature ionic liquids(RTILS)are composed of anion and cation,and it is a substance in liquid form at room temperature or near room temperature of less than 100 degrees Celsius,and also an ionic salt.These characteristics are determined by the unique structure of the ionic liquid,and its wide range of applications foreshadowing precedent foundation.Manganese dioxide as an important metal oxide has a unique chemical and physical properties.It has been widely applied to the lithium ion batteries,sensors,catalysts,energy storage devices,as well as environmental science adsorbent-removal of the functional material of the organic contamination or heavy metal ions in wastewater.In this paper,we first synthesized the ionic liquids of different chain lengths and different anions imidazolyl,as well as polymeric ionic liquid,and use them to control KxMnO2 nanostructure morphology.Imidazolyl ionic liquid has a weak reducibility,so in the case of different pH values,it is possible to MnO4-restore become KxMnO2 nanostructural.Through using the BMIC,HMIB and polyVEIB,EMIB control KxMnO2 nanostructural morphology,we found a different ionic liquid of KxMnO2 microsphere morphology,size is influential wherein BMIC/KxMnO2 microspheres is the largest,nanosheet also the most intensive,specific surface area is the largest.And we study the impact of different temperatures and acid strength on the morphology and size of the KxMnO2 microspheres.In addition,we will be four different KxMnO2 microspheres applied to the decolorization of CR aqueous solution,which we use one of the BMIC/KxMnO2 microspheres and polyVEIB/KxMnO2 of microspheres example experiment.We get a better decolorization of CR aqueous solution,decolorization rate of approximately 60.1%and 41.9%,respectively,after the decolorization time to 120 min.However,the decolorization rate of ordinary MnO2 powder as an adsorbent of Congo red was only 23.8%.Then,with the copolymerization using of styrene and VEIB ion liquid,we successfully synthesized poly(St-co-VEIB)microspheres.As in poly(St-co-VEIB)ametabolous salt groups of the surface of the microspheres which have the function of the ion-exchange and weak reductive.MnO4-enriching in the surface of the microspheres of poly(St-co-VEIB)is simultaneously reducing into KxMnO2,resulting in a new type of flower-like KxMnO2/poly(St-co-VEIB)composite microspheres.And we study the influence of KxMnO2/poly(St-co-VEIB)composite microspheres morphology and size in different temperatures and acid strength.Shortly thereafter,using THF(tetrahydrofuran)to remove poly(St-co-VEIB)core,we get the flower shaped KxMnO2 by KxMnO2 nanosheet.Hollow microspheres were successfully prepared out.Then,using TEM,SEM,XRD and other means of detection of poly(St-co-VEIB)microspheres,KxMnO2/poly(St-co-VEIB)composite microspheres and flower-like KxMnO2 hollow micro were characterized by the characterization results can be sure that we are prepared poly(St-co-VEIB)microspheres,KxMnO2/poly(St-co-VEIB)composite microspheres and hollow microspheres of flower-like KxMnO2.And we can clearly see the thickness of KxMnO2 nanosheet is about 5 nm and the length of the edge of KxMnO2 nanostructure is about 40 nm.Similarly,we synthesized the flower-like KxMnO2 hollow microspheres application to the decolorization of CR aqueous solution.Due to the thin shell of the hollow microspheres flower-like KxMnO2,on the surface of nanosheets distribution is relatively sparse,the solution of Congo red adsorption area,the flower KxMnO2 hollow microspheres decolorization of Congo red solution the decolorization rate is higher than BMIC/KxMnO2 microspheres and polyVEIB/KxMnO2 of microspheres in the bleaching time of 120 min,and its decolorization rate is approximately 88.8%.