Research On Preparation Of Porous Composite Material By Pickering Emulsion Template Method And Its Adsorption

Environmental deterioration and freshwater shortage have become global problems to be solved due to the rapid development of social economy and industry.In recent years,more and more attention has been paid to the treatment of heavy metal ions and organic dyes in industrial wastewater.Adsorption is one of the most popular methods to treat heavy metal ions and organic dyes.In this thesis,The humic acid/montmorillonite/chitosan magnetic microcapsules,humic acid/polyvinyl alcohol/chitosan composite porous beads,humic acid/polyvinyl alcohol@polypyrrole and humic acid/polyvinyl alcohol@polyaniline composite porous materials were prepared through the Pickering emulsion template method.The composites were characterized by using optical microscope,FTIR,TEM,XRD,SEM and BET.The adsorption performance of composites for Cu（Ⅱ）,Cr（Ⅵ）and amido black 10B were also tested.The main research contents and results are as follows:（1）Humic acid/montmorillonite/chitosan magnetic microcapsules were prepared by using Pickering emulsion droplets stablized by montmorillonite/humic acid composite colloidal particles as template via the chemical cross-linking of montmorillonite and humic acid by chitosan on the surface of Pickering emulsion droplets.Cu（Ⅱ）ions adsorption experiments results show that the adsorption performance of humic acid/montmorillonite/chitosan magnetic microcapsules is the best when the mass ratio of humic acid to montmorillonite is 7:3.The composite has the best adsorption performance at pH=5.The adsorption capacity increases with the increase of the adsorbent dose.The adsorption capacity reaches the maximum in 60minutes and the maximum adsorption capacity is 36.05mg.g^-1.The Langmuir isotherm model was used to describe the adsorption data well.（2）Humic acid/polyvinyl alcohol/chitosan composite porous beads were prepared by a combination of chemical crosslinking and physical crosslinking using humic acid colloidal particles as Pickering emulsion stabilizer and polyvinyl alcohol/chitosan aqueous solution as water phase.Cr（Ⅵ）ions adsorption experiments results show that the adsorption performance of humic acid/polyvinyl alcohol/chitosan composite porous beads is the best when the humic acid content is 0.5%.The composite porous beads have the best adsorption effect at pH=5.The adsorption capacity increases with the increase of the adsorbent dose.The adsorption capacity reaches the maximum in360 minutes and the maximum adsorption capacity is 64 mg.g^-1.The Freundlich isotherm model was used to describe the adsorption data well.The composite porous beads have a certain cyclic adsorption capacity.Amino black 10B adsorption experiments results show that the adsorption performance of humic acid/polyvinyl alcohol/chitosan composite porous beads is the best when the humic acid content is 0.5%.The composite porous beads have the best adsorption effect at pH=4.The adsorption capacity reaches the maximum in 480minutes and the maximum adsorption capacity is 70.21 mg.g^-1.The Freundlich isotherm model was used to describe the adsorption data well.After 4 adsorption regeneration cycles,the composite porous beads still have a certain adsorption capacity.（3）Humic acid/polyvinyl alcohol/polypyrrole porous composite and humic acid/polyvinyl alcohol/polyaniline were prepared by a combination of interfacial chemical oxidation polymerization and physical crosslinking using humic acid colloidal particles as Pickering emulsion stabilizer and polyvinyl alcohol aqueous solution as water phase.Cr（Ⅵ）ions adsorption experiments results show that the adsorption performance of humic acid/polyvinyl alcohol@polypyrrole composite porous materials is the best when the pyrrole content is 0.75%of the oil phase,and adsorption performance of humic acid/polyvinyl alcohol@polyaniline composite porous materials is the best when the aniline content is 1.2%of the oil phase.The two porous composite both have the best adsorption effect at pH=2.and the maximum adsorption capacity is 62.76 mg.g^-1and 69.26mg.g^-1,respecitvely.The adsorption capacity of the two composite materials reached the maximum within 360 minutes.The Freundlich isotherm model was used to describe the adsorption data well.After 4adsorption regeneration cycles,the two adsorption materials still maintain a high adsorption capacity.