Synthesis And Characterization Of Mcsoporous Materials Based On Lysine Phosphonic Acid

Metal phosphonates have a variety of structures because of their ability to crop organic groups and diversified metal elements,which play an important role in catalysis,adsorption and separation.Among them,the organic-inorganic phosphonic acid hybrid material with the structure has attracted much attention.As the pore size of the mesoporous material is between the microporous and the macropores,which broadened the application range.Compared with pure inorganic mesoporous materials,organic-inorganic hybrid mesoporous materials with high mechanical strength,and easy to modify,which attracted many researchers eye.Periodic mesoporous organosilicas(PMOs)was the firstly investigated.However,the high cost of the organosiloxane limite the development.Thus,people will start to prepare the non-silica-based organic-inorganic hybrid mesoporous materials,in which the metal phosphonate mesoporous materials are one of the important species.We can control the pore size by designing different organic ligand,selecting appropriate templates and adjusting the pH and so on.The details are shown blew:1.Design the organic ligand:The organic phosphonic 2,6-bis(bis(phosphonomethyl)amino hexanoic acid was synthesized by using Mannich reaction,using lysine hydrochloride,phosphorous acid and formaldehyde as the raw materials.Three mesoporous materials were successfully synthesized,named TiP,AlP,SnP;2.Preparation of mesoporous phosphonic titanium material:TiP was prepared by hydrothermal at 120 ?,and the material was anatase crystal.Surface area was 315.45cm~3/g and the pore size was about 5 nm.In order to improve the photocatalytic efficiency,we try to load the zinc oxide nanoparticles by high temperature quenching,which named as TiP-ZnO.The photocatalytic experiments showed that the degradation rate was 41%in the blank group,78%in the TiP group and 92%in the TiP-ZnO group.The reaction rate constants of the three groups were 0.00808min-1,0101062min-1 and 0.03026 min-1,respectively.3.In addition,the lysine is essential amino acids and titanium has a good biocompatibility,so try to use it in drug release.In this paper,ibuprofen is loaded on mesoporous TiP material,which plays a good role in slow release.4.Preparation of mesoporous phosphonate alunmina material:With the CTAB as the template,the LTMP was used as the phosphine source and AICl3 as the aluminum source,we can prepared the AlP.The optimal temperature of the hydrothermal reaction was found by setting the temperature gradient.The surface area was 275 cm~3/g and the pore size is concentrated at 8-10 nm.It is applied to the adsorption of heavy metal lead ions by its high specific surface area and pore size.When the concentration of lead was 10mg/L,20mg/L,30mg/L,40mg/L,50mg/L,the adsorption efficiencies were 34.2%,33.7%,33.1%,22.8%and 22.3%respectively.5.Preparation of mesoporous phosphonate materials:With LTMP as the phosphine source,SnCl4 as the tin source,we can prepared the SnP.The SnP mesoporous materials were applied to catalyzed cyclohexanone,and the reaction rate of SnP was increased with the addition of catalyst.The conversion efficiency was 95%.