Study On Preparation Of Hydroxyapatite Nanowires Hybrids And Their Properties

Hydroxyapatite(HAp),a kind of natural bioactive substance,has excellent biocompatibility,surface activity,ion exchangeability and inorganic similarity of bone matrix,which is a natural inorganic material recognized and used by human beings for a long time.After being artificially synthesized,the cost of HAphas greatly reduced,which has led to the rapid development of new HApfunctional materials,and has been widely used in biomedical,adsorption and many other fields.Hydroxyapatite nanowires,a novel type of HApmaterial,which shows excellent activity because of its high specific surface area.In this thesis,a novel hydroxyapatite nanowires(HApNW)with high aspect ratio and bending ability were synthesized by an innovative method.Then,the graphene-like materials(MoS₂)and biocompatible zirconium-based Mo Fs materials(UiO-66)were grown on the surface of HApNW by in-situ hydrothermal synthesis,which afforded two kinds of HApNW based hybrids.And their different properties were investigated.The content includes the following parts:1.Firstly,based on the introduction of the structural characteristics and types of HAp,the synthesis methods of different types of hydroxyapatite nanowires(HANW)are summarized,and then the preparation and application of HANW nanocomposites are reviewed.2.Using six natural polymer materials,three kinds of polysaccharides and three kinds of protein,as structure inducers,six kinds of hydroxyapatite nanomaterials(HApNM)were prepared,respectively.The effect of natural polymer structure on the micro-morphology of HApNM was investigated.The structures were characterized by SEM,FT-IR,EDS,XPS and so on.It was found that Zein was most excellent structure inducer among the above six natural polymer materials.Using zein as inducer,the synthesized products,hydroxyapatite nanowires(HApNW),showed uniform nanowire structure with high aspect ratio and bending ability.Its formation mechanism was ales discussed.3.Using the hydroxyapatite nanowires(HApNW)as the carrier,graphene-like materials(MoS₂ nanoparticles)were in-situ bonded to the surface of HApNW by solvothermal method,and a new type of coral-like nanorods,namely HApNW hybrid MoS₂ nanorods(MoS₂@HApNW),was successfully synthesized.Its structure was characterized by SEM,EDS,BET,XRD,FT-IR,TG and XPS.It was found that MoS₂ nanoparticles were uniformly bonded and coated on the surface of HApNW,forming a special morphology similar to coral rods,and the stability and surface active sites of HApNW hybrids were increased.Then,taking Pb²⁺as the adsorption target,the adsorption performance of MoS₂@HApNW was investigated.The results show that the HApNW hybrid material has excellent adsorption capacity for Pb²⁺in wastewater,and the adsorption capacity of MoS₂@HApNW can reach 493.5 mg/g.4.In order to study the biological activity of MoS₂@HApNW,firstly,the antibacterial property of MoS₂@HApNW was investigated,and the change of bacterial morphology was studied by SEM.Secondly,the promoting effect of MoS₂@HApNW on plant rhizome growth was investigated by pot experiment.The results showed that MoS₂@HApNW could effectively kill Escherichia coli and Staphylococcus aureus,thus showing excellent antibacterial activity.The results of pot experiment showed that MoS₂@HApNW showed excellent growth performance on the plant and root system of sunflower.Therefore,MoS₂@HApNW is a new type of multi-functional nano-fertilizer which is antibacterial and can promote the growth of plant and root system.5.Using HApNW as carrier,biocompatible MOFs material(UiO-66)was grown on the surface of HApNW in situ by hydrothermal reaction method to form HApNW hybrid UiO-66 material(UiO-66@HApNW)with rod-like micro-morphology.Its structure was characterized by SEM,EDS,FT-IR,XPS,XRD,BET and TG,and it was found that UiO-66 grew uniformly on the surface of HApNW.Taking F-as the adsorption target,the adsorption performance of UiO-66@HApNW was studied.The results show that the UiO-66@HApNW composite has good adsorption capacity for F^-,the removal rate can reach 99.3%,and the adsorption capacity can reach 49.7mg/g.In summary,using Zein as structure inducer,hydroxyapatite nanowires(HApNW),with higher aspect ratio and more regular morphology were successfully synthesized.Using the HApNW as carrier,different functional materials were bonded to the surface of HApNW to form a noval HApNW-based hybrids.The prepared HApNW hybrids not only showed excellent adsorption properties,but also showed excellent antibacterial properties,and promoted the growth of plant rhizomes.The research results are expected to provide a new type of functional materials for agricultural production.