Study On Modification,Adsorption Behavior And Catalytic Performance Of Ti-based Nano Oxides

The traditional titanium dioxide(TiO2)semiconductor material has green,non-toxic and good stability,so it plays an important role in the field of photocatalysis.However,its small specific surface area and 3.2 eV forbidden band width are only excited by ultraviolet rays,resulting in very low utilization of visible light.Secondly,the high recombination rate of photogenerated electrons and holes reduces their photocatalytic activity.Ti-based nano-oxide is a one-dimensional nano-material based on TiO2 modification.It has the advantages of large specific surface area and ion exchange between layers.It has unique adsorption performance and catalytic activity.In this paper,titanium nanotubes/rods with different morphologies were first prepared by strong alkali hydrothermal method.The samples were characterized by XRD,HRTEM and BET.After the adsorption kinetics study,the titanate nanotubes(H2Ti3O7 NTs)conforming to the Langmuir adsorption model had the largest adsorption capacity(The maximum adsorption capacity Qmax=10.2 mg/g and the adsorption equilibrium constant Ka=0.3690 min-1).The excellent performance indicated that the Ti-based nanomaterials with layered structure were potential ion adsorbents.For refractory pollutants(such as lignin model compounds,ibuprofen,etc.),the photocatalytic properties of one-dimensional Ti-based nano-oxides were studied.The photocatalytic activity of Ti-based nano-oxides was related to the crystallinity of the catalyst.The catalysts with higher crystallinity had stronger catalytic activity.Subsequently,green and efficient photocatalysts based on C and N co-doped titanium based nanorods(NRs)was prepared by facile hydrothermal synthesis and interlaminar bonding interaction between layered Ti3O72-and tetramethylammonium hydroxide(TMAH).NRs were characterized by XRD,SEM,EDS,HRTEM,XPS and UV-Vis absorption spectra.The photocatalytic performance of the catalyst on organic dyes under simulated sunlight was tested.C,N-TiO2 NRs showed better photocatalytic activity under simulated sunlight,and the apparent reaction rate was 8.3 times that of TiO2 NRs.In addition,free radical experiments verified that·OH radicals,h+and·O2-radicals were the main active species in the degradation reaction.Finally,TiO2 NRs co-doped with Co2+ion and xylenol orange(XO)complex were prepared by interlayer ion exchange.The samples were characterized by BET,Zeta potential,FT-IR,Raman.The adsorption properties of Co,XO-TiO2 NRs on organic dyes at room temperature and normal pressure were emphatically studied.The sample showed strong adsorption activity for cationic dyes,which was in accordance with the quasi-second adsorption kinetic model.In this paper,Ti-based nano oxides with different morphologies were prepared and subjected to C,N element doping,Co element and Xylenol orange XO modification experiments.Because of its high specific surface area,unique surface charge,strong adsorption performance and photocatalytic performance,it has wide application prospects in the fields of wastewater treatment,semiconductor catalyst modification and nano-synthesis technology.