水热法合成TiO2和H2Ti3O7·xH2O纳米管

1、2021-11-161TiO2 and H2Ti3O7xH2O nanotubes synthesized by hydrothermal method 刘娟英，王胜军，吴昆杰，王金荣，王文明2021-11-162 Timeline Fig . Timeline describing the development of TiO2-related nanotubular structures .2021-11-163 References of hydrothermal methodFormation of titanium oxide nanotube, Langmuir,1998Titan

2、ia nanotubes prepared by chemical processing, Adv. Mater.,1999H2Ti3O7-typed nanotubes made vis a single alkaline treatment, Adv. Mater.,2002Formation,structure,and stability of H2Ti3O70.8H2O nanotubes, J.Phys.Chem.B., 2005Protonated titanates and TiO2 nanostructured materials：synthesis,properties,ap

3、plications, Adv. Mater., 20062021-11-164Synthesis of TiO2 nanotube6nmanataseTiO2pulverized into powder45mtreatmentwith NaOH(T、C)washingwith HCl、DWSeparated bycentrifugationpH7anataseTiO2nanotubesLangmuir,19982021-11-165Composition after chemical treatment 1.Si 0.7mol% , by ICP-AES. 2.Na+ 0.15%, by A

4、AS. 3.Ti and O , by energy-dispersive X-ray (EDX).Specific Area (SA) 1.SA of the as-precipitated was 150m2 g-1. 2.SA 400m2 g-1 after treatment at 100 with 10M NaOH Analysis of Composition and Specific Area2021-11-166 TEM and Selected-area electron diffraction(a) The powders treated by 10M NaOH for 2

5、0h at 110 . (b) SAED pattern of the anatase phase nanotubes(a)(b)2021-11-167 ConclusionTo discuss the effect of SiO2 doping, commercial TiO2 (mixture phase of rutile and anatase) was also treated, the tube-shaped products were also found.Mechanism of the formation of the nanotube is not clear and is

6、 under investigation. Oxide nanotubes can be obtained easily via chemical treatment.2021-11-168Adv.Mater.1999Synthesis of TiO2 nanotube5s/cm A：10 ms/cm B：10s /cm C：800s/cmD：5 s/cm2021-11-169 TEMTEM images of the raw material and sample A, B, C and D2021-11-1610 Laser Raman SpectraTi-O-TiTi-O-Na Ti-O

7、-TiTi-OH2021-11-1611 TG-MS and SEMSEM image of sample A after it was directly treated with 10M HCl solution withou washing with DWgranular partiles2021-11-1612 HypothesisNaOH+H2O+TiO2Na+-O-Ti bonds -structuresTi-OHBondsnanosheetsDWHClTi-O-Ti Ti-OH-O-TiHClTiO2nanoparticlesTiO2nanotubes2021-11-1613 Sy

8、nthesis of H2Ti3O7 nanotubeAdv.Mater.200280-200nmanataseTiO2treatmentwith 10MNaOH(T t)washedfilteredwith DWH2Ti3O7 nanotubes 130、72h2021-11-1614raw material：anatase TiO2, TiO2 made by Sol- gel, amorphous TiO2 .reaction time with NaOH：12、24、48 and 72h .Treatment with NaOH：NaCl、NaNO3、 LiOH(nanoparticl

9、e)、KOH(nanorod) .Washing with water：ethanol、acetone .Treatment with HCl：with and without . experiments2021-11-1615Both EDX and EESL spectra show merely Ti and O, only when the examination area was increased to co- ver some non-tubular particles, Na was detected.Infrared spectroscopy of the specimen

10、indicates that OH bonds constantly exist in the nanotubes, implying that the nanotubes might be the H-form of titanates rather than titania. characterization-EDX、EESL、IRS2021-11-1616 characterizationXRD、SAEDXRD patterns of a) anatase TiO2 , b) H2Ti3O7 nanotube and c) simulated using proposed nanotub

11、e model.2021-11-1617 characterization-HRTEMHRTEM image of H2Ti3O7 nanotube. a) scar bar:6nm, (010) 0.37nm. b) scroll structure, scar bar:3nm, (200) 0.78nm.2021-11-1618 formation mechanism Scheme of two most probable formation mechanism of the H2Ti3O7 nanotubes .Ti3O72-Na2Ti3O72021-11-1619XRD：prepara

12、tionHRTEMTGA：0.8H2OXRD：thermal treatmentNMR：proton and trapped water H2Ti3O70.8H2O nanotubesJ.Phys.Chem.2005Rutile-type TiO2treatment with 10M NaOHDW washing utill neutral2 or 4 HCl/H2O washing24h、72h150oC2021-11-1620The driving force of the rolling has been discussed by using a computer simulation

13、method . formation mechanismNaOH+TiO2amorphous phasemultilayer Na2Ti3O7sheetsTi3O72-nanotubesNa+/H+HClH2Ti3O70.8H2O2021-11-1621 mechanism-driving forceNa2Ti3O7 nanosheetsScheme of the driving force of bending single titanate nanosheets Adv.Mater.20062021-11-1622 mechanism-driving forceNa2Ti3O7 nanosheetsScheme of the driving force of bending multilayered titanate nanosheets 2021-11-1623 mechanism-driving forceNa2Ti3O7 nanosheetsScheme of the stablization of curved multilayered nanosheets due to the periodic potential