Typical Synthesis and Environmental Application of Novel Ti Nanoparticles - Advanced Materials for Agriculture, Food and Environmental Safety - page 431

Figure 15.8 (a) TEM images of CNT1 (inset: Particle size distribution histogram); (b)
SEAD pattern of CNT1; (c) Mesoporous structures of CNT1 observed from HRTEM; (d)
SEM images of CNT1.
scanning electron microscopy (SEM) of CNT1. h e average grain sizes of
CNT1 are ~15 nm measured from SEM. h erefore, Figure 15.8 concludes
that the synthesized materials are in nanometer range and developed
mesoporous characters. During annealing, the decomposition of CNT
powders is obtained from edteH 4 in methanol and its complexes precur-
sor solutions, and i nally gets mesoporous clusters of CNT. h e N 2 adsorp-
tion-desorption isotherms of CNT1 nanopowders indicate the type IV
nature of the curve, which is characteristic of a mesoporous material. h e
material possesses a high BET surface area of ~162m 2 g −1 with a single
point pore volume of 0.159 ml g −1 at p / p o = 1.
In order to obtain some information on the potential application of
CNT1 in photocatalysis, UV-Vis spectra were done. h e changes in con-
centration of RhB as a function of UV-light exposure time in the presence
of the prepared photocatalysts are shown in Figure 15.9. h e photocatalytic
activity of CNT1 (27.31×10 -3 min -1 ) is 2.5 times higher than that of pure
TiO 2 (11.68×10 -3 min -1 ) and other compositions of Cr x Nb x Ti 1-2x O 2-x/2 under
UV light (Table 15.1). An increase of the dif erent dopant (Cr and Nb) con-
centrations in TiO 2 solid solution, decreased the rate of photodegradation