Disappears in be attributed attributed of Ni ions adsorbed on the surface of TiO2, which

Disappears in be attributed attributed of Ni ions adsorbed on the surface of TiO2, which TiO2 , which disappears within the ultraviolet area. Compared with NiO/Ti-100C sample,NiO/Ti-500C the ultraviolet region. Compared with NiO/Ti-100C sample, the peak on the the peak in the NiO/Ti-500C sample attributed the species of NiO [27]. In contrast for the above samsample at 720 nm could be at 720 nm can be attributed the species of NiO [27]. In contrast to thethe NiO/Ti-600C the NiO/Ti-600C sample shows new peaks at wavelengths 450, ples, above samples, sample shows new peaks at wavelengths 450, 511, and 743 nm, 511, and 743 nm, whichthe NiTiO3 phase [379]. The phase [379]. and 511 nm are 450 that are attributed to are attributed towards the NiTiO3 spectra at 450 The spectra at due 2 and 511 nm areof the crystal field ofof the crystal field of ions3d8 band sub-bands, named towards the splitting as a result of the splitting the 3d8 band of Ni2 the into two of Ni ions into two Ti4 charge transfer (CT) bands. In addition, it shows absorbance at two Ti4 charge transfer (CT) bands. Additionally, it shows absorbance at 743 nm as indicated by Ni2 sub-bands, referred to as Ni 743yellow indicated by Y-27632 manufacturer itsreduction catalysts were also characterized by the UV-vis diffuse its nm as color [38]. The yellow colour [38]. The reduction catalysts were also characterized by the UVspectrum shown in Figure 1B. The peaksin Figure 1B. The peaks of NiTiO3 and reflection -vis diffuse reflection spectrum shown of NiTiO3 and NiO disappear, indicatNiO disappear, indicating that NiO and NiTiO3 are totally lowered to Ni0 . The above ing that NiO and NiTiO3 are completely lowered to Ni0. The above observations clearly observations clearly indicate that the interaction in between Ni species as well as the help TiO2 indicate that the interaction among Ni species as well as the assistance TiO2 progressively increases progressively increases with the raise of calcination temperature, resulting in the evolution with the increase of calcination temperature, resulting in the evolution of Ni species from of Ni species from Ni2 species adsorbed around the surface on the carrier to NiO species, and Ni2 species adsorbed on the surface of the carrier to NiO species, and after that to NiTiO3 spithen to NiTiO3 spinel species. nel species.(A)(B)NiO/Ti-800C NiO/Ti-700C NiO/Ti-600C NiO/Ti-500C NiO/Ti-100CKubelka-Munk (a.u.)Kubelka-Munk (a.u.)450nm 511nm743nm450nm 511nmNi/Ti-800R Ni/Ti-700R Ni/Ti-600R Ni/Ti-500R743nm720nm720nmWavelength (nm)Wavelength (nm)Figure 1. UV-vis diffuse reflection spectrum with the samples annealing (A) Figure 1. UV-visdiffuse reflection spectrum in the samples annealing (A) and cut down (B).We turned to the XRD to additional identify the bulk composition and also the average We turned to the XRD to additional ascertain the bulk composition plus the typical crystallite size of your above catalysts. The XRD patterns for the assistance and samples prior to crystallite size on the above catalysts. The XRD patterns for the support and samples just before and right after reduction are shown in Figure 2A,B, along with the calculated typical crystallite size is and just after reduction are shown in Figure 2A,B, along with the calculated average crystallite size listed in Table 1. The anatase (JCPDS#21-1272) andand rutile (JCPDS#21-1276) -AG 99 Autophagy structure exis listed in Table 1. The anatase (JCPDS#21-1272) rutile (JCPDS#21-1276) structure existed in all samples. On the other hand, the face-centered cubic cubic of structure(JCPDS#47-1049) only isted in all samples. Nevertheless, the face-centered of structure NiO NiO (JCP.