Influence of different aluminum salts on the photocatalytic properties of Al doped TiO2 nanoparticles towards the degradation of AO7 dye

Abstract

Three kinds of Al-TiO2 samples and pure TiO2 samples were synthesized via a modified polyacrylamide gel route using different aluminum salts, including Al2(SO4)3∙18H2O, AlCl3, and Al(NO3)3∙9H2O under identical conditions. The influence of different aluminum salts on the phase purity, morphologies, thermal stability of anatase and photocatalytic properties of the as-prepared Al-TiO2 nanoparticles were studied. The energy gap (Eg) of Al-TiO2 nanoparticles decreases due to Al ion doping into TiO2. The photocatalytic activities of the Al-TiO2 samples were investigated by the degradation of acid orange 7 dye in aqueous solution under simulated solar irradiation. The Al-TiO2 nanoparticles prepared from Al(NO3)3∙9H2O exhibit the best photocatalytic activity among the four kinds of samples, followed in turn by the Al-TiO2 nanoparticles prepared with AlCl3, Al2(SO4)3∙18H2O and pure TiO2. The different performances are attributed to complex effects of Eg, particle size, surface morphology, phase purity and the defect sites of the Al-TiO2 nanoparticles.

Absorption and Remission Characterization of Pure, Dielectric (Nano-)Powders Using Diffuse Reflectance Spectroscopy: An End-To-End Instruction

“…Taking scattering and absorption coefficients into account allows to calculate the diffuse reflectance as a function of wavelength. For rutile-phase TiO 2 , the simulated diffuse reflectance spectrum shows significant resemblance to data coming from both literature [188,189] and present measurements as it is shown in Figure 18. Throughout the visible range above 450 nm, the absorption remains nearly fully wavelengthindependent and only appears to grow in the infrared spectral region.…”

Photocatalytic performance of Al and Nb‐doped TiO2nanoparticles prepared by microwave‐assisted hydrothermal method

“…In da Silva et al 68 and Hirano and Matsushima 69 100% discoloration of the MB dye was reached, but the time was much longer than that used in this work, such as 150 and 300 min. For Al-TiO 2 , the work by Luo et al 70 shows almost 100% discoloration of acid orange 7 in 120 min of photocatalytic process, indicating a longer time than that found in this work. The other works, shown in Table 4, show lower bleaching efficiencies than what was found in this work.…”

Enhancement of the photovoltaic performance of perovskite solar cells via sono‐synthesis of Al‐doped TiO 2 as the electron transport layer

“…77 The O 1s peak at binding energies of 530.11 and 531.03 eV is attributed to the oxygen bonding with Al and titanium and hydrated bonding, respectively. 78 According to Figure 6C-F and also Figure 6E, the presence of a peak at ~75 eV confirms the Al element in the form of Al 3+ in the c-TiO 2 thin film. 79 As previously studied by Tsai et al, 80 doping Al in the crystalline structure of titanium oxide reduces Ti 4+ to Ti 3+ .…”

“…Also, the presence of a peak in the binding energy of 460.25 eV could be related to Ti 3+ 77 . The O 1s peak at binding energies of 530.11 and 531.03 eV is attributed to the oxygen bonding with Al and titanium and hydrated bonding, respectively 78 . According to Figure 6C‐F and also Figure 6E, the presence of a peak at ~75 eV confirms the Al element in the form of Al 3+ in the c‐TiO 2 thin film 79 .…”