Adsorption and photodegradation behaviors of in-situ growth TiO2 films with various nano-structures

Photocatalytic and Antimicrobial Properties of Electrospun TiO2–SiO2–Al2O3–ZrO2–CaO–CeO2 Ceramic Membranes

“…Also, the number of peaks was highly increased with the increase of calcination temperature to 850 °C, and rutile phase formation started to occur (Figure e). The peaks were reached at 2θ values of 27.5, 36.2, 41, 54.6, 64, and 69.1° represented (110), (101), (111), (211), (310), and (301) planes of the rutile phase. ,− Moreover, the peak at the 2θ value of 32° belongs to the brookite phase of TiO 2 . The lack of any other phase except TiO 2 for the calcined membranes demonstrated that the dopants were well dispersed in the TiO 2 lattice.…”

“…Since the amorphous TiO 2 enables electron–hole recombination on the surface easily, TiO 2 in the anatase phase is considered to show higher photocatalytic activity than TiO 2 in an amorphous structure. 61 On the other hand, the nanofiber membrane calcined at 850 °C has the lowest adsorption capacity and photocatalytic degradation efficiency compared to other calcined membranes due to having the lowest surface area and the rutile phase structure. These results revealed that both the crystalline structure and surface area played a significant role in determining the photocatalytic efficiency of the fabricated nanofiber materials.…”

“…On the other hand, photocatalytic activity depends on not only the surface area but also the structural, morphological, and optical properties of nanomaterials. Since the amorphous TiO 2 enables electron–hole recombination on the surface easily, TiO 2 in the anatase phase is considered to show higher photocatalytic activity than TiO 2 in an amorphous structure . On the other hand, the nanofiber membrane calcined at 850 °C has the lowest adsorption capacity and photocatalytic degradation efficiency compared to other calcined membranes due to having the lowest surface area and the rutile phase structure.…”

“…Therefore, the superoxide anion radicals and hydroxyl radicals, which were generated from electron (e−)-hole (h+) coupled reaction with oxygen and water, ensured the possibility of reaching a higher degradation ratio for MB molecules. 21 , 61 After the adsorption–desorption process was completed, the photocatalytic performances of the nanofiber membranes were investigated by opening UV and sunlight resources for 90 min of exposure time on the samples. As can be seen in Figure 7 , the maximum degradation efficiency was achieved with the ceramic nanofiber material calcined at 650 °C under UV light (90.7%), while it was achieved with the sample calcined at 750 °C under simulated sunlight irradiation (88.5%).…”

“…The adsorption step is the essential process for heterogeneous photocatalysis that stimulates the interaction between dye molecules and photocatalysts, and thus, the degradation of the adsorbed dye molecules on the photocatalyst surface could be realized more easily. , The high adsorption capacity of the fabricated nanofiber membranes indicated that a large amount of MB dye molecules were exhibited on the surface. Therefore, the superoxide anion radicals and hydroxyl radicals, which were generated from electron (e−)-hole (h+) coupled reaction with oxygen and water, ensured the possibility of reaching a higher degradation ratio for MB molecules. , After the adsorption–desorption process was completed, the photocatalytic performances of the nanofiber membranes were investigated by opening UV and sunlight resources for 90 min of exposure time on the samples. As can be seen in Figure , the maximum degradation efficiency was achieved with the ceramic nanofiber material calcined at 650 °C under UV light (90.7%), while it was achieved with the sample calcined at 750 °C under simulated sunlight irradiation (88.5%).…”