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Tạp chí quốc tế 2020
Số tạp chí 2020(2020) Trang: ID 6684791 (1-12)
Tạp chí: Journal of Nanomaterials

In this work, heterostructured catalyst Al2TiO5/TiO2 (ATO/Ti) was synthesized by a two-step method: low-temperature sol-gel process along with hydrothermal treatment in a neutral medium. Characteristics of the fabricated catalyst were analyzed by various techniques including X-ray diffraction, Fourier transform infrared spectroscopy, Brunauer-Emmett-Teller adsorption, UV-Vis diffuse reflectance spectroscopy, energy-dispersive X-ray spectroscopy, field emission scanning electron microscopy, transmission electron microscopy, Raman spectroscopy, and the point of zero charges. The content of ATO in ATO/Ti catalysts strongly affected the photocatalytic degradation of cinnamic acid (CA). The 33% ATO contained 33ATO/Ti catalyst exhibited the highest activity for the removal of CA. Compared with the bare TiO2 synthesized in water (TiO2(w)) as well as Al2TiO5 (ATO), the hybrid 33ATO/Ti catalyst exhibited enhanced photocatalytic activity in the CA degradation under ultraviolet light. The enhancement in the catalytic activity of ATO/Ti could be related to the increase of the specific surface area and the reduction of bandgap energy obtained from the hybridization of TiO2(w)and ATO. The factors as the catalyst dosage (Ccat), the airflow rate (Qair), and the solution initial pH (pH) affected the CA removal efficiency were studied on 33ATO/Ti catalyst. The optimum condition for photodegradation efficiency of CA was found to be at Ccat = 0.75 gL-1, Qair = 0.3 Lmin-1, and pH = 3.8. The highest 60-minute removal efficiency of CA reached 77.1% on 33ATO/Ti, while the CA conversion was 67.1% on TiO2(w) and 30.4% on ATO. The recyclability of the 33ATO/Ti was also measured at the optimal parameters. A significant decrease in the CA conversion of 35% after 6 continuous cycles.

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