Ti2 O3 /TiO2-assisted solar photocatalytic degradation of 4-tert-butylphenol in water


Mergenbayeva S. Atabaev T.Sh. Poulopoulos S.G.
November 2021MDPI

Catalysts
2021#11Issue 11

Colored Ti2 O3 and Ti2 O3 /TiO2 (mTiO) catalysts were prepared by the thermal treatment method. The effects of treatment temperature on the structure, surface area, morphology and optical properties of the as-prepared samples were investigated by XRD, BET, SEM, TEM, Raman and UV–VIS spectroscopies. Phase transformation from Ti2 O3 to TiO2 rutile and TiO2 anatase to TiO2 rutile increased with increasing treatment temperatures. The photocatalytic activities of thermally treated Ti2 O3 and mTiO were evaluated in the photodegradation of 4-tert-butylphenol (4-t-BP) under solar light irradiation. mTiO heated at 650◦ C exhibited the highest photocatalytic activity for the degradation and mineralization of 4-t-BP, being approximately 89.8% and 52.4%, respectively, after 150 min of irradiation. The effects of various water constituents, including anions (CO2− 3, NO3, Cl and HCO−3) and humic acid (HA), on the photocatalytic activity of mTiO-650 were evaluated. The results showed that the presence of carbonate and nitrate ions inhibited 4-t-BP photodegradation, while chloride and bicarbonate ions enhanced the photodegradation of 4-t-BP. As for HA, its effect on the degradation of 4-t-BP was dependent on the concentration. A low concentration of HA (1 mg/L) promoted the degradation of 4-t-BP from 89.8% to 92.4% by mTiO-650, but higher concentrations of HA (5 mg/L and 10 mg/L) had a negative effect.

4-tert-butylphenol , Degradation , Mineralization , Solar photocatalysis , Ti2 O3 /TiO2

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Department of Chemical and Materials Engineering, School of Engineering and Digital Sciences, Nazarbayev University, 53 Kabanbay Batyr Ave., Nur-Sultan, 010000, Kazakhstan
Department of Chemistry, School of Sciences and Humanities, Nazarbayev University, Nur-Sultan, 010000, Kazakhstan

Department of Chemical and Materials Engineering
Department of Chemistry

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