Abstract
AbstractSensitized kaolinite with improved visible‐light catalytic activity was prepared via a facile in‐situ growth of nanosized Cu‐TiO2 on the surface of the sulfated kaolinite impregnated in Cu‐TiO2 sol. The as‐prepared photocatalysts were characterized in terms of various techniques. The transmission electron microscope and energy dispersive spectrometer results revealed that Cu‐TiO2 could grow on the surface of the pretreated kaolinite and the aggregation of Cu‐TiO2 was successfully inhibited. The X‐ray photoelectron spectrum confirmed the formation of AlOTi bonds between Cu‐TiO2 and sulfated kaolinite in the sensitized kaolinite composite. The sensitized kaolinite composite exhibited significantly improved performance in the degradation of Rhodamine B (RhB), leading to about 87% of RhB degradation in 180 min, which is superior to that of the kaolinite, calcined kaolin, and sulfated calcined kaolin under visible‐light irradiation. The superior photodegradation activity of the sensitized kaolinite composite was primarily attributed to the synergetic effect of Cu‐TiO2 sensitization and sulfation, resulting from the efficient transfer and separation of the photo‐induced charge carriers between Cu‐TiO2 and kaolinite.
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