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Constructing TiO 2 @MOF S-scheme heterojunctions for enhanced photocatalytic degradation of antibiotics and Cr(VI) photoreduction.

Yuqi WanKe GaoZhiquan PanTianshuo ZhaoQingrong Cheng
Published in: Dalton transactions (Cambridge, England : 2003) (2024)
The residue of antibiotics and various pollutants has led to an urgent issue in environmental pollution control. In this study, we constructed an S-scheme P-TiO 2 @Zn-MOF heterojunction by self-assembling phosphonate-based MOFs on mesoporous phosphate-TiO 2 beads. Compared to monomers, the P-TiO 2 @Zn-MOF 2.0 heterojunction exhibits significantly higher photocatalytic activity for the photo-oxidative degradation of ciprofloxacin (97.2% in 60 min) and tetracyclic (TC) (94.5% in 100 min) and the photo-reduction of Cr(VI) (92.7% in 60 min) under simulated sunlight. Experimental results and calculations revealed the effective separation and transfer of photogenerated carriers at the P-TiO 2 @Zn-MOF 2.0 S-scheme heterojunction interface, enabling the formation of highly active superoxide and hydroxyl radicals. Furthermore, the hybrid maintained excellent Cr(VI) photoreduction performance after recycling tests in actual electroplating industry wastewater at a strongly acidic pH.
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