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Hybridization of SrTiO3 and strontium wolframates with very-high-potential photogenerated carriers for degrading the A-ring of tetracycline

Degrading the A-ring of tetracycline (TC) requires a photocatalyst with either a very negative conduction band edge (CBE) or a very positive valence band edge (VBE). In this work, a SrTiO3-based composite with a Sr/W ratio of 7.5% (CSWT75) was prepared by hybridizing the following components: n-type semiconductor Sr2WO5 with CBE of ?2.10?V, n-type semiconductor SrWO4 with a VBE of 4.42?V, and p-type semiconductor Sr3WO6 with CBE of?1.26?V, resulting in formation of z-scheme and p-n heterojunctions. Over CSWT75, the photodegradation rate of the B, C, and D rings of TC was 100% in 60?min and that of A ring was 98% in 90?min. The reaction rate constant of CSWT75 was found to be 3.4-fold that of the as-prepared pure SrTiO3. It is found that a high positive VBE potential like that of SrWO4 4.42?V is more effective on degrading A-ring than a negative CBE potential ?0.81 of SrTiO3, but less effective than a negative CBE potential ?1.26?V of Sr3WO6. This study identified two new semiconductors with highly negative CBEs. This work also implys that a z-scheme structured composite hybridizing homeotype-semiconductors with very negative CBE favors in degrading A ring of TC.

» Author: Mingjie Zheng, Zhixing Chen, Yongkun Lun, Bin Liu, Wangjian Zhai, Qinyu He

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