Hybridization of SrTiO3 and strontium wolframates with very-high-potential photogenerated carriers for degrading the A-ring of tetracycline
Hybridization of SrTiO3 and strontium wolframates with very-high-potential photogenerated carriers for degrading the A-ring of tetracycline
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DOI：
10.1016/j.apsusc.2021.151138
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发表时间：
2021-12
影响因子：
6.7
通讯作者：
Mingjie Zheng;Zhixing Chen;Yongkun Lun;Bin Liu;Wangjian Zhai;Qinyu He
中科院分区：
文献类型：
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作者：
Mingjie Zheng;Zhixing Chen;Yongkun Lun;Bin Liu;Wangjian Zhai;Qinyu He
降解四环素(TC)的A环需要具有非常负的导带边(CBE)或非常正的价带边(VBE)的光催化剂。在本工作中，通过将n型半导体Sr2WO5的CBE为-2.10 n型、n型半导体SrWO4的VBE为4.42 nV和p型半导体Sr3WO6的cBE为-1.26 nV进行混合，制备了锶/钨比为7.5%(CSWT75)的SrTiO_3基复合材料，形成了z-晶型和p-n异质结。在CSWT75上，TC的B、C、D环在60min时的光降解率为100%，A环在90min时的光降解率为98%。结果表明，CSWT75的反应速率常数是纯SrTiO_3的3.4倍。结果表明，在较高的正VBE电势下，如SrWO44.42nV，对A环的降解效果优于负CbE电势−为0.81的SrTiO3，但不如负CbE电势−1.26nV。这项研究确定了两种新的具有高度负CBE的半导体。这项工作还表明，与同型半导体杂化的Z方案结构复合材料具有非常负的CBE，有利于降解TC的A环。
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 Sr2WO5with CBE of –2.10 V, n-type semiconductor SrWO4with a VBE of 4.42 V, and p-type semiconductor Sr3WO6with 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 SrWO44.42 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.