β particles induced directional inward migration of oxygen vacancies: Surface oxygen vacancies and interfacial oxygen vacancies synergistically activate PMS
β particles induced directional inward migration of oxygen vacancies: Surface oxygen vacancies and interfacial oxygen vacancies synergistically activate PMS
复制标题
DOI：
10.1016/j.apcatb.2022.121879
复制
发表时间：
2022-08
期刊：
影响因子：
--
通讯作者：
Xinyu Hu;Juntao Wang;Jing Wang;Yao-Hua Deng;Huidi Zhang;Tao Xu;Wen-lei Wang
中科院分区：
文献类型：
--
作者：
Xinyu Hu;Juntao Wang;Jing Wang;Yao-Hua Deng;Huidi Zhang;Tao Xu;Wen-lei Wang
在这项工作中，利用高能β电子束促进表面氧缺陷的产生和定向内向迁移。由于BiVO4/Bi2O3−x表面氧空位的转移，价带电位转变为高电位。界面氧空位在诱导氧空位能级的形成和降低带隙能量方面具有显著的优势。表面氧空位和空位水平可以阻止光生载流子的重组。富集在表面氧空位的电子可以显著激活带有O - O键的PMS，从而降解环丙沙星（CIP）。BiVO4/Bi2O3−x-450/PMS的降解动力学常数和CIP矿化率分别比BiVO4/Bi2O3−x/PMS高2.09倍和1.51倍。表面氧空位相对含量较低（24.70%）的BiVO4/Bi2O3−x-450具有较强的活化能力。显然，界面氧空位引起的能带结构变化是PMS光活化效率提高的原因。
In this work, a high-energy β electron beam was applied to promote the generation and directional inward migration of surface oxygen defects. The valence band potential changed to a high potential due to the transfer of surface oxygen vacancies on BiVO4/Bi2O3−x. Interface oxygen vacancies have significant advantages in inducing the formation of oxygen vacancy levels and reducing the band gap energy. Surface oxygen vacancy and vacancy levels can prevent the recombination of photogenerated carriers. The electrons enriched in the surface oxygen vacancies can remarkably activate PMS with O−O bonds to degrade ciprofloxacin (CIP). The degradation kinetic constant and CIP mineralization rate of BiVO4/Bi2O3−x-450/PMS were 2.09 and 1.51 times higher than those of BiVO4/Bi2O3−x/PMS, respectively. BiVO4/Bi2O3−x-450 with a lower relative content of surface oxygen vacancies (24.70%) exhibited a stronger activation ability. Obviously, the change of band structure caused by interface oxygen vacancies is the reason for increasing photoactivation efficiency of PMS.