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Acceleration of Singlet Oxygen Evolution by Sonopiezoelectric Charge Transfer Over SrTiO3-TiO2 Heterojunction for
Weiwei Wang1, Chun Lu1, Xiaoxiao Liu1
1School of Environmental Science and Engineering Nanjing Tech University Nanjing People's Republic of China.
Abstract:
Sonopiezo-mediated heterogeneous catalysis is a promising technology for efficient removal of organic pollutants from wastewater. Nevertheless, it is challenging in real water matrix with coexisting ions due to the rather-limited selectivity of reactive oxygen species if any. Herein, a sonopiezo-triggered singlet oxygen evolution system for selective removal of tetracycline hydrochloride (TCH) was rationally designed by SrTiO3-TiO2 heterojunction with a TiO2-terminated SrTiO3 S-scheme interfacial structure. SrTiO3-TiO2 heterojunction exhibits a dramatically expanded piezoelectric constant (d 33), which produces a synergistic effect on improving the separation and transfer efficiency of charge carrier for efficient TCH degradation. Moreover, SrTiO3-TiO2 heterojunction presents a high sonopiezo-current, which attractively indicates that SrTiO3-TiO2 heterojunction has a potential capacity of charge separation under sonopiezo initiation. Remarkably, the mechanism was identified as the continuous generating of singlet oxygen (1O2), in which the sonopiezo-generated electrons trigger the formation of superoxide anion radical (•O2 -) and its subsequent transformation to generate 1O2 by expending more sonopiezo-generated holes. These findings provided new insights towards developing nonradical system for effective and selective oxidation of electron-rich pollutants via sonopiezo-catalytic process.
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