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  • Title: Simultaneous Tuning Band Gaps of Cu2 O and TiO2 to Form S-Scheme Hetero-Photocatalyst.
    Author: Qi L, Wang M, Xue J, Zhang Q, Chen F, Liu Q, Li W, Li X.
    Journal: Chemistry; 2021 Oct 21; 27(59):14638-14644. PubMed ID: 34382276.
    Abstract:
    Photocatalytic Z or S scheme merits higher redox potentials and faster charge separation. However, heterostructure photocatalysts with band gaps of bulk materials often have a type I band structure leading to poor photocatalytic activity. In view of this, we report simultaneous tuning of band gaps of Cu2 O and TiO2 , where quantum dot Cu2 O nanoparticles were formed on doped TiO2 with Ti3+ . The reduced size of Cu2 O made its conduction band more negative, whereas the introduction of Ti3+ made the absorption edge red shift to the visible light region. The as-formed heterostructure enabled an S-Scheme mechanism with remarkable activity and stability for visible light photodegradation of 4-chlorophenol (4-CP). The as-obtained photocatalysts' activity demonstrated ca. 510-fold increase as compared to individual ones and a mechanical blend. The as-obtained photocatalysts maintained over 80 % for 5 cycles and 2 months exposure to O2 did not decrease the degradation rate. ESR characterization and scavenger experiments proved the S-Scheme mechanism.
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