Details

Autor(en) / Beteiligte

• Dai, Benlin
• Chen, Xin
• Yang, Xiaofan
• Yang, Gang
• Li, Shijie
• Zhang, Lili
• Mu, Feihu
• Zhao, Wei
• Leung, Dennis Y.C.

Titel

Designing S-scheme Au/g-C3N4/BiO1.2I0.6 plasmonic heterojunction for efficient visible-light photocatalysis

Ist Teil von

• Separation and purification technology, 2022-04, Vol.287, p.120531, Article 120531

Ort / Verlag

Elsevier B.V

Erscheinungsjahr

2022

Link zum Volltext

Quelle

Alma/SFX Local Collection

Beschreibungen/Notizen

• Herein, a novel Au/g-C3N4/BiO1.2I0.6 plasmonic heterojunction was constructed for the first time, which can efficiently degrade BPAF and reduce Cr(VI) through the S-scheme mechanism under visible light irradiation. [Display omitted] •The Au/g-C3N4/BiO1.2I0.6 plasmonic photocatalyst was constructed for the first time.•This photocatalyst showed excellent activity for BPAF degradation and Cr(VI) reduction.•The high activity was caused by rapid electron transfer, LSPR, and S-scheme system.•The S-scheme mechanism was confirmed by IEF and band offsets. A novel S-scheme Au/g-C3N4/BiO1.2I0.6 plasmonic heterojunction was constructed by calcining a mixture of flower-like BiOI and Au/g-C3N4 nanosheets for the first time. This Au/g-C3N4/BiO1.2I0.6 heterojunction exhibited excellent photocatalytic activity in bisphenol AF (BPAF) degradation and Cr(VI) reduction with high cycle stability under visible light irradiation. In particular, the photocatalytic performance of the optimum material developed (4-Au/g-C3N4/BiO1.2I0.6) can reach 0.0174 min−1 (apparent rate of BPAF degradation) and 0.0204 min−1 (apparent rate of Cr(VI) reduction), which were 6.5 and 3.7 times that of pristine g-C3N4, respectively. The high photocatalytic performance was due to the high efficiency of charge separation, the excellent light absorption of localized surface plasmon resonance (LSPR) caused by the Au deposition, and the formation of S-scheme heterojunctions, which maintained strong photocatalytic reduction and oxidation activity. Noticeably, the charge density difference and band offsets of the g-C3N4/BiO1.2I0.6 were calculated. The results revealed that an internal electric field (IEF) was created, which further demonstrated the formation of an S-scheme photocatalytic mechanism.