Citation: Xinxin Liang, Yongqian Cui, Qingyun Tian, Tingting Jia, Qibing Dong, Ximing Li, Ting Gao, Chao Ma, Chuanyi Wang. Photoreforming polylactic acid plastics into pyruvate over CdS/Bi₄Ti₃O₁₂ S-scheme heterojunction: Successive removal of hydrogen from α-C[J]. Chinese Chemical Letters, ;2026, 37(2): 111097. doi: 10.1016/j.cclet.2025.111097 shu

Photoreforming polylactic acid plastics into pyruvate over CdS/Bi₄Ti₃O₁₂ S-scheme heterojunction: Successive removal of hydrogen from α-C

Xinxin Liang ^a ,
Yongqian Cui ^a ,
Qingyun Tian ^a ,
Tingting Jia ^a ,
Qibing Dong ^a ,
Ximing Li ^a ,
Ting Gao ^a ,
Chao Ma ^a ,
Chuanyi Wang ^{a, b, *,}

a.
School of Environmental Science and Engineering, Shaanxi University of Science and Technology, Xi'an 710021, China
b.
Jiangxi Key Lab of Flexible Electronics, Flexible Electronics Innovation Institute, Jiangxi Science and Technology Normal University, Nanchang 330013, China

wangchuanyi@sust.edu.cn

Received Date: 1 December 2024
Revised Date: 27 January 2025
Accepted Date: 16 March 2025
Available Online: 17 March 2025

Figures(4)

Photoreforming poly(lactic acid) (PLA) plastics into pyruvic acid (PA) coupled with hydrogen evolution is of great significance for sustainable development. However, a significant challenge lies in α-OH bond cleaving of lactic acid (LA). Herein, CdS/Bi₄Ti₃O₁₂ composite is fabricated, bridged by Bi−S bonds, through in-situ growth of CdS nanoparticles on Bi₄Ti₃O₁₂ nanoflowers for the successive removal of hydrogen from α-C in LA. In-situ X-ray photoelectron spectroscopy confirms the S-scheme carriers transfer route and interfacial Bi−S bond in CdS/Bi₄Ti₃O₁₂. Consequently, the photo-electrons and holes with extended lifetimes and strong redox potential accumulate in the CdS conduction band and Bi₄Ti₃O₁₂ valence band, respectively, as evidenced by in-situ electron spin resonance and time-resolved photoluminescence. This facilitates the generation of ^•OH radicals, which further participate in the successive dehydrogenation reaction of LA. Consequently, the photoreforming efficiencies of converting PLA into PA and H₂ by CdS/Bi₄Ti₃O₁₂ are 1.7 and 3.16 mmol g^–1 h^–1, which are respectively 2.8 and 22 times higher than that by pristine Bi₄Ti₃O₁₂. The present work provides a new approach for designing S-scheme to achieve hydrogen production and value-added conversion of plastics.
- H₂ evolution,
- S-scheme,
- Photoreforming plastic,
- Valuable chemical,
- Plastic oxidation
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通讯作者: 陈斌, bchen63@163.com

Photoreforming polylactic acid plastics into pyruvate over CdS/Bi₄Ti₃O₁₂ S-scheme heterojunction: Successive removal of hydrogen from α-C