Nanoarchitectonics of S-scheme CdS-SH QDs/Bi2MoO6 heterojunction for boosted photocatalytic lignin biomass conversion: Interplay of singlet oxygen and interfacial engineering

被引:0
作者
Liang, Jiangyushan [1 ]
Labidi, Abdelkader [1 ]
Lu, Baoyang [2 ]
Patrocinio, Antonio Otavio T. [3 ]
Sial, Atif [1 ]
Gao, Ting [1 ]
Othman, Sarah I. [4 ]
Allam, Ahmed A. [5 ]
Wang, Chuanyi [1 ]
机构
[1] Shaanxi Univ Sci & Technol, Sch Environm Sci & Engn, Xian 710021, Peoples R China
[2] Jiangxi Sci & Technol Normal Univ, Flexible Elect Innovat Inst, Jiangxi Prov Key Lab Flexible Elect, Nanchang 330013, Jiangxi, Peoples R China
[3] Univ Fed Uberlandia, Lab Photochem & Mat Sci, LAFOT CM, BR-38400902 Uberlandia, MG, Brazil
[4] Princess Nourah bint Abdulrahman Univ, Coll Sci, Dept Biol, POB 84428, Riyadh 11671, Saudi Arabia
[5] Imam Mohammad Ibn Saud Islamic Univ, Coll Sci, Dept Biol, Riyadh 11623, Saudi Arabia
来源
APPLIED CATALYSIS B-ENVIRONMENT AND ENERGY | 2025年 / 367卷
基金
中国国家自然科学基金;
关键词
Lignin biomass conversion; Singlet oxygen; Photocatalysis; S -scheme heterojunction; Value-added chemicals; OXIDATION; DEPOLYMERIZATION; NANOPARTICLES; NANOSHEETS;
D O I
10.1016/j.apcatb.2025.125092
中图分类号
O64 [物理化学(理论化学)、化学物理学];
学科分类号
070304 ; 081704 ;
摘要
Photocatalytic depolymerization of lignin biomass into high-quality fuels and value-added chemicals shows great potential for environmental protection. However, its efficiency is affected by stringent depolymerization conditions and a complex depolymerization process. Herein, CdS-SH QDs/Bi2MoO6 S-scheme heterojunctions with strong interfacial interactions were successfully fabricated trying to give a "fatal blow" to the crucial C beta-O bond in lignin. The formation of Bi-S bonds at the interface enhances the activation of photogenerated charge carriers, leading to the production of singlet oxygen (1O2), which effectively reduces the bond energy of C beta-O bonds in lignin. On the optimized composite photocatalyst, the total conversion of PP-ol was about 100 % with rising oxygen concentration, and phenol and acetophenone (AP) were the main products with yields of 90 % and 93 %, respectively. By cleaving the C beta-O bond of alkali lignin isolated from Pinus massoniana under air, the yield of vanillin at CdS-SH QDs/Bi2MoO6 was 26.6 mg/glignin, which was 70 and 3.52 folds higher than that of Bi2MoO6 and CdS-SH QDs, respectively. Density-functional theory (DFT) calculations, in-situ X-ray photoelectron spectroscopy (XPS) and in-situ electron paramagnetic resonance (EPR) evidenced the S-scheme charge migration pathways in CdS-SH QDs/Bi2MoO6 during the photocatalytic reaction. This work provides a new perspective on designing photocatalysts capable of efficiently depolymerizing lignin in real environments.
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页数:12
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