Construction of Sulfur-Vacancy-Modified 0D/2D S-Scheme Heterojunction for Enhancing Photocatalytic Cr(VI) Reduction
Jie He, Lin Liu, Ning Fu, Yarong Zhao, Linlin Zhang, Lele Feng, Guixiang Teng, Xingang Li, Chun Zhang
Abstract
The rational design and construction of S-scheme heterojunctions represent an effective strategy for enhancing the photocatalytic efficiency. Nevertheless, the challenge of enabling efficient charge migration at the interface persists. Herein, a 0D/2D S-scheme heterojunction photocatalyst incorporating 0D Ag quantum dots and S-vacancy-modified Bi 2 S 3 quantum dots with 2D MnFe 2 O 4 ultrathin nanosheets (AgQDs/BQDs-SV/MFO) is designed and constructed via photoinduced decomposition-defect engineering strategy. Theoretical calculations and experimental results demonstrate the presence of quantum dots, S vacancies, and nanosheet structure in the AgQDs/BQDs-SV/MFO heterojunction significantly improves light harvesting, charge separation, and transfer dramatically, resulting in a high-efficiency photocatalytic degradation rate (99.5%) toward Cr(VI) under visible light irradiation (λ ≥ 420 nm) at 30 min with excellent stability. This work provides new insights for constructing effective photocatalysts for purifying Cr wastewater for environmental remediation.