Interfacial Engineering of a Z-Scheme Bi 2 O 2 S/NiTiO 3 Heterojunction Photoanode for the Degradation of Sulfamethoxazole in Water

作者：Kehinde D. Jayeola, Dimpo S. Sipuka, Tsholofelo I. Sebokolodi, Jonathan O. Babalola, Minghua Zhou, Frank Marken, Omotayo A. Arotiba · 发表于：ACS Applied Materials & Interfaces · 年份：2024 · DOI：10.1021/acsami.4c20102 · 被引用次数：19 · 研究领域：Advanced Photocatalysis Techniques、Gas Sensing Nanomaterials and Sensors、Electronic and Structural Properties of Oxides

High Resolution Image Download MS PowerPoint Slide To develop a semiconductor interface with enhanced spatial separation of carriers under visible light irradiation for the photoelectrochemical (PEC) oxidation process, we explored the fabrication of a Bi 2 O 2 S/NiTiO 3 heterojunction photoanode for the removal of sulfamethoxazole in water. The Bi 2 O 2 S/NiTiO 3 photoanode was synthesized via an in situ hydrothermal process, and it exhibited better light absorption and charge separation, as well as a reduced rate of recombination of photoexcited charge species compared to pristine Bi 2 O 2 S and NiTiO 3. The improved photoelectrocatalytic performance was attributed to the synergistic interaction between Bi 2 O 2 S and NiTiO 3 and the presence of an S–O bond at the heterojunction interface, thus resulting in Z-scheme heterojunction formation. Various characterization methods such as XPS, UV-DRS, electrochemical impedance spectroscopy, photoluminescence, FESEM, TEM, and photocurrent response measurements were explored to explain the optical and electrochemical properties of the semiconductor heterojunction. The PEC degradation process was optimized, demonstrating a degradation efficiency removal of 80% for 5 mg/L sulfamethoxazole in water, with a TOC removal of 45.5%. A Z-scheme heterojunction formation mechanism was proposed to explain the enhanced photoelectrocatalytic activity of the photoanode. This work generally contributes to the development of efficient and sustainable...