Wang Wenxin, Zhou Sijie, Zhu Yu, Li Wenhui
College of Chemistry and Materials Engineering, Anhui Science and Technology University, Bengbu, 233030, PR China; Anhui Province Quartzs and Purification and Photovoltaic Glass Engineering Research Center, Chuzhou, 233100, PR China.
Cooperative College, Jiangsu Vocational College of Business, Nantong, 226011, PR China.
J Environ Manage. 2025 Sep;391:126523. doi: 10.1016/j.jenvman.2025.126523. Epub 2025 Jul 10.
Bismuth oxyiodide (BiOI) can not only generate charge carriers (holes and electrons) under ultraviolet (UV) light irradiation but also activate potassium persulfate (PDS-K) significantly enhancing its catalytic performance. However, the narrow bandgap of single-phase BiOI leads to rapid recombination of hole/electron pairs. Considering the unique property of BiOI and the matching band structure between TiO and BiOI, a novel TiO/BiOI binary heterojunction was constructed by coupling TiO and BiOI. Microstructural characterization confirms that TiO nanoparticles are uniformly loaded on the surface of BiOI nanosheets, forming a heterojunction with an intimate interface. Response surface methodology was employed to optimize the preparation parameters of TiO/BiOI. The as-fabricated TiO/BiOI/PDS-K catalyst demonstrates high and stable photocatalytic activity for tetracycline (TC) degradation under UV irradiation. Its reaction rate constant is 2.76-fold and 8.73-fold higher than those of the TiO/BiOI/UV and PDS-K/UV systems, respectively. Additionally, HCO can react with •OH in water, reducing the concentration of •OH, which also competing with TC for h. This consequently diminishs the degradation efficiency of TC. The potential degradation pathways of TC were explored via liquid chromatography-mass spectrometry. Quenching experiment demonstrated the existence of a free radical pathway in the TiO/BiOI/PDS-K/UV system. In the free radical pathway, the primary reactive oxygen species were •SO, •OH, h and O radicals. This study provides profound insights into the construction of a reusable TiO/BiOI heterojunction integrated with PDS-K for treating industrial water environments.
碘氧化铋（BiOI）不仅能在紫外（UV）光照射下产生电荷载流子（空穴和电子），还能显著激活过硫酸钾（PDS-K），提高其催化性能。然而，单相BiOI的窄带隙导致空穴/电子对快速复合。考虑到BiOI的独特性质以及TiO和BiOI之间匹配的能带结构，通过耦合TiO和BiOI构建了一种新型的TiO/BiOI二元异质结。微观结构表征证实，TiO纳米颗粒均匀地负载在BiOI纳米片表面，形成了具有紧密界面的异质结。采用响应面法优化TiO/BiOI的制备参数。制备的TiO/BiOI/PDS-K催化剂在紫外光照射下对四环素（TC）降解表现出高且稳定的光催化活性。其反应速率常数分别比TiO/BiOI/UV和PDS-K/UV系统高2.76倍和8.73倍。此外，HCO可以与水中的•OH反应，降低•OH的浓度，这也与TC竞争h。这 consequently 降低了TC的降解效率。通过液相色谱-质谱联用探索了TC的潜在降解途径。猝灭实验证明了TiO/BiOI/PDS-K/UV系统中存在自由基途径。在自由基途径中，主要的活性氧物种是•SO、•OH、h和O自由基。本研究为构建与PDS-K集成的可重复使用的TiO/BiOI异质结处理工业水环境提供了深刻见解。
