Preparation of SrTiO3/PPy Composites and Photocatalytic Degradation of RhB

IF 2.3 4区化学 Q3 CHEMISTRY, PHYSICAL

Catalysis Letters Pub Date : 2025-08-04 DOI:10.1007/s10562-025-05118-1

Lili Li, Jiaxin Li, Wen Xi, Jing Shu

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Abstract

Type-II SrTiO₃/PPy composites were successfully fabricated via in-situ oxidative polymerization to enhance the photocatalytic degradation efficiency of Rhodamine B (RhB). The composite design synergistically combined SrTiO₃ nanoparticles (synthesized with optimized VEG/VH₂O ratios) and polypyrrole (PPy), forming a core-shell architecture confirmed by XRD, TEM, and XPS analyses. Systematic screening of surfactants and pyrrole concentrations revealed that the composite with 5.2% pyrrole and anionic surfactant SDS exhibited optimal performance, achieving 97.60% RhB degradation under UV irradiation within 90 min. Bandgap analysis and radical trapping experiments demonstrated that the staggered Type-II heterojunction between SrTiO₃ and PPy facilitated efficient charge separation, while strong interfacial interactions promoted electron transfer from SrTiO₃ to PPy. This study elucidates the photocatalytic mechanism dominated by •O₂⁻ radicals and direct hole oxidation, providing a scalable strategy for designing high-performance photocatalysts through heterojunction engineering. The work highlights the critical role of surface chemistry and band alignment in environmental remediation applications.

Graphical Abstract

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SrTiO3/PPy复合材料的制备及其光催化降解RhB

采用原位氧化聚合法制备了ⅱ型SrTiO₃/PPy复合材料，提高了罗丹明B （Rhodamine B, RhB）的光催化降解效率。复合材料设计将SrTiO₃纳米颗粒（以优化的VEG/VH₂O比合成）和聚吡咯（PPy）协同结合，形成了核壳结构，通过XRD、TEM和XPS分析证实了这一结构。系统筛选表面活性剂和吡咯的浓度，结果表明，5.2%吡咯和阴离子表面活性剂SDS的复合材料在UV照射下，90 min内对RhB的降解率达到97.60%。带隙分析和自由基捕获实验表明，SrTiO₃和PPy之间的交错型ii异质结促进了有效的电荷分离，而强的界面相互作用促进了电子从SrTiO₃向PPy的转移。本研究阐明了•O₂⁻自由基和直接空穴氧化主导的光催化机理，为通过异质结工程设计高性能光催化剂提供了可扩展的策略。这项工作强调了表面化学和能带对准在环境修复应用中的关键作用。图形抽象

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来源期刊

Catalysis Letters 化学-物理化学

CiteScore

5.70

自引率

3.60%

发文量

327

审稿时长

1 months

期刊介绍： Catalysis Letters aim is the rapid publication of outstanding and high-impact original research articles in catalysis. The scope of the journal covers a broad range of topics in all fields of both applied and theoretical catalysis, including heterogeneous, homogeneous and biocatalysis. The high-quality original research articles published in Catalysis Letters are subject to rigorous peer review. Accepted papers are published online first and subsequently in print issues. All contributions must include a graphical abstract. Manuscripts should be written in English and the responsibility lies with the authors to ensure that they are grammatically and linguistically correct. Authors for whom English is not the working language are encouraged to consider using a professional language-editing service before submitting their manuscripts.