Visible-light-driven photocatalytic degradation of atrazine over Ag2O-BaTiO3 S-scheme heterojunction photocatalyst

IF 5.7 3区材料科学 Q2 MATERIALS SCIENCE, MULTIDISCIPLINARY

Materials Research Bulletin Pub Date : 2025-05-20 DOI:10.1016/j.materresbull.2025.113557

Soliman I. El-Hout , Fatehy M. Abdel-Haleem , Reda M. Mohamed , Faisal K. Algethami

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Abstract

Water pollution is one of the more significant worldwide problems; notably, water pollution caused by harmful herbicides like Atrazine negatively influences the health of individuals and the ecosystem. The rendering of conventional methods is ineffective for treating antibiotic-laden wastewater. Currently, photocatalytic technology has emerged as a promising solution for degrading low-concentration, water-soluble herbicide residues through deep mineralization. Here, we showed a hydrothermally-prepared BaTiO₃ coupled with different contents of narrow-bandgap silver oxide (Ag₂O) nanocrystals. The synthesized materials underwent advanced characterization, which verified the successful formation of nanostructured Ag₂O-BaTiO₃. These heterostructures exhibited high specific surface areas (80–120 m²/g) while their fundamental structural and surface integrity remained intact. The photocatalytic performance of the prepared materials was further assessed for atrazine mineralization and degradation efficiency in aqueous solutions under visible-light irradiation. Optimal doping with trace concentrations of Ag₂O significantly improved light absorption, charge carrier mobility, and separation efficiency while reducing the material’s bandgap to 2.66 eV. The composite containing just 3wt% Ag₂O achieved complete photoelimination of atrazine under visible light within 1 hour, outperforming pure BaTiO₃ (8.0 ±0.5)%. Notably, the 3wt% Ag₂O-BaTiO₃ heterostructures exhibited a significantly enhanced kinetic rate constant of 4.28×10⁻² min⁻¹, ∼32.7-fold compared to pure BaTiO₃. Additionally, the heterostructures demonstrated exceptional recyclability in repeated atrazine photodegradation cycles, highlighting their practical applicability. A plausible mechanism for charge carrier separation within mesoporous Ag₂O-BaTiO₃ heterostructures was proposed, elucidating their enhanced photocatalytic activity. This study concludes that photocatalysts based on perovskite titanates will likely be utilized for water treatment purposes.

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ag20 - batio3 s型异质结光催化降解阿特拉津的研究

水污染是一个比较重要的世界性问题；值得注意的是，阿特拉津等有害除草剂造成的水污染对个人健康和生态系统产生了负面影响。传统的处理方法对含抗生素废水是无效的。目前，光催化技术已成为通过深部矿化降解低浓度水溶性除草剂残留物的一种很有前途的解决方案。在这里，我们展示了水热法制备的BaTiO3与不同含量的窄带隙氧化银（Ag2O）纳米晶体耦合。对合成的材料进行了高级表征，验证了纳米结构ag20 - batio3的成功形成。这些异质结构具有较高的比表面积（80-120 m²/g），而其基本结构和表面完整性保持不变。在可见光照射下，进一步评价了所制备材料的光催化性能，考察了水溶液中阿特拉津的矿化和降解效率。微量浓度Ag2O的优化掺杂显著提高了材料的光吸收、载流子迁移率和分离效率，同时将材料的带隙降低到2.66 eV。在可见光下，仅含3wt% Ag2O的复合材料在1小时内实现了阿特拉津的完全光消除，优于纯BaTiO3(8.0±0.5)%。值得注意的是，与纯BaTiO3相比，3wt% ag20 -BaTiO3异质结构表现出显著提高的动力学速率常数4.28×10−2 min−1,~ 32.7倍。此外，异质结构在重复的阿特拉津光降解循环中表现出优异的可回收性，突出了它们的实用性。提出了介孔ag20 - batio3异质结构中载流子分离的合理机制，阐明了其增强的光催化活性。本研究认为钛酸钙钛矿光催化剂有可能用于水处理。

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来源期刊

Materials Research Bulletin 工程技术-材料科学：综合

CiteScore

9.80

自引率

5.60%

发文量

372

审稿时长

42 days

期刊介绍： Materials Research Bulletin is an international journal reporting high-impact research on processing-structure-property relationships in functional materials and nanomaterials with interesting electronic, magnetic, optical, thermal, mechanical or catalytic properties. Papers purely on thermodynamics or theoretical calculations (e.g., density functional theory) do not fall within the scope of the journal unless they also demonstrate a clear link to physical properties. Topics covered include functional materials (e.g., dielectrics, pyroelectrics, piezoelectrics, ferroelectrics, relaxors, thermoelectrics, etc.); electrochemistry and solid-state ionics (e.g., photovoltaics, batteries, sensors, and fuel cells); nanomaterials, graphene, and nanocomposites; luminescence and photocatalysis; crystal-structure and defect-structure analysis; novel electronics; non-crystalline solids; flexible electronics; protein-material interactions; and polymeric ion-exchange membranes.