Enhanced photocatalytic performance of SnS2/ZnO Z-scheme composite photocatalysts for efficient environmental remediation

IF 5.3 3区材料科学 Q2 MATERIALS SCIENCE, MULTIDISCIPLINARY

Materials Research Bulletin Pub Date : 2024-11-23 DOI:10.1016/j.materresbull.2024.113222

Chaoli Wang , Bin Liu , Jing Ren , Muhammad Sufyan Javed , Weihua Han

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Abstract

Photocatalysts based on zinc oxide (ZnO) are promising for environmental applications, but their weak photoresponse and low photocarrier separation efficiency limit their practical use. To tackle this issue, we constructed Z-scheme composite photocatalysts of ZnO to boost its photocatalytic performance. We achieved the Z-scheme structure by hydrothermal modification of SnS₂ nanoparticles onto ZnO microspheres. Its photocatalytic performance was evaluated through the degradation of Rhodamine B (RhB) under visible light with the assistance of magnetic stirring. The composite photocatalyst exhibited superior performance compared to individual ZnO and SnS₂, achieving an optimal degradation rate of 0.0706 min⁻¹. This rate was 15.08 times higher than that of individual ZnO and 10.51 times higher than individual SnS₂. Free radical trapping experiments showed that ·O₂⁻ and ·OH radicals played a key role in RhB degradation. The Z-scheme composite structure established novel charge transport pathways, guided the migration of photogenerated carriers, and improved spatial separation, thereby enhancing photocatalytic performance. This study provides valuable insights into the design of highly efficient photocatalysts for environmental remediation, offering a promising solution for addressing challenges in pollution control and wastewater treatment.

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增强 SnS2/ZnO Z 型复合光催化剂的光催化性能，实现高效环境修复

基于氧化锌（ZnO）的光催化剂在环境应用中大有可为，但其较弱的光响应和较低的光载体分离效率限制了其实际应用。为解决这一问题，我们构建了 Z 型结构的氧化锌复合光催化剂，以提高其光催化性能。我们通过水热法将 SnS2 纳米颗粒修饰到 ZnO 微球上，实现了 Z 型结构。在磁力搅拌的帮助下，通过在可见光下降解罗丹明 B（RhB）来评估其光催化性能。与单个 ZnO 和 SnS2 相比，复合光催化剂表现出更优越的性能，最佳降解率达到 0.0706 min-¹。这一速率是单个 ZnO 的 15.08 倍，是单个 SnS2 的 10.51 倍。自由基捕获实验表明，-O2- 和 -OH 自由基在 RhB 降解过程中发挥了关键作用。Z 型复合结构建立了新的电荷传输途径，引导了光生载流子的迁移，改善了空间分离，从而提高了光催化性能。这项研究为设计用于环境修复的高效光催化剂提供了宝贵的见解，为应对污染控制和废水处理方面的挑战提供了一种前景广阔的解决方案。

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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.