采用新型Z-scheme 0D/2D SnS2/MgO纳米异质结的可见光诱导有机污染物降解过程

IF 3.9 3区工程技术 Q2 ENGINEERING, CHEMICAL

Chemical Engineering Research & Design Pub Date : 2025-08-07 DOI:10.1016/j.cherd.2025.08.012

Marjan Tanzifi , Manouchehr Mansouri , Hadis Saraee , Nasrin Rahmatian , Anis Anvari , Mohammad Tavakkoli Yaraki

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引用次数: 0

摘要

利用水热法将SnS2量子点加载到MgO纳米片表面，成功合成了一种新型的Z-scheme SnS2/MgO纳米异质结。采用各种分析方法对光催化剂的形貌、表面特征、化学结构和光学性能进行了表征。FTIR、XRD、EDS等测试结果证实了样品的成功合成。用TEM表征了MgO纳米片的形貌，光致发光结果表明SnS2为量子点结构。DRS分析表明，与SnS2相比，合成的纳米异质结在可见光区域的吸收强度增加，吸收边缘出现红移，表明SnS2和MgO具有协同作用。PL分析表明，所有纳米异质结的光致发光都弱于SnS2，这表明其延迟了电荷-载流子的重组，增强了光催化性能。PR和EIS的结果进一步证实了这些发现。在对MB染料降解的基础上，比较了制备的光催化剂的光催化性能。结果表明，优化后的纳米异质结可以在120 min内完全去除MB。此外，考察了优化后的纳米异质结剂量和MB浓度对光降解率的影响。优化后的纳米异质结在连续5个MB降解循环中表现出良好的稳定性。活性物质的捕获实验和DRS分析揭示了两种半导体之间电荷载流子输运的z模式。

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Visible-light induced photo-degradation procedure of organic pollutants using a novel Z-scheme 0D/2D SnS2/MgO nano-heterojunction

A Novel Z-scheme SnS₂/MgO nano-heterojunction was successfully synthesized by loading SnS₂ quantum dots on the surface of MgO nanosheets using a hydrothermal procedure. The morphology, surface features, chemical structure, and optical properties of the photocatalysts were characterized using various analyses. The FTIR, XRD, and EDS results confirmed the successful synthesis of the samples. The morphology of the MgO nanosheets was characterized using TEM, while photoluminescence results suggested a quantum dot structure for the SnS₂. DRS analysis revealed that the synthesized nano-heterojunctions exhibited an increased absorption intensity and a red-shift in the absorption edge within the visible-light region compared to SnS₂, suggesting the synergistic effects of SnS₂ and MgO. PL analysis indicated that all the nano-heterojunctions exhibited weaker photoluminescence than SnS₂, which suggests a delayed charge-carrier recombination and the enhanced photocatalytic performance. These findings were further corroborated by the results of PR and EIS. The photocatalytic performance of as-prepared photocatalysts was compared based on MB dye degradation. The results demonstrated that the optimized nano-heterojunction could completely remove MB within 120 min. Moreover, the effect of optimized nano-heterojunction dose and MB concentration on the photo-degradation rate was examined. The optimized nano-heterojunction exhibited good stability in five consecutive cycles of MB degradation. The trapping experiment of active species and DRS analysis revealed a Z-scheme pattern for charge-carrier transport between the two semiconductors.

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来源期刊

Chemical Engineering Research & Design 工程技术-工程：化工

CiteScore

6.10

自引率

7.70%

发文量

623

审稿时长

42 days

期刊介绍： ChERD aims to be the principal international journal for publication of high quality, original papers in chemical engineering. Papers showing how research results can be used in chemical engineering design, and accounts of experimental or theoretical research work bringing new perspectives to established principles, highlighting unsolved problems or indicating directions for future research, are particularly welcome. Contributions that deal with new developments in plant or processes and that can be given quantitative expression are encouraged. The journal is especially interested in papers that extend the boundaries of traditional chemical engineering.