Metallic silver modified SnO2–Zn2SnO4 cube nanomaterials for improved photocatalytic degradation of rhodamine B

IF 1.7 4区化学 Q4 CHEMISTRY, PHYSICAL Reaction Kinetics, Mechanisms and Catalysis Pub Date : 2024-07-30 DOI:10.1007/s11144-024-02682-2

Shuyun Huang, Huanhuan Xu, Yue Ouyang, Yun Zhou, Junwei Xu, Jianjun Liu

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Abstract

To modify the wide bandgap and intrinsic high recombination rate of photogenerated charge carriers of Zn₂SnO₄ photocatalysts, Ag/SnO₂–Zn₂SnO₄ composites were prepared by depositing Ag nanoparticles onto cube-shaped SnO₂–Zn₂SnO₄ nanomaterials via photoreduction. The composites were characterized by XRD, SEM, EDS, TEM, XPS, and UV–Vis DRS, and their photocatalytic degradation effect on rhodamine B (Rh B) for different Ag loadings was studied, with 10%Ag/SnO₂–Zn₂SnO₄ showing the greatest effect. The UV photocatalytic degradation rate of the Rh B solution reaches 100% after 12 min of visible light irradiation and 91% after five cycles. The free radical trapping agent experiment indicated that the active substances of Ag/SnO₂–Zn₂SnO₄ photocatalysis are ·O₂⁻ and h⁺. Further, photoelectrochemical tests revealed the higher electron–hole separation efficiency and faster charge transfer rate of the composites, enhancing the formation of photoproduced carriers and photocatalytic activity.

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改进罗丹明 B 光催化降解的金属银修饰 SnO2-Zn2SnO4 立方体纳米材料

为了改变 Zn2SnO4 光催化剂的宽带隙和光生电荷载流子固有的高重组率特性，研究人员通过光还原法在立方体 SnO2-Zn2SnO4 纳米材料上沉积 Ag 纳米颗粒，制备了 Ag/SnO2-Zn2SnO4 复合材料。通过 XRD、SEM、EDS、TEM、XPS 和 UV-Vis DRS 对复合材料进行了表征，并研究了不同的 Ag 负载对罗丹明 B（Rh B）的光催化降解效果，其中 10%Ag/SnO2-Zn2SnO4 的光催化降解效果最好。可见光照射 12 分钟后，Rh B 溶液的紫外光催化降解率达到 100%，循环 5 次后降解率达到 91%。自由基捕获剂实验表明，Ag/SnO2-Zn2SnO4 光催化的活性物质为 -O2- 和 h+。此外，光电化学测试表明，复合材料的电子-空穴分离效率更高，电荷转移速率更快，从而增强了光生载流子的形成和光催化活性。

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来源期刊

Reaction Kinetics, Mechanisms and Catalysis CHEMISTRY, PHYSICAL-

CiteScore

3.30

自引率

5.60%

发文量

201

审稿时长

2.8 months

期刊介绍： Reaction Kinetics, Mechanisms and Catalysis is a medium for original contributions in the following fields: -kinetics of homogeneous reactions in gas, liquid and solid phase; -Homogeneous catalysis; -Heterogeneous catalysis; -Adsorption in heterogeneous catalysis; -Transport processes related to reaction kinetics and catalysis; -Preparation and study of catalysts; -Reactors and apparatus. Reaction Kinetics, Mechanisms and Catalysis was formerly published under the title Reaction Kinetics and Catalysis Letters.