Pd和PdCu纳米粒子修饰ZnO光催化降解RhB性能

doi:10.12422/j.issn.1006-396X.2026.04.005

摘要/Abstract

摘要：

采用Pd和PdCu纳米粒子对棒状ZnO进行修饰，以拓宽ZnO光谱响应范围及降低光生载流子复合率，进而提高其光催化活性。通过溶剂热法合成棒状ZnO，控制金属总质量分数为3%，对比探究了Pd/ZnO和PdCu/ZnO的结构及光学特性，并关联了其催化性能。结果表明，Pd和PdCu修饰均会产生局域表面等离子体共振效应，促进光生电子与空穴的分离，提高可见光利用率；与Pd/ZnO相比，PdCu/ZnO虽具有更小的禁带宽度及更高的氧空位占比，但Pd/ZnO对光生载流子的分离能力更强，因而具有更高的降解效率；Pd/ZnO光照30 min后，RhB降解率达到99.7%，且具有优异的稳定性，经5次循环测试后降解率仍保持在96.9%。

关键词: 光催化, 氧化锌, 溶剂热法, 双金属负载, 染料降解

Abstract:

This study is dedicated to enhancing the photocatalytic performance of rod-like ZnO via surface modification with Pd and PdCu nanoparticles, with the goal of extending its spectral response and suppressing the recombination of photogenerated charge carriers. Rod-shaped ZnO was synthesized via the solvothermal method, with the total metal mass fraction controlled at 3%. The structural and optical properties of Pd/ZnO and PdCu/ZnO were comparatively investigated and correlated with their catalytic performance. Experimental results demonstrated that both Pd and PdCu modifications triggered a localized surface plasmon resonance effect, which facilitated the separation of photogenerated electron–hole pairs and enhanced visible-light harvesting efficiency. Compared with PdCu/ZnO, although Pd/ZnO exhibits a wider band gap and a lower proportion of oxygen vacancies, it demonstrates a stronger separation capability for photogenerated carriers and thus achieves higher degradation efficiency. After 30 minutes of light irradiation, the RhB degradation rate of Pd/ZnO reaches 99.7%.Moreover,Pd/ZnO possesses excellent stability, with the degradation rate remaining at 96.9% after five cycling tests.

Key words: Photocatalysis, Zinc oxide, Solvothermal method, Bimetallic loading, Dye degradation

中图分类号:

TQ426.8

贺季平, 张影. Pd和PdCu纳米粒子修饰ZnO光催化降解RhB性能[J]. 石油化工高等学校学报, 2026, 39(4): 46-53.

Jiping HE, Ying ZHANG. Enhanced Photocatalytic Degradation of Rhodamine B by Pd and PdCu Nanoparticles-Decorated ZnO[J]. Journal of Petrochemical Universities, 2026, 39(4): 46-53.

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链接本文: https://journal.lnpu.edu.cn/syhg/CN/10.12422/j.issn.1006-396X.2026.04.005

https://journal.lnpu.edu.cn/syhg/CN/Y2026/V39/I4/46

图/表 7

图1 ZnO、Pd/ZnO和PdCu/ZnO的XRD图谱

Fig.1 XRD pattern of ZnO,Pd/ZnO and PdCu/ZnO

图2 ZnO、Pd/ZnO、PdCu/ZnO的TEM及HRTEM图

Fig.2 TEM and HRTEM images of ZnO, Pd/ZnO and PdCu/ZnO

图3 光催化剂的XPS图谱及氧元素峰面积占比

Fig.3 XPS spectra and oxygen content of the photocatalysts

图4 ZnO、Pd/ZnO和PdCu/ZnO的紫外-可见漫反射光谱及Tauc-Plot图

Fig.4 UV-vis DRS spectrum and Tauc-Plot of ZnO， Pd/ZnO and PdCu/ZnO

图5 ZnO、Pd/ZnO和PdCu/ZnO的光致发光光谱

Fig.5 Photoluminescence spectra of ZnO，Pd/ZnO and PdCu/ZnO

图6 3种光催化剂的性能对比及Pd/ZnO的循环稳定性评价（a） RhB的光降解曲线（b）动力学曲线（c） Pd/ZnO循环降解测试

Fig.6 Comparative performance of three photocatalysts and cycling stability for Pd/ZnO

图7 Pd/ZnO光降解机理示意图

Fig.7 Schematic diagram of photocatalytic degradation mechanism for Pd/ZnO

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