ZnO/Zn3(PO4)2/CeO2 photocatalysts formed on zinc by plasma electrolytic oxidation

IF 3.4 3区化学 Q2 CHEMISTRY, INORGANIC & NUCLEAR Solid State Sciences Pub Date : 2024-11-05 DOI:10.1016/j.solidstatesciences.2024.107748

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Abstract

ZnO/Zn₃(PO₄)₂ coatings doped with CeO₂ particles for use in photocatalytic degradation of methyl orange (MO) were created by plasma electrolytic oxidation of zinc in a phosphate alkaline electrolyte (PAE) with CeO₂ particle concentrations of up to 1.5 g/L. The CeO₂ particle content in ZnO/Zn₃(PO₄)₂ coatings was determined by the concentration of CeO₂ particles in the PAE. Extensive research was conducted on coating morphology, chemical and phase compositions, and light-harvesting properties. The photocatalytic activity (PA) of ZnO/Zn₃(PO₄)₂/CeO₂ coatings was higher than ZnO/Zn₃(PO₄)₂. The PA of ZnO/Zn₃(PO₄)₂/CeO₂ coatings strongly depends on the amount of CeO₂ particles in PAE, and the highest PA was observed for ZnO/Zn₃(PO₄)₂/CeO₂ coating formed in PAE by adding 0.75 g/L of CeO₂ particles. The higher PA of ZnO/Zn₃(PO₄)₂/CeO₂ compared to ZnO/Zn₃(PO₄)₂ is due to a lower photogenerated electron/hole recombination. The photocatalytic degradation of MO followed a pseudo-first order kinetic model and the reaction constant of the most photoactive ZnO/Zn₃(PO₄)₂/CeO₂ coating was increased about twofold compared to the ZnO/Zn₃(PO₄)₂ coating. After 6 h of irradiation, the PA for ZnO/Zn₃(PO₄)₂ and the most photocatalytically active ZnO/Zn₃(PO₄)₂/CeO₂ was about 70 % and 98 %, respectively. A mechanism for the photodegradation of MO with the ZnO/Zn₃(PO₄)₂/CeO₂ photocatalyst was also proposed.

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等离子电解氧化法在锌上形成 ZnO/Zn3(PO4)2/CeO2 光催化剂

通过在磷酸盐碱性电解液（PAE）中对锌进行等离子电解氧化，在 CeO2 颗粒浓度高达 1.5 g/L 的情况下，制备出了掺杂有 CeO2 颗粒的 ZnO/Zn3(PO4)2 涂层，用于光催化降解甲基橙（MO）。ZnO/Zn3(PO4)2 涂层中的 CeO2 颗粒含量由 PAE 中 CeO2 颗粒的浓度决定。对涂层的形态、化学成分和相组成以及光收集特性进行了广泛的研究。ZnO/Zn3(PO4)2/CeO2 涂层的光催化活性（PA）高于 ZnO/Zn3(PO4)2。ZnO/Zn3(PO4)2/CeO2 涂层的 PA 与 PAE 中 CeO2 颗粒的含量密切相关，在 PAE 中加入 0.75 g/L 的 CeO2 颗粒形成的 ZnO/Zn3(PO4)2/CeO2 涂层的 PA 最高。与 ZnO/Zn3(PO4)2 相比，ZnO/Zn3(PO4)2/CeO2 的 PA 较高，这是因为光生电子/空穴重组较低。MO 的光催化降解遵循伪一阶动力学模型，与 ZnO/Zn3(PO4)2 涂层相比，光活性最强的 ZnO/Zn3(PO4)2/CeO2 涂层的反应常数增加了约两倍。辐照 6 小时后，ZnO/Zn3(PO4)2 和光催化活性最高的 ZnO/Zn3(PO4)2/CeO2 的 PA 分别为 70% 和 98%。此外，还提出了 ZnO/Zn3(PO4)2/CeO2 光催化剂光降解 MO 的机理。

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来源期刊

Solid State Sciences 化学-无机化学与核化学

CiteScore

6.60

自引率

2.90%

发文量

214

审稿时长

27 days

期刊介绍： Solid State Sciences is the journal for researchers from the broad solid state chemistry and physics community. It publishes key articles on all aspects of solid state synthesis, structure-property relationships, theory and functionalities, in relation with experiments. Key topics for stand-alone papers and special issues: -Novel ways of synthesis, inorganic functional materials, including porous and glassy materials, hybrid organic-inorganic compounds and nanomaterials -Physical properties, emphasizing but not limited to the electrical, magnetical and optical features -Materials related to information technology and energy and environmental sciences. The journal publishes feature articles from experts in the field upon invitation. Solid State Sciences - your gateway to energy-related materials.