Achieving efficient photocatalytic activation of peroxymonosulfate (PMS) degradation of pollutants through the regulation strategy of surface microstructure in catalysts remains a challenge. Herein, CuBi2O4 nanorods (CBO NRs) and CuBi2O4 microspheres (CBO Ms) were synthesized by simply regulating the alkalinity of the reaction solvent. Under full–spectrum irradiation, CBO Ms exhibited remarkable photocatalytic performance, removing 92.48% of tetracycline (TC) within 12 min, with the reaction rate constant reaching 0.2135 min−1, which is approximately 2.7 times that of CBO NRs (0.0798 min−1). The exposure of oxygen vacancies on the surface of CBO Ms significantly promoted the generation and migration of photogenerated carriers internally, accelerated charge accumulation at the Cu active sites on the surface, and thereby enhanced the adsorption of CBO Ms on PMS. The charge density difference results confirmed the rapid transference of surface–enriched electrons to the PMS, facilitating further activation of PMS. Radical quenching experiment and EPR testing verified that both radical (SO4•−, •OH) and non–radical (1O2) pathways were involved in the reaction system. This study offers novel insights into the design of catalysts for the photocatalytic activation of PMS to efficiently degrade environmental pollutants.

中文翻译：

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揭示 CuBi2O4 微球光催化活化过一硫酸盐降解四环素的构效关系：DFT 计算和机理洞察


通过催化剂中表面微观结构的调节策略实现污染物过氧一硫酸盐 （PMS） 降解的高效光催化活化仍然是一项挑战。在此，通过简单地调节反应溶剂的碱度合成了 CuBi2O4 纳米棒 （CBO NRs） 和 CuBi2O4 微球 （CBO Ms）。在全光谱照射下，CBO Ms 表现出显著的光催化性能，在 12 分钟内去除了 92.48% 的四环素 （TC），反应速率常数达到 0.2135 min-1，约为CBO NRs的2.7倍（0.0798 min-1）。CBO Ms 表面氧空位的暴露显著促进了内部光生载流子的产生和迁移，加速了表面 Cu 活性位点的电荷积累，从而增强了 CBO Ms 对 PMS 的吸附。电荷密度差异结果证实了表面富集的电子快速转移到 PMS，促进了 PMS 的进一步激活。自由基猝灭实验和 EPR 测试证实，自由基 （SO4•−， •OH） 和非自由基 （1O2） 途径都参与反应系统。本研究为光催化活化 PMS 以有效降解环境污染物的催化剂设计提供了新的见解。