Laboratory of Nanoparticle Science and Technology, Department of General and Inorganic Chemistry, Faculty of Chemistry and Pharmacy, University of Sofia, 1164 Sofia, Bulgaria.
Institute of Catalysis, Bulgarian Academy of Sciences, Acad. G. Bonchev St., bl. 11, 1113 Sofia, Bulgaria.
Molecules. 2024 Aug 19;29(16):3913. doi: 10.3390/molecules29163913.
Tribocatalysis is an emerging advanced oxidation process that utilizes the triboelectric effect, based on friction between dissimilar materials to produce charges that can initiate various catalytic reactions. In this study, pure and rare-earth-modified ZnO powders (LaO, EuO, 2 mol %) were demonstrated as efficient tribocatalysts for the removal of the tetracycline antibiotic doxycycline (DC). While the pure ZnO samples achieved 49% DC removal within 24 h at a stirring rate of 100 rpm, the addition of EuO increased the removal efficiency to 67%, and LaO-modified ZnO powder exhibited the highest removal efficiency, reaching 80% at the same stirring rate. Additionally, increasing the stirring rate to 300 and 500 rpm led to 100% DC removal in the ZnO/La case within 18 h, with the pronounced effect of the stirring rate confirming the tribocatalytic effect. All tribocatalysts exhibited excellent recycling properties, with less than a 3% loss of activity over three cycles. Furthermore, a scavenger assay confirmed the importance of superoxide radical generation for the overall reaction rate. The results of this investigation indicate that the rare-earth-modified ZnO tribocatalysts can effectively utilize mechanical energy to decompose pollutants in contaminated water.
摩擦电催化是一种新兴的高级氧化工艺，利用基于不同材料之间摩擦产生电荷的摩擦电效应来引发各种催化反应。在这项研究中，纯和稀土改性的 ZnO 粉末（LaO、EuO、2mol%）被证明是去除四环素抗生素强力霉素（DC）的有效摩擦催化剂。在搅拌速度为 100rpm 时，纯 ZnO 样品在 24 小时内实现了 49%的 DC 去除率，而 EuO 的添加将去除效率提高到 67%，LaO 改性的 ZnO 粉末表现出最高的去除效率，在相同的搅拌速度下达到 80%。此外，将搅拌速度提高到 300 和 500rpm 时，在 ZnO/La 情况下，在 18 小时内可实现 100%的 DC 去除，高搅拌速率证实了摩擦催化效应。所有摩擦催化剂都表现出良好的循环性能，在三个循环中活性损失小于 3%。此外，清除剂实验证实了超氧自由基生成对整个反应速率的重要性。这项研究的结果表明，稀土改性 ZnO 摩擦催化剂可以有效地利用机械能来分解受污染水中的污染物。
