Khodabakhsh Mohammadreza, Yilmaz Bengisu, Firoozi Sadegh, Fatmehsari Haghshenas Davoud, Unal Ugur
Chemistry Department, Koc University, Rumelifeneri yolu, Sariyer, 34450 Istanbul, Turkey.
Koc University Tupras Energy Center (KUTEM), Koc University, Rumelifeneri yolu, Sariyer, 34450 Istanbul, Turkey.
ACS Omega. 2023 Mar 9;8(11):10607-10617. doi: 10.1021/acsomega.3c00593. eCollection 2023 Mar 21.
In the present work, unilamellar [SrTaO] perovskite nanosheets with variable lateral dimensions were synthesized via a high-yield, three-step liquid exfoliation route from layered BiSrTaO. The photocatalytic activity of the parent and exfoliated layered perovskites was evaluated for the photocatalytic dye degradation of Rhodamine B under UV light (254 nm) and reduction of water to H under the full solar spectrum. A comparative study of the photocatalytic behavior of unilamellar [SrTaO] perovskite nanosheets and parent layered structure showed a significant improvement in both hydrogen evolution (98.20 vs 3 μmol g) and Rhodamine B degradation time (180 vs 30 min), with the restacked nanosheets. The exfoliation of layered perovskites not only increases their specific surface area, providing more active sites, but also reduces the recombination probability of electrons and holes due to their unilamellar structure and reduced charge transport pathways. The synthesis and preparation of strong acid solids such as [SrTaO] perovskite nanosheets can be a promising approach for effective adsorption of pollutants with cationic nature and more efficient electron transfer between the dye and catalyst. Finally, the photocatalytic characteristics of the restacked unilamellar [SrTaO] nanosheets remained unchanged after three successive cycles of recycling-reusing.
在本工作中，通过高产率的三步液相剥离法，从层状BiSrTaO合成了具有可变横向尺寸的单层[SrTaO]钙钛矿纳米片。评估了母体和剥离后的层状钙钛矿在紫外光（254 nm）下对罗丹明B的光催化染料降解以及在全太阳光谱下将水还原为氢气的光催化活性。对单层[SrTaO]钙钛矿纳米片与母体层状结构的光催化行为进行的比较研究表明，在析氢（98.20对3 μmol g）和罗丹明B降解时间（180对30分钟）方面都有显著改善，对于重新堆叠的纳米片也是如此。层状钙钛矿的剥离不仅增加了它们的比表面积，提供了更多的活性位点，而且由于其单层结构和减少的电荷传输途径，还降低了电子和空穴的复合概率。合成和制备诸如[SrTaO]钙钛矿纳米片这样的强酸固体，对于有效吸附具有阳离子性质的污染物以及在染料和催化剂之间实现更高效的电子转移而言，可能是一种有前景的方法。最后，重新堆叠的单层[SrTaO]纳米片在连续三个循环的回收再利用后，其光催化特性保持不变。
