Jeyaprakash Jenson Samraj, Rajamani Manju, Bianchi Claudia L, Ashokkumar Muthupandian, Neppolian Bernaurdshaw
Department of Chemistry, Faculty of Engineering and Technology, SRM Institute of Science and Technology, Kattankulathur, Chennai 603203, India.
Department of Chemistry, University of Milan, Via Golgi 19, 20133 Milano, Italy; Consorzio Interuniversitario Nazionale per la Scienza e Tecnologia dei Materiali (INSTM), via Giusti 9, 50121 Florence, Italy.
Ultrason Sonochem. 2023 Nov;100:106624. doi: 10.1016/j.ultsonch.2023.106624. Epub 2023 Oct 9.
Metal-organic frameworks (MOFs) are a significant class of porous, crystalline materials composed of metal ions (clusters) and organic ligands. The potential use of copper MOF (Cu-BTC) for the sonophotocatalytic degradation of Tetracycline (TC) antibiotic was investigated in this study. To enhance its catalytic efficiency, S-scheme heterojunction was created by combining Cu-BTC with Zinc tungstate (ZnWO), employing an ultrasound-assisted hydrothermal method. The results demonstrated that the Cu-BTC/ZnWO heterojunction exhibited complete removal of TC within 60 min under simultaneous irradiation of visible light and ultrasound. Interestingly, the sonophotocatalytic degradation of TC using the Cu-BTC/ZnWO heterojunction showed superior efficiency (with a synergy index of ∼0.70) compared to individual sonocatalytic and photocatalytic degradation processes using the same heterojunction. This enhancement in sonophotocatalytic activity can be attributed to the formation of an S-scheme heterojunction between Cu-BTC and ZnWO. Within this heterojunction, electrons migrated from Cu-BTC to ZnWO, facilitated by the interface between the two materials. Under visible light irradiation, the built-in electric field, band edge bending, and coulomb interaction synergistically inhibited the recombination of electron-hole pairs. Consequently, the accumulated electrons in Cu-BTC and holes in ZnWO actively participated in the redox reactions, generating free radicals that effectively attacked the TC molecules. This study offers valuable perspectives on the application of a newly developed S-scheme heterojunction photocatalyst, demonstrating its effectiveness in efficiently eliminating diverse recalcitrant pollutants via sonophotocatalytic degradation.
金属有机框架材料（MOFs）是一类由金属离子（簇）和有机配体组成的重要多孔晶体材料。本研究考察了铜基金属有机框架材料（Cu-BTC）用于四环素（TC）抗生素声光催化降解的潜力。为提高其催化效率，采用超声辅助水热法将Cu-BTC与钨酸锌（ZnWO）复合构建S型异质结。结果表明，在可见光和超声同时辐照下，Cu-BTC/ZnWO异质结在60分钟内可实现TC的完全去除。有趣的是，与使用相同异质结的单独声催化和光催化降解过程相比，采用Cu-BTC/ZnWO异质结的TC声光催化降解表现出更高的效率（协同指数约为0.70）。这种声光催化活性的增强可归因于Cu-BTC与ZnWO之间形成了S型异质结。在该异质结中，电子在两种材料的界面作用下从Cu-BTC迁移至ZnWO。在可见光照射下，内建电场、能带边缘弯曲和库仑相互作用协同抑制了电子-空穴对的复合。因此，Cu-BTC中积累的电子和ZnWO中的空穴积极参与氧化还原反应，产生自由基，有效攻击TC分子。本研究为新开发的S型异质结光催化剂的应用提供了有价值的观点，证明了其通过声光催化降解有效去除各种难降解污染物的有效性。
