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Remarkably fast and reusable photocatalysis by UV annealed Cu2O–SnO2 p−n heterojunction
Chemosphere ( IF 8.1 ) Pub Date : 2023-11-24 , DOI: 10.1016/j.chemosphere.2023.140787
Pheiroijam Pooja, Albert Chin

Powdered micro- or nano-particles photocatalyst has separation and recovery challenges, which may create a second pollution to environment and harmful to animals. To address those issues, SnO, CuO and CuO–SnO p-n heterojunction thin films are formed on glass substrates using efficient co-sputtering method that is commonly employed for large-area high-definition display panel. Using first-order kinetics, 100 °C ultraviolet (UV) annealed CuO–SnO p-n heterojunction shows the superb fast degradation rate constant of 0.21 and 0.16 min for methylene blue (MB) and methyl orange (MO) organic dyes, respectively, as photogenerated electron-hole pairs is increased. Record best degradation rate constants of 0.19 and 0.11 min for respective MB and MO are still achieved even after four repeated cycles. The 100 °C UV annealed CuO–SnO film catalyst displays greater degradation efficiency in both dyes, reaching 100% degradation at room temperature after 30 and 35 min of illumination for MB and MO respectively. The scavenger experiments show that hydroxyl (·OH) and superoxide radicals (·O) are the major active species in the degradation of dye. The 100 °C UV annealed CuO–SnO film catalyst showed stability as well as reusability towards the dye degradation. As a result, the present work delivers an effective way to enhance the photocatalytic performance and also an easy recovery of the catalyst, which can be explored for various emerging pollutants.

中文翻译:


紫外退火 Cu2O-SnO2 p−n 异质结实现快速且可重复使用的光催化



粉状微米或纳米颗粒光催化剂存在分离和回收挑战,这可能对环境造成二次污染并对动物有害。为了解决这些问题,采用大面积高清显示面板常用的高效共溅射方法在玻璃基板上形成 SnO、CuO 和 CuO-SnO pn 异质结薄膜。利用一级动力学,100°C 紫外 (UV) 退火的 CuO-SnO pn 异质结对亚甲基蓝 (MB) 和甲基橙 (MO) 有机染料的光生降解速率常数分别为 0.21 和 0.16 分钟电子空穴对增加。即使经过四次重复循环后,MB 和 MO 仍达到记录的最佳降解速率常数 0.19 和 0.11 分钟。 100°C UV 退火的 CuO-SnO 薄膜催化剂对两种染料都表现出更高的降解效率,在室温下分别对 MB 和 MO 照射 30 分钟和 35 分钟后达到 100% 降解。清除剂实验表明,羟基(·OH)和超氧自由基(·O)是染料降解的主要活性物质。 100 °C 紫外退火 CuO-SnO 薄膜催化剂在染料降解方面表现出稳定性和可重复使用性。因此,目前的工作提供了一种提高光催化性能的有效方法,并且催化剂易于回收,可用于各种新兴污染物的探索。
更新日期:2023-11-24
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