Perovskites and their derivatives are promising photocatalytic materials due to their, structural flexibility, good stability, and high catalytic efficiency [1]. Compared to binary oxides, perovskite structures offer several advantages such as a more suitable band gap for visible-light driven reactions, which can be easily modified altering the composition of the cationic sites of the perovskite. In these structures, defects like oxygen or cation vacancies play a key role in catalytic processes, promoting charge carrier separation or directly inducing reactions [2]. Among the different materials, CaCu3Ti4O12 (CCTO) double perovskite is considered a promising photoactive material due to the simultaneous presence of Ti4+ octahedra and square planar Cu2+, which gives a band gap >1.5 eV [3]. In this work, CCTO-based powders were successful synthetized through a conventional sol-gel route. The effect of high energy planetary milling on the structure, composition, and properties of the as-synthesized CCTO was accurately studied and investigated. This process induces, in fact, the formation of defects such as oxygen and cation vacancies (Cu+ and Ti3+), without affecting the medium-long range order of the structure. The photocatalytic activity of the CCTO was deeply investigated and the effect of high energy ball milling treatment (GM) of the powder on the photodegradation of Rhodamine B under sun light irradiation was studied as well. The CCTO-GM reported in this study shows promising performance for dye degradation and comparable photocatalytic kinetics of some commercial TiO2 photocatalysts, demonstrating the feasibility of this compound for photodegradation application. [1]G. Zhang et al. Chem. Soc. Rev., 2016, 45, 5951. [2]N. Zhang et al. J. Am. Chem. Soc. 2016, 138, 8928-8935. [3]J. H. Clark et al. J. Am. Chem. Soc. 2011, 133, 1016-1032.
Tailoring structural and photocatalytic properties of CaCu3Ti4O12 through high energy ball milling
A Bartoletti;A Gondolini;N Sangiorgi;E Mercadelli;A Sanson
2021
Abstract
Perovskites and their derivatives are promising photocatalytic materials due to their, structural flexibility, good stability, and high catalytic efficiency [1]. Compared to binary oxides, perovskite structures offer several advantages such as a more suitable band gap for visible-light driven reactions, which can be easily modified altering the composition of the cationic sites of the perovskite. In these structures, defects like oxygen or cation vacancies play a key role in catalytic processes, promoting charge carrier separation or directly inducing reactions [2]. Among the different materials, CaCu3Ti4O12 (CCTO) double perovskite is considered a promising photoactive material due to the simultaneous presence of Ti4+ octahedra and square planar Cu2+, which gives a band gap >1.5 eV [3]. In this work, CCTO-based powders were successful synthetized through a conventional sol-gel route. The effect of high energy planetary milling on the structure, composition, and properties of the as-synthesized CCTO was accurately studied and investigated. This process induces, in fact, the formation of defects such as oxygen and cation vacancies (Cu+ and Ti3+), without affecting the medium-long range order of the structure. The photocatalytic activity of the CCTO was deeply investigated and the effect of high energy ball milling treatment (GM) of the powder on the photodegradation of Rhodamine B under sun light irradiation was studied as well. The CCTO-GM reported in this study shows promising performance for dye degradation and comparable photocatalytic kinetics of some commercial TiO2 photocatalysts, demonstrating the feasibility of this compound for photodegradation application. [1]G. Zhang et al. Chem. Soc. Rev., 2016, 45, 5951. [2]N. Zhang et al. J. Am. Chem. Soc. 2016, 138, 8928-8935. [3]J. H. Clark et al. J. Am. Chem. Soc. 2011, 133, 1016-1032.I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.
