Enhancement of photoresponse to ultraviolet region by coupling perovskite LaMnO3 with TiO2 nanoparticles

International Symposium on Current Progress in Functional Materials

Afifah, N.^1,2 ; Saleh, R.^1,2

Department of Physics, Faculty of Mathematics, Natural Sciences Universitas Indonesia, Kampus UI Depok, Depok

16424, Indonesia^1

Integrated Laboratory of Energy and Environment, Faculty of Mathematics, Natural Sciences Universitas Indonesia, Kampus UI Depok, Depok

16424, Indonesia^2

关键词: 3d transition metals;    Catalytic applications;    Catalytic performance;    Effective solution;    Orthorhombic structures;    TiO2 nano-particles;    Ultrasound irradiation;    UV-visible diffuse reflectance spectroscopy;   

Others  :  https://iopscience.iop.org/article/10.1088/1757-899X/188/1/012060/pdf
DOI  :  10.1088/1757-899X/188/1/012060

来源: IOP

【 摘 要 】

Mixed oxides of rare-earth elements and 3d transition metal perovskite materials were studied for their catalytic application. We have previously reported the catalytic performance of perovskite LaMnO3nanoparticles under visible light and ultrasonic irradiation separately and simultaneously. However, LaMnO3perovskite's narrow optical gap can absorb only a small portion of the solar spectrum in the ultraviolet region, resulting in low catalytic performance. Coupling LaMnO3with other metal oxides with an optical gap in the ultraviolet light range offers an effective solution to this problem by improving catalytic performance. To this end, sol-gel was used to prepare LaMnO3/TiO2nanocomposites with varying LaMnO3to TiO2molar ratios. The LaMnO3/TiO2nanocomposites were characterized using X-ray diffraction (XRD), a vibrating samples magnetometer (VSM), and UV-visible diffuse reflectance spectroscopy (DRS). The anatase phase of TiO2and the orthorhombic structure of LaMnO3facilitate the coupling of LaMnO3with TiO2, and the incorporation of TiO2nanoparticles tends to increase the optical gap of the nanocomposite. The samples were used to remove organic dyes by means of simultaneous light and ultrasonic irradiation. The results confirm that the photosonocatalytic performance of LaMnO3/TiO2nanocomposites successfully extends to the ultraviolet light region, and the main factors influencing photosonocatalytic activity are studied and discussed.