Flux Growth of Highly Crystalline Photocatalytic BaTiO3 Particle Layers on Porous Titanium Sponge Substrate and Insights into the Formation Mechanism

2nd International Conference on Design and Manufacturing Engineering

工业技术;机械制造

Wang, Q.^1 ; Li, B.^1

School of Mechanical and Power Engineering, East China University of Science and Technology, 130 Meilong Road, Shanghai

200237, China^1

关键词: Energy dispersive X ray spectroscopy;    Formation mechanism;    Molten salt method;    Organic pollutant degradation;    Photocatalytic activities;    Powder X ray diffraction;    Simulated sunlight;    UV-vis-diffuse reflectance;   

Others  :  https://iopscience.iop.org/article/10.1088/1757-899X/239/1/012013/pdf
DOI  :  10.1088/1757-899X/239/1/012013

学科分类：工业工程学

来源: IOP

【 摘 要 】

A unique architecture of idiomorphic and highly crystalline BaTiO3particle layers directly grown on a porous titanium sponge substrate was successfully achieved for the first time using a facile molten salt method at a relatively low temperature of 700 °C. Specifically, the low-melting KCl-NaCl eutectic salts and barium hydroxide octahydrate were employed as the reaction medium and barium source, respectively. Powder X-ray diffraction (XRD), scanning electron microscopy (SEM), Energy dispersive X-ray spectroscopy (EDS), transmission electron microscopy (TEM), high-resolution transmission electron microscopy (HRTEM) and UV-vis diffuse reflectance spectrophotometry were used to characterize the structure, morphology and optical property of the obtained samples. The results revealed that the flux-grown tetragonal BaTiO3products had well-defined and uniform morphology with an average size of 300 nm and a band gap of ∼3.16 eV. Based on XRD, EDS, SEM, and TEM, the possible formation mechanism responsible for the well-developed architecture of BaTiO3particle layers was proposed and discussed. Furthermore, the photocatalytic activity of the flux-grown BaTiO3products for organic pollutant degradation under simulated sunlight irradiation was also investigated.