am9b23351_si_001.pdf (1.43 MB)
Synthesizing BaTiO3 Nanostructures to Explore Morphological Influence, Kinetics, and Mechanism of Piezocatalytic Dye Degradation
journal contribution
posted on 2020-03-31, 21:15 authored by Daiming Liu, Chengchao Jin, Fukai Shan, Junjing He, Fei WangPiezocatalysts have attracted much attention due to their excellent
degradation ability for organics. In this work, three types of BaTiO3 (BTO) nanostructures, including hydrothermally synthesized
nanocubes (NCs), sol–gel calcined nanoparticles (NPs), and
electrospun nanofibers (NFs), are prepared for catalyzing the dye
degradation. Compared with the NCs and NPs, the NFs exhibit a higher
piezocatalytic degradation performance due to the large specific surface
area, fine crystal size, and easy deformation structure. Moreover,
the kinetic factors, including initial dye concentration, ionic strength,
ultrasonic power, and applied action, influencing the degradation
performance of the BTO NFs are analyzed deeply. A high degradation
rate constant of 0.0736 min–1 is achieved for rhodamine
B, which is superior compared with the previous reports. The excellent
stability of BTO NFs is demonstrated by the cycling tests, where a
high degradation efficiency of 97.6% within 110 min is still obtained
after the third cycle. Furthermore, the mechanism of piezocatalysis
revealed that the hydroxyl and superoxide radicals are the main reactive
species in the degradation process. This work is of importance for
the development of high-performance piezocatalysts and highlights
the potential of piezocatalysis for water remediation.