Novel fluorinated Bi2MoO6 nanocrystals for efficient photocatalytic removal of water organic pollutants under different light source illumination

摘要

Development of efficient technologies to deal with organic pollutants in wastewater is an important issue. Photocatalysis, as a "green chemistry" technology, has attracted much attention in pollutants degradation and efficient visible-light-driven photocatalysts with powerful ability to completely oxidize organic pollutants in contaminated source water are highly desirable. Here, a series of fluorinated Bi2MoO6 crystals with different atomic ratio of F to Bi ( R-F = 0.10, 0.15, 0.20, 0.25, 0.30) were prepared via a solvothermal-calcination process. The effects of F doping on the physicochemical properties of Bi2MoO6 were investigated by physicochemical techniques like XRD, N-2 adsorption, SEM, TEM, UV-Vis DRS, FT-IR, XPS, PL and photoelectrochemical measurement. The substitution of F- anions for the host O2- anions induced the lattice shrinkage, a decrease in crystal size and an increase in crystallinity. Moreover, the oxygen vacancies in F-Bi2MoO6 and F- adsorbed over the catalyst surface could withdraw the photoexcited electrons, largely boosting the separation of photoexcited electron-hole pairs. F-0.20-Bi2MoO6 displayed significant photocatalytic performance in removal of phenol, bisphenol A, 4-chlorophenol and Rhodamine B dye. ESR and radicals trapping confirmed holes are mainly responsible for the degradation of the target organic pollutants. However, center dot OH and center dot O-2(2-) could be also involve in photocatalytic reactions. Meanwhile, the more positive potential of VB in F-Bi2MoO6 could promote the oxidation power of the h(+) in organic pollutants removal. (C) 2017 Elsevier B.V. All rights reserved.