Key Words:Boron compounds;Bismuth compounds - Chlorine compounds - Energy gap - Light absorption - Metal nanoparticles - Niobium compounds - Organic pollutants - Perovskite - Photocatalytic activity - Plasmonics - Rhodium compounds - Silver compounds - Silver nanoparticles - Transmission electron microscopy - Water treatment - X ray photoelectron spectroscopy
Abstract:Layered perovskite oxyhalide Bi<inf>4</inf>NbO<inf>8</inf>Cl has been reported as a stable photocatalyst for the organic pollutant removal. In this work, Bi<inf>4</inf>NbO<inf>8</inf>Cl was synthesized using liquid-combustion approach, and an efficient Ag/Bi<inf>4</inf>NbO<inf>8</inf>Cl photocatalyst was prepared via photo-deposition method. Transmission electron microscope (TEM) and X-ray photoelectron spectroscopy (XPS) display that metallic Ag nanoparticles (∼10 nm) are uniformly distributed on the surface of Bi<inf>4</inf>NbO<inf>8</inf>Cl. Owing to a shift of the valence and conduction band and band-gap narrowing, demonstrated by UV-vis diffuse reflection spectroscopy (UV-vis DRS) and Mott-Schottky results, the Ag/Bi<inf>4</inf>NbO<inf>8</inf>Cl show enhanced photocatalytic degradation of RhB with almost 100% within 3 h. Photogenerated holes (h<sup>+</sup>) are foremost active specie responsible for the degradation of RhB via the capture agent test. The improvement of photocatalytic performance of 3% Ag/Bi<inf>4</inf>NbO<inf>8</inf>Cl could be attributed to the synergetic effect of the surface plasmon resonance and electron sinkers by Ag nanoparticles, strengthening the visible-light absorption ability, as well as promoting the separation efficiency of charge carriers, which are beneficial for enhancing photocatalytic performance. The present work provides a promising insight into the design Bi-based photocatalysts to solve environmental pollution.<br/> © 2019 Elsevier B.V.
Volume:810
Issue:无
Translation or Not:no