Key Words:Niobium compounds;Azo dyes - Bismuth compounds - Carbon - Chlorine compounds - Efficiency - Image enhancement - Organic pollutants - Perovskite - Rhodamine B - Titanium dioxide - Water pollution

Abstract:The strategy to improve the photocatalytic removal efficiencies towards organic pollutants is still a challenge for the novel Sillen-Aurivillius perovskite type Bi<inf>4</inf>NbO<inf>8</inf>Cl. Herein, we report carbon-supported TiO<inf>2</inf>/Bi<inf>4</inf>NbO<inf>8</inf>Cl (C-TiO<inf>2</inf>/Bi<inf>4</inf>NbO<inf>8</inf>Cl) heterostructures with enhanced charge separation efficiency, which were fabricated via molten-salt flux process. The carbon-supported TiO<inf>2</inf> particles were derived from MXene Ti<inf>3</inf>C<inf>2</inf> precursors, and attached on plate-like Bi<inf>4</inf>NbO<inf>8</inf>Cl, acting as electron-traps to achieve supressed recombination of photo-induced charges. The improved charge separation confers C-TiO<inf>2</inf>/Bi<inf>4</inf>NbO<inf>8</inf>Cl heterostructures superior photocatalytic performance with 53% higher than pristine Bi<inf>4</inf>NbO<inf>8</inf>Cl, towards rhodamine B removal with the help of photo-induced holes. Moreover, the C-TiO<inf>2</inf>/Bi<inf>4</inf>NbO<inf>8</inf>Cl heterostructures can be expanded to deal with other water contaminants, such as methyl orange, ciprofloxacin and 2,4-dichlorophenol with 44, 25 and 13% promotion, respectively, and thus the study offers a series of efficient photocatalysts for water purification.<br/> © 2020 2020 Daixun Jiang et al., published by De Gruyter. 2020.

Volume:9

Issue:7

Translation or Not:no