WO3-x based composite material with chitosan derived nitrogen doped mesoporous carbon as matrix for oxygen vacancy induced organic pollutants catalytic reduction and IR driven H2 production

Publication date: Available online 3 April 2018 Source:Journal of Solid State Chemistry Author(s): Luyue Wang, Xinxin Xu, Zhongmin Feng, Lijun Bian, Yun Wang A nitrogen doped mesoporous carbon matrix supported tungsten oxide composite material, WO 3-x @NC, (1 > x > 0), was fabricated successfully with chitosan and polyoxometalates as precursors through calcination. In this composite material, tungsten oxide particles with the size about 5 to 8nm disperse evenly in the framework of nitrogen doped mesoporous carbon matrix. WO 3-x @NC exhibits striking catalytic activity for reductive conversion of 4-nitrophenol to 4-aminophenol with the existence of sodium borohydride (NaBH4). The conversion efficiency reaches almost 100% in 2.5min with a small amount of WO 3-x @NC as catalyst. After 5 successive cycles of reactions, this value still retains above 92%. Besides 4-nitrophenol, WO 3-x @NC also possesses excellent activity in catalytic removal of organic dyes, such as Rhodamine B (RhB) and methyl orange (MO). Oxygen vacancies from WO2 and good conductivity of nitrogen doped carbon matrix play important roles in the removal of these organic pollutants. WO 3-x @NC also possesses outstanding IR light driven photocatalytic H2 evolution activity. Furthermore, the influence of calcination temperature on catalysis is studied and an ideal condition to obtain catalyst with high activity has been obtained. We expect that WO 3-x @NC will find its way as a promising materi...

Source: Journal of Solid State Chemistry - April 4, 2018 Category: Chemistry Source Type: research