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Effect of ammonia‐derived species on visible‐light photocatalytic activity of Au supported on amorphous TiO 2 activated by plasma
Author(s) -
Sun ZhiGuang,
Li XiaoSong,
Liu JingLin,
Zhu Bin,
Li Xingguo,
Zhu AiMin
Publication year - 2018
Publication title -
plasma processes and polymers
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.644
H-Index - 74
eISSN - 1612-8869
pISSN - 1612-8850
DOI - 10.1002/ppap.201800095
Subject(s) - photocatalysis , ammonia , amorphous solid , materials science , plasma , visible spectrum , hydrogen , photochemistry , inorganic chemistry , chemical engineering , nuclear chemistry , catalysis , chemistry , organic chemistry , optoelectronics , physics , quantum mechanics , engineering
Amorphous TiO 2 supported Au photocatalyst (Au/AmT) is prepared via modified impregnation method with ammonia washing, followed by cold plasma treatment to activate the photocatalysts. Residual ammonia ([NH 3 ] s ) is formed due to the hydrogen bond between surface OH groups on AmT and ammonia. The [NH 3 ] s suppressed the reduction of Au δ+ and occupied active sites, leading to a poor activity of as‐prepared Au/AmT. The performance of cold plasmas in activation strongly depends on discharge gases. N 2 and O 2 plasmas not only cannot reduce Au δ+ into Au 0 but also convert [NH 3 ] s into poisoning species [NO y ] s during activation. H 2 plasma with a strong reducibility can simultaneously reduce Au δ+ and remove [NH 3 ] s , thus enabling Au/AmT to achieve the highest visible‐light photocatalytic activity in CO oxidation.