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Indexed by:期刊论文

Date of Publication:2018-11-01

Journal:PLASMA PROCESSES AND POLYMERS

Included Journals:SCIE

Volume:15

Issue:11

ISSN No.:1612-8850

Key Words:amorphous TiO2; Au/TiO2 photocatalyst; cold plasma; plasma activation; surface plasmon resonance

Abstract:Amorphous TiO2 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 ([NH3](s)) is formed due to the hydrogen bond between surface OH groups on AmT and ammonia. The [NH3](s) suppressed the reduction of Au delta+ 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 delta+ into Au-0 but also convert [NH3](s) into poisoning species [NOy](s) during activation. H-2 plasma with a strong reducibility can simultaneously reduce Au delta+ and remove [NH3](s), thus enabling Au/AmT to achieve the highest visible-light photocatalytic activity in CO oxidation.