期刊
CARBOHYDRATE POLYMERS
卷 199, 期 -, 页码 31-40出版社
ELSEVIER SCI LTD
DOI: 10.1016/j.carbpol.2018.06.122
关键词
Chitosan; TiO2; Photocatalysis; Ag/AgCl
资金
- Science for Peace Program of North Atlantic Treaty Organization (NATO) through the Project CATALTEX [SfP 984842]
- Fundacao para a Ciencia e a Tecnologia (FCT), Portugal [SFRH/BPD/108338/2015, SFRH/BD/95358/2013, UID/NAN/50024/2013]
- Fundação para a Ciência e a Tecnologia [SFRH/BD/95358/2013] Funding Source: FCT
Aiming the degradation of harmful molecules under visible light, new photocatalytic systems were created. For this purpose, the surface of chitosan thin films was modified in heterogeneous phase via a simple and straightforward mild chemical process: chemisorption of silver ions followed by the synthesis in situ of TiO2 at low temperature (100 degrees C). A high photocatalytic activity under visible light was observed, leading to the degradation and/or mineralization of different organic products such as o-toluidine, salicylic acid and 4-amino-methyl benzoic acid. This efficiency is partly attributed to the formation of Ag NPs and also to the unexpected appearance of AgCl NPs, likely formed from the residual chlorine contained in the chitosan. The resulting TiO2/Ag/AgCl/Chitosan system is easy to prepare under mild conditions, avoiding calcination treatments and opens new perspectives for the production of visible light-driven photocatalysts. Samples were analysed by different techniques: XRD, Raman, FE-SEM, XPS, TGA, GSDR, LIF and LIP.
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