Fe(iii) cluster-grafted (BiO)2CO3 superstructures: in situ DRIFTS investigation on IFCT-enhanced visible light photocatalytic NO oxidation. Issue 3 (30th January 2017)

• Record Type: Journal Article
• Authors: Feng, Xin; Zhang, Wendong; Sun, Yanjuan; Huang, Hongwei; Dong, Fan
• Is Part Of: Environmental science. Volume 4:Issue 3(2017)
• Page Start: 604
• Page End: 612
• Publication Date: 2017-01-30
• Subjects: Environmental sciences -- Periodicals; Nanotechnology -- Periodicals; 620.505
• DOI: 10.1039/c6en00637j
• Languages: English
• ISSNs: 2051-8153

Abstract

Abstract : The present work revealed the photocatalysis mechanism with Fe cluster-grafted (BiO)2 CO3 under visible light for purification of NO in air. Abstract : Fe(iii ) clusters were facilely grafted on the surface of (BiO)2 CO3 (BC) hierarchical superstructures by soaking the BC in Fe(NO3 )3 aqueous solution. The presence of Fe (iii ) clusters was confirmed with HRTEM, XPS and UV-vis DRS. The ESR trapping result revealed that the ˙OH radicals are the dominant reactive species responsible for photocatalytic NO oxidation. The production of ˙OH radicals was significantly promoted by the Fe(iii ) clusters due to the enhanced charge separation. The Fe(iii ) cluster-grafted BC displayed a highly enhanced visible light photocatalytic performance due to the direct interfacial charge transfer (IFCT) from BC to the Fe clusters. The Fe(iii ) cluster-grafted BC also demonstrated high photochemical and structural stability during multiple runs. A new visible light induced photocatalysis mechanism over Fe(iii ) cluster-grafted BC involving an IFCT process was firstly proposed. The in situ DRIFTS investigation revealed that the adsorbed NO could react with the dominant ˙OH radicals and generate the final products NO2 − and NO3 − via the production of the intermediate NO2, NO2 + and NO + species. The perspective of enhancing photocatalysis via IFCT could provide a new avenue for the modification of other efficient photocatalysts for enhanced performance.