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Visible-light photoactivity of plasmonic silver supported on mesoporous TiO2 nanoparticles (Ag-MTN) for enhanced degradation of 2-chlorophenol: limitation of Ag-Ti interaction

Jaafar, Nur Farhana and Abd. Jalil, Aishah and Triwahyono, Sugeng (2017) Visible-light photoactivity of plasmonic silver supported on mesoporous TiO2 nanoparticles (Ag-MTN) for enhanced degradation of 2-chlorophenol: limitation of Ag-Ti interaction. Applied Surface Science, 392 (1). pp. 1068-1077. ISSN 0169-4332

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Official URL: http://dx.doi.org/10.1016/j.apsusc.2016.09.112

Abstract

Various weight loadings of Ag (1-10 wt.%) were introduced to mesoporous titania nanoparticles (MTN) via a direct in-situ electrochemical method. The catalysts were characterized by XRD, surface area analysis, FTIR, ESR, FESEM-EDX and TEM. Characterization results indicated that the introduction of Ag onto MTN decreased the particles size and band gap of the MTN while increasing the number of oxygen vacancies (OV) and Ti3+ site defects (TSD). The activity performance of Ag-MTN on photodegradation of 2-chlorophenol (2-CP) under visible light irradiation was in the following order: 5 wt% Ag-MTN> 1 wt% Ag-MTN > MTN > 10 wt% Ag-MTN, with degradation percentages of 97, 88, 80 and 63%, respectively. The synergistic effect between Ag-0 and MTN seemed to play an important role in the system. The AgO acted as both an electron trap and a plasmonic sensitizer which suppressed the electron-hole recombination, while OV and TSD in the MTN accelerated the production of hydroxyl radicals for enhanced degradation of 2-CP. However, the formation of Ti-O-Ag in 10 wt% Ag-MTN was found to decrease the photoactivity due to the decrease in the formation of Ag-0, TSD and OV as well as the increase in band gap energy. The photodegradation of 5 wt% Ag-MTN followed a pseudo-first-order Langmuir-Hinshelwood model and the catalyst was still stable after five cycles.

Item Type:Article
Additional Information:RADIS System Ref No:PB/2017/11496
Uncontrolled Keywords:Ag-Ti interaction, visible light
Subjects:Q Science
T Technology > TP Chemical technology
Divisions:Chemical Engineering
Science
ID Code:66198
Deposited By: Widya Wahid
Deposited On:17 Jul 2017 10:08
Last Modified:17 Jul 2017 10:08

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