TiO 2 –NiO p–n nanocomposite with enhanced sonophotocatalytic activity under diffused sunlight
Ultrasonics Sonochemistry, ISSN: 1350-4177, Vol: 35, Issue: Pt B, Page: 655-663
2017
- 82Citations
- 58Captures
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Metrics Details
- Citations82
- Citation Indexes82
- 82
- CrossRef77
- Captures58
- Readers58
- 58
Article Description
TiO 2 –NiO composites with p–n junction were developed by assembling p-type NiO on n-type TiO 2 using ultrasound assisted wet impregnation method. The sonophotocatalytic efficiencies of pure TiO 2 and TiO 2 –NiO composites were evaluated under diffused sunlight using methyl orange (MO) as a model pollutant. The impregnation of NiO nanoparticles on TiO 2 considerably enhanced the optical absorption in visible region (500–800 nm) due to the formation of p–n junctions at the interface between TiO 2 and NiO. The internal electric field induced by the p–n junction led to effective separation of electron–hole pairs and thereby generating a large amount of reactive species for the degradation of MO. The individual effect of ultrasound and diffused sunlight for the degradation of MO was found to be 30% and 6%, respectively. A synergy of 4.8 fold was achieved when ultrasound was combined with photocatalytic degradation process in the presence of diffused sunlight. The sonophotocatalytic activity of TiO 2 –NiO photocatalysts with different NiO loading was also evaluated and 10 wt% NiO loading was found to be optimal. Moreover, 66% of Total Organic Carbon (TOC) removal was achieved with the optimized TiO 2 –NiO composite in 140 min. In addition, the TiO 2 –NiO composite exhibited an enhanced photocurrent response under visible light illumination.
Bibliographic Details
http://www.sciencedirect.com/science/article/pii/S1350417716300712; http://dx.doi.org/10.1016/j.ultsonch.2016.03.005; http://www.scopus.com/inward/record.url?partnerID=HzOxMe3b&scp=84960969404&origin=inward; http://www.ncbi.nlm.nih.gov/pubmed/26968646; https://linkinghub.elsevier.com/retrieve/pii/S1350417716300712; https://dx.doi.org/10.1016/j.ultsonch.2016.03.005
Elsevier BV
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