Fabrication of a new heterostructure Au/Pt/SnO2: An excellent catalyst for fast reduction of para-nitrophenol and visible light assisted photodegradation of dyes. (September 2021)

• Record Type: Journal Article
• Authors: Jana, Sumanta; Konar, Saugata; Mitra, Bibhas Chandra; Mondal, Anup; Mukhopadhyay, Subrata
• Is Part Of: Materials research bulletin. Volume 141(2021)
• Publication Date: 2021-09
• Subjects: Heterostructure -- Environment-friendly catalyst -- Para-nitrophenol reduction -- Dye degradations -- Scavengers; Materials -- Periodicals; Crystal growth -- Periodicals; Matériaux -- Périodiques; Cristaux -- Croissance -- Périodiques; Crystal growth; Materials; Periodicals; 620.11
• DOI: 10.1016/j.materresbull.2021.111351
• Languages: English
• ISSNs: 0025-5408

Abstract

Graphical abstract: Au/Pt/SnO2 heterostructure is highly efficient to reduce toxic para-nitrophenol and can degrade 89 % RhB and 78 % CR dyes under visible radiation within 60 min. Highlights: A new route to synthesize Au/Pt/SnO2 heterostructure on TCO substrate. Au/Pt/SnO2 is effective to reduce toxic para-nitrophenol with 98 % efficiency. Acts as active photocatalyst to degrade 89 % RhB and 78 % CR dyes under visible light illumination in a reasonable time. Abstract: Described here is a typical strategy to prepare Pt/SnO2, Au/Pt/SnO2 heterostructures on transparent conducting oxide (TCO, fluorine doped tin oxide, SnO2 : F, resistivity: 10–12 Ω 2 ) substrates. Synthesized Au/Pt/SnO2 heterostructure triggers nitrophenol reduction and enhances dye degradation under visible radiation. Bi-metallic system (Au and Pt), layer of active metal oxide (SnO2 ) are introduced to speed up these applications. The reduction rate is fast and within 8 min it can reduce almost 100 % of para-nitrophenol. The decrease in band gap from 3.66 eV (for SnO2 ) to 3.28 eV (for Au/Pt/SnO2 ) ensures absorption of visible light which results enhanced photodegradation of Rhodamine B (RhB) and Congored (CR) dyes. Trapping experiments are performed by introducing scavengers to investigate the role of active species (OH, e −, h +, O2 − ) involved in dye degradation. The effects of other parameters like pH, catalyst dosage and dye concentration are precisely investigated.