Utilization of Ru(ii)-complex immobilized ZnO hybrid in presence of Pt(ii) co-catalyst for photocatalytic reduction of 4-nitrophenol under visible light. Issue 27 (23rd February 2015)

• Record Type: Journal Article
• Authors: Bhar, Sumana; Ananthakrishnan, Rajakumar
• Is Part Of: RSC advances. Volume 5:Issue 27(2015)
• Page Start: 20704
• Page End: 20711
• Publication Date: 2015-02-23
• Subjects: Chemistry -- Periodicals; 540.5
• DOI: 10.1039/c4ra13746a
• Languages: English
• ISSNs: 2046-2069

Abstract

Abstract : In the present study, an attempt has been made to utilize a Ru(ii )-complex-sensitized ZnO hybrid along with a Pt(ii ) salt for the visible light aided photoreduction of 4-nitrophenol. Abstract : In the present study, an attempt has been made to utilize a Ru(ii )-complex (dye)-sensitized ZnO hybrid along with a Pt(ii ) salt for the visible light aided photoreduction of 4-nitrophenol. The dye, bis(2, 2′-bipyridyl)(4, 4′-dicarboxy-2, 2′-bipyridyl)ruthenium(ii ) chloride, is used as a sensitizer for ZnO. The photocatalyst, Ru(ii ) dye–ZnO, has been characterized by XRD, FTIR, DRS, SEM, EDX and XPS. A kinetic study of the photoreduction reaction was carried out under visible light irradiation (CFL 45 W) with different concentrations of Pt(ii ) ions, without changing the 4-nitrophenol concentration. The reduced percentage reached a maximum of 55–60%, in the presence of the Pt(ii ) salt at a concentration of 2.5 × 10 −4 mol%. Control studies were done (in the presence of light and dark) to establish the photoactivity of the prepared photocatalyst. A series of experiments have been conducted to understand the mechanistic aspects of the photoreduction process, and it is identified that the photoreduction of 4-nitrophenol proceeds through an electron transfer process.