Utilization of Ru(II)-complex immobilized ZnO hybrid in presence of Pt(II) co-catalyst for photocatalytic reduction of 4-nitrophenol under visible light

作者：Bhar Sumana; Ananthakrishnan Rajakumar^*

来源：RSC Advances, 2015, 5(27): 20704-20711.

DOI：10.1039/c4ra13746a

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 x 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.

• 出版日期2015