Publications (2)1.56 Total impact
-
Article: Photocatalytic degradation of azo dyes using Au:TiO2, gamma-Fe2O3:TiO2 functional nanosystems.
[show abstract] [hide abstract]
ABSTRACT: We report photocatalytic degradation studies on Navy Blue HE2R (NB) dye on significant details as a representative from the class of azo dyes using functional nanosystems specifically designed to allow a strong photocatalytic activity. A modified sol-gel route was employed to synthesize Au and gamma-Fe2O3 modified TiO2 nanoparticles (NPs) at low temperature. The attachment strategy is better because it allows clear surface of TiO2 to remain open for photo-catalysis. X-ray diffraction, Raman and UV-VIS spectroscopy studies showed the presence of gold and iron oxide phases along-with the anatase TiO2 phase. TEM studies showed TiO2 nanocomposite particles of size approximately 10-12 nm. A detailed investigation on heterogeneous photocatalytic performance for Navy Blue HE2R dye was done using the as-synthesized catalysts Au:TiO2 and gamma-Fe2O3:TiO2 in aqueous suspension under 8 W low-pressure mercury vapour lamp irradiation. Also, the photocatalytic degradation of Amranth and Orange G azo dyes were studied. The surface modified TiO2 NPs showed significantly improved photocatalytic activity as compared to pure TiO2. Exposure of the dye to the UV light in the presence of pure and gold NPs attached TiO2 catalysts caused dye degradation of about approximately 20% and approximately 80%, respectively, in the first couple of hours. In the presence of gamma-Fe2O3 NPs attached TiO2, a remarkable approximately 95% degradation of the azo dye was observed only in the first 15 min of UV exposure. The process parameters for the optimum catalytic activity are established which lead to a complete decoloration and substantial dye degradation, supported by the values of the Chemical Oxygen Demand (COD) approximately 93% and Total Organic Carbon (TOC) approximately 65% of the treated dye solution after 5 hours on the employment of the UV/Au:TiO2/H2O2 photocatalytic process.Journal of Nanoscience and Nanotechnology 02/2012; 12(2):928-36. · 1.56 Impact Factor -
Article: Journal of Nanotechnology Special issue on Functional Nanomaterials Editorial
[show abstract] [hide abstract]
ABSTRACT: The impetus of scientific community around the world of late has been on Nanoscience and technology as the researchers have envisioned great many applications for these materials earning them rightl domain of materials is special since they display extraordinary transitions in their properties in their size regime as compared to their bulk counter parts. The electrical, electronic, optical, thermal, mechanical or magnetic properties, of these classes of materials have opened great avenues for many important applications and redefined and improved the efficiencies of the devices generated out of them. The novel era of functional nanomaterials has goaded change in the face as well as phase of all the materials and facilitated design of materials customized to the needs of the mankind by manipulating matter at the nanoscopic level. The world is and will keep on witnessing the demand for new nanomaterials for multifarious high-tech and industrial applications.Journal of Nanotechnology Special issue on Functional Nanomaterials. 01/2012; Volume 2012, Article ID 732368,(doi:10.1155/2012/732368):1-2.
