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Title: Facile synthesis of efficient visible active C-doped TiO{sub 2} nanomaterials with high surface area for the simultaneous removal of phenol and Cr(VI)

Highlights: • Facile synthesis of C-doped TiO{sub 2} nanomaterials with high surface area. • Utilization of citric acid and ascorbic acid as fuels based on evolution of gases. • Enhanced visible activity for the oxidation of phenol and reduction of Cr(VI). • Study of simultaneous oxidation of phenol and reduction of Cr(VI) for the first time. • Proposed plausible mechanism for the simultaneous removal of phenol and Cr(VI). - Abstract: A single step synthesis of carbon doped TiO{sub 2} (anatase) nanomaterials have been reported by using combustion synthesis using ascorbic acid and citric acid fuels. X-ray diffraction studies indicated the formation of nanosized anatase titania, whereas, transmission electron microscopy confirmed the formation of nanosized TiO{sub 2} anatase. The carbon doping into TiO{sub 2} matrix was identified by X-ray photoelectron spectroscopy, whereas, thermogravimetric study quantified the carbon doping. Diffuse reflectance UV–vis spectra indicated the band gap of less than 3 eV, a prerequisite for the photocatalytic activity under visible light irradiation. The N{sub 2} adsorption studies revealed the high surface area (upto 290 m{sup 2}/g) of the synthesized photocatalysts. Typical photocatalytic activity data indicated that the simultaneous removal of Cr(VI) and phenol is advantageous than degradation of the individual pollutants.
Authors:
; ;  [1] ;  [2] ;  [3] ;  [1]
  1. Department of Chemistry, IIT Hyderabad, Yeddumailaram 502 205 (India)
  2. Defence Metallurgical Research Laboratory, Kanchanbagh, Hyderabad 500 058 (India)
  3. Ecole Polytechnique Federale de Lausanne (EPFL), Lausanne (Switzerland)
Publication Date:
OSTI Identifier:
22420776
Resource Type:
Journal Article
Resource Relation:
Journal Name: Materials Research Bulletin; Journal Volume: 61; Other Information: Copyright (c) 2014 Elsevier Science B.V., Amsterdam, The Netherlands, All rights reserved.; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; ADSORPTION; ASCORBIC ACID; CARBON; CHROMIUM COMPLEXES; CITRIC ACID; DOPED MATERIALS; IRRADIATION; NANOMATERIALS; NANOSTRUCTURES; PHENOL; PHOTOCATALYSIS; REDUCTION; SEMICONDUCTOR MATERIALS; SYNTHESIS; THERMAL GRAVIMETRIC ANALYSIS; TITANIUM OXIDES; TRANSMISSION ELECTRON MICROSCOPY; VISIBLE SPECTRA; X-RAY DIFFRACTION; X-RAY PHOTOELECTRON SPECTROSCOPY