Sol-gel synthesis; mesoporous; titanium dioxide; optical properties; nano-photocatalysts.

New Synthetic Approach, Mesoporous properties And Photocatalytic Activity Of Titania adapted Chromium-niobate Nanocatalysts

Tanmay K. Ghorai 1,2,*, Prasanta Dhak3,4

1Department of Chemistry, West Bengal State University, Barasat, North 24 Parganas, Kolkata 700126, India 

2Department of Chemistry, University of Florida, Gainesville, FL-32611, USA

3Department of Chemistry, Nanomaterials Laboratory, Indian Institute of Technology Kharagpur, Kharagpur 721302, India

4Department of Chemistry, Jadavpur University, Kolkata 700032, India

Adv. Mater. Lett., 2013, Current Issue, 4 (2), pp 121-130

DOI: 10.5185/amlett.2012.7382

Publication Date (Web): Dec 09, 2012



Mesoporous titania adapted chromium-niobate nanocatalysts CrxNbxTi1-2xO2-x/2 (x = 0.01-0.2) were synthesized by a new synthetic approach, using N,N,N',N'-tetrakis(2-hydroxyethyl)ethylenediamine (edteH4) precursors and their photocatalytic activities were investigated. TiO2 nanomaterials have continued to be highly active in photocatalytic applications because these are useful to break down the organic molecules in water for endorsing the diffusion of reactants and products. CrxNbxTi1-2xO2-x/2 (x = 0.01)(CNT1) nanoparticles with the smaller particle sizes 12±1 nm and have mesoporous characteristics (SBET = 162 m2 g−1). The energy band gap of CNT1 was found 1.85 eV obtained from optical emission spectrum. The XRD peaks revealed a mixture of anatase and rutile phases in the synthesized powders. EPR spectroscopy showed the characteristic features of Nb5+ ions, whose existence was confirmed by XPS. The CNT1 powders display good (2.5 times greater) photocatalytic activity for degradation of Rhodamine B (RhB) as opposed to pure anatase TiO2 and other compositions of CrxNbxTi1-2xO2-x/2.


Sol-gel synthesis, mesoporous, titanium dioxide, optical properties, nano-photocatalysts.

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