Journal
MICRO & NANO LETTERS
Volume 9, Issue 1, Pages 11-15Publisher
INST ENGINEERING TECHNOLOGY-IET
DOI: 10.1049/mnl.2013.0595
Keywords
aluminium compounds; catalysis; catalysts; chromium compounds; crystallisation; energy gap; nitrogen; photochemistry; potassium compounds; scanning electron microscopy; space groups; thermal analysis; ultraviolet spectra; visible spectra; X-ray chemical analysis; X-ray diffraction; X-ray photoelectron spectra; enhanced photoactivity; nitrogen doped KAW materials; photocatalysis; visible light active photocatalysts; science field; engineering field; solid state method; urea; nitrogen source; KCr 0; 33 1; 67 O; KAl 0; 33 1; 67 O; photocatalytic degradation; methylene blue solution; band gap energy; space group; cubic lattice; crystallization; UV-visible diffuse reflectance spectroscopy; XPS; X-ray photoelectron spectroscopy; energy dispersive spectra; scanning electron microscopy; powder X-ray diffraction; thermogravimetric analysis
Funding
- UGC (UPE)
- DST (PURSE), New Delhi
- UGC
- RFSMS (Research Fellowship in Science for Meritorious Students), New Delhi
- DST (FIST), New Delhi
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The investigation of photocatalysis by efficient visible-light-active photocatalysts has been of interest in both the science and the engineering fields. The nitrogen (N) doped KAl0.33W1.67O6 (KAW) and KCr0.33W1.67O6 (KCW) are prepared by the solid state method. Urea was used as a nitrogen source. These materials were characterised by thermo gravimetric analysis, powder X-ray diffraction, scanning electron microscopy, energy dispersive spectra, X-ray photoelectron spectroscopy (XPS) and UV-visible diffuse reflectance spectroscopy (UV-vis DRS). Both the N-doped materials crystallised in a cubic lattice with space group Fd3m. The XPS analysis of the N-doped KAW (N-doped KCW) show the characteristic peaks belonging to K 2p, Al 2p (Cr 2p), W 4f, O 1s and N 1s along with C 1s. The bandgap energy was deduced from their UV-vis DRS profiles. The photocatalytic degradation of the methylene blue solution was investigated in the presence of these oxides. Compared with their parent materials, nitrogen doped KAW and KCW samples exhibit approximate to 230 and approximate to 130% increase, respectively, in visible light-induced photodegradation of methylene blue.
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