Enhanced Photocatalytic Activity of N-doped Li2VPO6 Under Visible Light Irradiation

doi:10.1007/s40195-014-0187-3

Abstract

Abstract:

Substitutional doping of framework heteroatoms in photocatalysts is one of the approaches for harvesting visible light. The present work aims to utilize the visible light for photocatalytic degradation of organic pollutant by tailoring the bandgap energy of Li₂VPO₆ through nitrogen doping. Li₂VPO₆ and N-doped Li₂VPO₆ are prepared by solid-state method. These materials were characterized by powder X-ray diffraction, energy-dispersive spectra, Raman spectra, UV-Vis diffuse reflectance spectra (UV-Vis DRS), and ³¹P MAS NMR. The absorption edge of N-doped Li₂VPO₆ is shifted to longer wavelength region considerably. The photocatalytic activity was tested against the degradation of methylene blue. The higher visible light photocatalytic activity of N-doped Li₂VPO₆ compared to pristine Li₂VPO₆ was discussed. The catalysts are stable even after fourth cycle of photodegradation.

Key words: Photocatalysis, Characterization, Degradation

Suresh Palla, Ravinder Guje, G. Ravi, Radha Velchuri, M. Vithal. Enhanced Photocatalytic Activity of N-doped Li₂VPO₆ Under Visible Light Irradiation[J]. Acta Metallurgica Sinica (English Letters), 2015, 28(2): 216-222.

Figures/Tables 8

Fig. 1 Powder X-ray diffraction patterns of Li2VPO6 and N-doped Li2VPO6: a Patterns at 2θ range of 0°-80°; b broadened patterns at 2θ around 20°

Fig. 2 Raman spectra of Li2VPO6 and N-doped Li2VPO6

Table 1 The observed Raman band positions (cm-1) of both the samples compared with the reported Li2VPO6 FT-IR bands (cm-1)

Assignments	Li₂VPO₆ (IR cm^-1)^a	Li₂VPO₆ (Raman cm^-1)	N-Li₂VPO₆ (Raman cm^-1)^b
ν _as P-O	1,112	1,100	1,100
	1,075	1,080	1,080
	1,019	1,032	1,032
V=O stretch	1,002	-	-
V=O stretch	977	949	949
ν _s P-O stretch	967	-	-
	941	-	-
	926	927	927
	902	-	-
	882	880	880
δ _as O-P-O	623	622	622
δ _as O-P-O	616	-	-
δ _PO + δ _VO	572	575	575
δ _PO + δ _VO	507	509	509
δ _s O-P-O	470	467	467
δ _s O-P-O	427	-	-

Fig. 3 EDS spectra of Li2VPO6 (a) and N-doped Li2VPO6 (b)

Fig. 4 31P MAS NMR of Li2VPO6 (a) and N-doped Li2VPO6 (b)

Fig. 5 UV-Vis diffuse reflectance spectra (Inset shows color of the respective samples) (a) and KM plots (b) of Li2VPO6 and N-doped Li2VPO6

Fig. 6 Photocatalytic degradation of MB using Li2VPO6, N-doped Li2VPO6, and P25

Fig. 7 a Cyclic runs in the photocatalytic degradation of MB in the presence of N-doped Li2VPO6 under the visible light irradiation; b XRD patterns of N-doped Li2VPO6 before and after photocatalysts

References 44

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Enhanced Photocatalytic Activity of N-doped Li₂VPO₆ Under Visible Light Irradiation

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