Zn doping 2D Layered δ-Bi2O3 Nanosheets for Photocatalytic Nitrogen Fixation

doi:10.15541/jim20180595

Abstract

Abstract:

Surface traps are formed by doping element into catalyst, which effectively inhibits the recombination of photogenerated carriers and achieves excellent photocatalytic nitrogen fixation performance consequently. Two-dimensional Zn-δ-Bi₂O₃nanosheets were prepared via solvothermal method using Bi(NO₃)₃·5H₂O and Zn(CH₃COO)₂as raw materials. The morphology, element composition and light-harvesting capability were characterized by XRD, SEM, EDS, XPS, TEM, and UV-Vis DRS. The results show that Zn doping attributs to interstitial deposition, and Zn-δ-Bi₂O₃ microspheres are assembled from 2D nanosheets. The ability of photocatalytic nitrogen fixation over photocatalyst was explored under room temperature and atmospheric pressure with visible light irradiation. The results show that the ammonia production over 4wt% Zn-δ-Bi₂O₃ could reach 301.6 μmol·L ^-1 after 3 h irradiation. The mechanism of photocatalytic ammonia synthesis was investigated by means of fluorescence, photocurrent and impedance spectra. Zn doping not only broadens the utilization range of visible light-harvesting, but also inhibits the recombination of photogenerated electron-hole pairs, and thus improves the performance of photocatalytic nitrogen fixation.

Key words: Zn doping, δ-Bi₂O₃, nitrogen fixation, 2D layered structure

CLC Number:

O643

GAO Xiao-Ming,SHANG Yan-Yan,LIU Li-Bo,NIE Wei. Zn doping 2D Layered δ-Bi₂O₃ Nanosheets for Photocatalytic Nitrogen Fixation[J]. Journal of Inorganic Materials, 2019, 34(9): 967-973.

Figures/Tables 8

Fig. 1 (a) XRD patterns of the as-prepared samples, (b) XPS spectra of 4wt% Zn-δ-Bi2O3, and high-resolution XPS spectra of (c) Bi4f, (d) O1s, (e) Zn2s

Fig. 2 SEM images of δ-Bi2O3 (a-c), SEM(d-f), TEM (g) and HRTEM (h) images of 4wt% Zn-δ-Bi2O3

Fig. 3 SEM image (a) and EDS mapping ((b) of total elements, (c) Bi, (d) O, (e) Zn) of 4wt% Zn-δ-Bi2O3

Fig. 4 UV-Vis-DRS spectra of the as-prepared samples

Fig. 5 (a) NH4+ concentration in water and (b) photocatalytic nitrogen fixation rate over different catalysts

Table 1 Life and relative strength of the as-prepared samples

Sample	(Decay time, τ₁/ns) /(Intensity/%)	(Decay time, τ₁/ns) /(Intensity/%)	Fitting factor, χ²	Fluorescence lifetime, τ/ns
δ-Bi₂O₃	0.1/94.93	1.92/5.07	1.194	0.192
2wt% Zn-δ-Bi₂O₃	0.18/96.53	1.23/3.47	1.192	0.216
4wt% Zn-δ-Bi₂O₃	0.18/94.75	1.89/5.25	1.282	0.300
6wt% Zn-δ-Bi₂O₃	0.18/93.85	1.87/6.15	1.135	0.284
8wt% Zn-δ-Bi₂O₃	0.19/93.08	1.28/6.92	1.230	0.267
10wt% Zn-δ-Bi₂O₃	0.19/94.37	1.36/5.63	1.124	0.256

Fig. 6 (a) Photoluminescence spectra, (b) time-resolved fluorescence decay spectra, Nyqiust flots (c) without and (d) with irradiation of 400 W xenon lamp, (e) transient photocurrent responses with on/off cycles of the irradiation of 400 W xenon lamp, and (f) Mott-Schottky plots of the as-prepared samples

Fig. 7 Schematic of photocatalytic nitrogen fixation mechanism

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Zn doping 2D Layered δ-Bi₂O₃ Nanosheets for Photocatalytic Nitrogen Fixation

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