Interfacial Oxygen Vacancy of Bi2O2CO3/PPy and its Visible-light Photocatalytic NO Oxidation Mechanism

doi:10.15541/jim20190281

Abstract

Abstract:

Photocatalysis technology possesses great potential in the field of oxidation of nitrogen oxides due to the low energy costs and little secondary pollution. Bismuth carbonate (Bi₂O₂CO₃, BOC)/polypyrrole (PPy) was prepared at room temperature to remove NO under visible light irradiation. After being decorated with PPy, the NO removal efficiency of BOC is enhanced from 9.4% to 20.4% while the generation of NO₂ is reduced from 2% to approximately zero, which are attributed to the oxygen vacancy formed at the interface between BOC and PPy via interfacial hydrogen bonding. Photocurrent and electrochemical impedance spectra indicate that oxygen vacancies promote the separation and migration of photo-induced electrons and holes over BOC, hence improve its photocatalytic activity. Furthermore, the presence of oxygen vacancy promotes the formation of more •O₂ ^-, and then improve the NO oxidation activity and safety of BOC together with •OH.

Key words: bismuth carbonate, polypyrrole, photocatalysis, nitric oxide, oxygen vacancies

CLC Number:

TQ174

WU Fan, ZHAO Ziyan, LI Bangxin, DONG Fan, ZHOU Ying. Interfacial Oxygen Vacancy of Bi₂O₂CO₃/PPy and its Visible-light Photocatalytic NO Oxidation Mechanism[J]. Journal of Inorganic Materials, 2020, 35(5): 541-548.

Figures/Tables 13

Fig. 1 XRD patterns of (a) BOC and BOC/PPy(0.75%), and XRD pattern of (b) PPy

Fig. 2 (a) DRIFTS spectra of PPy, BOC and BOC/PPy(0.75%); (b) UV-Vis spectra and of BOC and BOC/PPy(0.75%) with insert showing the enlarged spectra from 350 nm to 800 nm

Fig. 3 SEM images of (a) BOC and (b) BOC/PPy(0.75%); HRTEM images of (c) BOC and (d) BOC/PPy(0.75%)

Fig. 4 XPS spectra of BOC and BOC/PPy(0.75%) (a) C1s; (b) O1s; (c) Bi4f; (d) Valence band

Fig. 5 ESR spectra of BOC and BOC/PPy(0.75%) in the darkness

Fig. 6 (a) EIS measurements and (b) photocurrent of BOC and BOC/PPy(0.75%)

Fig. 7 NO oxidation of BOC and BOC/PPy(0.75%) composites under visible light irradiation (>420 nm) (a) Photocatalytic removal ratio of NO; (b) Generation of NO2

Fig. 8 Influence of influent gas relative humidity on the photocatalytic NO oxidation of BOC/PPy(0.75%)

Table 1 Assignments of adsorption peaks in IR spectra during NO adsorption and photocatalytic oxidation

Wavenumber/cm^-1	Assignment	Ref.
1262	Monodentate nitrate	[38]
1248	Bridge nitrate	[39]
1183	Nitrite	[40]
1159	NO^-	[40]
1091	Nitrite	[41]
1032, 1010	Bidentate nitrate	[38, 40]
984	Bridge nitrate	[42]

Fig. 9 In situ DRIFTS of (a) NO adsorption and (b) photocatalytic reaction during the visible light irradiation on BOC/PPy(0.75%)

Fig. 10 ESR spectra of (a) ?O2- and (b) ?OH of BOC and BOC/PPy(0.75%)

Fig. 11 Ultroviolet Photoelectron Spectrum of BOC

Fig. 12 Radical generation processes of BOC/PPy(0.75%)

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Interfacial Oxygen Vacancy of Bi₂O₂CO₃/PPy and its Visible-light Photocatalytic NO Oxidation Mechanism

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