Preparation and Visible Light Responsive Photocatalytic Activity of Bi2MoO6/Ni-Fe LDH Composites

doi:10.15541/jim20140675

Abstract

Abstract:

Bi₂MoO₆/Ni-Fe LDH composites were prepared by hydrothermal method and co-precipitation. The morphology and structure of the sample were characterized by XRD, FT-IR, SEM, TEM, XPS and N₂-physisorption. Photocatalytic degradation activity and mechanism of the samples were investigated by the photocatalytic degradation of methyl orange (MO), methylene blue, butyl rhodamine B and phenol under visible light irradiation. The results showed that BET specific surface area of the composites increased with the LDH content increase. Photocatalytic degradation activity of MO under visible irradiation exhibited significant enhancement. After visible light irradiation for 60 min, the Bi₂MoO₆/Ni-Fe LDH composites with LDH content of 4.5wt% showed the highest degradation rate of 91%, higher than that of Bi₂MoO₆and Ni-Fe LDH by 52% and 16%, respectively. And the composites photocatalytic degradation followed first-order reaction kinetics. The composites decolorizing rate still remained 88% after 5 times recycle, showing high catalytic stability.

Key words: hydrothermal method, co-precipitation, Bi2MoO6/Ni-Fe LDH composites, photocatalyst

CLC Number:

O643

QU Ting, HUANG Qiang, ZHAO Zhen-Bo. Preparation and Visible Light Responsive Photocatalytic Activity of Bi₂MoO₆/Ni-Fe LDH Composites[J]. Journal of Inorganic Materials, 2015, 30(8): 825-832.

Figures/Tables 13

Fig. 1 XRD patterns of Bi2MoO6, Ni-Fe LDH and their composites M1, M2 and M3 at Ni-Fe LDH contents of 2%, 4.5% and 15%, respectively

Fig. 2 FT-IR spectra of Bi2MoO6 and Ni-Fe LDH and their composites M1, M2 and M3 at Ni-Fe LDH contents of 2%, 4.5% and 15%, respectively

Fig. 3 SEM images of Bi2MoO6 (a,b) and Bi2MoO6/Ni-Fe LDH(c,d)) at low (a,c) and high (b,d) magnifications

Fig. 4 TEM images of Bi2MoO6 (a,b) and Bi2MoO6/Ni-Fe LDH(c,d) at low (a,c) and high (b,d) magnifications

Fig. 5 N2 adsorption-desorption isotherms (a) and pore size distributions (b) of Bi2MoO6 and Ni-Fe LDH and their composites M1-M3 samples with different Ni-Fe LDH contents (2%; 4.5%; 15%)

Table1 BET surface area, pore volume and pore size of Bi2MoO6, Ni-Fe LDH and their composites M1-M3

Catalyst	Bi₂MoO₆	Ni-Fe LDH	M1	M2	M3
BET surface area /(m²·g^-1)	20.07	80.25	26.64	43.81	58.41
V_pore/(m²·g^-1)	0.153	0.376	0.146	0.210	0.248
d_pore/nm	30.14	16.14	20.26	17.47	15.18

Fig. 6 XPS spectra of Bi2MoO6 and Bi2MoO6/Ni-Fe LDH

Fig. 7 Photocatalytic degradation of MO (a), MB (b), Bu-RhB (c), and phenol (d) by various photocatalysts

Fig. 8 Degradation curves of M2 with Ni-Fe LDH 4.5% for reusing 1 to 5 times

Fig. 9 Kinetic curves of Bi2MoO6/Ni-Fe LDH composites for photocatalytic degradation of MO

Table 2 Kinetic parameter of Bi2MoO6/Ni-Fe LDH composites for photocatalytic degradation of MO

C₀/(mg·L^-1)	First-order reaction kinetics equation	R
10	ln(c₀/c)=0.03765t-0.0223	0.9965
12	ln(c₀/c)= 0.02122t-0.04275	0.9971
14	ln(c₀/c)= 0.0166t-0.03749	0.9958
16	ln(c₀/c)= 0.01578t-0.01939	0.9962

Fig. 10 Photocatalytic degradation efficiency for MO by the catalyst Bi2MoO6/Ni-Fe LDH composite after addition of different scavengers (20 mmol/L t-BuOH, 0.2 mmol/L sodium oxalate, 10 mmol/L K2Cr2O7 and 0.1 mmol/L BQ)

Fig. 11 Schematic illustrati on showing MO degradation over Bi2MoO6/Ni-Fe LDH composite under visible light irradiation

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Preparation and Visible Light Responsive Photocatalytic Activity of Bi₂MoO₆/Ni-Fe LDH Composites

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