Preparation of BiOClxBryIz Composite Catalysts and Its Visible Light Catalytic Degradation of Methyl Orange

Xiya Guo; Jinling Song; Baoying Wang; Xueling Zhu

doi:10.3788/AOS202141.1116003

Journals >Acta Optica Sinica >Volume 41 >Issue 11 >Page 1116003 > Article

Acta Optica Sinica
Vol. 41, Issue 11, 1116003 (2021)

Preparation of BiOCl_xBr_yI_z Composite Catalysts and Its Visible Light Catalytic Degradation of Methyl Orange

Xiya Guo, Jinling Song^*, Baoying Wang, and Xueling Zhu

Author Affiliations

School of Material and Metallurgy, Inner Mongolia University of Science and Technology, Baotou, Inner Mongolia 014010, China

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DOI: 10.3788/AOS202141.1116003 Cite this Article Set citation alerts

Xiya Guo, Jinling Song, Baoying Wang, Xueling Zhu. Preparation of BiOCl_xBr_yI_z Composite Catalysts and Its Visible Light Catalytic Degradation of Methyl Orange[J]. Acta Optica Sinica, 2021, 41(11): 1116003 Copy Citation Text

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Fig. 1. XRD patterns of pure BiOX and BiOCl_xBr_yI_z composite catalysts. (a) Pure BiOX; (b) BiOCl_xBr_yI_z composite catalysts

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Fig. 2. SEM images of BiOCl_0.33Br_0.33I_0.33 composite catalyst

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Fig. 3. EDS spectrum and mapping images of BiOCl_0.33Br_0.33I_0.33 catalyst. (a) SEM image; (b) EDS spectrum; (c)--(h) mapping images

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Fig. 4. TEM images of BiOCl_0.33Br_0.33I_0.33 catalyst

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Fig. 5. XPS spectra of BiOCl_0.33Br_0.33I_0.33 composite catalyst. (a) Survey spectrum; (b) Bi 4f; (c) O 1s; (d) Cl 2p; (e) Br 3d; (f) I 3d

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Fig. 6. UV-Vis diffuse reflectance spectra and (αhν)^1/2-hν diagrams (inside) of BiOCl_xBr_yI_z composite catalysts

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Fig. 7. PL spectra of BiOCl_xBr_yI_z composite catalysts

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Fig. 8. Efficiency graphs of BiOCl_xBr_yI_z composite catalysts and pure BiOX degrading 15 mg/L MO

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Fig. 9. Reaction kinetics diagrams of BiOCl_xBr_yI_z composite catalysts degrading 15 mg/L MO

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BiOCl_xBr_yI_z	Dosage of NaCl /g	Dosage of NaBr /g	Dosage of NaI·2H₂O /g
BiOCl_0.1Br_0.1I_0.8	0.0351	0.0617	0.8924
BiOCl_0.1Br_0.8I_0.1	0.0351	0.4939	0.1116
BiOCl_0.2Br_0.2I_0.6	0.0702	0.1235	0.6693
BiOCl_0.2Br_0.6I_0.2	0.0702	0.3704	0.2231
BiOCl_0.33Br_0.33I_0.33	0.1157	0.2037	0.3681
BiOCl_0.6Br_0.2I_0.2	0.2104	0.1235	0.2231
BiOCl_0.8Br_0.1I_0.1	0.2805	0.0617	0.1116

Table 1. Dosage table of NaX in the preparation of BiOCl_xBr_yI_z catalysts

Element	Bi	C	Br	I	O	Cl
Mass fraction /%	61.57	10.07	9.71	9.13	4.83	4.68
Atomic fraction /%	16.73	47.62	6.90	4.09	17.15	7.50

Table 2. EDS analysis of each element in BiOCl_0.33Br_0.33I_0.33 composite catalyst

BiOCl_xBr_yI_z	Band gapE_g /eV	Degradationefficiencyη /%	Kineticconstant k /(10^-2 min^-1)
BiOCl_0.33Br_0.33I_0.33	1.83	98.4	2.160
BiOCl_0.2Br_0.6I_0.2	2.06	96.2	1.820
BiOCl_0.2Br_0.2I_0.6	1.70	90.5	1.310
BiOCl_0.1Br_0.1I_0.8	1.65	82.0	0.931
BiOCl_0.6Br_0.2I_0.2	2.13	70.1	0.654
BiOCl_0.8Br_0.1I_0.1	2.36	43.0	0.318

Table 3. Band gaps, degradation efficiencies and kinetic constants of BiOCl_xBr_yI_z composite catalysts

Catalyst and its mass	Contaminant and itsmass concentration	Light source	Degradationefficiency	α_TOF /(g·g^-1·min^-1)	Ref.
BiOI (0.100 g)	MO (10 mg·L^-1)	500 W Xe lamp(λ>420 nm)	360(95)	0.006	[11]
BiOCl_0.5Br_0.5(0.050 g)	MO (20 mg·L^-1)	300 W Xe lamp (λ>400 nm)	70(100)	0.022	[12]
BiOBr_0.4I_0.6 (1.000 g)	MO (20 mg·L^-1)	500 W Xe lamp (λ>400 nm)	90(92.6)	0.021	[13]
BiOCl_0.75I_0.25 (0.200 g)	MO (20 mg·L^-1)	500 W Xe lamp (λ>420 nm)	50(100)	0.020	[15]
BiOCl_0.5I_0.5 (0.020 g)	MO (15 mg·L^-1)	300 W Xe lamp (λ>400 nm)	180(83.0)	0.035	[21]
Er³⁺-Bi₅O₇I (0.04 g)	MO (10 mg·L^-1)	5 W LED lamp	90(70)	0.0077	[22]
BiOCl_0.33Br_0.33I_0.33 (0.020 g)	MO (15 mg·L^-1)	300 W Xe lamp (λ>400 nm)	180(98.4)	0.041	This work
Note:α_TOF= $\frac{CVη}{mt}$ ×100%, where C represents the original concentration of the simulated pollutant methyl orange, V represents the volume of the methyl orange solution, η represents the degradation efficiency of the methyl orange by the catalyst, m represents the quality of the catalyst, and t represents the duration of light.

Table 4. Photocatalytic activity of different BiOX_s catalysts

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