Photocatalytic degradation of mixed pollutants in aqueous wastewater using mesoporous 2D/2D TiO2(B)-BiOBr heterojunction

doi:10.1016/j.jmst.2020.08.036

Abstract

Abstract:

There are multiple contaminants in practical wastewater; and the photodegradation of mixed pollutants is a challenge in the field of photocatalysis. Herein, we design a mesoporous 2D/2D TiO₂(B)-BiOBr heterojunction photocatalyst for the photodegradation of mixed pollutants. Such a coupling structure results in an enhancement in the disconnection of photoexcited carriers, and the increase of absorption and reaction sites. The 2D/2D TiO₂(B)-BiOBr demonstrates outstanding photocatalytic activity for photodegrading rhodamine B (RhB), methyl orange (MO), tetracycline hydrochloride (TCH), and bisphenol A (BPA) simultaneously under visible light, which is 4.7, 1.4, 23 and 16.4 times as high as that of original BiOBr, respectively. Our work represents a possible solution to devise promising and efficient photocatalysts for the treatment of practical wastewater in the near future.

Key words: 2D/2D, TiO₂(B)-BiOBr, Heterojunction, Mixed pollutants, Photodegradation

Liping Han, Bo Li, Hao Wen, Yuxi Guo, Zhan Lin. Photocatalytic degradation of mixed pollutants in aqueous wastewater using mesoporous 2D/2D TiO₂(B)-BiOBr heterojunction[J]. J. Mater. Sci. Technol., 2021, 70: 175-184.

Figures/Tables 9

Fig. 1. (a) XRD patterns, (b) DRS and band gaps, (c) N2 desorption and adsorption, and (d) pore diameter distributions of different samples.

Fig. 2. SEM images of (a) TiO2(B), (b) BiOBr, and (c) 21TB. (d) TEM and HRTEM images of 21TB. (e) STEM images of 21TB with elemental mapping.

Fig. 3. High resolution XPS peaks of 21TB: (a) Bi 4f, (b) Br 3d, (c) O 1s, and (d) Ti 2p and Bi 4d.

Fig. 4. (a) UV-vis absorption spectral pattern of mixed pollutants on 21TB under visible light. (b) Under visible light, UV-vis absorption spectral pattern of mixed pollutants on BiOBr. (c) Photocatalytic degradation curves of mixed pollutants on BiOBr (?) and 21TB (▲), and (d) apparent photodegradation rate constants of mixed pollutants on 21TB and BiOBr.

Table 1 Comparison of single RhB, MO, TCH, and BPA degradation efficiencies by other photocatalysts and simultaneous degradation of four pollutants in this work.

Catalysts	Contaminants	Amount of catalyst	Contaminant content	Degradation efficiency	Ref.
Ag₂CO₃-g-C₃N₄	RhB	100 mg	10 mg l^-1, 100 ml	95.00 %, 54 min	[29]
ZnFe₂O₄-graphene		60 mg	15 mg l^-1, 60 ml	15.00 %, 180 min	[30]
K/Al-ZnO		150 mg	10 mg l^-1, 200 ml	54.96 %, 90 min	[31]
g-C₃N₄	MO	20 mg	10 mg l^-1, 50 ml	78.50 %, 240 min	[32]
Er³⁺-Bi₅O₇I		40 mg	10 mg l^-1, 40 ml	70.00 %, 90 min	[33]
CdIn₂S₄-TiO₂		50 mg	10 mg l^-1, 70 ml	85.90 %, 180 min	[34]
Co₃O₄-Ag-Bi₂WO₆	TCH	50 mg	10 mg l^-1, 50 ml	57.20 %, 60 min	[35]
BiOI		50 mg	30 mg l^-1, 50 ml	61.00 %, 300 min	[36]
BiOBr_0.75I_0.25-BiOIO₃		50 mg	10 mg l^-1, 50 ml	17.60 %, 120 min	[37]
ZnIn₂S₄-Fe₃O₄	BPA	10 mg	20 mg l^-1, 50 ml	34.50 %,180 min	[38]
AgI-BiOIO₃		20 mg	10 mg l^-1, 50 ml	44.60 %, 300 min	[39]
Ag-AgBr-BiOIO₃		20 mg	10 mg l^-1, 50 ml	20.00 %, 300 min	[40]
TiO₂(B)-BiOBr	RhB, MO, TCH, BPA	20 mg	40 mg l^-1, 10 mg l^-1, 10 mg l^-1, 10 mg l^-1, 100 ml	97.66 %, 85.75 %, 61.87 %, 41.83 %, 50 min	Our work

Fig. 5. (a) Loops for the photodegradation of RhB, MO, TCH, and BPA over 21TB under visible light. (b) XRD curves of 21TB before and after reaction. (c, d) SEM and (e, f) TEM patterns of 21TB before and after reaction, respectively.

Fig. 6. (a) Photocurrent generation, (b) electrochemical impedance, and (c) LSV curves for the T, B, and 21TB samples in the dark and light.

Fig. 7. UV-vis temporal absorption spectral patterns of NBT over 21TB (a) with and (b) without RhB.

Fig. 8. Proposed mechanism for photodegradation by TiO2(B)-BiOBr photocatalyst.

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Photocatalytic degradation of mixed pollutants in aqueous wastewater using mesoporous 2D/2D TiO₂(B)-BiOBr heterojunction

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