Construction of porous-hydrangea BiOBr/BiOI n-n heterojunction with enhanced photodegradation of tetracycline hydrochloride under visible light

Yang, Xiuru; Chen, Zhi; Zhao, Wan; Liu, Chunxi; Qian, Xiaoxiao; Chang, Wenya; Sun, Tao; Shen, Cai; Wei, Guoying

doi:10.1016/j.jallcom.2021.158784

Cited by 84 publications

(22 citation statements)

References 43 publications

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“…Antibiotics are one of the most emergent pollutants in natural aqueous environments worldwide due to the increased antibiotic abuse, resulting from the increased demand of the pharmaceuticals and the rapid development of the drug and medical industry (Akhil et al 2021 ; Kumar et al 2021 ; Madhura et al 2018 ; Shi et al 2019 ; Wei et al 2020 ; Yang et al 2021b ). Tetracycline, one of the highly effective broad-spectrum prescribed antibiotics, is extensively used in the therapeutic treatment, and livestock and poultry industry (Daghrir and Drogui 2013 ; Peng et al 2021 ; Zheng et al 2021 ).…”

Section: Introductionmentioning

confidence: 99%

Heterojunction photocatalysts for degradation of the tetracycline antibiotic: a review

2021

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Antibiotic pollution is a major health issue inducing antibiotic resistance and the inefficiency of actual drugs, thus calling for improved methods to clean water and wastewater. Here we review the recent development of heterojunction photocatalysis and application in degrading tetracycline. We discuss mechanisms for separating photogenerated electron–hole pairs in different heterojunction systems such as traditional, p–n, direct Z-scheme, step-scheme, Schottky, and surface heterojunction. Degradation pathways of tetracycline during photocatalysis are presented. We compare the efficiency of tetracycline removal by various heterojunctions using quantum efficiency, space time yield, and figures of merit. Implications for the treatment of antibiotic-contaminated wastewater are discussed.

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Section: Introductionmentioning

confidence: 99%

Heterojunction photocatalysts for degradation of the tetracycline antibiotic: a review

2021

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“…It is a promising photocatalyst. BiOBr has many of the same problems as most photocatalysts: 1) poor visible light response and 2) fast photoexcited electron hole recombination (Chen et al, 2019;Yang et al, 2021). In addition, BiOBr has revealed other problems as research has progressed.…”

Section: Introductionmentioning

confidence: 99%

In-situ synthesis of 3D BiOBr/UiO-66-NH2 heterojunction nanocomposite and its excellent photocatalytic degradation of rhodamine B dye

Feng

Yan²,

Ni³

et al. 2022

Front. Environ. Sci.

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As a primary goal, The fast recombination of stimulated excitons and poor visible light response are key problems in the photocatalysis field. Combining with materials with good visible light responses to form heterogeneous structures is still the most effective way. In this study, BiOBr/UiO-66-NH2 photocatalyst was synthesized by a simple method. BiOBr is a 3D spherical structure stacked by nanosheets, which enhance its adsorption capacity for pollutants and catalyze the dark reaction to reach the equilibrium point for too long. Coupling with UiO-66-NH2, its adsorption capacity was inhibited and the dark reaction time was shortened. The excellent removal rate of Rhodamine B (RhB) by BiOBr/UiO-66-NH2 reached 96.79% after 30 min of visible light irradiation and 99.37% after 90 min. With an increase in pollutant concentration, the composite still showed excellent photocatalytic performance. This study also tried to abandon the dark adsorption stage and directly degraded RhB efficiently and quickly under visible light. Finally, the photocatalytic enhancement mechanism was proposed.

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“…Evidently, these recorded UV-vis absorption spectra exhibit similar profiles with an admirable absorption edge at approximately 500 nm which arises from the O 2− /Br − → Bi 3+ charge transfer transitions. As is known, through implementing the function of αhv = A(hv − E g ) n (herein, hv denotes the energy, α refers to absorption coefficient, A is regarded as constant and n value is related to the category of semiconductor), [49,50] the E g value of semiconductor can be evaluated. Herein, the n value for BiOBr particles is 2 since it is ascribed to indirect semiconductor.…”

Section: Resultsmentioning

confidence: 99%

Tailoring of Visible Light Driven Photocatalytic Activities of Flower‐Like BiOBr Microparticles Towards Wastewater Purification Application

Wang

Duan

et al. 2021

Adv Materials Inter

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compounds based on semiconductors, such as TiO 2 , MoO 3 , ZnO, WO 3 , etc., [7][8][9][10] have been synthesized. Note that, the energy band gaps (E g ) of these aforementioned semiconductors are relatively large (i.e., E g > 3 eV) which makes them can only be excited by ultraviolet light. As is known, the ultraviolet light occupies only around 5% energy of sunlight and the residual energy is taken up by other lights, in which visible light takes up 45% and near-infrared light occupies 50%. [11,12] In view of the fact that these above photocatalytic materials are not able to efficiently harvest the sunlight, it is urgent to search for novel semiconductors that can utilize the sunlight more efficiently. To better harvest the sunlight, researchers tried to combine different semiconductors together so as to form heterojunction photocatalysts, such as ZnFe 2 O 4 /NCDs/Ag 2 CO 3 , MoO 3−x / NCNs, CdIn 2 S 4 /W 18 O 49 , MgIn 2 S 4 /CdS, etc. [13][14][15][16] resulting in admirable photocatalytic activities. However, some complex synthetic processes and special reagents are required to prepare the heterojunction compounds, leading to high cost. Thereby, extra efforts should be made to further modify the photocatalytic performances of semiconductor.Recently, bismuth-containing semiconductors, such as Bi 2 MoO 6 , BiVO 4 , BiOX (X = F, Cl, Br, I), (BiO) 2 CO 3 , etc., [17][18][19][20][21][22] have been extensively investigated as photocatalysts since they possess relatively small E g value and can harvest visible light to realize photodegradation aside from the ultraviolet light. Huang et al. revealed that the Bi 4 NbO 8 X (X = Cl, Br) nanosheets had admirable photocatalytic performance under visible light irradiation. [23] Upon solar light irradiation, Liu et al., found that the BiOI nanoplates can not only degrade tetracycline efficiently but also its photocatalytic behaviors are able to be modified via introducing vacancy. [24] Moreover, on the basis of the BiOX, Chen et al., had constructed series of heterojunction compounds and found that they can degrade pollutants easily under visible light irradiation. [25][26][27][28][29][30][31][32][33] Thus, the bismuthcontaining semiconductors are expected to be promising photocatalysts to realize wastewater purification. In comparison with other bismuth-containing semiconductors, BiOX, which pertains to the V-VI-VII ternary compounds with layered structures, has been widely researched owing to its exciting features including proper E g values, high stability, good photocatalytic Photocatalysis acts as an important role in controlling wastewater purification. However, it is still a huge challenge to obtain highly-efficient visible light driven photocatalysts. Herein, flower-like BiOBr microparticles with splendid photocatalytic activities are developed. The electronic structure of BiOBr host is explored via the first-principles density function theory. Besides, the impact of some external factors on the photocatalytic properties of BiOBr compounds is studied. In comparison, t...

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Construction of porous-hydrangea BiOBr/BiOI n-n heterojunction with enhanced photodegradation of tetracycline hydrochloride under visible light

Cited by 84 publications

References 43 publications

Heterojunction photocatalysts for degradation of the tetracycline antibiotic: a review

Heterojunction photocatalysts for degradation of the tetracycline antibiotic: a review

In-situ synthesis of 3D BiOBr/UiO-66-NH2 heterojunction nanocomposite and its excellent photocatalytic degradation of rhodamine B dye

Tailoring of Visible Light Driven Photocatalytic Activities of Flower‐Like BiOBr Microparticles Towards Wastewater Purification Application

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