Novel BP/BiOBr S-scheme nano-heterojunction for enhanced visible-light photocatalytic tetracycline removal and oxygen evolution activity

Li, Xibao; Xiong, Jie; Gao, Xiaoming; Ma, Jun; Chen, Zhi; Kang, Bangbang; Liu, Jiyou; Li, Hai; Feng, Zhijun; Huang, Juntong

doi:10.1016/j.jhazmat.2019.121690

Cited by 415 publications

(96 citation statements)

References 67 publications

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“…Beside immobilization of BiOI, coupling BiOI with a nonmetal co-catalyst to construct an S-scheme heterojunction is also an effective way to improve its performance 11, [29][30][31][32][33][34][35][36][37] . Usually, semiconductors with narrow band gap are employed as the cocatalyst in building S-scheme heterojunctions, such as CdS, MoS2, C3N4, and Bi2O3 [38][39][40][41] .…”

Section: Introductionmentioning

confidence: 99%

Fabrication of Graphene Quantum Dots Modified BiOI/PAN Flexible Fiber with Enhanced Photocatalytic Activity

He¹,

Chen²,

Luo³

et al. 2020

Acta Physico Chimica Sinica

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In environment remediation, photocatalytic oxidation is a promising technique for removing organic pollutants. Compared to adsorption, biodegradation, and chemical oxidation, photocatalytic oxidation can eliminate organic pollutants completely, conveniently, and cheaply in an environmentally friendly manner. Visible-light-driven photocatalytic oxidation is particularly advisable because of the high proportion of visible light energy in solar energy. Bismuth oxyiodide (BiOI) is a promising visible-light-driven photocatalyst for the oxidization of pollutants, not only because of its narrow band gap, but also for its relatively low valence band (VB), which is adequate for photogenerated holes to oxidize a variety of organic compounds. However, the shortcomings of BiOI powder, such the difficulty of recycling it, its low surface area, and fast carrier recombination, limit its practical applications. Meanwhile, the flexibility and hierarchical structure of photocatalysts are particularly advisable because these properties are beneficial for the convenient operation, recycling, and performance improvement of these materials. Herein, based on an electro-spun polyacrylonitrile (PAN) nanofiber substrate, a hierarchical BiOI/PAN fiber was prepared through an in situ reaction. In the as-prepared BiOI/PAN fibers, BiOI flakes were aligned vertically and uniformly around the PAN fibers. BiOI nuclei generated from preintroduced Bi(III) in the PAN fiber act as seeds for the growth of BiOI nanoplates, which is crucial for the formation of a hierarchical structure. Such a hierarchical structure can improve both the light absorption and carrier generation of the BiOI/PAN fibers, as demonstrated by UV-Vis diffuse reflectance spectra and photoluminescence emission. Therefore, the BiOI/PAN fibers exhibited higher photocatalytic activity than BiOI powder. When the BiOI/PAN fibers were decorated with pre-prepared graphene quantum dots (GQDs), a GQD-modified BiOI/PAN fibrous composite (GQD-BiOI/PAN) was fabricated. The morphology of the obtained GQD-BiOI/PAN fibers was nearly the same as that of the BiOI/PAN fibers. A step-scheme (S-scheme) heterojunction was formed between the GQDs and BiOI, which was confirmed by the fabrication method, photoluminescence emission, reactive radical tests, and XPS analysis. This kind of S-scheme heterojunction can not only effectively suppress the recombination of photogenerated holes, but can also reserve the more reductive electrons on the lowest unoccupied molecular orbital of GQDs and the more oxidative holes on the VB of BiOI, for the photocatalytic degradation of phenol. Because of the fibrous hierarchical structure and S-scheme heterojunction, GQD-BiOI/PAN outperformed BiOI nanoparticles and BiOI/PAN nanofibers in the photocatalytic oxidation of phenol under visible light. In addition, because of tight bonding, GQD-BiOI/PAN can be tailored and operated by hand, which is convenient for recycling. During recycling, no obvious loss of sample or decrease in photocatalytic activity was observed. This w...

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Section: Introductionmentioning

confidence: 99%

Fabrication of Graphene Quantum Dots Modified BiOI/PAN Flexible Fiber with Enhanced Photocatalytic Activity

He¹,

Chen²,

Luo³

et al. 2020

Acta Physico Chimica Sinica

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“…Pharmaceutical active compounds are helpful tools to eradicate human diseases but the pollution induced by the metabolized or partially metabolized pharmaceutical wastes represents an important bio-hazard [60,61]. The solvothermal technique (Figure 4) was used to develop three S-scheme heterostructures for tetracycline (TC) removal: black phosphorus (BP)/BiOBr [62], SnFe2O4/ZnFe2O4 [63], and TiO2/W18O49 [64]. The highest photocatalytic efficiency (93.2%) was recorded for SnFe2O4 nanoparticles (EG = 1.88 eV)/ZnFe2O4 nanoparticles (EG = 1.78 eV) heterostructure with a specific active surface of 68.79 m 2 /g.…”

Section: Heterostructures Obtained By Solvothermal Methodsmentioning

confidence: 99%

“…Pharmaceutical active compounds are helpful tools to eradicate human diseases but the pollution induced by the metabolized or partially metabolized pharmaceutical wastes represents an important bio-hazard [60,61]. The solvothermal technique (Figure 4) was used to develop three S-scheme heterostructures for tetracycline (TC) removal: black phosphorus (BP)/BiOBr [62] 4 shows enhanced Vis light absorbance and a direct S-scheme path of charge separation and transfer. However, the TC concentration was 5× lower (10 mg/L) compared with BP nanosheets (E G = 1.68 eV)/BiOBr nanosheets (E G = 2.73 eV) photocatalytic activity, where the efficiency was 85%.…”

Section: Heterostructures Obtained By Solvothermal Methodsmentioning

confidence: 99%

Photocatalytic Activity of S-Scheme Heterostructure for Hydrogen Production and Organic Pollutant Removal: A Mini-Review

Eneşca

Andronic

2021

Nanomaterials

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Finding new technologies and materials that provide real alternatives to the environmental and energy-related issues represents a key point on the future sustainability of the industrial activities and society development. The water contamination represents an important problem considering that the quantity and complexity of organic pollutant (such as dyes, pesticides, pharmaceutical active compounds, etc.) molecules can not be efficiently addressed by the traditional wastewater treatments. The use of fossil fuels presents two major disadvantages: (1) environmental pollution and (2) limited stock, which inevitably causes the energy shortage in various countries. A possible answer to the above issues is represented by the photocatalytic technology based on S-scheme heterostructures characterized by the use of light energy in order to degrade organic pollutants or to split the water molecule into its components. The present mini-review aims to outline the most recent achievements in the production and optimization of S-scheme heterostructures for photocatalytic applications. The paper focuses on the influence of heterostructure components and photocatalytic parameters (photocatalyst dosage, light spectra and intensity, irradiation time) on the pollutant removal efficiency and hydrogen evolution rate. Additionally, based on the systematic evaluation of the reported results, several perspectives regarding the future of S-scheme heterostructures were included.

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“…[79] Such BiOX-based catalysts exhibit apparent photocatalytic activity toward nitrogen fixation. [99][100][101][102][103][104][105][106][107][108][109][110][111][112][113][114] As depicted in Table 2, in a previous study, Li et al [46] prepared BiOBr nanosheets with abundant OVs on the exposed {001} surface and observed a photocatalytic nitrogen fixation rate of 104.2 μmol h À1 g À1 under visible light photoirradiation. In a later study, Wang et al [52] prepared Bi 5 O 7 Br nanotubes, and observed an improved photocatalytic nitrogen fixation rate of 1.38 mmol h À1 g À1 .…”

Section: Preparation Of Bismuth Oxyhalidesmentioning

confidence: 99%

“…Notably, the formation of OVs in BiOX facilitates oxygen production, [105] nitrogen fixation, [1,52,106] CO 2 reduction, [107,108] and organic pollutant degradations. [108,109] Despite the apparent advantages, limitations of the photocatalytic performance of BiOX remain, such as relatively large bandgaps that limit the solar light utilization efficiency, high recombination of photogenerated electron-hole pairs, and limited surface active centers.…”

Section: Preparation Of Bismuth Oxyhalidesmentioning

confidence: 99%

Recent Progress of the Design and Engineering of Bismuth Oxyhalides for Photocatalytic Nitrogen Fixation

Gao

Liu

et al. 2021

Adv Energy and Sustain Res

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Photocatalytic nitrogen fixation represents an effective technology for the artificial production of ammonia from atmospheric nitrogen, a critical step toward a sustainable economy. Bismuth oxyhalides (BiOX, X ¼ Cl, Br, and I) have emerged as viable catalysts for photocatalytic reduction of nitrogen into ammonia, due to their unique electronic structures and optical properties. Herein, the recent progress of BiOX-based photocatalysts for nitrogen fixation, with a focus on the reaction mechanism and pathways, materials preparation, and strategies of structural engineering for enhanced performance, is summarized. The article is concluded with a perspective where the promises and challenges of bismuthbased photocatalysts for nitrogen reduction to ammonia are highlighted, along with possible future research directions.

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Novel BP/BiOBr S-scheme nano-heterojunction for enhanced visible-light photocatalytic tetracycline removal and oxygen evolution activity

Cited by 415 publications

References 67 publications

Fabrication of Graphene Quantum Dots Modified BiOI/PAN Flexible Fiber with Enhanced Photocatalytic Activity

Fabrication of Graphene Quantum Dots Modified BiOI/PAN Flexible Fiber with Enhanced Photocatalytic Activity

Photocatalytic Activity of S-Scheme Heterostructure for Hydrogen Production and Organic Pollutant Removal: A Mini-Review

Recent Progress of the Design and Engineering of Bismuth Oxyhalides for Photocatalytic Nitrogen Fixation

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