One-pot preparation of Bi6O6(OH)3(NO3)3·1.5H2O (BBN)/Bi0.5O0.5ClxBr0.5-x heterostructure with improved photocatalytic activity

Qiang, Lina; Li, Guishui; Hu, Xumin; Tian, Wenxi

doi:10.1016/j.jphotochem.2018.08.043

“…Therefore, there is a need to employ a method that is effective, less costly, and environmentally friendly. Oxidative processes such as photocatalysis, the Fenton method, photolysis, sonolysis, sonocatalysis, sonoFenton, photo-Fenton, and ozonolysis 5,[9][10][11][12][13][14][15][16][17] have recently been explored. Among these, photocatalysis, which depends on in-situ photogenerated positively charged holes (h + ), hydroxyl radicals ( • OH), negatively charged electrons (e−), superoxide radicals ( • O 2 − ) has been demonstrated to be promising in terms of cost, toxicity, recyclability, mild reaction conditions, ease of operation, efficiency, and high degradation ability [18][19][20][21][22][23] .…”

Section: Introductionmentioning

confidence: 99%

Synthesis of bismuth oxyhalide (BiOBrzI(1-z)) solid solutions for photodegradation of methylene blue dye

Gembo¹,

Ochieng²,

Majoni³

et al. 2022

AAS Open Res

1

0

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Background: The removal of textile wastes is a priority due to their mutagenic and carcinogenic properties. In this study, bismuth oxyhalide was used in the removal of methylene blue (MB) which is a textile waste. The main objective of this study was to develop and investigate the applicability of a bismuth oxyhalide (BiOBrzI(1-z)) solid solutions in the photodegradation of MB under solar and ultraviolet (UV) light irradiation. Methods: Bismuth oxyhalide (BiOBrzI(1-z)) (0 ≤ z ≤ 1) materials were successfully prepared through the hydrothermal method. Brunauer-Emmett-Teller (BET), transmission electron microscope (TEM), X-ray diffractometer (XRD), and scanning electron microscope (SEM) were used to determine the surface area, microstructure, crystal structure, and morphology of the resultant products. The photocatalytic performance of BiOBrzI(1-z) materials was examined through methylene blue (MB) degradation under UV light and solar irradiation. Results: The XRD showed that BiOBrzI(1-z) materials crystallized into a tetragonal crystal structure with (102) peak slightly shifting to lower diffraction angle with an increase in the amount of iodide (I-). BiOBr0.6I0.4 materials showed a point of zero charge of 5.29 and presented the highest photocatalytic activity in the removal of MB with 99% and 88% efficiency under solar and UV irradiation, respectively. The kinetics studies of MB removal by BiOBrzI(1-z) materials showed that the degradation process followed nonlinear pseudo-first-order model indicating that the removal of MB depends on the population of the adsorption sites. Trapping experiments confirmed that photogenerated holes (h+) and superoxide radicals (•O2−) are the key species responsible for the degradation of MB. Conclusions: This study shows that bismuth oxyhalide materials are very active in the degradation of methylene blue dye using sunlight and thus they have great potential in safeguarding public health and the environment from the dye’s degradation standpoint. Moreover, the experimental results agree with nonlinear fitting.

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“…The wide band gap of ZnO causes it to be induced only under UV light, and the high recombination rate of photogenic electron-hole pair reduces their photocatalytic activity [27,28]. Similarly, as a semiconductor photocatalyst, basic bismuth nitrate (BBN) has been widely developed and studied to ascribe to its non-toxicity, corrosion resistance, suitable band gap, good photocatalytic degradation activity, and rich crystal chemical components [29][30][31]. However, the response range of basic bismuth nitrate to sunlight is mainly concentrated in the UV region, and the wide band gap greatly limits its photocatalytic activity [32][33][34].…”

Section: Introductionmentioning

confidence: 99%

“…By constructing a heterojunction of BBN and ZnO to promote photo-generated charge separation, and secondly, using the well-matched charged potential between BBN and ZnO, thereby significantly enhancing the photocatalytic efficiency of the composite material. At present, heterojunctions such as BBN/BiOCl, ZnO/CdS, ZnO/ZnS, and BiOI/ZnO were constructed to significantly enhance the photocatalytic activity [24,26,29,35].…”

Section: Introductionmentioning

confidence: 99%

Synthesis of Bi₆O₆(OH)₃(NO₃)₃·1.5H₂O/ZnO composite material with excellent photocatalytic hydrogen production performance

Wang

¹

,

Sun

²

,

Zhong

³

et al. 2021

International Journal of Smart and Nano Materials

2

0

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The heterojunction effect can effectively improve the separation efficiency of the photocatalyst's photo-generated electron and hole pairs, thereby greatly improving the photocatalytic hydrogen production performance of the photocatalyst. In this paper, Bi 6 O 6 (OH) 3 (NO 3 ) 3 • 1.5H 2 O (BBN) and ZnO are used to construct and synthesize Bi 6 O 6 (OH) 3 (NO 3 ) 3 • 1.5H 2 O/ZnO (BBN/ZnO) heterojunction photocatalyst. Under UV-vis light irradiation, the BBN/ZnO composite could generate H 2 with a rate of 28.66 μmol•g −1 •h −1 , which is higher than pure BBN (0.92 μmol•g −1 •h −1 ) and ZnO (6.54 μmol•h −1 •g −1 ) at around 31.1 and 4.4 times, respectively. Moreover, the experimental results found that the composite still exhibits excellent photocatalytic activity and maintains a high and stable activity in the 12-hour experiment with 3 cycles. The possible mechanism to enhance the photocatalytic behavior is attributed to the expanded light absorption range, reduced surface migration resistance, and inhibited recombination of photo-generated electron and hole pairs.

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“…Therefore, there is a need to employ a method that is effective, less costly, and environmentally friendly. Oxidative processes such as photocatalysis, the Fenton method, photolysis, sonolysis, sonocatalysis, sonoFenton, photo-Fenton, and ozonolysis 6,[9][10][11][12][13][14][15][16][17] have recently been explored. Among these, photocatalysis, which depends on in-situ photogenerated positively charged holes (h + ), hydroxyl radicals ( • OH), negatively charged electrons (e−), superoxide radicals ( • O 2 − ) has been demonstrated to be promising in terms of cost, toxicity, recyclability, mild reaction conditions, ease of operation, efficiency, and high degradation ability [18][19][20][21][22][23] .…”

Section: Introductionmentioning

confidence: 99%

Synthesis of bismuth oxyhalide (BiOBrzI(1-z)) solid solutions for photodegradation of methylene dye

Gembo

¹

,

Ochieng

²

,

Majoni

³

et al. 2021

AAS Open Res

1

0

View full text Add to dashboard Cite

Background: The removal of textile wastes is a priority due to their mutagenic and carcinogenic properties. In this study, bismuth oxyhalide was used in the removal of methylene blue (MB) which is a textile waste. The main objective of this study was to develop and investigate the applicability of a bismuth oxyhalide (BiOBrzI(1-z)) solid solutions in the photodegradation of MB under solar and ultraviolet (UV) light irradiation. Methods: Bismuth oxyhalide (BiOBrzI(1-z)) (0 ≤ z ≤ 1) materials were successfully prepared through the hydrothermal method. Brunauer-Emmett-Teller (BET), transmission electron microscope (TEM), X-ray diffractometer (XRD), and scanning electron microscope (SEM) were used to determine the surface area, microstructure, crystal structure, and morphology of the resultant products. The photocatalytic performance of BiOBrzI(1-z) materials was examined through methylene blue (MB) degradation under UV light and solar irradiation. Results: The XRD showed that BiOBrzI(1-z) materials crystallized into a tetragonal crystal structure with (102) peak slightly shifting to lower diffraction angle with an increase in the amount of iodide (I-). BiOBr0.6I0.4 materials showed a point of zero charge of 5.29 and presented the highest photocatalytic activity in the removal of MB with 99% and 88% efficiency under solar and UV irradiation, respectively. The kinetics studies of MB removal by BiOBrzI(1-z) materials showed that the degradation process followed nonlinear pseudo-first-order model indicating that the removal of MB depends on the population of the adsorption sites. Trapping experiments confirmed that photogenerated holes (h+) and superoxide radicals (•O2−) are the key species responsible for the degradation of MB. Conclusions: This study shows that bismuth oxyhalide materials are very active in the degradation of methylene blue dye using sunlight and thus they have great potential in safeguarding public health and the environment from the dye’s degradation standpoint. Moreover, the experimental results agree with nonlinear fitting.

show abstract

One-pot preparation of Bi6O6(OH)3(NO3)3·1.5H2O (BBN)/Bi0.5O0.5ClxBr0.5-x heterostructure with improved photocatalytic activity

Cited by 8 publications

References 40 publications

Synthesis of bismuth oxyhalide (BiOBrzI(1-z)) solid solutions for photodegradation of methylene blue dye

Synthesis of bismuth oxyhalide (BiOBrzI(1-z)) solid solutions for photodegradation of methylene blue dye

Synthesis of Bi₆O₆(OH)₃(NO₃)₃·1.5H₂O/ZnO composite material with excellent photocatalytic hydrogen production performance

Synthesis of bismuth oxyhalide (BiOBrzI(1-z)) solid solutions for photodegradation of methylene dye

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One-pot preparation of Bi6O6(OH)3(NO3)3·1.5H2O (BBN)/Bi0.5O0.5ClxBr0.5-x heterostructure with improved photocatalytic activity

Cited by 8 publications

References 40 publications

Synthesis of bismuth oxyhalide (BiOBrzI(1-z)) solid solutions for photodegradation of methylene blue dye

Synthesis of bismuth oxyhalide (BiOBrzI(1-z)) solid solutions for photodegradation of methylene blue dye

Synthesis of Bi6O6(OH)3(NO3)3·1.5H2O/ZnO composite material with excellent photocatalytic hydrogen production performance

Synthesis of bismuth oxyhalide (BiOBrzI(1-z)) solid solutions for photodegradation of methylene dye

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Product

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Synthesis of Bi₆O₆(OH)₃(NO₃)₃·1.5H₂O/ZnO composite material with excellent photocatalytic hydrogen production performance