Fabrication of the AgI/BiOI/BiPO4 multi-heterojunction with high photocatalytic activity

“…As an example of a heterogeneous photocatalytic reaction with efficient carrier separation and well-matched energy band structure, can refer to the organic/inorganic PDI-Urea/BiOBr S-scheme heterojunction with photocatalytic performance for the degradation of antibiotics such as ofloxacin, tetracycline as well as high–low junction OV-BiOBr/Cu 2− x S with double defects namely, oxygen and copper vacancy for hydrogen evolution [ 34 , 35 ]. In addition to these, we can refer to visible light photo-response AgI-loaded BiOI, Bi 2 S 3 /Bi 2 O 3 /Bi 2 O 2 CO 3 ternary nanocomposites, Z-scheme Ag–AgI/BiOI–Bi 2 O 3 photocatalysts and SnO 2 /Bi 2 O 3 /BiOI nanofibers with enhanced photocatalytic performance [ 36 –, 37 , 38 , 39 ]. IEF is a factor in improving photocatalytic activity by means of simplifying transformation and separation of the photogenerated carriers.…”

Section: Introductionmentioning

confidence: 99%

Structural, Optical and Photocatalytic Activity of Multi-heterojunction Bi2O3/Bi2O2CO3/(BiO)4CO3(OH)2 Nanoflakes Synthesized via Submerged DC Electrical Discharge in Urea Solution

Hashemi

Poursalehi²,

Delavari³

2022

Nanoscale Res Lett

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In this research, a novel ternary multi-heterojunction Bi2O3/Bi2O2CO3/(BiO)4CO3(OH)2 photocatalyst is fabricated via submerged DC electrical arc discharge in urea solution. FT-IR, XRD, EDS and PL results confirm the formation of Bi2O3/Bi2O2CO3/(BiO)4CO3(OH)2 multi-heterojunction. Formation of nanoflake morphology is revealed by FE-SEM and TEM images. The optical properties and intense absorption edge of Bi2O3/Bi2O2CO3/(BiO)4CO3(OH)2 reveal the proper visible light absorbing ability. The photocatalytic performance of the sample is investigated via the degradation of methylene orange (MeO) and rhodamine B (RB) under visible light irradiation. The photocatalytic activity of Bi2O3/Bi2O2CO3/(BiO)4CO3(OH)2 is compared with the synthesized sample in water, Bi2O3/Bi/Bi(OH)3, which exhibits much higher photocatalytic activity. Also, the stable photodegradation efficiency of Bi2O3/Bi2O2CO3/(BiO)4CO3(OH)2 after four cycles reveals the long-term stability and reusability of the synthesized photocatalyst. The PL intensity of Bi2O3/Bi2O2CO3/(BiO)4CO3(OH)2 shows an improved separation rate of electron–hole pairs and so enhanced photocatalytic performance. The improved photocatalytic activity can be ascribed to the formation of multi-heterojunctions, flake morphology and intrinsic internal electric field (IEF). Multi-heterojunction nanoflakes enhance the absorbance of visible light and facilitate the separation and transport of photogenerated electron holes through large IEF. Our work offers an effective method for the production of innovative bismuth-based photocatalyst with excellent prospects for the degradation of environmental pollutants and light harvesting for renewable energy generation under visible light.

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“…The construction of a heterojunction can e ciently improve the photocatalytic activity by increasing the separation of photo-generated electrons and holes effectively. In addition, multi heterojunctions can show better charge transport mechanism and thus higher photocatalytic activity, for instance, visible light photo-response AgI loaded BiOI, Bi 2 S 3 /Bi 2 O 3 /Bi 2 O 2 CO 3 ternary nanocomposites, Zscheme Ag-AgI/BiOI-Bi 2 O 3 photocatalysts and SnO 2 /Bi 2 O 3 /BiOI nano bers with enhanced photocatalytic performance [32][33][34][35] . IEF is a factor in improving photocatalytic activity by means of simplifying transformation and separation of the photo generated carriers.…”

Section: Introductionmentioning

confidence: 99%

Structural, Optical and Photocatalytic Activity of α-Bi2O3/Bi2O2CO3/(BiO)4CO3(OH)2 Ternary Multi-heterojunction Nanoflakes Synthesized via Submerged DC Electrical Discharge in Urea Solution

Hashemi

Poursalehi

Delavari

2022

Preprint

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In this research, novel α-Bi2O3/Bi2O2CO3/(BiO)4CO3(OH)2 multi-heterojunction photocatalytic nanoflakes are fabricated via submerged DC electrical arc discharge in urea in water solution. FT-IR, XRD, EDS and PL results conform the formation of α-Bi2O3/Bi2O2CO3/(BiO)4CO3(OH)2 multi-heterojunction. Formation of nanoflake morphology are revealed by FE-SEM, TEM images. Based on UV-visible results the calculated band gap energies are in the range between 2.7 and 3.0 eV for fresh sample and after one month. The photocatalytic performance of sample is investigated via degradation of methylene orange (MeO) under visible light irradiation. α-Bi2O3/Bi2O2CO3/ (BiO)4CO3(OH)2 exhibited much higher photocatalytic activity than Bi2O2CO3, Bi2O3 and Bi2O3/Bi2O2CO3. Also, stable photodegradation efficiency of sample after four cycles reveal the long term stability and reusability of synthesized photocatalyst. PL intensity show improved separation rate of electrons and holes and so better photocatalytic performance of multi-heterojunction in compared to single phase photocatalyst. The enhanced photocatalytic activity can be ascribed to the formation of multi-heterojunctions, flake morphology and intrinsic internal electric field (IEF). Multi-heterojunction nanoflakes enhance the absorbance of visible light and facilitate the separation and transport of photogenerated electron-holes through large IEF which enhance the photocatalytic activity. Our work offers an effective method for production of innovative bismuth based photocatalyst with excellent prospective for degradation of environmental pollutions and light harvesting for renewable energy generation under visible-light.

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Fabrication of the AgI/BiOI/BiPO4 multi-heterojunction with high photocatalytic activity

Cited by 30 publications

References 45 publications

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17α-Ethinylestradiol (EE2): concentrations in the environment and methods for wastewater treatment – an update

Structural, Optical and Photocatalytic Activity of Multi-heterojunction Bi2O3/Bi2O2CO3/(BiO)4CO3(OH)2 Nanoflakes Synthesized via Submerged DC Electrical Discharge in Urea Solution

Structural, Optical and Photocatalytic Activity of α-Bi2O3/Bi2O2CO3/(BiO)4CO3(OH)2 Ternary Multi-heterojunction Nanoflakes Synthesized via Submerged DC Electrical Discharge in Urea Solution

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