Enhancement Photocatalytic Activity of the Heterojunction of Two-Dimensional Hybrid Semiconductors ZnO/V2O5

In this work, we report the fabrication of the new heterojunction of two 2D hybrid layered semiconductors—ZnO (stearic acid)/V2O5 (hexadecylamine)—and its behavior in the degradation of aqueous methylene blue under visible light irradiation. The optimal photocatalyst efficiency, reached at a ZnO (stearic acid)/V2O5 (hexadecylamine) ratio of 1:0.25, results in being six times higher than that of pristine zinc oxide. Reusability test shows that after three photocatalysis cycles, no significant changes in either the dye degradation efficiency loss, nor the photocatalyst structure, occur. Visible light photocatalytic performance observed indicates there is synergetic effect between both 2D nanocomposites used in the heterojunction. The visible light absorption enhancement promoted by the narrower bandgap V2O5 based components; an increased photo generated charge separation favored by extensive interface area; and abundance of hydrophobic sites for dye adsorption appear as probable causes of the improved photocatalytic efficiency in this hybrid semiconductors heterojunction. Estimated band-edge positions for both conduction and valence band of semiconductors, together with experiments using specific radical scavengers, allow a plausible photodegradation mechanism.

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Enhancement Photocatalytic Activity of the Heterojunction of Two-Dimensional Hybrid Semiconductors ZnO/V2O5

10.20944/preprints201807.0583.v1 ◽

2018 ◽

Author(s):

Juan Aliaga ◽

Nasla Cifuentes ◽

Guillermo Gonzalez ◽

Clivia Sotomayor-Torres ◽

Eglantina Benavente

Keyword(s):

Stearic Acid ◽

Visible Light ◽

Photocatalytic Performance ◽

Dye Degradation ◽

Synergetic Effect ◽

Dye Adsorption ◽

Absorption Enhancement ◽

Interface Area ◽

Photodegradation Mechanism ◽

Hybrid Semiconductors

In this work, we report the fabrication of the new heterojunction of two 2D hybrid layered semiconductors, ZnO(stearic acid)/V2O5(hexadecylamine), and its behavior in the degradation of aqueous methylene blue under visible light irradiation. The optimal photocatalyst efficiency, reached at a ZnO(stearic acid)/ V2O5(hexadecylamine) ratio of 1:0.25, results to be about six times higher than that of pristine zinc oxide. Reusability test shows that after three photocatalysis cycles no significant changes in neither the dye degradation efficiency loss nor photocatalyst structure occur. Visible light photocatalytic performance observed indicates there is synergetic effect between both 2D nanocomposites used in the heterojunction. The visible light absorption enhancement promoted by the narrower bandgap V2O5 based components; an increased photo generated charge separation favored by extensive interface area; and abundance of hydrophobic sites for dye adsorption appear as probable causes of the improved photocatalytic efficiency in this hybrid semiconductors heterojunction. Estimated band-edge positions for both conduction and valence band of semiconductors together with experiments using specific radical scavengers allow a plausible photodegradation mechanism.

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The Influence of Soaking Time on Photocatalytic Performance of g-C3N4 under Visible Light Irradiation

Key Engineering Materials ◽

10.4028/www.scientific.net/kem.862.1 ◽

2020 ◽

Vol 862 ◽

pp. 1-6

Author(s):

Tanaporn Narkbuakaew ◽

Pornapa Sujaridworakun

Keyword(s):

Visible Light ◽

Visible Light Irradiation ◽

High Performance ◽

Photocatalytic Performance ◽

Dye Degradation ◽

Dye Adsorption ◽

Light Irradiation ◽

Composition Analysis ◽

Soaking Time ◽

The Fourier Transform

In this research, visible-light responsive g-C3N4, photocatalyst was achieved through the simple calcination of urea at 600 °C by using the muffle furnace. The effects of calcination soaking time on preparation of high performance g-C3N4 were studied at 1, 2, 3, and 4 h. The g-C3N4 prepared at various soaking times were characterized by the X-ray diffraction (XRD) for crystallographic information and the Fourier-transform infrared spectroscopy (FTIR) for chemical composition analysis. Further, in the case of morphology and surface area of prepared photocatalysts, the Transmission Electron Microscope (TEM) and Brunauer, Emmett and Teller (BET) were applied. The results demonstrated that g-C3N4 with tri-s-triazine based units could be synthesized by calcination of urea at 600 °C and soaking for 1-4 h, as evidently confirmed by XRD and FTIR. For photocatalytic performance in rhodamine B dye degradation under visible light irradiation of achieved g-C3N4 tended to increase as soaking time increased. Moreover, the dye adsorption ability of prepared photocatalysts was obviously developed upon increase of soaking times. Herein, the highest photocatalytic performance was obtained from sample which was soaked at 4 h.

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Enhanced Visible-Light Photocatalytic Performance of SAPO-5-Based g-C3N4 Composite for Rhodamine B (RhB) Degradation

Materials ◽

10.3390/ma12233948 ◽

2019 ◽

Vol 12 (23) ◽

pp. 3948

Author(s):

Lingfang Qiu ◽

Zhiwei Zhou ◽

Mengfan Ma ◽

Ping Li ◽

Jinyong Lu ◽

...

Keyword(s):

Photocatalytic Activity ◽

Visible Light ◽

Redox Reactions ◽

Photocatalytic Performance ◽

Dye Degradation ◽

Thermal Polymerization ◽

Light Illumination ◽

Electron Hole ◽

Visible Light Illumination ◽

Visible Light Photocatalytic

Novel visible-light responded aluminosilicophosphate-5 (SAPO-5)/g-C3N4 composite has been easily constructed by thermal polymerization for the mixture of SAPO-5, NH4Cl, and dicyandiamide. The photocatalytic activity of SAPO-5/g-C3N4 is evaluated by degrading RhB (30 mg/L) under visible light illumination (λ > 420 nm). The effects of SAPO-5 incorporation proportion and initial RhB concentration on the photocatalytic performance have been discussed in detail. The optimized SAPO-5/g-C3N4 composite shows promising degradation efficiency which is 40.6% higher than that of pure g-C3N4. The degradation rate improves from 0.007 min−1 to 0.022 min−1, which is a comparable photocatalytic performance compared with other g-C3N4-based heterojunctions for dye degradation. The migration of photo-induced electrons from g-C3N4 to the Al site of SAPO-5 should promote the photo-induced electron-hole pairs separation rate of g-C3N4 efficiently. Furthermore, the redox reactions for RhB degradation occur on the photo-induced holes in the g-C3N4 and Al sites in SAPO-5, respectively. This achievement not only improves the photocatalytic activity of g-C3N4 efficiently, but also broadens the application of SAPOs in the photocatalytic field.

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Enhanced Photocatalytic Performance of Sn6SiO8 Nanoparticles and Their Reduced Graphene Oxide (rGO) Nanocomposite

Journal of Nanoscience and Nanotechnology ◽

10.1166/jnn.2020.17814 ◽

2020 ◽

Vol 20 (9) ◽

pp. 5426-5432

Author(s):

G. Gnanamoorthy ◽

M. Muthukumaran ◽

P. Varun Prasath ◽

V. Karthikeyan ◽

V. Narayanan ◽

...

Keyword(s):

Visible Light ◽

Photocatalytic Performance ◽

Separation Efficiency ◽

Dye Degradation ◽

Hexagonal Phase ◽

Active Species ◽

Organic Chemical ◽

Light Illumination ◽

Sem Images ◽

Radical Trapping

Photocatalysts provide excellent potential for the full removal of organic chemical pollutants as an environmentally friendly technology. It has been noted that under UV-visible light irradiation, nanostructured semiconductor metal oxides photocatalysts can degrade different organic pollutants. The Sn6SiO8/rGO nanocomposite was synthesized by a hydrothermal method. The Sn6SiO8 nanoparticles hexagonal phase was confirmed by XRD and functional groups were analyzed by FT-IR spectroscopy. The bandgap of Sn6SiO8 nanoparticles (NPs) and Sn6SiO8/GO composites were found to be 2.7 eV and 2.5 eV, respectively. SEM images of samples showed that the flakes like morphology. This Sn6SiO8/rGO nanocomposite was testing for photocatalytic dye degradation of MG under visible light illumination and excellent response for the catalysts. The enhancement of photocatalytic performance was mainly attributed to the increased light absorption, charge separation efficiency and specific surface area, proved by UV-vis DRS. Further, the radical trapping experiments revealed that holes (h+) and superoxide radicals (·O−2) were the main active species for the degradation of MG, and a possible photocatalytic mechanism was discussed.

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Sulfur-doping synchronously ameliorating band energy structure and charge separation achieving decent visible-light photocatalysis of Bi2O2CO3

RSC Advances ◽

10.1039/c6ra04888a ◽

2016 ◽

Vol 6 (97) ◽

pp. 94361-94364 ◽

Cited By ~ 11

Author(s):

Hongwei Huang ◽

Ke Xiao ◽

Fan Dong ◽

Jinjian Wang ◽

Xin Du ◽

...

Keyword(s):

Visible Light ◽

Charge Separation ◽

Photocatalytic Performance ◽

Dye Degradation ◽

Wide Band ◽

Energy Structure ◽

Wide Band Gap ◽

Band Energy ◽

Sulfur Doping ◽

Visible Light Photocatalytic

Sulfur doping simultaneously endows the wide-band-gap Bi2O2CO3 promoted band energy structure and charge separation achieving enhanced visible-light photocatalytic performance for dye degradation and NO removal.

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Enhanced photocatalytic performance of BiOBr/NH2-MIL-125(Ti) composite for dye degradation under visible light

Dalton Transactions ◽

10.1039/c6dt02912d ◽

2016 ◽

Vol 45 (43) ◽

pp. 17521-17529 ◽

Cited By ~ 90

Author(s):

Shuai-Ru Zhu ◽

Peng-Fei Liu ◽

Meng-Ke Wu ◽

Wen-Na Zhao ◽

Guo-Chang Li ◽

...

Keyword(s):

Photocatalytic Activity ◽

Visible Light ◽

Photocatalytic Performance ◽

Dye Degradation ◽

Composite Photocatalysts

BiOBr/NH2-MIL-125(Ti) composite photocatalysts have been prepared by incorporating NH2-MIL-125(Ti) with BiOBr and exhibited improved photocatalytic activity under visible light compared to pristine BiOBr and NH2-MIL-125(Ti).

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Natural biological template for ZnO nanoparticle growth and photocatalytic dye degradation under visible light

RSC Advances ◽

10.1039/c5ra16389g ◽

2015 ◽

Vol 5 (103) ◽

pp. 84406-84409 ◽

Cited By ~ 11

Author(s):

Mengxiao Sun ◽

Tianhang Li ◽

Zhaoyuan Zhang ◽

Nana Wang ◽

Aming Xie ◽

...

Keyword(s):

Visible Light ◽

Zno Nanoparticles ◽

Photocatalytic Performance ◽

Dye Degradation ◽

Zno Nanoparticle ◽

Nanoparticle Growth ◽

Photocatalytic Dye Degradation ◽

Luffa Sponge

Luffa sponge was used as a biotemplate for the growth of ZnO nanoparticles. This new structure of ZnO displayed a unique photocatalytic performance for dye degradation under visible light.

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Multiple heterojunction system of Bi2MoO6/WO3/Ag3PO4 with enhanced visible-light photocatalytic performance towards dye degradation

Advanced Powder Technology ◽

10.1016/j.apt.2019.06.010 ◽

2019 ◽

Vol 30 (9) ◽

pp. 1910-1919 ◽

Cited By ~ 15

Author(s):

Haisheng Zhang ◽

Dan Yu ◽

Wei Wang ◽

Pin Gao ◽

Kaixuan Bu ◽

...

Keyword(s):

Visible Light ◽

Photocatalytic Performance ◽

Dye Degradation ◽

Visible Light Photocatalytic

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Enhanced visible-light photocatalytic performance of BiOBr/UiO-66(Zr) composite for dye degradation with the assistance of UiO-66

RSC Advances ◽

10.1039/c5ra04869a ◽

2015 ◽

Vol 5 (49) ◽

pp. 39592-39600 ◽

Cited By ~ 61

Author(s):

Zhou Sha ◽

Jishan Wu

Keyword(s):

Visible Light ◽

High Activity ◽

Rhodamine B ◽

Photocatalytic Performance ◽

Dye Degradation ◽

Catalyst Stability ◽

Good Catalyst ◽

Visible Light Photocatalytic

A BiOBr/UiO-66(Zr) composite was used as visible-light promoted photocatalyst for the degradation of rhodamine B with high activity and good catalyst stability.

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