Understanding the energy level matching relationships between semiconductor photocatalysts and organic pollutants for effective photocatalytic degradations

Tong, Haixia; Zhan, Xiaojun; Tian, Xiong; Li, Junhua; Qian, Dong; Wu, Daoxin

doi:10.1016/j.jcis.2018.05.009

Cited by 50 publications

(16 citation statements)

References 38 publications

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“…The photocatalytic performance was first evaluated with hexavalent chromium, as shown in Figure 8 a. Indicatively, the solution’s pH was equal to 1.7, so the catalyst’s surface was positively charged and the chromium complexes adsorption should be promoted. Moreover, the conduction band potential of V 2 O 5 is less negative than the chromium redox potential from hexavalent to trivalent [ 39 ], thus, the reduction should occur as follows: Cr 2 O 7 2− +6e − + 14H + → 2Cr 3+ + 7H 2 O, E 0 Cr(VI)/Cr(III) = 1.33 V.…”

Section: Resultsmentioning

confidence: 99%

Surfactant Effects on the Synthesis of Redox Bifunctional V2O5 Photocatalysts

et al. 2020

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Novel V2O5 bifunctional photocatalysts were prepared following a wet chemical process with the addition of anionic or non-ionic surfactants into the precursor solution and further heating under reflux. Detailed characterization and investigation of the relevant light-matter interactions proved that surfactants addition had a strong impact on the morphology, while also affecting the crystallinity, the optoelectronic properties, and the surface chemistry of the novel photocatalysts. The most efficient photocatalyst (T80) was based on tween 80, a surface-active agent employed for the first time in the synthesis of vanadium oxide materials. T80 presented crystalline nature without structural defects, which are usually centers of e− − h+ recombination. This material also exhibited small crystal size, high porosity, and short migration paths for the charge carriers, enabling their effective separation during photocatalysis. Under UV light illumination, T80 was capable to reduce hexavalent chromium to trivalent up to 70% and showed high yields in degrading methylene blue azo-dye and tetracycline antibiotic water pollutants. This remarkably high bifunctional performance defines T80 as a promising and capable photocatalytic material for both advanced oxidation and reduction processes (AOPs-ARPs).

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Section: Resultsmentioning

confidence: 99%

Surfactant Effects on the Synthesis of Redox Bifunctional V2O5 Photocatalysts

et al. 2020

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“…For instance, frontier orbital energies (HOMO–LUMO gap) between E HOMO and E LUMO of some model organic pollutants are as followings: methylene blue (MB): 2.49 eV; rhodamine‐B (RhB): 2.84 eV; rhodamine‐640 (Rh640): 2.74 eV; phenol: 0.51 eV. [ 102 , 103 ] The easiness of modifiable energy bandgaps of MOF derived composites can offer a better strategy to match the degradation energy levels of the pollutants. In 2010, Yang et al.…”

Section: Mof Derived Nanocomposites For Photocatalytic Applicationsmentioning

confidence: 99%

Recent Advances in Metal–Organic Frameworks Derived Nanocomposites for Photocatalytic Applications in Energy and Environment

et al. 2021

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Solar energy is a key sustainable energy resource, and materials with optimal properties are essential for efficient solar energy-driven applications in photocatalysis. Metal-organic frameworks (MOFs) are excellent platforms to generate different nanocomposites comprising metals, oxides, chalcogenides, phosphides, or carbides embedded in porous carbon matrix. These MOF derived nanocomposites offer symbiosis of properties like high crystallinities, inherited morphologies, controllable dimensions, and tunable textural properties. Particularly, adjustable energy band positions achieved by in situ tailored self/external doping and controllable surface functionalities make these nanocomposites promising photocatalysts. Despite some progress in this field, fundamental questions remain to be addressed to further understand the relationship between the structures, properties, and photocatalytic performance of nanocomposites. In this review, different synthesis approaches including self-template and external-template methods to produce MOF derived nanocomposites with various dimensions (0D, 1D, 2D, or 3D), morphologies, chemical compositions, energy bandgaps, and surface functionalities are comprehensively summarized and analyzed. The state-of-the-art progress in the applications of MOF derived nanocomposites in photocatalytic water splitting for H 2 generation, photodegradation of organic pollutants, and photocatalytic CO 2 reduction are systemically reviewed. The relationships between the nanocomposite properties and their photocatalytic performance are highlighted, and the perspectives of MOF derived nanocomposites for photocatalytic applications are also discussed.

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“…[3] Recent research has proved that by using appropriate photocatalysts, aqueous organic pollutants such as methyl blue, methyl red, methyl orange can be converted into water, carbon dioxide, and non-hazardous inorganic compounds. [4,5] More than 10,000 different types of synthetic colors are annually produced and used in various textile and dyeing, [6] cosmetics, [7] leather, [8] and pharmaceuticals industries. Among the textile dyes, [9] Azo compound, which has a color group 1 N N in its molecular structure as the largest group dyeing materials, is used in the textile industry.…”

Section: Introductionmentioning

confidence: 99%

One‐step ultrasonic production of the chitosan/lactose/g‐C₃N₄ nanocomposites with lactose as a biological capping agent: Photocatalytic activity study

Karimi

Ranjbar

Mohadesi

2021

J Chinese Chemical Soc

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In this work, the basic and applied purpose was to synthesize and modify chitosan/lactose nanocomposites with g-C 3 N 4 structures using the ultrasonic-assisted electrospinning method. We evaluated effective photocatalytic of chitosan/lactose/g-C 3 N 4 nanocomposites to photodegrade methyl red, methyl orange, and methyl blue in different nanophotocatalyst concentration such as 0.1-1%g/L in pH 6.5. According to the experimental results, it was found that nanocomposites in different concentrations of g-C 3 N 4 had high potential in degradation of organic compounds. The lactose structures as a green capping agent and stabilizer modified chitosan surfaces to produce uniform particle size distribution. Different lactose concentrations like 0.1-0.5%wt/vol indicate a particle size range between 270 and 422 nm. The obtained as-synthesized nanomaterials were characterized by scanning electron microscope, energy-dispersive X-ray spectroscopy, transmission electron microscopy, X-ray diffraction (XRD), Fourier-transform

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Understanding the energy level matching relationships between semiconductor photocatalysts and organic pollutants for effective photocatalytic degradations

Cited by 50 publications

References 38 publications

Surfactant Effects on the Synthesis of Redox Bifunctional V2O5 Photocatalysts

Surfactant Effects on the Synthesis of Redox Bifunctional V2O5 Photocatalysts

Recent Advances in Metal–Organic Frameworks Derived Nanocomposites for Photocatalytic Applications in Energy and Environment

One‐step ultrasonic production of the chitosan/lactose/g‐C₃N₄ nanocomposites with lactose as a biological capping agent: Photocatalytic activity study

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Understanding the energy level matching relationships between semiconductor photocatalysts and organic pollutants for effective photocatalytic degradations

Cited by 50 publications

References 38 publications

Surfactant Effects on the Synthesis of Redox Bifunctional V2O5 Photocatalysts

Surfactant Effects on the Synthesis of Redox Bifunctional V2O5 Photocatalysts

Recent Advances in Metal–Organic Frameworks Derived Nanocomposites for Photocatalytic Applications in Energy and Environment

One‐step ultrasonic production of the chitosan/lactose/g‐C3N4 nanocomposites with lactose as a biological capping agent: Photocatalytic activity study

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Product

Resources

About

One‐step ultrasonic production of the chitosan/lactose/g‐C₃N₄ nanocomposites with lactose as a biological capping agent: Photocatalytic activity study