Novel metal-free N-doped bio-graphenes and their MoO3 bifunctional catalysts for ultra-deep oxidative desulfurization of heavy fuel

Afsharpour, Maryam; Gomi, Leila Seifikar; Elyasi, Mehdi

doi:10.1016/j.seppur.2021.119014

Cited by 23 publications

(10 citation statements)

References 45 publications

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“…In the T-BG sample, the pyrrolic N is dominant. Previous results show that these nitrogen species are effective in catalytic oxidative reactions [43][44][45][46]. The amounts of nitrogen were measured as 4.5, 5.1, and 4 for X-BG, C-BG, and T-BG, respectively, which is in agreement with the EDX analysis.…”

Section: Characterization Of Synthesized Bio-graphenessupporting

confidence: 88%

In Situ Synthesis of Doped Bio-Graphenes as Effective Metal-Free Catalysts in Removal of Antibiotics: Effect of Natural Precursor on Doping, Morphology, and Catalytic Activity

Afsharpour,

Radmanesh,

Yang

2023

Molecules

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Wastewater contaminated with antibiotics is a major environmental challenge. The oxidation process is one of the most common and effective ways to remove these pollutants. The use of metal-free, green, and inexpensive catalysts can be a good alternative to metal-containing photocatalysts in environmental applications. We developed here the green synthesis of bio-graphenes by using natural precursors (Xanthan, Chitosan, Boswellia, Tragacanth). The use of these precursors can act as templates to create 3D doped graphene structures with special morphology. Also, this method is a simple method for in situ synthesis of doped graphenes. The elements present in the natural biopolymers (N) and other elements in the natural composition (P, S) are easily placed in the graphene structure and improve the catalytic activity due to the structural defects, surface charges, increased electron transfers, and high absorption. The results have shown that the hollow cubic Chitosan-derived graphene has shown the best performance due to the doping of N, S, and P. The Boswellia-derived graphene shows the highest surface area but a lower catalytic performance, which indicates the more effective role of doping in the catalytic activity. In this mechanism, O2 dissolved in water absorbs onto the positively charged C adjacent to N dopants to create oxygenated radicals, which enables the degradation of antibiotic molecules. Light irradiation increases the amount of radicals and rate of antibiotic removal.

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Section: Characterization Of Synthesized Bio-graphenessupporting

confidence: 88%

In Situ Synthesis of Doped Bio-Graphenes as Effective Metal-Free Catalysts in Removal of Antibiotics: Effect of Natural Precursor on Doping, Morphology, and Catalytic Activity

Afsharpour,

Radmanesh,

Yang

2023

Molecules

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“…It causes a change in the value of pHzpc from 8.24 for NPBG to 7.1 for WO3/NPBG-NC. According to other studies [33,48], the difference in the electronegativity of C and N atoms in the structure of NBG causes a positive charge in C atoms. These positively charged C atoms in the structure of NBG can adsorb O 2 and produce reactive oxygenated radical species that can decompose the dye, even in dark conditions [48].…”

Section: Photocatalytic Studymentioning

confidence: 79%

“…The XRD pattern of the NPBG displays two diffraction peaks at 2θ = 25.6° and 43.2° that were assigned to the (002) and (100) planes of the carbon phase in the NPBG, respectively. In comparison with the undoped graphene, the major peak is weaker and observed at a higher 2θ (25.6° (doped) vs. 22.3° (undoped)) [33]. The XRD pattern of WO3/NPBG-NC displays the appearance of diffraction peaks at 2θ = 16.6°, 27.5°, 32.3°, 43.1°, 48.8°, 51.0°, 56.7°, 59.0°, and 64.2°, which were assigned to (020), ( 111), ( 200), ( 122), ( 202), ( 222), ( 232), (331), and (351) planes of the orthorhombic WO3.H2O (JCPDS 84-0886).…”

Section: Characterizationmentioning

confidence: 86%

“…The XRD pattern of the NPBG displays two diffraction peaks at 2θ = 25.6 • and 43.2 • that were assigned to the (002) and (100) planes of the carbon phase in the NPBG, respectively. In comparison with the undoped graphene, the major peak is weaker and observed at a higher 2θ (25.6 • (doped) vs. 22.3 • (undoped)) [33]. The XRD pattern of WO 3 /NPBG-NC displays the appearance of diffraction peaks at 2θ = 16.6 • , 27.…”

Section: Characterizationmentioning

confidence: 93%

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A Novel N-Doped Nanoporous Bio-Graphene Synthesized from Pistacia lentiscus Gum and Its Nanocomposite with WO3 Nanoparticles: Visible-Light-Driven Photocatalytic Activity

2021

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This paper reports the synthesis of a new nitrogen-doped porous bio-graphene (NPBG) with a specific biomorphic structure, using Pistacia lentiscus as a natural carbon source containing nitrogen that also acts as a bio-template. The obtained NPBG demonstrated the unique feature of doped nitrogen with a 3D nanoporous structure. Next, a WO3/N-doped porous bio-graphene nanocomposite (WO3/NPBG-NC) was synthesized, and the products were characterized using XPS, SEM, TEM, FT-IR, EDX, XRD, and Raman analyses. The presence of nitrogen doped in the structure of the bio-graphene (BG) was confirmed to be pyridinic-N and pyrrolic-N with N1 peaks at 398.3 eV and 400.5 eV, respectively. The photocatalytic degradation of the anionic azo dyes and drugs was investigated, and the results indicated that the obtained NPBG with a high surface area (151.98 m2/g), unique electronic properties, and modified surface improved the adsorption and photocatalytic properties in combination with WO3 nanoparticles (WO3-NPs) as an effective visible-light-driven photocatalyst. The synthesized WO3/NPBG-NC with a surface area of 226.92 m2/g displayed lower bandgap and higher electron transfer compared with blank WO3-NPs, leading to an increase in the photocatalytic performance through the enhancement of the separation of charge and a reduction in the recombination rate. At the optimum conditions of 0.015 g of the nanocomposite, a contact time of 15 min, and 100 mg/L of dyes, the removal percentages were 100%, 99.8%, and 98% for methyl red (MR), Congo red (CR), and methyl orange (MO), respectively. In the case of the drugs, 99% and 87% of tetracycline and acetaminophen, respectively, at a concentration of 10 mg/L, were removed after 20 min.

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“…161 They investigated them for ODS of various S compounds in an octanal−air system, and promising desulfurization efficiencies were achieved. Most recently, Afsharpour et al 162 investigated Ndoped biographenes for ODS of DBT in n-octane with H 2 O 2 as the oxidant. In the synthesis, sonicated solutions of arabic gum as the carbon precursor with various N precursors (urea, hexamethyleneteramine, and ethylenediamine) were dried and subsequently pyrolyzed at 700 °C for 1 h under a N 2 atmosphere.…”

Section: Metal-free Catalytic Odsmentioning

confidence: 99%

Metal-Free Catalytic Oxidative Desulfurization of Fuels─A Review

Tanimu

Ganiyu

et al. 2022

Energy Fuels

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Overdependence of energy consumption around fossil fuels is threatening our environment from different anthropogenic emissions of pollutants. These pollutants (CO x , NO x , and SO x ) resulting from combustion activities of crude oil and petroleum products are life-threatening. Desulfurization of fuels is an important matter that constantly requires attention from the relevant stakeholders for environmental, economic, and social benefits. Hydrodesulfurization required to lower the sulfur content in the crude oil comes at high operating conditions and cost, especially toward achieving ultradeep desulfurization of <10 or 0 ppm as required for fuel cell catalytic converters. In the recent decades, oxidative desulfurization (ODS) is gaining fast interest among the few alternatives proposed as a complementary approach. This paper reviews the current advances in the metal-free catalytic ODS owing to the effectiveness and promising results in the light of safety, cost, and environmental concerns compared to conventional metal-containing catalytic ODS strategies. Special contributions related to graphitic materials, nitrides, carbides, ionic liquids, deep eutectic solvents, and porous organic polymers with respect to the broad classification of organic, inorganic, and hybrid (organic–inorganic) metal-free catalysts and their mechanism of catalyzing the oxidation process are thoroughly reviewed. The challenges, improvements, merits, and future prospects are discussed in the context of industrial feasibility for strategic plans and further studies.

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Novel metal-free N-doped bio-graphenes and their MoO3 bifunctional catalysts for ultra-deep oxidative desulfurization of heavy fuel

Cited by 23 publications

References 45 publications

In Situ Synthesis of Doped Bio-Graphenes as Effective Metal-Free Catalysts in Removal of Antibiotics: Effect of Natural Precursor on Doping, Morphology, and Catalytic Activity

In Situ Synthesis of Doped Bio-Graphenes as Effective Metal-Free Catalysts in Removal of Antibiotics: Effect of Natural Precursor on Doping, Morphology, and Catalytic Activity

A Novel N-Doped Nanoporous Bio-Graphene Synthesized from Pistacia lentiscus Gum and Its Nanocomposite with WO3 Nanoparticles: Visible-Light-Driven Photocatalytic Activity

Metal-Free Catalytic Oxidative Desulfurization of Fuels─A Review

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