Novel siligraphene/g-C3N4 composites with enhanced visible light photocatalytic degradations of dyes and drugs

Darvishi-Farash, Somayeh; Afsharpour, Maryam; Heidarian, Javad

doi:10.1007/s11356-020-10969-9

Cited by 26 publications

(10 citation statements)

References 44 publications

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“…Experimentally porous and N and N, S co-doped SiC have been tested for the removal of anionic azo dyes (Congo red, Methyl orange, and Methyl red) in absence of light [222]. Siligraphene/g-C 3 N 4 heterostructures are utilized for similar dye degradation with enhanced visible light [223].…”

Section: Siligraphene and Germagraphenementioning

confidence: 99%

Emerging properties of carbon based 2D material beyond graphene

Jana

Bandyopadhyay

Datta

et al. 2021

J. Phys.: Condens. Matter

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Graphene turns out to be the pioneering material for setting up boulevard to a new zoo of recently proposed carbon based novel two dimensional (2D) analogues. It is evident that their electronic, optical and other related properties are utterly different from that of graphene because of the distinct intriguing morphology. For instance, the revolutionary emergence of Dirac cones in graphene is particularly hard to find in most of the other 2D materials. As a consequence the crystal symmetries indeed act as a major role for predicting electronic band structure. Since tight binding calculations have become an indispensable tool in electronic band structure calculation, we indicate the implication of such method in graphene’s allotropes beyond hexagonal symmetry. It is to be noted that some of these graphene allotropes successfully overcome the inherent drawback of the zero band gap nature of graphene. As a result, these 2D nanomaterials exhibit great potential in a broad spectrum of applications, viz nanoelectronics, nanooptics, gas sensors, gas storages, catalysis, and other specific applications. The miniaturization of high performance graphene allotrope based gas sensors to microscopic or even nanosized range has also been critically discussed. In addition, various optical properties like the dielectric functions, optical conductivity, electron energy loss spectra reveal that these systems can be used in opto-electronic devices. Nonetheless, the honeycomb lattice of graphene is not superconducting. However, it is proposed that the tetragonal form of graphene can be intruded to form new hybrid 2D materials to achieve novel superconducting device at attainable conditions. These dynamic experimental prospects demand further functionalization of these systems to enhance the efficiency and the field of multifunctionality. This topical review aims to highlight the latest advances in carbon based 2D materials beyond graphene from the basic theoretical as well as future application perspectives.

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Section: Siligraphene and Germagraphenementioning

confidence: 99%

Emerging properties of carbon based 2D material beyond graphene

Jana

Bandyopadhyay

Datta

et al. 2021

J. Phys.: Condens. Matter

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“…Figure 9 also displays the photocatalytic performances of synthesized NBG, NPBG, and WO 3 /NPBG-NC. As can be seen, light irradiation can activate the catalyst and enhance the dye removal via the photocatalytic mechanism [20]. The TOC removal of CR solution was also studied under dark and light irradiation conditions (Figure 10).…”

Section: Photocatalytic Studymentioning

confidence: 98%

“…Metal oxides, such as titanium dioxide, zinc oxide, and tungsten oxide, as well as some metal-free compounds, such as g-C 3 N 4 and SiC, are semiconductors with interesting advantages in removing pollutants via AOPs [20][21][22][23][24][25][26]. Among the photocatalysts used in AOPs, the attractive properties of tungsten oxide have been demonstrated by researchers [27][28][29].…”

Section: Introductionmentioning

confidence: 99%

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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“…Recently, with the introduction of new technologies, new solutions such as novel photocatalysts, membranes, and environmentally friendly adsorbents have been introduced for wastewater treatments 3 – 6 . Photocatalysts are an important class of nanomaterials used in the purification of heavily polluted water and are very effective when other purification methods are not useful or economical 7 – 10 .…”

Section: Introductionmentioning

confidence: 99%

Novel synthesis of siligraphene/tungstates (g-SiC/AWO) with promoted transportation of photogenerated charge carriers via direct Z-scheme heterojunctions

Afsharpour

Darvishi-Farash

2023

Sci Rep

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We developed here the efficient photocatalysts for the removal of high concentrations of tetracycline under visible light by immobilizing the AWO (A = Ag, Bi, Na) nanocrystals on the surface of siligraphene (g-SiC) nanosheets. The g-SiC/AWO composites was synthesized by magnesiothermic synthesis of g-SiC and sonochemical immobilization of tungstates. These new heterojunctions of g-SiC/tungstates show superior photocatalytic activities in the degradation of high concentrations of tetracycline and 97, 98, and 94% of tetracycline were removed by using low amounts of g-SiC/Ag2WO4, g-SiC/Bi2WO6, and g-SiC/Na2WO4 catalysts, respectively. Based on band structures, the band gaps reduce and the photocatalytic activities were extremely enhanced due to the shortening of electron transfer distance through the Z-scheme mechanism. Also, the graphenic structure of g-SiC is another parameter that was effective in improving photocatalytic performance by increasing the electron transfer and decreasing the rate of electron–hole recombination. Furthermore, the π back-bonding of g-SiC with metal atoms increases the electron–hole separation to enhance the photocatalytic activity. Interestingly, g-SiC composites (g-SiC/AWO) showed much higher photocatalytic properties compared to graphene composites (gr/AWO) and can remove the tetracycline even at dark by producing the oxygenated radicals via adsorption of oxygen on the positive charge of Si atoms in siligraphene structure.

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Novel siligraphene/g-C3N4 composites with enhanced visible light photocatalytic degradations of dyes and drugs

Cited by 26 publications

References 44 publications

Emerging properties of carbon based 2D material beyond graphene

Emerging properties of carbon based 2D material beyond graphene

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

Novel synthesis of siligraphene/tungstates (g-SiC/AWO) with promoted transportation of photogenerated charge carriers via direct Z-scheme heterojunctions

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