Green synthesis of bio-based Au@g-C3N4 nanocomposite for photocatalytic degradation of methyl orange

Mishra, Pravat Manjari; Pattnaik, Subnam; Devi, Aparna Prabha

doi:10.1016/j.matpr.2021.03.712

Cited by 8 publications

(2 citation statements)

References 14 publications

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“…Apart from these, some metals/metallic compounds, such as Au [ 105 ], CoO x [ 106 ], Co 3 O 4 [ 107 ], ZnO [ 108 ], SrTiO 3 [ 109 ], Gd 2 O 3 [ 110 ], and MnOx [ 111 ], were coupled to form g-C 3 N 4 composite/heterojunctions for enhanced photodegradation of MO dyes.…”

Section: Composites and Heterojunctionsmentioning

confidence: 99%

g-C3N4 Based Photocatalyst for the Efficient Photodegradation of Toxic Methyl Orange Dye: Recent Modifications and Future Perspectives

et al. 2023

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Industrial effluents containing dyes are the dominant pollutants, making the drinking water unfit. Among the dyes, methylene orange (MO) dye is mutagenic, carcinogenic and toxic to aquatic organisms. Therefore, its removal from water bodies through effective and economical approach is gaining increased attention in the last decades. Photocatalytic degradation has the ability to convert economically complex dye molecules into non-toxic and smaller species via redox reactions, by using photocatalysts. g-C3N4 is a metal-free n-type semiconductor, typical nonmetallic and non-toxici polymeric photocatalyst. It widely used in photocatalytic materials, due to its easy and simple synthesis, fascinating electronic band structure, high stability and abundant availability. As a photocatalyst, its major drawbacks are its limited efficiency in separating photo-excited electron–hole pairs, high separated charge recombination, low specific surface area, and low absorption coefficient. In this review, we report the recent modification strategies adopted for g-C3N4 for the efficient photodegradation of MO dye. The different modification approaches, such as nanocomposites and heterojunctions, as well as doping and defect introductions, are briefly discussed. The mechanism of the photodegradation of MO dye by g-C3N4 and future perspectives are discussed. This review paper will predict strategies for the fabrication of an efficient g-C3N4-based photocatalyst for the photodegradation of MO dye.

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Section: Composites and Heterojunctionsmentioning

confidence: 99%

g-C3N4 Based Photocatalyst for the Efficient Photodegradation of Toxic Methyl Orange Dye: Recent Modifications and Future Perspectives

et al. 2023

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“…Qiao's group demonstrated that phosphorus doping porous g-C 3 N 4 nanosheets can signifcantly lower the bandgap from 2.98 to 2.66 eV which creates more photo-excitation of electrons and holes [31][32][33][34]. Concerning the high electron-hole recombination rate of g-C 3 N 4 , it can be reduced by loading noble metals on its surface or creating junction with diferent other semiconductors such as TiO 2 /g-C 3 N 4 [35], graphene oxide/g-C 3 N 4 [36], Au/g-C 3 N 4 [37]/g-C 3 N 4 /α-Fe 2 O 3 [38], g-C 3 N 4 / Ag 2 O/TiO 2 [39], g-C 3 N 4 /Bi 2 WO 6 [40], Ag/g-C 3 N 4 [41], [42], Cu doped ZnO/g-C 3 N 4 [43], g-C 3 N 4 /Co 3 O 4 [44], BiOBr-NFs/g-C 3 N 4 -SAF [45], and Co 3 O 4 @CeO 2 [46], and ZnO is an inexpensive and nontoxic semiconductor material that has been utilized as a photocatalyst; however, due to its high band gap (3.2-3.3 eV), it is only active in the UV region of the solar spectrum [47][48][49]. Several literatures demonstrate that the ZnO-coupled g-C 3 N 4 composite has shown to increase the oxidation potential and removal efciency of inorganic and organic contaminants.…”

Section: Introductionmentioning

confidence: 99%

$g$ -C3N4–Co3O4 Z-Scheme Junction with Green-Synthesized ZnO Photocatalyst for Efficient Degradation of Methylene Blue in Aqueous Solution

Tamiru Mengistu,

Wondimu,

Andoshe

et al. 2023

Bioinorganic Chemistry and Applications

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A simple wet chemical ultrasonic-assisted synthesis method was employed to prepare visible light-driven g-C3N4-ZnO-Co3O4 (GZC) heterojunction photocatalysts. X-ray diffraction (XRD), scanning electromicroscopy (SEM), Fourier-transform infrared spectroscopy (FTIR), Brunauer–Emmett–Teller (BET), ultraviolet (UV), and electrochemical impedance spectroscopy (EIS) are used to characterize the prepared catalysts. XRD confirms the homogenous phase formation of g-C3N4, ZnO, and Co3O4, and the heterogeneous phase for the composites. The synthesized ZnO and Co3O4 by using cellulose as a template show a rod-like morphology. The specific surface area of the catalytic samples increases due to the cellulose template. The measurements of the energy band gap of a g-C3N4-ZnO-Co3O4 composite showed red-shifted optical absorption to the visible range. The photoluminescence (PL) intensity decreases due to the formation of heterojunction. The PL quenching and EIS result shows that the reduction of the recombination rate and interfacial resistance result in charge carrier kinetic improvement in the catalyst. The photocatalytic performance in the degradation of MB dye of the GZC-3 composite was about 8.2-, 3.3-, and 2.5-fold more than that of the g-C3N4, g-C3N4-ZnO, and g-C3N4-Co3O4 samples. The Mott–Schottky plots of the flat band edge position of g-C3N4, ZnO, Co3O4, and Z-scheme g-C3N4-ZnO-Co3O4 photocatalysts may be created. Based on the stability experiment, GZC-3 shows greater photocatalytic activity after four recycling cycles. As a result, the GZC composite is environmentally friendly and efficient photocatalyst and has the potential to consider in the treatment of dye-contaminated wastewater.

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Current scenario on biogenic synthesis of metal oxide nanocomposites using plant specimens and their application towards treatment of wastewater

Mishra,

Devi

2023

Environ Sci Pollut Res

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Green synthesis of bio-based Au@g-C3N4 nanocomposite for photocatalytic degradation of methyl orange

Cited by 8 publications

References 14 publications

g-C3N4 Based Photocatalyst for the Efficient Photodegradation of Toxic Methyl Orange Dye: Recent Modifications and Future Perspectives

g-C3N4 Based Photocatalyst for the Efficient Photodegradation of Toxic Methyl Orange Dye: Recent Modifications and Future Perspectives

$g$ -C3N4–Co3O4 Z-Scheme Junction with Green-Synthesized ZnO Photocatalyst for Efficient Degradation of Methylene Blue in Aqueous Solution

Current scenario on biogenic synthesis of metal oxide nanocomposites using plant specimens and their application towards treatment of wastewater

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Green synthesis of bio-based Au@g-C3N4 nanocomposite for photocatalytic degradation of methyl orange

Cited by 8 publications

References 14 publications

g-C3N4 Based Photocatalyst for the Efficient Photodegradation of Toxic Methyl Orange Dye: Recent Modifications and Future Perspectives

g-C3N4 Based Photocatalyst for the Efficient Photodegradation of Toxic Methyl Orange Dye: Recent Modifications and Future Perspectives

g -C3N4–Co3O4 Z-Scheme Junction with Green-Synthesized ZnO Photocatalyst for Efficient Degradation of Methylene Blue in Aqueous Solution

Current scenario on biogenic synthesis of metal oxide nanocomposites using plant specimens and their application towards treatment of wastewater

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$g$ -C3N4–Co3O4 Z-Scheme Junction with Green-Synthesized ZnO Photocatalyst for Efficient Degradation of Methylene Blue in Aqueous Solution