Photocatalytic degradation of malachite green and methylene blue over reduced graphene oxide (rGO) based metal oxides (rGO-Fe3O4/TiO2) nanocomposite under UV-visible light irradiation

Bibi, Sidra; Ahmad, Awais; Anjum, Mohsin Ali Raza; Haleem, Abdul; Siddiq, Muhammad; Shah, Syed Sakhawat; Kahtani, Abdullah Al

doi:10.1016/j.jece.2021.105580

Cited by 162 publications

(53 citation statements)

References 66 publications

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“…Due to their special properties such as cost-effective fabrication procedure, good chemical stability, eco-friendliness, high theoretical specific capacity, and abundant availability, transition metal oxides (TMOs) including Fe 2 O 3 , Co 3 O 4 , NiO and CuO have at-tracted considerable attention for use in various applications, including solar cells, photocatalysts, electrode materials, and gas sensors [11][12][13][14][15][16][17]. However, TMOs have some drawbacks such as low conductivity, pulverization, and aggregation caused by large volume expansion [18][19][20].…”

Section: Introductionmentioning

confidence: 99%

RETRACTED: Synthesis, Characterization and Photodegradation Studies of Copper Oxide–Graphene Nanocomposites

et al. 2021

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In this work, a simple hydrothermal method was employed to prepare a pristine sample of copper oxide (CuO) and three samples of copper oxide–graphene nanocomposites (CuO-xG) with x = 2.5, 5, and 10 mg of graphene. The synthesized samples were characterized using X-ray powder diffractometry (XRD), field emission scanning electron microscopy (FESEM), energy-dispersive X-ray spectroscopy (EDX), Fourier-transform infrared spectroscopy (FTIR) and ultraviolet–visible (UV-Vis) spectroscopy. The XRD patterns of CuO-xG nanocomposites exhibited the diffraction peaks related to the crystal planes of monoclinic CuO and hexagonal graphite. The surface morphology of the prepared samples was investigated using FESEM images. EDX analysis was used to investigate the chemical composition of the synthesized samples. FTIR spectroscopy identified the vibrational modes of the covalent bonds present in the samples. The allowed direct optical bandgap energy was calculated for all prepared samples using UV-Vis absorption spectra. The small bandgap of CuO-xG nanocomposites indicates their potential use as an effective photocatalyst in the presence of visible light. Photocatalytic activity of the samples was explored for the degradation of methylene blue (MB) dye contaminant under visible light irradiation. The results showed that the CuO-5G sample has the highest photodegradation efficiency (~56%).

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Section: Introductionmentioning

confidence: 99%

RETRACTED: Synthesis, Characterization and Photodegradation Studies of Copper Oxide–Graphene Nanocomposites

et al. 2021

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“…where η is the removal efficiency, and C o and C t correspond to the initial concentration and concentration of MB at any time interval (mg/L), respectively. The corresponding efficiency is comparatively much higher than that of TiO 2 (62%) for MB degradation [44]. The obtained dye degradation efficiency is shown in Figure 9b [45].…”

Section: Photocatalytic Dye Degradationmentioning

confidence: 83%

Photocatalytic and Biological Activity of ZnO Nanoparticles Using Honey

Sharmila¹,

Mani²,

Kader³

et al. 2021

Coatings

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The innovation and development of water purification methods have been at the center of extensive research for several decades. Many nanoparticles are frequently seen in industrial waste water. In this research, zinc oxide nanoparticles (ZnO) were synthesized following an autocombustion method with and without honey capping. Structural crystallinity and bonding structure were examined via X-ray diffraction (XRD) analysis and Fourier transform infrared (FTIR) spectroscopy. Optical behavior was analyzed using ultraviolet–visible (UV–Vis) spectroscopy and photoluminescence (PL). Size estimation and surface morphology were studied using scanning electron microscopy (SEM), while energy-dispersive spectroscopy (EDS) was performed to analyze the sample purity and elemental composition. The photocatalytic degradation of methylene blue (MB) by ZnO was assessed as it is an efficient water treatment process with high potential. The biological activity of ZnO nanoparticles was also investigated in terms of antibacterial and antifungal activities against different bacterial and fungal species. Surprisingly, the as-synthesized ZnO nanoparticles were found to be substantially bioactive compared to conventional drugs. Honey-mediated nanoparticles displayed 86% dye degradation efficiency, and that of bare ZnO was 60%. Therefore, the involvement of honey in the synthesis of ZnO nanoparticles has great potential due to its dual applicability in both biological and environmental remediation processes.

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“…The absorbance was measured later, at 515 nm, against a blank of methanol without DPPH. The results were calculated as the percentage inhibition of the DPPH according to the following equation: % inhibition of DPPH = [(Abs control-Abs sample)/Abs control] × 100, where Abs control is the absorbance of DPPH solution without extracts [40].…”

Section: Radical Scavenging Potentialmentioning

confidence: 99%

Antioxidant and Organic Dye Removal Potential of Cu-Ni Bimetallic Nanoparticles Synthesized Using Gazania rigens Extract

Younas

Gulzar

Ali

et al. 2021

Water

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Copper-nickel bimetallic nanoparticles (Cu-Ni BNPs) were fabricated using an eco-friendly green method of synthesis. An extract of synthesized Gazania rigens was used for the synthesis of BNPs followed by characterization employing different techniques including UV/Vis spectrophotometer, FTIR, XRD, and SEM. Spectrophotometric studies (UV-Vis and FTIR) confirmed the formation of bimetallic nanoparticles. The SEM studies indicated that the particle size ranged from 50 to 100 nm. Analysis of the BNPs by the XRD technique confirmed the presence of both Cu and Ni crystal structure. The synthesized nanoparticles were then tested for their catalytic potential for photoreduction of methylene blue dye in an aqueous medium and DPPH radical scavenging in a methanol medium. The BNPs were found to be efficient in the reduction of methylene blue dye as well as the scavenging of DPPH free radicals such that the MB dye was completely degraded in just 17 min at the maximum absorption of 660 nm. Therefore, it is concluded that Cu-Ni BNPs can be successfully synthesized using Gazania rigens extract with suitable size and potent catalytic and radical scavenging activities.

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Photocatalytic degradation of malachite green and methylene blue over reduced graphene oxide (rGO) based metal oxides (rGO-Fe3O4/TiO2) nanocomposite under UV-visible light irradiation

Cited by 162 publications

References 66 publications

RETRACTED: Synthesis, Characterization and Photodegradation Studies of Copper Oxide–Graphene Nanocomposites

RETRACTED: Synthesis, Characterization and Photodegradation Studies of Copper Oxide–Graphene Nanocomposites

Photocatalytic and Biological Activity of ZnO Nanoparticles Using Honey

Antioxidant and Organic Dye Removal Potential of Cu-Ni Bimetallic Nanoparticles Synthesized Using Gazania rigens Extract

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