Hydrogen peroxide–assisted photocatalytic dye degradation over reduced graphene oxide integrated ZnCr2O4 nanoparticles

Tantubay, Kartik; Das, Piu; Baskey, Moni

doi:10.1007/s11356-021-17105-1

Cited by 24 publications

(7 citation statements)

References 62 publications

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“…As a result, the probability of electron-hole recombination rate will be reduced. The produced superoxide radical anions and hydroxyl radicals are expected to be responsible to breakdown the dye molecules [31].…”

Section: Resultsmentioning

confidence: 99%

Effect of Fe Doping on Photocatalytic Dye-Degradation and Antibacterial Activity of SnO₂ Nanoparticles

Preethi¹,

Senthil

Pachamuthu³

et al. 2022

Adsorption Science & Technology

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A simple hydrothermal method is utilized to synthesize iron-doped tin oxide nanoparticles (Fe-SnO2 NPs) at various doping concentrations. The structural characterization using XRD, Raman, and FTIR measurements confirmed the incorporation of Fe ions into the SnO2 lattice without any deviation in the tetragonal crystal system of SnO2 nanoparticles. SEM and HRTEM images show the spherical-shaped nanoparticles with agglomeration. The values of interplanar spacing ( d -value) calculated from the HRTEM lattice are consistent with the XRD results. Further, optical analysis revealed a red shift in the optical absorption band and a decrease in the band gap energy with an increase in Fe-dopant concentration. The decrease of PL emission peak intensity with Fe doping revealed the generation of singly charged oxygen vacancies. The H2O2-assisted photocatalytic degradation efficiency of Fe-SnO2 NPs investigated against crystal violet dye indicated an efficiency of 98% for 0.05 M Fe-SnO2 NPs within 30 minutes under visible light illumination. In addition, the effects of pH, scavengers, and reusability of the catalyst are tested. The antibacterial behavior of Fe-SnO2 NPs against Escherichia coli is examined by using the colony count method, and the inhibition rate was found to be 49, 65, 70, and 78% for pure, 0.01, 0.03, and 0.05 M Fe-SnO2 NPs, respectively.

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Section: Resultsmentioning

confidence: 99%

Effect of Fe Doping on Photocatalytic Dye-Degradation and Antibacterial Activity of SnO₂ Nanoparticles

Preethi¹,

Senthil

Pachamuthu³

et al. 2022

Adsorption Science & Technology

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“…Several studies have concluded that adding H 2 O 2 to the reaction system significantly improves MB degradation due to the generation of OH radicals [7][8][9][10][11][12][13][14][15][16][17][19][20][21]. The photodegradation of MB with H 2 O 2 and UV irradiation is believed to work as per the following reaction schemes [50,51]. Initially, the H 2 O 2 under UV irradiation produces OH radicals (OH • ), which attack MB molecules and produce MB radicals (MB • ).…”

Section: Photodegradation Mechanismmentioning

confidence: 99%

Photodegradation of Methylene Blue Using a UV/H2O2 Irradiation System

Ali,

Maafa,

Qudsieh

2024

Water

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This study presents an efficient way to degrade methylene blue (MB) present in water via photodegradation using H2O2 as an oxidant in the presence of UV irradiation and without the use of a catalyst. The reaction variables, employed to evaluate the performance of the photodegradation process using the UV/H2O2 system, were the amount of H2O2 in the reacting solution and the initial concentration of methylene blue. The degradation of methylene blue in the presence of H2O2 was not observed during agitation in darkness. The degradation time decreased as the H2O2 concentration increased after the ideal concentration was reached. At this stage, as it began to scavenge the generated hydroxyl radicals, the rate of degradation became inversely proportional to the concentration of H2O2. An increase in the quantities of MB and H2O2 improved the degradation efficiency because the oxidation process was aided by using the appropriate amount of H2O2 and an ideal length of UV light exposure. The experimental data obtained were well-fitted to zero-order reaction kinetics based on the high values of the correlation coefficient. It is believed that the OH radicals (OH●) generated during the breakdown of H2O2 and the generated O2●− species attack the MB molecules and produce MB radicals (MB●). These MB radicals further experience oxidation and convert to intermediates and finally to CO2 and H2O. The UV/H2O2 system proved to be quite efficient for the photodegradation of methylene blue without the use of any solid catalyst. This UV/H2O2 system can be employed in the degradation of other organic pollutants in industrial wastewater.

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“…Here, one of the precursors present in the reaction is graphene oxide (GO) nanosheet, which was synthesised from purified natural graphite by the modified Hummers method [27]. The strategy for the synthesis of GO was described in our previous report [28] and reduced graphene oxide (RGO) was synthesised by usingA. scholaris bark extract as a reducing agent by the green method as illustrated in previously reported procedures [29].…”

Section: Synthesis Of Reduced Graphene Oxide (Rgo) and Au-rgo Nanocom...mentioning

confidence: 99%

Green synthesis of recyclable reduced graphene oxide-gold nanocatalyst using Alstonia scholaris: Applications in waste water purification and microbial field

Das,

Bairy,

Ghosh

et al. 2023

Adv. Nat. Sci: Nanosci. Nanotechnol.

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The green synthetic approaches are the alternative methods for the preparation of various types of nanoparticles to keep sustainable evolution. A novel green synthesis of gold- reduced graphene oxide nanocomposites was conducted through simple heating method using Alstonia scholaris (A. scholaris) bark extract. There are several techniques that confirm the formation of the nanocomposites for synthesis of gold nanoparticles on reduced graphene oxide (RGO), such as X-ray diffraction (XRD), UV–visible spectroscopy (UV–vis) and Fourier transformed infrared spectroscopy (FT-IR). The size distributions of the gold nanoparticles (Au NPs) grown on RGO surface was measured using two different methods: particle distribution study and transmission electron microscopy (TEM) image. These two methods provided similar size distribution which is around 5–8 nm. Subsequently, the catalytic performance was evaluated by 4-nitro aniline (4-NA). The photocatalytic activities were investigated using different organic hazardous dyes, such as methylene blue (MB), methyl orange (MO) and the change of photocatalytic behaviour was shown by varying the catalyst amount and pH. The chemical oxygen demand (COD) analyses for complete removal of organic dye were carried out using the two nanocomposite samples. To perceive the effect on different bacterial strains, antibacterial and antiprotozoal studies have been carried out with this nanocomposite.

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Hydrogen peroxide–assisted photocatalytic dye degradation over reduced graphene oxide integrated ZnCr2O4 nanoparticles

Cited by 24 publications

References 62 publications

Effect of Fe Doping on Photocatalytic Dye-Degradation and Antibacterial Activity of SnO₂ Nanoparticles

Effect of Fe Doping on Photocatalytic Dye-Degradation and Antibacterial Activity of SnO₂ Nanoparticles

Photodegradation of Methylene Blue Using a UV/H2O2 Irradiation System

Green synthesis of recyclable reduced graphene oxide-gold nanocatalyst using Alstonia scholaris: Applications in waste water purification and microbial field

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Hydrogen peroxide–assisted photocatalytic dye degradation over reduced graphene oxide integrated ZnCr2O4 nanoparticles

Cited by 24 publications

References 62 publications

Effect of Fe Doping on Photocatalytic Dye-Degradation and Antibacterial Activity of SnO2 Nanoparticles

Effect of Fe Doping on Photocatalytic Dye-Degradation and Antibacterial Activity of SnO2 Nanoparticles

Photodegradation of Methylene Blue Using a UV/H2O2 Irradiation System

Green synthesis of recyclable reduced graphene oxide-gold nanocatalyst using Alstonia scholaris: Applications in waste water purification and microbial field

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Effect of Fe Doping on Photocatalytic Dye-Degradation and Antibacterial Activity of SnO₂ Nanoparticles

Effect of Fe Doping on Photocatalytic Dye-Degradation and Antibacterial Activity of SnO₂ Nanoparticles