Green synthesis and characterization of RGO/Cu nanocomposites as photocatalytic degradation of organic pollutants in waste-water

Safajou, Hamed; Ghanbari, Mojgan; Amiri, Omid; Khojasteh, Hossein; Namvar, Farzad; Zinatloo-Ajabshir, Sahar; Salavati‐Niasari, Masoud

doi:10.1016/j.ijhydene.2021.03.175

Cited by 72 publications

(13 citation statements)

References 64 publications

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“…14 Water contamination is currently one of the most important environmental issues, owing to the presence of organic color molecules. 15,16 Among the various nitroaromatic chemicals, nitrophenols are the most common contaminant of industrial effluents. Aqueous nitrophenol effluents are common industrial wastes produced during various organic products, including pharmaceuticals, insecticides, herbicides, plasticizers, dyes, and explosives.…”

Section: Introductionmentioning

confidence: 99%

Synthesis of Biogenic Silver Nanocatalyst and their Antibacterial and Organic Pollutants Reduction Ability

et al. 2022

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Plant-mediated nanoparticles are gaining popularity due to biologically active secondary metabolites that aid in green synthesis. This study describes a simple, environmentally friendly, dependable, and cost-effective production of silver nanoparticles utilizing Cucumis sativus and Aloe vera aqueous leaf extracts. The aqueous leaf extracts of Cucumis sativus and Aloe vera , which worked as a reducing and capping agent, were used to biosynthesize silver nanoparticles (AgNPs). The formation of surface plasmon resonance peaks at 403 and 405 nm corresponds to the formation of colloidal Ag nanoparticles. Similarly, the Bragg reflection peaks in X-ray diffraction patterns observed at 2θ values of 38.01°, 43.98°, 64.24°, and 77.12° representing the planes of [111], [200], [220], and [311] correspond to the face-centered cubic crystal structure of silver nanoparticles. Fourier transform infrared spectroscopy confirms that bioactive chemicals are responsible for the capping of biogenic silver nanoparticles. The size, structure, and morphology of AgNPs with diameters ranging from 8 to 15 nm were examined using transmission electron microscopy. Water contamination by azo dyes and nitrophenols is becoming a more significant threat every day. The catalytic breakdown of organic azo dye methyl orange (MO) and the conversion of para -nitrophenol (PNP) into para -aminophenol using sodium borohydride was evaluated using the prepared biogenic nanoparticles. Our nanoparticles showed excellent reduction ability against PNP and MO with rate constants of 1.51 × 10 –3 and 6.03 × 10 –4 s –1 , respectively. The antibacterial activity of the nanomaterials was also tested against four bacteria: Staphylococcus aureus , Klebsiella pneumoniae , Enterobacter , and Streptococcus pneumoniae . These biogenic AgNPs displayed effective catalytic and antibacterial characteristics by reducing MO and PNP and decreasing bacterial growth.

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Section: Introductionmentioning

confidence: 99%

Synthesis of Biogenic Silver Nanocatalyst and their Antibacterial and Organic Pollutants Reduction Ability

et al. 2022

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“…Figure e represents the Tauc plot of the CuO/ZnO/NiO nanocomposite. To determine the bandgap energy of the nanocomposite, a graph is plotted between (α hv ) 2 and hv . − The energy band gap of the synthesized nanocomposite was 3.8 eV. − …”

Section: Resultsmentioning

confidence: 99%

“…IC 50 is the medication concentration required for half (50%) inhibition in vitro. 65 The IC 50 value of the synthesized nanocomposite (IC 50 = 0.11) against DPPH and ABTS (0.512) was smaller than that of ascorbic acid (IC 50 = 1.047). The low IC 50 value suggested that the antioxidant potential of the synthesized nanocomposites was higher than that of ascorbic acid (IC 50 = 1.04), which means that the synthesized nanocomposite exhibits excellent antioxidant activity against both DPPH and ABTS but higher in the case of DPPH than ABTS.…”

Section: Scanning Electron Microscopy (Sem) Figure 2cmentioning

confidence: 99%

Ternary Metal (Cu–Ni–Zn) Oxide Nanocomposite via an Environmentally Friendly Route

et al. 2023

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In this work, we report the engineering of sub-30 nm nanocomposites of CuO/ZnO/NiO by using Dodonaea viscosa leaf extract. Zinc sulfate, nickel chloride, and copper sulfate were used as salt precursors, and isopropyl alcohol and water were used as solvents. The growth of nanocomposites was investigated by varying the concentrations of precursors and surfactants at pH 12. The as-prepared composites were characterized by XRD analysis and found to have CuO (monoclinic), ZnO (hexagonal primitive), and NiO (cubic) phases with an average size of 29 nm. FTIR analysis was performed to investigate the mode of fundamental bonding vibrations of the as-prepared nanocomposites. The vibrations of the prepared CuO/ZnO/NiO nanocomposite were detected at 760 and 628 cm–1, respectively. The optical bandgap energy of the CuO/NiO/ZnO nanocomposite was 3.08 eV. Ultraviolet–visible spectroscopy was performed to calculate the band gap by the Tauc approach. Antimicrobial and antioxidant activities of the synthesized CuO/NiO/ZnO nanocomposite were investigated. It was found that the antimicrobial activity of the synthesized nanocomposite increases with an increase in the concentration. The antioxidant activity of the synthesized nanocomposite was examined by using both ABTS and DPPH assays. The obtained results show an IC50 value of 0.110 for the synthesized nanocomposite compared to DPPH and ABTS (0.512), which is smaller than that of ascorbic acid (IC50 = 1.047). Such a low IC50 value ensures that the antioxidant potential of the nanocomposite is higher than that of ascorbic acid, which in turn shows their excellent antioxidant activity against both DPPH and ABTS.

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“…In addition, we can also say that the Larrea Tridentata extract acts as the best GO reducer, according to the results obtained from the FT-IR, UV–Vis and XRD characterization techniques. On the other hand, it was possible to verify that the RGO reduced with natural extracts can act as a photocatalyst for the degradation of MB dye [ 68 , 69 , 70 , 71 ].…”

Section: Discussionmentioning

confidence: 99%

Eco-Friendly Reduction of Graphene Oxide by Aqueous Extracts for Photocatalysis Applications

et al. 2022

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In the present work, reduced graphene oxide was obtained by green synthesis, using extracts of Larrea tridentata (gobernadora) and Capsicum Chinense (habanero). Graphene oxide was synthesized by the modified Hummers’ method and subsequently reduced using natural extracts to obtain a stable and environmentally friendly graphene precursor. Consequently, the gobernadora aqueous extract was found to have a better reducing power than the habanero aqueous extract. This opportunity for green synthesis allows the application of RGO in photocatalysis for the degradation of the methylene blue dye. Degradation efficiencies of 60% and 90% were obtained with these materials.

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Green synthesis and characterization of RGO/Cu nanocomposites as photocatalytic degradation of organic pollutants in waste-water

Cited by 72 publications

References 64 publications

Synthesis of Biogenic Silver Nanocatalyst and their Antibacterial and Organic Pollutants Reduction Ability

Synthesis of Biogenic Silver Nanocatalyst and their Antibacterial and Organic Pollutants Reduction Ability

Ternary Metal (Cu–Ni–Zn) Oxide Nanocomposite via an Environmentally Friendly Route

Eco-Friendly Reduction of Graphene Oxide by Aqueous Extracts for Photocatalysis Applications

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