Synthesis and Characterization of rGO/Ag2O Nanocomposite and its Use for Catalytic Reduction of 4-Nitrophenol and Photocatalytic Activity

Iqbal, Mehreen; Zain‐ul‐Abdin,; Naseem, Taiba; Waseem, Muhammad; Din, Salah Ud; Hafeez, Muhammad; Haq, Sirajul; Qureshi, Sadia; Bibi, Asia; Rehman, Shams Ur; Hussain, Rafaqat

doi:10.1007/s10904-020-01680-w

Cited by 12 publications

(8 citation statements)

References 47 publications

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“…According to a report, every year, 72,000 children under-five die worldwide due to different diseases linked to unsafe water [ 3 ]. Various methodologies have been adopted for wastewater treatment, such as chemical filtration [ 4 , 5 ], water treatment [ 6 , 7 ], adsorption [ 8 , 9 , 10 ], and ion exchange [ 11 ]. Commercial metal oxide nanoparticles, Fe 2 O 3 , SiO 2 , NiO, and ZnO, were applied for water treatment [ 12 ].…”

Section: Introductionmentioning

confidence: 99%

Adsorption and Kinetics Studies of Cr (VI) by Graphene Oxide and Reduced Graphene Oxide-Zinc Oxide Nanocomposite

et al. 2022

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In this work, graphene oxide (GO) and its reduced graphene oxide-zinc oxide nanocomposite (rGO-ZnO) was used for the removal of Cr (VI) from aqueous medium. By employing a variety of characterization techniques, morphological and structural properties of the adsorbents were determined. The adsorption study was done by varying concentration, temperature, pH, time, and amount of adsorbent. The results obtained confirmed that rGO-ZnO is a more economical and promising adsorbent for removing Cr (VI) as compared to GO. Kinetic study was also performed, which suggested that sorption of Cr (VI) follows the pseudo-first-order model. For equilibrium study, non-linear Langmuir was found a better fitted model than its linearized form. The maximum adsorption capacity calculated for GO and rGO-ZnO nanocomposite were 19.49 mg/g and 25.45 mg/g, respectively. Endothermic and spontaneous nature of adsorption was detected with positive values of ΔS (change in entropy), which reflects the structural changes happening at the liquid/solid interface.

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Section: Introductionmentioning

confidence: 99%

Adsorption and Kinetics Studies of Cr (VI) by Graphene Oxide and Reduced Graphene Oxide-Zinc Oxide Nanocomposite

et al. 2022

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“…Iqbal et al ( 2021 ) used adsorption for the removal of 4-nitrophenol (4-NP) using a graphene oxide silver oxide (rGO/Ag 2 O) nanocomposite. The process involved the reduction of 4-NP into 4-aminophenol (4-AP), allowing nanocomposite to be efficiently reused for a minimum of five additional cycles without any noticeable loss.…”

Section: Cosmetic Treatment Technologiesmentioning

confidence: 99%

“…The SEM analysis revealed that the carbon sheet was randomly connected with Ag 2 O, while the average particle size was estimated to be approximately 25 nm. The nanocomposite exhibited efficient catalytic reduction of 4-nitrophenol to 4-aminophenol and an outstanding photocatalytic activity for the degradation of methyl blue and brilliant green (Iqbal et al 2021 ).…”

Section: Cosmetic Treatment Technologiesmentioning

confidence: 99%

Cosmetic wastewater treatment technologies: a review

Gkika

Mitropoulos

Lambropoulou

et al. 2022

Environ Sci Pollut Res

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Over the past three decades, environmental concerns about the water pollution have been raised on societal and industrial levels. The presence of pollutants stemming from cosmetic products has been documented in wastewater streams outflowing from industrial as well as wastewater treatment plants. To this end, a series of consistent measures should be taken to prevent emerging contaminants of water resources. This need has driven the development of technologies, in an attempt to mitigate their impact on the environment. This work offers a thorough review of existing knowledge on cosmetic wastewater treatment approaches, including, coagulation, dissolved air flotation, adsorption, activated sludge, biodegradation, constructed wetlands, and advanced oxidation processes. Various studies have already documented the appearance of cosmetics in samples retrieved from wastewater treatment plants (WWTPs), which have definitely promoted our comprehension of the path of cosmetics within the treatment cycle; however, there are still multiple blanks to our knowledge. All treatments have, without exception, their own limitations, not only cost-wise, but also in terms of being feasible, effective, practical, reliable, and environmentally friendly. Graphical abstract

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“…There were also closely associated cavities present. It was observed that wrinkles were present across GO layer because of its crumpling nature (Iqbal et al 2020). In the SEM image of the ternary nanocomposite, the sheets of the reduced graphene oxide can be seen twisted and folded with a rough structure.…”

Section: Uv-visible Spectroscopymentioning

confidence: 99%

Synthesis and characterization of Ag2O, CoFe2O4, GO, and their ternary composite for antibacterial activity

Aftab

Naseem

Hussain

et al. 2022

Environ Sci Pollut Res

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Currently, nanomaterials with exceptional antibacterial activity have become an emerging domain in research. The optimization of nanomaterials against infection causing agents is the next step in dealing with the present-day problem of antibiotics. In this research work, Ag 2 O, CoFe 2 O 4 , and Ag 2 O/CoFe 2 O 4 /rGO are prepared by chemical methods. The structural and morphological properties were studied by UV-Vis spectroscopy, X-ray diffraction spectroscopy (XRD), scanning electron microscopy (SEM), energy dispersive X-ray spectroscopy (EDX), and Fourier-transform infrared (FTIR) spectroscopy. The synthesized Ag 2 O, CoFe 2 O 4 , and Ag 2 O/CoFe 2 O 4 /rGO nanomaterials were used for antibacterial activities. The nanomaterials were investigated for antibacterial properties, and results showed that all these materials exhibit superior antibacterial e cacy against gram-positive strains like Staphylococcus aureus (S. aureus) and gram-negative bacterial strains like Escherichia coli (E. coli). According to the antibacterial results, the nanocomposite signi cantly reduced the reproduction rate of E. coli and S. aureus. Moreover, the antibacterial activity of nanomaterials showed a gradual increment with an increase in the concentration of the materials. These results demonstrate that all the nanomaterials, as a kind of antibacterial material, have a great potential for application in a wide range of biomedical applications.

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Synthesis and Characterization of rGO/Ag2O Nanocomposite and its Use for Catalytic Reduction of 4-Nitrophenol and Photocatalytic Activity

Cited by 12 publications

References 47 publications

Adsorption and Kinetics Studies of Cr (VI) by Graphene Oxide and Reduced Graphene Oxide-Zinc Oxide Nanocomposite

Adsorption and Kinetics Studies of Cr (VI) by Graphene Oxide and Reduced Graphene Oxide-Zinc Oxide Nanocomposite

Cosmetic wastewater treatment technologies: a review

Synthesis and characterization of Ag2O, CoFe2O4, GO, and their ternary composite for antibacterial activity

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