Water hyacinth plant extract mediated green synthesis of Cr2O3/ZnO composite photocatalyst for the degradation of organic dye

Zelekew, Osman Ahmed; Fufa, Paulos Asefa; Sabir, Fedlu Kedir; Duma, Alemayehu Dubale

doi:10.1016/j.heliyon.2021.e07652

Cited by 36 publications

(11 citation statements)

References 57 publications

(67 reference statements)

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“…Currently, reports on a ZnO-based photocatalyst are available [15][16][17][18]. For example, the prepared ZnO from Acremonium potronii for dye degradation was reported by Ameen et al [19].…”

Section: Introductionmentioning

confidence: 99%

Chromium Ion Accumulations from Aqueous Solution by the Eichorinia crassipes Plant and Reusing in the Synthesis of Cr‐Doped ZnO Photocatalyst

Zelekew

Fufa

Sabir

et al. 2022

Journal of Nanomaterials

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The Cr-doped ZnO photocatalysts were synthesized through the chromium ion accumulations by water hyacinth (Eichhornia crassipes). In the preparation process, the plant tissues were immersed in different sample flasks containing chromium precursors for 1, 2, 4, 6, and 8 days. The plant tissue containing chromium ion was mixed with zinc precursor followed by calcinations. For simplicity, the prepared Cr-doped ZnO samples with the plant immersed for 1, 2, 4, 6, and 8 days were abbreviated as D1, D2, D4, D6, and D8, respectively. Moreover, pure ZnO was also prepared without the water hyacinth plant accumulated with chromium ion for comparison purposes. The powder sample characterizations were performed and evaluated in the degradation of methylene blue (MB). The Cr-doped ZnO sample (D1) degrades 80% of MB dye while the D2, D4, D6, D8, and pure ZnO samples degrade only 74, 76, 79, 73, and 25%, respectively. On the other hand, without the addition of catalysts (blank), there was no significant degradation of MB dye within 90 min irradiation. Therefore, the degradation performance of Cr-doped ZnO in the presence of optimum amount of chromium dopant and water hyacinth is highly improved than that of pure ZnO. The catalytic improvement may be as a result of reducing the photogenerated electron and hole recombination rates due to the presence of dopants. Moreover, the presence of the Eichhornia crassipes plant in the synthesis of Cr-doped ZnO could also prevent further aggregations and particle size growth and enhance the porosity after calcination.

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Section: Introductionmentioning

confidence: 99%

Chromium Ion Accumulations from Aqueous Solution by the Eichorinia crassipes Plant and Reusing in the Synthesis of Cr‐Doped ZnO Photocatalyst

Zelekew

Fufa

Sabir

et al. 2022

Journal of Nanomaterials

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“…Due to their excellent stability, hardness, high resistivity, high melting temperature, and wide bandgap of 3.4 eV, chromium oxide nanoparticles (Cr 2 O 3 ) have grained particular among metal oxide NPs (Iqbal et al, 2020;Isacfranklin et al, 2020). Cr 2 O 3 NPs could be used in materials for catalysis (Mori et al, 2017), photocatalysis (Zelekew et al, 2021), super capacitors (Shafi et al, 2021), lithium ion batteries (Cao and Zuo, 2017), sensing (Gao et al, 2019), and other biological activities due to their unique properties (Talat et al, 2021). Biocompatibility of Cr 2 O 3 nanoparticles is an essential parameter for their use in many biological systems (Khan et al, 2021).…”

Section: Introductionmentioning

confidence: 99%

A study on green synthesis, characterization of chromium oxide nanoparticles and their enzyme inhibitory potential

et al. 2022

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The conventional chemical methods of nanoparticles synthesis have been effectively replaced by nanoparticle synthesis mediated by plants. The current study describes the environmental friendly synthesis of chromium oxide nanoparticles (Cr2O3 NPs) using Erythrophleum guineense plant extract. The synthesis of Cr2O3 NPs was validated by UV/VIS spectroscopy, Energy Dispersive X-Ray (EDX), Scanning Electron Microscopy (SEM), and X-ray diffraction (XRD) studies. The appearance of the Sharpe peak at 460 nm in the UV/Vis spectrum and the colour change caused by surface plasma resonance confirmed the formation of Cr2O3 NPs. The EDX spectrum of Cr2O3 nanoparticles revealed the presence of carbon, oxygen, and chromium, while SEM analysis revealed an irregular round morphology (with a size below 400 nm). In addition, XRD studies suggested their crystalline nature by the characteristic peaks at 34° and 36° and 42° (2Ɵ), respectively. The green synthesized Cr2O3 NPs showed promise as in-vitro cholinesterase inhibitor at tested concentrations (62.5–1,000 μg/ml), with IC50 values of 120 and 100 μg/ml against Acetylcholinesterase (AChE) and Butyrylcholinesterase (BChE), respectively. The results suggested that the green synthesized Cr2O3 NPs could be used in the future to stop enzyme from working and for other biological activities.

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“…Besides these, the amorphous phase of silica is highlighted at 25 2θ [ 34 ]. After introducing and increasing the concentration of zinc oxide, it is observed that major changes occur only at the concentration of 0.1g ZnO in the material [ 35 ].…”

Section: Resultsmentioning

confidence: 99%

Antimicrobial Perspectives of Active SiO2FexOy/ZnO Composites

et al. 2022

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The antibacterial activity of zinc oxide particles has received significant interest worldwide, especially through the implementation of technology to synthesize particles in the nanometer range. This study aimed to determine the antimicrobial efficacy of silica-based iron oxide matrix (SiO2FexOy) synthesized with various amounts of ZnO (SiO2FexOyZnO) against various pathogens. It is observed that, with the addition of ZnO to the system, the average size of the porosity of the material increases, showing increasingly effective antibacterial properties. Zinc-iron-silica oxide matrix composites were synthesized using the sol–gel method. The synthesized materials were investigated physicochemically to highlight their structural properties, through scanning electron microscopy (SEM), Energy Dispersive X-ray Spectroscopy (EDX), and Fourier-transform infrared spectroscopy (FT-IR). At the same time, surface area, pore size and total pore volume were determined for materials synthesized using the Brunauer–Emmett–Teller (BET) method. Although the material with 0.0001 g ZnO (600 m2/g) has the highest specific surface area, the best antimicrobial activity was obtained for the material with 1.0 g ZnO, when the average pore volume is the largest (~8 nm) for a specific surface of 306 m2/g. This indicates that the main role in the antibacterial effect has reactive oxygen species (ROS) generated by the ZnO that are located in the pores of the composite materials. The point of zero charge (pHpZc) is a very important parameter for the characterization of materials that indicate the acid-base behaviour. The pHpZc value varies between 4.9 and 6.3 and is influenced by the amount of ZnO with which the iron-silica oxide matrix is doped. From the antimicrobial studies carried out, it was found that for S. aureus the total antibacterial effect was obtained at the amount of 1.0 g ZnO. For Gram-negative bacteria, a total antibacterial effect was observed in S. flexneri (for the material with 0.1 g ZnO), followed by E. coli (for 1.0 g ZnO). For P. aeruginosa, the maximum inhibition rate obtained for the material with 1.0 g ZnO was approximately 49%.

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Water hyacinth plant extract mediated green synthesis of Cr2O3/ZnO composite photocatalyst for the degradation of organic dye

Cited by 36 publications

References 57 publications

Chromium Ion Accumulations from Aqueous Solution by the Eichorinia crassipes Plant and Reusing in the Synthesis of Cr‐Doped ZnO Photocatalyst

Chromium Ion Accumulations from Aqueous Solution by the Eichorinia crassipes Plant and Reusing in the Synthesis of Cr‐Doped ZnO Photocatalyst

A study on green synthesis, characterization of chromium oxide nanoparticles and their enzyme inhibitory potential

Antimicrobial Perspectives of Active SiO2FexOy/ZnO Composites

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