Physicochemical parameter influences and their optimization on the biosynthesis of MnO2 nanoparticles using Vernonia amygdalina leaf extract

Dessie, Yilkal; Tadesse, Sisay; Eswaramoorthy, Rajalakshmanan

doi:10.1016/j.arabjc.2020.06.006

Cited by 33 publications

(16 citation statements)

References 61 publications

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“…In Figure 1b, the absorption spectra displayed a significant absorption peak at 550 nm related to potassium permanganate precursor, while another peak can be observed at 280 nm, which is corresponding to M. domestica extract, and the appeared peak at 350 nm was assigned to be corresponding to MnO 2 NPs. The obtained results matched those in the literature [55]. particles (0.1 g/100 mL) in the ranges of 0.1-1.4 mL and 0.5-3.0 mL of NiONPs a MnO2NPs, respectively.…”

Section: Characterization Of Nionps and Mno 2 Npssupporting

confidence: 89%

“…The red shift of absorption spectrum to 320 and 350 nm for NiONPs and MnO 2 NPs, respectively and the decrease of band gap values revealed the formation of nanoscale materials. According to the literature [ 54 , 55 ], these distinct peaks represent the formation of NiONPs and MnO 2 NPs with particle sizes of approximately 50–100 nm, respectively. Additionally, in nanoscale materials, the relation between the band gap and the size diameter of particle is inversely proportional to each other.…”

Section: Resultsmentioning

confidence: 99%

“…The red shift of absorption spectrum to 320 and 350 nm for NiONPs a MnO2NPs, respectively and the decrease of band gap values revealed the formation nanoscale materials. According to the literature [54,55], these distinct peaks represent formation of NiONPs and MnO2NPs with particle sizes of approximately 50-100 n The band gap energy of the as-prepared NiONPs and MnO 2 NPs was calculated from the formula E g = hν where, E g is the band gap energy, h is a blank constant, and ν is the frequency. The band gaps of NiONPs and MnO 2 NPs were calculated as 3.56 and 3.62 eV, respectively.…”

Section: Characterization Of Nionps and Mno2npsmentioning

confidence: 99%

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Exploiting of Green Synthesized Metal Oxide Nanoparticles for Spectrophotometric Determination of Levofloxacin, Cephalexin, and Cefotaxime Sodium in Commercial Products

et al. 2021

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In this study, two metal oxide nanoparticles NiO and MnO2 were synthesized from green sources Mentha spicata (M. spicata) extract and Malus domestica (M. domestica) peel extract, respectively. The optical and physical properties of the synthesized nanoparticles were characterized using spectroscopic and microscopic techniques. Simple, precise, and new spectrophotometric probes were suggested for the determination of three cephalosporin antibiotics, including levofloxacin (LVX), cephalexin (CPX), and cefotaxime sodium (CTX) in their pure form and commercial products. The spectrophotometric detection of the selected drugs is based on the catalytic enhancement of NiO and MnO2 nanoparticles (NPs) due to their unique optical properties. Linear relationships with main correlation coefficients 0.999 were obtained at 0.1–20, 1.0–80, and 0.001–100 µg mL−1 for the three drugs in the presence of NiONPs, whereas 0.01–60, 0.1–160, and 0.01–80 µg mL−1 were obtained in the presence of MnO2NPs at absorption wavelengths 290, 262, and 235 nm for LVX, CPX and CTX, respectively. The analytical methods were validated and successfully used for determination of the instigated drugs in their bulk and commercial dosage forms.

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Section: Characterization Of Nionps and Mno 2 Npssupporting

confidence: 89%

Section: Resultsmentioning

confidence: 99%

Section: Characterization Of Nionps and Mno2npsmentioning

confidence: 99%

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Exploiting of Green Synthesized Metal Oxide Nanoparticles for Spectrophotometric Determination of Levofloxacin, Cephalexin, and Cefotaxime Sodium in Commercial Products

et al. 2021

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“…The 4-hour hot air oven-dried precipitate was calcined at 450°C for 2 hours to give α-MnO 2 /NiO bimetallic NPs. For the biosynthesized α-MnO 2 NP preparation, refer to our previous work [22]. PANI was polymerized chemically based on the literature [23] as follows.…”

Section: Methodsmentioning

confidence: 99%

“…The mixture was waited for 30 minutes, followed by stirring. Then, 0.5 g of optimized biosynthesized α-MnO 2 NPs [22] was dispersed in 25 mL distilled water, and the mixture was exposed for 5 minutes of ultrasonication to disperse the biosynthesized material. Finally, the dispersed α-MnO 2 NPs were added dropwise to aniline hydrochloride solution with 2.86 g of 50 mL APS (oxidant and codopant) at room temperature and stirred for 4 hours to complete the polymerization.…”

Section: Methodsmentioning

confidence: 99%

Surface Roughness and Electrochemical Performance Properties of Biosynthesized α-MnO2/NiO-Based Polyaniline Ternary Composites as Efficient Catalysts in Microbial Fuel Cells

Dessie

Tadesse

Eswaramoorthy

2021

Journal of Nanomaterials

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In this study, biosynthesized α-MnO2/NiO NPs and chemically oxidative polyaniline (PANI) were synthesized to form ternary composite anode material for MFC. The synthesized materials were characterized with different materials (UV-Vis, FTIR, XRD, TGA-DTA-DSC, SEM-EDX-Gwyddion, CV, and EIS) to deeply examine their optical, structural, morphological, thermal, roughness, and electrocatalytic properties. The degree of surface roughness for α-MnO2/NiO/PANI was 23.65 ± 5.652 nm . This value was higher than the pure α-MnO2, pure PANI, and even α-MnO2/PANI nanocomposite due to surface modification. The total charge storing performance for bare PGE, α-MnO2/PGE, PANI/PGE, α-MnO2/PANI/PGE, and α-MnO2/NiO/PANI/PGE were 5.291, 17.267, 20.659, 23.258, and 24.456 mC. From this, the charge storing performance formed by α-MnO2/NiO/PANI-modified PGE was highest, indicating that this electrode is best in cycle stability and increases its life cycle during energy conversion time in MFC. This is also supported by its effective surface area, having a value of 0.00984 cm2. From this, it is evidenced that the ternary composite catalyst-modified anode facilitates the fast electrocatalytic activity as observed from its high peak current and lower peak-to-peak potential separation ( Δ E p = 0.216 V ) than other electrodes. Such surface modification helps to store more electrical charge by increasing electrical conductivity during its charge/discharge processing time. In addition, the lower charge transfer resistance property with a value of 788.9 Ω and the fast heterogeneous electron transfer rate of ~2.92 s-1 enable to facilitate glucose oxidation, and this enhances to produce high power output and increase wastewater treatment efficiency. As a result, the bioelectrical activity of α-MnO2/NiO/PANI composite-modified PGE was very effective in producing a maximum power density of 506.96 mW m-2 with COD of 81.92%. The above observations justified that α-MnO2/NiO/PANI/PGE serves as an effective anode material in double-chambered MFC application.

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Manganese Oxide Nanoparticles: An Insight into Structure, Synthesis and Applications

2023

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Manganese oxide nanoparticles with different crystal phases, morphologies, and structural diversity along with their exceptional properties like high specific surface area, a high fraction of surface atoms, non‐toxic nature, and excellent redox properties are drawing attention for various applications in storage science, especially in the batteries, super‐capacitors, energy conversion, and the environmental catalysis field. Precise control of particle size, morphology, surface area, Mnx+ oxidation state, etc. is the utmost important aspect to explore their application to the full potential. Here, the emphasis is on the recent trends in manganese oxide research – structure, synthesis, and applications. The structure of numerous crystalline phases of manganese oxide nanoparticles are summerized and several facile chemical synthesis processes to achieve the desired crystalline/amorphous structure are discoursed. Temperature and different synthesis conditions dependent phase transformations of β‐MnO2, α‐Mn2O3, and Mn3O4 from α‐MnO2 are discussed as well. The pragmatic approach directs that the application field is mostly controlled by the morphologies.

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Physicochemical parameter influences and their optimization on the biosynthesis of MnO2 nanoparticles using Vernonia amygdalina leaf extract

Cited by 33 publications

References 61 publications

Exploiting of Green Synthesized Metal Oxide Nanoparticles for Spectrophotometric Determination of Levofloxacin, Cephalexin, and Cefotaxime Sodium in Commercial Products

Exploiting of Green Synthesized Metal Oxide Nanoparticles for Spectrophotometric Determination of Levofloxacin, Cephalexin, and Cefotaxime Sodium in Commercial Products

Surface Roughness and Electrochemical Performance Properties of Biosynthesized α-MnO2/NiO-Based Polyaniline Ternary Composites as Efficient Catalysts in Microbial Fuel Cells

Manganese Oxide Nanoparticles: An Insight into Structure, Synthesis and Applications

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