Bimetallic Mn–Ni oxide nanoparticles: Green synthesis, optimization and its low-cost anode modifier catalyst in microbial fuel cell

Dessie, Yilkal; Tadesse, Sisay; Eswaramoorthy, Rajalakshmanan; Abdisa, Eticha

doi:10.1016/j.nanoso.2020.100663

Cited by 22 publications

(10 citation statements)

References 47 publications

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“…In this study, the myco-synthesized MnO NPs were first detected by the naked eye when the reaction color changed from yellow to yellowish-brown and reddish-brown suspension, as presented in Fig. 2 B,C; due to the excitation of the surface plasma vibrations 26 . Additionally, UV–Vis absorption intensity peaks get increased with maximum absorbance at 350 nm, which confirms the mycosynthesis of MnO NPs as shown in Fig.…”

Section: Resultsmentioning

confidence: 76%

Novel biosynthesis of MnO NPs using Mycoendophyte: industrial bioprocessing strategies and scaling-up production with its evaluation as anti-phytopathogenic agents

EL-Moslamy

Yahia

Zahran

et al. 2023

Sci Rep

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This report provides the first description of the myco-synthesis of rod-shaped MnO NPs with an average crystallite size of ~ 35 nm, employing extracellular bioactive metabolites of endophytic Trichodermavirens strain EG92 as capping/reducing agents and MnCl2·4H2O as a parent component. The wheat bran medium was chosen to grow endophytic strain EG92, which produced a variety of bioactive metabolites in extracellular fraction, which increases the yield of MnO NPs to 9.53 g/l. The whole medium and fungal growth conditions that influenced biomass generation were optimized as successive statistical optimization approaches (Plackett–Burman and Box–Behnken designs). The production improvements were achieved at pH 5.5, WBE (35%), and inoculum size (10%), which increased Xmax to twelve-folds (89.63 g/l); thereby, Pmax increased to eight-folds (82.93 g/l). After 162 h, Xmax (145.63 g/l) and Pmax (99.52 g/l) on the side of µmax and YX/S were determined as 0.084 and 7.65, respectively. ViaTaguchi experimental design, fungus-fabricated MnO NPs reaction was improved by adding 0.25 M of MnCl2·4H2O to 100% of fungal extract (reducing/capping agents) and adjusting the reaction pH adjusted to ~ 5. This reaction was incubated at 60 °C for 5 h before adding 20% fungal extract (stabilizing agent). Also, Pmax was raised 40-fold (395.36 g/l) over the BC. Our myco-synthesized MnO NPs exhibit faster and more precise antagonistic actions against phytopathogenic bacteria than fungi; they could be employed as an alternative and promised nano-bio-pesticide to manage a variety of different types of disease-pathogens in the future.

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Section: Resultsmentioning

confidence: 76%

Novel biosynthesis of MnO NPs using Mycoendophyte: industrial bioprocessing strategies and scaling-up production with its evaluation as anti-phytopathogenic agents

EL-Moslamy

Yahia

Zahran

et al. 2023

Sci Rep

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“…This property clearly increases the biocompatibility, electrical conductivity, and life cycle of the anode in MFC by improving its performance towards a maximum power density of 506.96 mW m -2 with a COD removal of 81.92%. The power density produced by the α-MnO 2 /NiO/PANI ternary composite-modified anode is better in efficiency than power output which was done by biosynthesized α-MnO 2 /NiO bimetallic NPs with a mean value of 412.24 mW m -2 [21]. The CE produced by the α-MnO 2 /-NiO/PANI/PGE ternary composite was 10.30% which was almost 5-fold better than bare PGE with a value of 2.29%.…”

Section: Discussionmentioning

confidence: 99%

“…Synthesis. An optimized α-MnO 2 /NiO binary composite was prepared based on our previous method [21]. In detail, an aqueous nickel ion concentration of 51% (v/v) to KMnO 4 was added in a round-bottom flask which was placed on a controlled hot plate at a fixed temperature of 80°C and fixed pH~8 with continuous stirring.…”

Section: Methodsmentioning

confidence: 99%

“…Hydrothermal, solvothermal, electrodeposition, electropolymerization, microwave-assisted, and pyrolysis methods were time-consuming and used expensive advanced instruments. Previously, we prepared Mn-Ni oxide bimetallic NPs by following the simple green method by using Vernonia amygdalina leaf extract as a reducing and stabilizing agent [21]. To be an effective nanocatalyst towards bioelectricity and its simultaneous waste remediation, the catalyst should be best in roughness degree and be efficient in electrocatalytic activities that enable to increase anode electrode performance for effective organic wastewater oxidation (i.e., facilitating substrate oxidation).…”

Section: Introductionmentioning

confidence: 99%

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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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“…In light of the gaps reported above, in this study, we examine the EO of ammoniacal nitrogen in simulated saline NH 4 Cl wastewater using bored-doped diamond (BDD) electrodes. BDD electrodes, belonging to the class of nonactive electrodes, in contrast to transition-metal oxide (TMO) active anodes [ 47 , 48 ], are widely recognized as a very stable anodic material with a higher production of • OH and, thus, with a high overpotential of O 2 , implying high efficiency for the removal of ammonium from impacted water [ 45 , 49 , 50 ].…”

Section: Introductionmentioning

confidence: 99%

Electrochemical Removal of Nitrogen Compounds from a Simulated Saline Wastewater

et al. 2023

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In the last few years, many industrial sectors have generated and discharged large volumes of saline wastewater into the environment. In the present work, the electrochemical removal of nitrogen compounds from synthetic saline wastewater was investigated through a lab-scale experimental reactor. Experiments were carried out to examine the impacts of the operational parameters, such as electrolyte composition and concentration, applied current intensity, and initial ammoniacal nitrogen concentration, on the total nitrogen removal efficiency. Using NaCl as an electrolyte, the NTOT removal was higher than Na2SO4 and NaClO4; however, increasing the initial NaCl concentration over 250 mg·L−1 resulted in no benefits for the NTOT removal efficiency. A rise in the current intensity from 0.05 A to 0.15 A resulted in an improvement in NTOT removal. Nevertheless, a further increase to 0.25 A led to basically no enhancement of the efficiency. A lower initial ammoniacal nitrogen concentration resulted in higher removal efficiency. The highest NTOT removal (about 75%) was achieved after 90 min of treatment operating with a NaCl concentration of 250 mg·L−1 at an applied current intensity of 0.15 A and with an initial ammoniacal nitrogen concentration of 13 mg·L−1. The nitrogen degradation mechanism proposed assumes a series–parallel reaction system, with a first step in which NH4+ is in equilibrium with NH3. Moreover, the nitrogen molar balance showed that the main product of nitrogen oxidation was N2, but NO3− was also detected. Collectively, electrochemical treatment is a promising approach for the removal of nitrogen compounds from impacted saline wastewater.

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Bimetallic Mn–Ni oxide nanoparticles: Green synthesis, optimization and its low-cost anode modifier catalyst in microbial fuel cell

Cited by 22 publications

References 47 publications

Novel biosynthesis of MnO NPs using Mycoendophyte: industrial bioprocessing strategies and scaling-up production with its evaluation as anti-phytopathogenic agents

Novel biosynthesis of MnO NPs using Mycoendophyte: industrial bioprocessing strategies and scaling-up production with its evaluation as anti-phytopathogenic agents

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

Electrochemical Removal of Nitrogen Compounds from a Simulated Saline Wastewater

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