Synthesis and Characterization of Green CuO using Centella Asiatica Plant Leaf Extract: Electrochemical and Photocatalytic Activities

Rudresha, K.; Hussain, Athar; Ravikumar, C.R.; Mohanraj, K.; Nagaswarupa, H.P.; Santosh, M.S.; Murthy, H.C. Ananda

doi:10.5185/amlett.2020.121586

Cited by 11 publications

(5 citation statements)

References 15 publications

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“…Because ZnO was present on the surface of CuO, a new energy level below the material‘s conduction band was created, making it simple to excite electrons. [72,73] …”

Section: Resultsmentioning

confidence: 99%

“…This rise in rate suggests that CuO and ZnO work effectively together. Because ZnO was present on the surface of CuO, a new energy level below the material's conduction band was created, making it simple to excite electrons.. [72,73] Over UV light irradiation, the ZnO captures the photo excited electrons and extend the lifespan of the photo induced h + . These effectively restrict the combining of e À /h + pair and consequently increase the dye degradation rate.…”

Section: Photocatalytic Degradation Of Direct Green (Dg) and Fast Blu...mentioning

confidence: 99%

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Bimetallic CuO−ZnO Hybrid Nanocomposite Materials for Efficient Remediation of Environmental Pollutants

Rudresha

Hussain

Ravikumar³

et al. 2023

ChemistrySelect

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Pure CuO and 2‐Dimentional CuO−ZnO nanocomposites (NCs) were effectively prepared by an ultrasound‐assisted probe sonication route for different ratios of CuO and ZnO, and the multifunctional properties were investigated by the application of the advanced methods. XRD (X‐ray diffraction) patterns revealed a crystallite size (D) range of 25 to 31 nm for pure CuO and CuO−ZnO NCs. According to calculations, the energy band gap value (Eg) for the NCs is between 2.15 and 2.48 eV. Under UV light irradiation, the photocatalytic degradation of pure CuO and CuO−ZnO NCs on Direct Green (DG) and Fast Blue (FB) dyes was assessed. 60 mg of the catalyst was added to 20 ppm solutions of DG and FB dye. The stock solution of the dyes was prepared 10, 15, 20 and 25 ppm of 250 ml dye solution. Electrochemical analysis using cyclic voltammetry revealed improved redox potential output in the electrode crafted with graphite powder in 0.1 N HCl electrolyte solution. These NCs were used because of their capacity to detect an extremely dangerous chemical like arsenic. The constructed electrode‘s lowest limit of detection was determined to be 110–3 mol/L. In general, vertical linearity was seen in all of the prepared nano‐electrodes, especially above 150 ohms with real axis for pure CuO but beyond 100 ohms for doped electrodes. Based on our study, we conclude that the CuO and ZnO NCs, containing 10 % of ZnO, were the most effective photocatalyst for DG and FB dyes and electrochemical sensor for Arsenic.

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“…Because ZnO was present on the surface of CuO, a new energy level below the material‘s conduction band was created, making it simple to excite electrons. [72,73] …”

Section: Resultsmentioning

confidence: 99%

Section: Photocatalytic Degradation Of Direct Green (Dg) and Fast Blu...mentioning

confidence: 99%

Bimetallic CuO−ZnO Hybrid Nanocomposite Materials for Efficient Remediation of Environmental Pollutants

Rudresha

Hussain

Ravikumar³

et al. 2023

ChemistrySelect

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“…Предложены различные методы синтеза наночастиц оксида лантана: с использованием химического осаждения в ванне, методами соосаждения, гидратации, гидротермальной реакции, микроэмульсии, рефлюкса, золь-гель методов, сжигания раствора, сольвотермического, сонохимического методов, пиролиза распылением и методом термического разложения [19]. Несмотря на это, для биомедицинских применений крайне желательно использовать именно метод зеленой химии -не сопровождающийся применением в процессе синтеза токсических веществ и не наносящй вред биологическим объектам.…”

Section: Discussionunclassified

Antibacterial Action of Lanthanum Nanoparticles

Довнар¹,

Васильков²,

Довнар³

et al. 2023

Кардиология В Беларуси

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Введение. Проблемой современной сердечно-сосудистой хирургии становится возрастание антибиотикорезистентности клинических патогенных штаммов. На фоне постепенного развития медицины наблюдаются закономерный процесс увеличения продолжительности жизни и связанные с ними процессы старения населения и повышения количества пациентов с хроническими заболеваниями, приводящими к снижению защитных сил организма. В результате возникает необходимость поиска новых классов антимикробных препаратов, одними из которых могут стать наночастицы лантана. Цель. Синтезировать наночастицы лантана, изучить их свойства и воздействие на клинические патогенные штаммы микроорганизмов. Материалы и методы. В качестве способа синтеза наночастиц лантана был использован метод металло-парового синтеза. Антибактериальное действие наночастиц лантана исследовалось на двух штаммах грамположительных (Staphylococcus aureus и Staphylococcus haemolyticus) и четырех штаммах грамотрицательных бактерий (Escherichia coli, Klebsiella pneumoniae, Proteus mirabilis и Pseudomonas aeruginosa). Противогрибковое – на штамме Candida spp. Противомикробные и противогрибковые свойства данных наночастиц изучались с помощью диско-диффузионного метода и метода серийных разведений в жидкой питательной среде. Результаты. Выполненные исследования показали, что наночастицы лантана обладают выраженными противомикробными и противогрибковыми свойствами по отношению к клиническим патогенным штаммам. Учитывая наличие полиантибиотикорезистентности у изучаемых штаммов, применение наночастиц лантана является перспективным направлением как в хирургии в целом, так и в кардиохирургии в частности, особенно при наличии гнойно-септических осложнений. Заключение. Наночастицы лантана являются перспективным и малоизученным классом веществ, проявляющим выраженное антибактериальное и противогрибковое действие по отношению к полиантибиотикорезистентным штаммам. Это указывает на необходимость проведения дальнейших исследований, особенно касающихся механизмов действия наночастиц, а также открывает новые перспективы их применения в различных областях хирургии. Introduction. An increasing antibiotic resistance of clinical pathogenic strains has become a problem in modern cardiovascular surgery. Against the background of a progressive development of medicine, a natural process of longevity increase and associated processes of population aging and increasing number of patients with chronic diseases, leading to a decrease in body’s defenses are observed. As a result, the need arises to search for new classes of antimicrobial agents, one of which could be lanthanum nanoparticles. Purpose. To synthesize lanthanum nanoparticles, to study their properties and effects on clinical pathogenic strains of microorganisms. Materials and methods. The metal-vapor synthesis method was used to synthesize lanthanum nanoparticles. Antibacterial effects of lanthanum nanoparticles were studied on two gram-positive strains: Staphylococcus aureus and Staphylococcus haemolyticus, and four strains of gram-negative bacteria: Escherichia coli, Klebsiella pneumoniae, Proteus mirabilis and Pseudomonas aeruginosa. Antifungals effects were studied on Candida spp. strain. Antimicrobial and antifungal properties of these nanoparticles were studied using the disk diffusion method and the method of serial dilutions in a liquid nutrient medium. Results. The studies performed demonstrated that lanthanum nanoparticles had pronounced antimicrobial and antifungal activities against clinical pathogenic strains. Given the presence of polyantibiotic resistance in the strains studied, the use of lanthanum nanoparticles is a promising direction both in surgery in general and in cardiac surgery in particular, especially in the presence of purulent-septic complications. Conclusion. Lanthanum nanoparticles represent a promising and understudied class of substances exhibiting pronounced antibacterial and antifungal activities against polyantibiotic-resistant strains. Therefore, this points towards a need for further research, especially regarding mechanisms of action of nanoparticles, and opens up new perspectives for their application in various fields of surgery.

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“…The discoloration of FB aqueous solution evaluated the photocatalytic activity of CuO NPs. As shown in Figure 7a,b, after 120 min of UV light, the photo discoloration rate of FB dye decolorized up to 58.75%, 66.5%, 83.4%, and 74.3% for CuO, CuO + 5% ZnO, CuO + 10% ZnO and CuO + 15% ZnO, respectively [68,69]. The discoloration percentage of the dyes was determined using Equation (11):…”

Section: Photocatalytic Studiesmentioning

confidence: 99%

“…Simultaneously, water may oxidize to a hydroxyl radical ( • OH) while reacting with h + at the (VB) of ZnO thereby improving the photocatalytic efficiency. As a result, many electrons are collected at the CB of ZnO because ZnO is more negative than CuO and tends to flow from the CB of ZnO to the CB of CuO [68]. Furthermore, the electrons in CB of ZnO and CuO may not react with the adsorbed O 2 on the catalyst's surface to generate O 2 Consequently, the amount of CuO + 10% ZnO photocatalyst determines the dye's photo discoloration activity.…”

Section: Photocatalytic Studiesmentioning

confidence: 99%

Probe-Sonicated Synthesis of CuO–ZnO Hybrid Nanocomposite for Photocatalytic and Supercapacitor Applications

BaQais,

Alam,

Farhan

et al. 2023

Inorganics

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An ultrasound-assisted probe sonication route effectively prepared pure CuO and two-dimensional CuO-ZnO nanocomposites (NCs) for different ratios of CuO and ZnO, and the experimental and theoretical methods investigated the structural, photocatalytic, and electrochemical properties. The XRD (X-ray diffraction) patterns revealed a crystallite size (D) range of 25 to 31 nm for pure CuO and CuO-ZnO NCs. According to calculations, the sample’s optical energy bandgap value (Eg) for the NCs is between 1.72 and 2.15 eV. Under UV light irradiation, the photocatalytic discoloration of pure CuO and CuO-ZnO NCs on fast blue (FB) dye was assessed. Under the influence of UV light, the CuO with 10% ZnO composite degrades 83.4% of the dye, which is greater than pure CuO and other NCs. The electrochemical properties of the prepared NCs materials have been studied using cyclic voltammetry and electrochemical impedance spectroscopy (EIS). The specific capacitance values were found to be 248 Fg−1, 301 Fg−1, 352 Fg−1, and 277 Fg−1 for CuO, CuO + 5% ZnO, CuO + 10% ZnO, and CuO + 15% ZnO, respectively, at 1 A/g current density. Galvanostatic charge–discharge tests for these designed NCs show excellent capacitance performance in supercapacitors applications. These innovative results could be considered for expanding novel resources to scale for dual applications in photocatalysis and supercapacitors.

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Synthesis and Characterization of Green CuO using Centella Asiatica Plant Leaf Extract: Electrochemical and Photocatalytic Activities

Cited by 11 publications

References 15 publications

Bimetallic CuO−ZnO Hybrid Nanocomposite Materials for Efficient Remediation of Environmental Pollutants

Bimetallic CuO−ZnO Hybrid Nanocomposite Materials for Efficient Remediation of Environmental Pollutants

Antibacterial Action of Lanthanum Nanoparticles

Probe-Sonicated Synthesis of CuO–ZnO Hybrid Nanocomposite for Photocatalytic and Supercapacitor Applications

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