Green synthesis, morphological and optical studies of CuO nanoparticles

Reddy, K. Rayapa

doi:10.1016/j.molstruc.2017.09.005

Cited by 172 publications

(52 citation statements)

References 29 publications

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“…The acid treatment of algae can dissolve polysaccharide compounds in the outer layer of the cell wall to a certain extent, thus creating additional binding sites (usually amino groups), which can be associated to the decreasing of the intensity of nitro group at -700 cm -1 . In addition, the IR bands at around 600-650 cm −1 ascribed to the stretching vibration of Cu-O bond in monoclinic CuO, which was also observed in other works related to bioreduction of copper oxide nanoparticles on the cell wall of different species (Reddy, 2017;Usman et al, 2013).…”

Section: Ftirsupporting

confidence: 74%

Recovery of Copper from Leached-Tailing Solutions by Biosorption

Cortés¹,

Soto²,

Ordóñez³

2020

Preprint

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Mining is one of the main economic activities of several developing countries as Chile. Due to the progressive fall of the ore grades and the increasingly refractory composition of minerals, concentrating plants have increased that has led to an increase in the generation of tailings. Tailings, especially those obtained in the past, have remaining copper and other valuable species in quantities that can potentially be recovered, such as gold, silver, vanadium and rare earth elements. This transforms this abundant waste into a potential source of precious or strategic metals for secondary mining. One of the techniques of solid-liquid separation that allows the processing of solutions with low concentrations of metals corresponds to the adsorption, and more recently the biosorption, which is based on the use of biological matrices that do not constitute an environmental liability after application. Biosorption occurs as a consequence of the wide variety of active functional groups present in the different types of biomass. Bacterial, fungal, plant and algal biomasses have been described as biosorbents, mainly for the treatment of diluted and simple solutions. This work aims to recover copper from leached tailings using biomass of the red algae Gracilaria chilensis as a biosorbent. The tailing samples were taken from an abandoned deposit in the north of Chile and after an acid leaching copper was biosorbed, for which the kinetics of adsorption and the equilibrium isotherms were studied, applying the Freundlich and Langmuir models. Operational parameters such as adsorbent dose, pH and initial metal concentration were studied.

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Section: Ftirsupporting

confidence: 74%

Recovery of Copper from Leached-Tailing Solutions by Biosorption

Cortés¹,

Soto²,

Ordóñez³

2020

Preprint

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“…Several approaches for CuO synthesis and surface modification have been proposed through utilizing various parts of plants such as leaves, fruit, and flowers [21][22][23][24]. Several microorganisms, plants, and plant extracts have been extensively used to synthesize CuO nanoparticles (Table 1) to avoid the consumption of toxic chemicals [20][21][22][23][24][25][26][27][28][29][30][31][32][33][34][35][36][37][38]. The O. sanctum (Tulsi) is supposed to contain oleanolic acid, rosmarinic acid, eugenol, carvacrol, Linalool, β-caryophyllene, and ursolic acid [39][40][41][42].…”

Section: Introductionmentioning

confidence: 99%

“…Copper oxide nanoparticles prepared in Plant Extracts by chemical reduction methods[21][22][23][24][25][26][27][28][29][30][31][32][33][34][35][36][37][38] …”

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confidence: 99%

Biosynthesis of Flower-Shaped CuO Nanostructures and Their Photocatalytic and Antibacterial Activities

Siddiqui¹,

2020

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HIGHLIGHTS• Eugenol (4-allyl-2-methoxyphenol) extracted from O. sanctum leaves is used as a natural reducing agent for the synthesis of CuO nanoflowers (NFs).• CuO-NFs can degrade methylene blue with an efficiency of 90%. • CuO-NFs offer a new vision to deactivate multi-drug microorganisms. A B S T R AC T C o pper oxide nanoflowers (CuO-NFs) have been synthesized through a novel green route using Tulsi leaves-extracted eugenol (4-allyl-2-methoxyphenol) as reducing agent. Characterizations results reveal the growth of crystalline singlephase CuO-NFs with monoclinic structure. The prepared CuO-NFs can effectively degrade methylene blue with 90% efficiency. They also show strong barrier against E. coli (27 ± 2 mm) at the concentration of 100 µg mL −1 , while at the concentration of 25 µg mL −1 weak barrier has been found against all examined bacterial organisms. The results provide important evidence that CuO-NFs have sustainable performance in methylene blue degradation as well as bacterial organisms.

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“…Copper oxide nanoparticles (CuO NPs) K. Rayapa Reddy reported the green approach of CuO NPs synthesis using Calotropis procera which belongs to the asclepiadaceous family [29]. These NPs are widely used in many applications such as catalysis because of their narrow band gap, used in photo catalytic properties [30].…”

Section: Green Synthesis Of Metallic Nanoparticles (Mnps)mentioning

confidence: 99%

Current developments in green synthesis of metallic nanoparticles using plant extracts: a review

Yadi

Mostafavi

Saleh

et al. 2018

Artificial Cells, Nanomedicine, and Biotechnology

189

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Metal nanoparticles (MNPs) produced by green approaches have received global attention because of their physicochemical characteristics and their applications in the field of biotechnology. In recent years, the development of synthesizing NPs by plant extracts has become a major focus of researchers because of these NPs have low hazardous effect in the environment and low toxicity for the human body. Synthesized NPs from plants are not only more stable in terms of size and shape, also the yield of this method is higher than the other methods. Moreover, some of these MNPs have shown antimicrobial activity which is consistently confirmed in past few years. Plant extracts have been used as reducing agent and stabilizer of NPs in which we can reduce the toxicity in the environment as well as the human body only by not using chemical agents. Furthermore, the presence of some specific materials in plant extracts could be extremely helpful and effective for the human body; for instance, polyphenol, which may have antioxidant effects has the capability for capturing free radicals before they can react with other biomolecules and cause serious damages. In this article, we focused on of the most common plants which are regularly used to synthesize MNPs along with various methods for synthesizing MNPs from plant extracts.

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Green synthesis, morphological and optical studies of CuO nanoparticles

Cited by 172 publications

References 29 publications

Recovery of Copper from Leached-Tailing Solutions by Biosorption

Recovery of Copper from Leached-Tailing Solutions by Biosorption

Biosynthesis of Flower-Shaped CuO Nanostructures and Their Photocatalytic and Antibacterial Activities

Current developments in green synthesis of metallic nanoparticles using plant extracts: a review

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