Studies on the chemical synthesis and characterization of lead oxide nanoparticles with different organic capping agents

Arulmozhi, K.; Mythili, N.

doi:10.1063/1.4858419

Cited by 110 publications

(61 citation statements)

References 23 publications

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“…Citrate contains three carboxylate groups and likely binds to Pb 2+ via the oxygen/carbonyls of the carboxylate groups. 28 The Pb-O 29 and the Pb-OOC interaction in ethylenediaminetetraacetic acid (EDTA) 30 have been reported to display strong absorption in this short wavelength region.…”

Section: Origins Of the Reversible Agglomerationmentioning

confidence: 99%

Dynamics of Silver Nanoparticles in Aqueous Solution in the Presence of Metal Ions

et al. 2017

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Using a combined UV-vis, DLS, and electrochemical approach, this work experimentally studies the physical origin of the observed colorimetric sensitivity of aqueous silver nanoparticles toward divalent metal ions. In the presence of Pb, AgNPs are slow to reversibly form agglomerates (the time scale of the reverse deagglomeration process is of the order of hours). This agglomeration is shown to be induced by complex formation between Pb and citrate groups localized on the AgNPs, reducing surface charges (zeta-potential) and hence electrostatic repulsion between the AgNPs. Other divalent metal ions including Ca, Cd, Zn, Ni, Co, and Sn are also studied, and the resulting sizes of the AgNPs clusters and the extents of the UV-vis spectrum red-shift in λ have a strong positive correlation with the metal-ligand (citrate) complex formation constant (K). This work thus serves as a guide for the selection of capping agents on the basis of K and demonstrates the correlation between sizes and spectrophotometric as well as electrochemical responses of the AgNPs clusters. Importantly, we give further physical insights into the size-dependent properties of AgNPs and emphasize the difference between theoretical and experimental values of extinction coefficients, where the latter is affected by the angle-dependent scattering intensities and the measurement technique used.

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Section: Origins Of the Reversible Agglomerationmentioning

confidence: 99%

Dynamics of Silver Nanoparticles in Aqueous Solution in the Presence of Metal Ions

et al. 2017

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“…Finally, in zone VI, the band at 672 cm −1 , which comes from the interaction between the organic molecule and lead, is wider and has higher intensity. This type of interaction has been seen in the synthesis of lead nanoparticles [41], and is related to Pb-O asymmetric bending vibration (Figure 15b). Figure 14 shows the results obtained for the removal of Pb ions.…”

Section: Removal Of Methyl Orange and Methyl Redmentioning

confidence: 58%

Evaluation of a Dynamic Bioremediation System for the Removal of Metal Ions and Toxic Dyes Using Sargassum Spp.

López-Miranda

Silva

Molina

et al. 2020

JMSE

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This work presents the results obtained in the design and manufacture of a simple, economic and ecological filter based on Sargassum spp. (Sspp), consisting of the species S. natans and S. fluitans, for the elimination of organic and inorganic toxic substances. The main objective is to make use of Sspp, as the massive amounts of this alga arriving at the Mexican Caribbean coast have caused serious problems over recent years. The toxic substances treated were organic dyes (methyl blue, methyl orange and methyl red) and the metal ion, lead (II). To obtain optimal removal conditions, grinding of the Sspp used, its mass and humidity were evaluated. In the design of the filter the area, flow rate and the number of layers were evaluated. Removal rates of almost 100%, 65% and 25% were obtained for methylene blue, methyl red and methyl orange respectively, and in the case of lead (II), values up to 95% were obtained. After the tests, the Sspp was characterized, using Fourier Transform Infrared (FTIR) spectroscopy and scanning electron microscopy, showing the presence of the dyes and the ionic species. These results demonstrate the efficiency of the dynamic Sspp-based filtration system proposed, which can be industrially scaled for the treatment of water contaminated with these kinds of substances.

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“…This variation could be associated to the ability of the PEG 12 -C 18 to act as a capping agent due to the O-H bond present at the end of the molecule, which rises the hydrophilic character of the UroGm-SNs. The conjugated peptide could then behave as a new surfactant molecule due to its amphiphilic character [24]. Variation in charge towards more negative values was also observed indicating an e cient association of the negative conjugate to the nanosystem surface.…”

Section: Development Of a Targeted Nanosystemmentioning

confidence: 97%

Uroguanylin-decorated Nanosystems Containing Etoposide, a Potential Targeted Combination Therapy for Colorectal Cancer

Bouzo

Lores

Jatal

et al. 2020

Preprint

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Colorectal cancer is the third most frequently diagnosed cancer malignancy and the second leading cause of cancer-related deaths worldwide. Guanylyl Cyclase C (GCC), a membrane receptor that is expressed in 95% of primary and metastatic colorectal cancer tumors is a promising target for the design of new drug delivery strategies. In this work we propose the use of Uroguanylin (UroG), a natural ligand for GCC, for the preparation of targeted sphingomyelin-based nanosystems (UroG-SNs). The results from in vitro cell culture studies showed that UroG-SNs have a specific interaction with the GCC receptor, resulting in an antiproliferative response. Subsequently, the anti-cancer drug etoposide (Etp) was encapsulated into the UroG-SNs. The evaluation of the resulting system showed a synergistic effect of the two drugs, thus highlighting the therapeutic potential of this strategy for the treatment of colorectal cancer.

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Studies on the chemical synthesis and characterization of lead oxide nanoparticles with different organic capping agents

Cited by 110 publications

References 23 publications

Dynamics of Silver Nanoparticles in Aqueous Solution in the Presence of Metal Ions

Dynamics of Silver Nanoparticles in Aqueous Solution in the Presence of Metal Ions

Evaluation of a Dynamic Bioremediation System for the Removal of Metal Ions and Toxic Dyes Using Sargassum Spp.

Uroguanylin-decorated Nanosystems Containing Etoposide, a Potential Targeted Combination Therapy for Colorectal Cancer

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