Copper upcycling by hierarchical porous silica spheres functionalized with branched polyethylenimine: Antimicrobial and catalytic applications

Fuentes, Keyla; Onna, Diego; Rioual, Thibault; Huvelle, María Amparo Lago; Britto, Fiona; Simian, Marina; Sánchez-Domínguez, Margarita; Soler-Illia, Galo J.A.A.; Bilmes, Sara A.

doi:10.1016/j.micromeso.2021.111391

Cited by 12 publications

(8 citation statements)

References 51 publications

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“…Kinetic data obtained for the PEI microgel indicate a very fast first phase of around 10–20 min, which is typical for PEI-based materials, and commonly is described best by a pseudo-second-order model. − Consequently, kinetic data from these composites can be described as a combination of the same pseudo-second-order process representing the dominant complexation and an additional low-rate intraparticle diffusion stage that begins to approach the theoretical maximal adsorption capacity. The fast kinetic phase for PEI-based materials highlights them as more advantageous compared to chitosan-based adsorbents, which tend to adsorb copper slightly slower, reaching their maximal capacity in 20–40 min depending on particular formulations and particle size. ,,, …”

Section: Resultsmentioning

confidence: 98%

“…Porous types of silica represent a popular target for such surface functionalization, as they are widely accepted as time-tested, nontoxic, chemically, and mechanically stable adsorbents or drug vehicles for industrial, medical, and remediation purposes. From these considerations, a number of studies have been undertaken where PEI was grafted onto various mesoporous silica, − mesoporous diatomite particles (diatomaceous earth (DE)), , and hierarchical porous wrinkled-silica spheres, with the resulting materials having significantly improved binding abilities. In addition, a number of studies have demonstrated that with a low dependence on the nature of the composite counterpart, PEI-based materials have specific selectivity toward copper over other accompanying metals, such as Co(II), Ni(II), Zn(II), Al(III), Cd(III), Fe(II), Pb(II), Mn(II), Mg(II) and Ca(II). ,,,, Following this observation, any materials and composites developed on the basis of PEI are expected to be highly selective toward copper.…”

Section: Introductionmentioning

confidence: 99%

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Copper-Binding Properties of Polyethylenimine–Silica Nanocomposite Particles

et al. 2022

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Increasing demand for copper resources, accompanied by increasing pollution, has resulted in an urgent need for effective materials for copper binding and extraction. Polyethylenimine (PEI) is one of the strongest copper-chelating agents but is not suitable directly (as is) for most applications due to its high solubility in water. PEI-based composite materials show potential as efficient and practical alternatives. In the present work, the interaction of copper ions with PEI−silica nanocomposite particles and precursor PEI microgels (as a reference) is investigated. It is hypothesized that the main driving force of the reaction is chelation of copper ions by amino groups in the PEI network. The presence of silica in the PEI−silica composites was shown to increase the copperbinding capacity in comparison with the parent microgel. The copper-binding behavior of etched (PEI-free "ghost") composite particles in comparison with the original composites and microgel particles shows that silica nanoparticles in the composite structure increase the number of copper-binding sites in the PEI network rather than adsorbing copper themselves. PEI−silica composites can be easily recycled after copper adsorption by simply washing in 1 M nitric acid, which results in complete copper extraction. Employing this recovery method, PEI−silica composite particles can be used for multiple, efficient cycles of copper removal and extraction.

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Section: Resultsmentioning

confidence: 98%

Section: Introductionmentioning

confidence: 99%

Copper-Binding Properties of Polyethylenimine–Silica Nanocomposite Particles

et al. 2022

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“…Compared to the FTIR of CuS NSs, the Cu–S and C–S of CuS@PEI_GQDs NSs became sharper; however, the N–H at 3349 cm –1 of CuS is almost invisible; and compared to the FTIR of PEI_GQDs, the C–N at 1110 cm –1 in CuS@PEI_GQDs NSs increases; however, the wide peak of C–H (2808 and 2946 cm –1 ) and N–H (3349 cm –1 ) of PEI_GQDs greatly decreases. The above FTIR analysis indicates that there is an interaction between CuS NSs and PEI_GQDs, mainly deriving from the strong chelation between Cu 2+ and −NH 2 in PEI_GQDs. , …”

Section: Resultsmentioning

confidence: 87%

Photoheating Effects of CuS@PEI_GQDs Nanoshells under Near-Infrared Laser and Sunlight Irradiation

Zhang

Yang

2023

Crystal Growth & Design

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CuS nanoparticles (CuS NPs) have excellent photothermal conversion effects due to their strong and wide-band light absorption. The composite of CuS NPs may enhance the light absorption and photoheating effect, and their broad applications have appealed to wide interests. In this paper, ethylene imine polymer (PEI)-linked graphene quantum dots (PEI_GQDs) were easily obtained by an ultrasonic-assisted hydrothermal approach, and CuS nanoshells (NSs) were prepared with Cu 2 O NSs as a template. The composite of CuS@PEI_GQDs NSs was easily obtained by selfassembly due to the electrostatic attraction between PEI_GQDs and CuS NSs. The morphology, structure, surface chemistry, and optical absorption of the prepared nanomaterials were characterized by multimicroscopic techniques. The results of high-resolution transmission electron microscope (HRTEM), X-ray diffractometer (XRD), Fourier transform infrared (FTIR), X-ray photoelectronic spectroscopy (XPS), and energy-dispersive spectrum (EDS) show that the PEI_GQDs were successfully linked on the surfaces of the CuS NSs; the FTIR analysis reveals that there is an interaction between CuS NSs and PEI_GQDs by chelation between Cu 2+ and −NH 2 in PEI_GQDs. The pore size distribution indicated that both the CuS NSs and CuS@PEI_GQDs NSs contained mesopores in the wall shells. The CuS@PEI_GQDs NSs displayed enhanced absorption within 190−500 and 630−1100 nm compared to the CuS NSs. The photoheating effects of CuS@PEI_GQDs NSs and CuS NSs were investigated under 808 nm laser and sunlight irradiation, and CuS@PEI_GQDs NSs presented a better photoheating effect and photothermal stability than CuS NSs. Our results provide a facile approach to fabricate other GQD-coated nanomaterials. The excellent photoheating effects of CuS@ PEI_GQDs NSs are promising in photothermal conversion.

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“…Superoxide dismutase-like nanozymes Fig. 1 Mechanism of anti-microbial infections of nanozymes [25][26][27][28] 3 can convert superoxide radicals into H2O2 and O2, which can be used as an important antioxidant to protect normal tissues from ROS attack [29][30][31] . In the treatment of anti-microbial infections, aggressive ROS generated by nanozymes generally play a key role.…”

Section: Mechanism Of Anti-microbial Infections Of Nanozymes 1generat...mentioning

confidence: 99%

“…Researchers have used nanozymes for various areas such as disease diagnosis [19] , disease treatment [20][21] and detection [22][23][24] . In addition, many types of nanozymes have been used for antibacterial and antiviral treatments: metals [25] , metal oxides [26] , carbon dots [27] , mesoporous silica [28] , etc.…”

mentioning

confidence: 99%

Nanozyme: A new Approach for Anti-microbial Infections

Xuetong¹,

Ruofei²,

Xiyun³

et al. 2022

Journal of Inorganic Materials

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Bacteria and viruses have always posed a threat to human health. Most impressively, SARS-CoV-2 has been raging around the world for almost three years, causing huge loss to human health. Facing increasing challenges of drugresistance and poor treatment efficacy, new solutions are urgently needed to combat pathogenic microorganisms. Recently, nanozymes with intrinsic enzyme-like activities have emerged as a promising new type of "antibiotics".Nanozymes exhibit superior antibacterial and antiviral activities under physiological conditions by efficiently catalyzing generation of a large number of reactive oxygen species. Moreover, enhanced therapeutic effects are achieved in nanozyme-based therapy aided by the unique physicochemical properties of nanomaterials such as photothermal and photodynamic effects. This paper reviews the latest research progress in the field of anti-microbial nanozymes, systematically summarizes and analyzes the principles of nanozymes in the treatment of bacteria and viruses from a mechanistic point of view. An outlook on the future direction and the challenges of new anti-microbial infection nanomaterials are proposed to provide inspiration for developing next generation anti-microbial nanozymes.

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Copper upcycling by hierarchical porous silica spheres functionalized with branched polyethylenimine: Antimicrobial and catalytic applications

Cited by 12 publications

References 51 publications

Copper-Binding Properties of Polyethylenimine–Silica Nanocomposite Particles

Copper-Binding Properties of Polyethylenimine–Silica Nanocomposite Particles

Photoheating Effects of CuS@PEI_GQDs Nanoshells under Near-Infrared Laser and Sunlight Irradiation

Nanozyme: A new Approach for Anti-microbial Infections

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