Iridium nanostructured metal oxide, its inclusion in silica matrix and their activity toward photodegradation of methylene blue

Dı́az, Carlos; Valenzuela, Marı́a Luisa; Cifuentes-Vaca, Olga L.; Segovia, Marjorie; Laguna‐Bercero, M. A.

doi:10.1016/j.matchemphys.2020.123276

Cited by 13 publications

(11 citation statements)

References 37 publications

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“…Similar behaviour was observed in all other synthesized macromolecular complexes. The degree of metallic coordination to the polymeric materials, was calculated on the base of the amount (%) of nal residue, ZnO, obtained in each TG/DTA analyses [54,55]. Thus, coordination degrees ranging from > 99% to 47% were observed depending on the employed polymeric material and metallic source, see Supplementary information S3.…”

Section: Resultsmentioning

confidence: 99%

“…On the other hand, using organic polymers based on poly(4-vinylpyridine) (P4VP) chains, as PSP-co-P4VP (PS = polystyrene), or Chitosan, the pure metal oxide M x O y nanoparticles were successfully achieved. [42][43][44][45][46][47][48][49][50][51][52][53][54][55][56][57][58] Thus, and aiming to evaluate the combined effect of both polyphosphazenes and poly(vinylpiridine) materials in the formation of metallic nanoparticles, in this report we describe the synthesis of metallic phosphate nanoparticles of europium by using polyphosphazene-b-poly(2-vinylpiridine) (PP-b-P2VP) block copolymers as a solidstate template. Also, and as model reactions, we describe the formation of pure Pt nanoparticles and metal oxide nanoparticles (ZnO and Eu 2 O 3 ) by using P2VP and P4VP homopolymers as solid-state templates.…”

Section: Introductionmentioning

confidence: 99%

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Synthesis of Metallic and Metal Oxides Nanoparticles by using Poly(4- vinylpyridine) (P4VP), Poly(2-vinylpyridine) (P2VP) Homopolymers and Polyphosphazene-b-P2VP Block Copolymers as Solid Templates

Cortés,

Díaz,

Valenzuela

et al. 2023

Preprint

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Starting from poly(4-vinylpyridine) [(P4VP)n; Mw = 6000 (1a); 160000 (1b)]; poly(2-vinylpyridine) Mw = 37500 (1c) and [N=P(O2CH2CF3)]m-b-P2VP20 block copolymers [m = 20 (2a); 60 (2b) and 100 (2c)], series of metal- containing homopolymers {[P4VP(PtCl2)x]6000 (1a-Pt), [P4VP(PtCl2)x]160000 (1b-Pt), [P2VP(PtCl2)x]37500 (1c-Pt), [P4VP(ZnCl2)x]6000 (1a-Zn), [P4VP(ZnCl2)n]160000 (1b-Zn), [P2VP(ZnCl2)n]37500 (1c-Zn), [P4VP(Eu(NO3)3]6000 (1a-Eu), and [P4VP(Eu(NO3)3]160000 (1b-Eu) P2VP[(Eu(NO3)3]37500 (1c-Eu) and block copolymers {[N=P(O2CH2CF3)]20-b-[P2VP(Eu(NO3)3)x]20 (2a-Eu), [N=P(O2CH2CF3)]60-b-[P2VP(Eu(NO3)3)x]20 (2b-Eu) and [N=P(O2CH2CF3)]100-b-[P2VP(Eu(NO3)3)x]20 (2c-Eu)} have been successfully prepared by using a direct a straight forward solution metodólogy. Solid-state pyrolysis of the as prepared metal containing polymeric precursors lead to the formation of a variety of different metallic and metal oxide nanoparticles (Pt, ZnO, Eu2O3 and EuPO4) depending on the composition and nature of the polymeric template precursor. Thus, whereas Eu2O3 nanostructures were obtained from europium-containing homopolymers (1a-Eu, 1b-Eu and 1c-Eu), EuPO4 nanostructures were achieved when phosphorus-containing block copolymer precursors (2a-Eu, 2b-Eu and 2c-Eu) were employed. Importantly, and although both Eu2O3 and EuPO4 nanostructures exhibit a strong luminescence emission, this is strongly influenced by the nature and composition of the macromolecular metal-containing polymer template. Thus, when P2VP europium-containing homopolymers (1a-Eu, 1b-Eu and 1c-Eu) were employed, the highest emission intensity corresponds to the lowest molecular weight homopolymer template (1a-Eu), whereas opposite behavior was observed when block copolymer precursors (2a-Eu, 2b-Eu and 2c-Eu) were used (highest emission intensity corresponds to 2c-Eu). The intensity ratio of the emission transitions 5D0→ 7F2/5D0→ 7F1 suggest a different symmetry around the Eu3+ ions depending on the nature of the polymeric precursor, which also influences the sizes of the as prepared Pt, ZnO, Eu2O3 and EuPO4 nanostructures.

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Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Synthesis of Metallic and Metal Oxides Nanoparticles by using Poly(4- vinylpyridine) (P4VP), Poly(2-vinylpyridine) (P2VP) Homopolymers and Polyphosphazene-b-P2VP Block Copolymers as Solid Templates

Cortés,

Díaz,

Valenzuela

et al. 2023

Preprint

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“…The relative fraction of IrO 2 /Ir depends on the temperature, producing Ir 2 O 3 at temperatures between 250 and 400 • C, and then obtaining pure IrO 2 at temperatures above 600 • C [108][109][110][111][112][113][114]. Using our method, we have obtained a unique nanostructured phase of IrO 2 [63]. The IrO 2 nanoparticles were prepared by thermal treatment of the macromolecular chitosan•(IrCl 3 ) X and PSP-4-PVP•(IrCl 3 ) X precursors.…”

Section: Iridiummentioning

confidence: 99%

“…The inclusion of IrO 2 into SiO 2 was performed using a combined solution of the chitosan and PVP precursors using the sol-gel method [63]. Subsequent pyrolysis of the isolated solid-state chitosan•(IrCl 3 ) x (SiO 2 ) y and PSP-4-PVP•(IrCl 3 )x(SiO 2 ) y give rise to the IrO 2 //SiO 2 nanocomposites.…”

Section: Incorporation Of Metallic and Metal Oxides Into Solid Matrixmentioning

confidence: 99%

Solid-State Preparation of Metal and Metal Oxides Nanostructures and Their Application in Environmental Remediation

Dı́az

Valenzuela

Laguna‐Bercero

2022

IJMS

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Nanomaterials have attracted much attention over the last decades due to their very different properties compared to those of bulk equivalents, such as a large surface-to-volume ratio, the size-dependent optical, physical, and magnetic properties. A number of solution fabrication methods have been developed for the synthesis of metal and metal oxides nanoparticles, but few solid-state methods have been reported. The application of nanostructured materials to electronic solid-state devices or to high-temperature technology requires, however, adequate solid-state methods for obtaining nanostructured materials. In this review, we discuss some of the main current methods of obtaining nanomaterials in solid state, and also we summarize the obtaining of nanomaterials using a new general method in solid state. This new solid-state method to prepare metals and metallic oxides nanostructures start with the preparation of the macromolecular complexes chitosan·Xn and PS-co-4-PVP·MXn as precursors (X = anion accompanying the cationic metal, n = is the subscript, which indicates the number of anions in the formula of the metal salt and PS-co-4-PVP = poly(styrene-co-4-vinylpyridine)). Then, the solid-state pyrolysis under air and at 800 °C affords nanoparticles of M°, MxOy depending on the nature of the metal. Metallic nanoparticles are obtained for noble metals such as Au, while the respective metal oxide is obtained for transition, representative, and lanthanide metals. Size and morphology depend on the nature of the polymer as well as on the spacing of the metals within the polymeric chain. Noticeably in the case of TiO2, anatase or rutile phases can be tuned by the nature of the Ti salts coordinated in the macromolecular polymer. A mechanism for the formation of nanoparticles is outlined on the basis of TG/DSC data. Some applications such as photocatalytic degradation of methylene by different metal oxides obtained by the presented solid-state method are also described. A brief review of the main solid-state methods to prepare nanoparticles is also outlined in the introduction. Some challenges to further development of these materials and methods are finally discussed.

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“…The mentioned species is a potent agent capable of attacking MB-molecules and breaking them down into more minor compounds through oxidation-reduction reactions (Ibrahim et al 2020;Abdelwahab et al 2020;Norouzi et al 2021). As a result, the use of photocatalysts for environmental remediation has gained a lot of attention in recent years, as air and water contamination are potentially the most serious environmental threats to human health (Diaz et al 2020;Naing et al 2020). Mixed metal oxides are especially interesting because they allow the production of materials intermixed at the atomic level (Sun et al 2020;Karuppusamy et al 2021).…”

Section: Introductionmentioning

confidence: 99%

Mesoporous spongy Ni–Co oxides@wheat straw-derived SiO2 for adsorption and photocatalytic degradation of methylene blue pollutants

et al. 2022

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The exploitation and employment of agricultural waste in polluted water treatment is one of the most important cost-effective approaches. Therefore, a novel mesoporous spongy adsorbent/photocatalyst was successfully synthesized through the grafting of nickel and cobalt oxides nanocomposites with wheat straw-derived SiO2. Nickel and cobalt oxides were added to enhance the functionality of wheat straw-derived SiO2. This synthesis methodology presents a simplistic, cost-effective, and eco-approachable alternative to getting an adsorbent and photocatalyst for the adsorption and photocatalytic degradation of methylene blue (MB) pollutants from wastewater. The modified wheat straw-derived SiO2 (MWSS) was characterized via XRD, SEM, EDX, TGA, FTIR, and nitrogen adsorption. Molecular dynamics computational calculations were performed to comprehend the ability of methylene blue to adjust the WSDS surface. The experiments of adsorption and photodegradation trials were performed to optimize the pH, contact time, initial MB-concentration, and temperature parameters. Furthermore, kinetics and isotherm models were checked to explain the MBremoval mechanism using mesoporous spongy MWSS. The current work indicated that the 2 mesoporous MWSS adsorbent/photocatalyst provided efficient adsorption capability (79%), significant photocatalytic performance (93%), and higher solidity during reusability as well.This study suggests an efficient composite that contributes to getting rid of the MB pollutants from wastewater.

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Iridium nanostructured metal oxide, its inclusion in silica matrix and their activity toward photodegradation of methylene blue

Cited by 13 publications

References 37 publications

Synthesis of Metallic and Metal Oxides Nanoparticles by using Poly(4- vinylpyridine) (P4VP), Poly(2-vinylpyridine) (P2VP) Homopolymers and Polyphosphazene-b-P2VP Block Copolymers as Solid Templates

Synthesis of Metallic and Metal Oxides Nanoparticles by using Poly(4- vinylpyridine) (P4VP), Poly(2-vinylpyridine) (P2VP) Homopolymers and Polyphosphazene-b-P2VP Block Copolymers as Solid Templates

Solid-State Preparation of Metal and Metal Oxides Nanostructures and Their Application in Environmental Remediation

Mesoporous spongy Ni–Co oxides@wheat straw-derived SiO2 for adsorption and photocatalytic degradation of methylene blue pollutants

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