Starch functionalized creatine for stabilization of gold nanoparticles: Efficient heterogeneous catalyst for the reduction of nitroarenes

Dasvarz, Neda; Shojafar, Mohammad; Sansano, José M.

doi:10.1016/j.ica.2019.118965

Cited by 28 publications

(10 citation statements)

References 54 publications

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“…[38][39][40] Also, the peak located at 398.7 eV represented the tertiary N bonded to carbon atoms (Figure 2d). [41] It is worth mentioning that presence of N 1 s of imidazole peak in Co-Cu/ZIF compared to Co-Cu precursor confirm successful formation of ZIF framework ( Figure S5 in ESI).…”

Section: Characterizationmentioning

confidence: 79%

Co/Cu bimetallic ZIF as New heterogeneous catalyst for reduction of nitroarenes and dyes

Naghshbandi

Sansano

2020

Applied Organom Chemis

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Nowadays one of the great challenges is to design new bimetallic catalysts with enhanced catalytic activity, selectivity and recycling properties. In this work, the preparation of new Co/Cu bimetallic Zeolitic Imidazolate Framework (Co‐Cu/ZIF) as an efficient catalyst for the reduction of nitro compounds and organic dyes is described. Co‐Cu/ZIF was characterized with different techniques such as SEM, TEM, XRD, XPS, TGA, FT‐IR and UV–vis absorption indicating formation of entirely uniform cubic particles. Using this catalyst, structurally different aromatic nitro compounds were reduced efficiently to corresponding amines in excellent yields. Kinetic studies revealed that the reduction rates of nitrophenol isomers follow 3‐NP > 4‐NP > 2‐NP order. The catalytic activity of Co‐Cu/ZIF was further investigated in the reduction of organic dyes such as methyl orange (MO) and rhodamine B (RhB). This catalyst was recycled for at least ten runs in the reduction of 4‐nitrophenol without a noticeable decrease in activity and reused catalyst was characterized.

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Section: Characterizationmentioning

confidence: 79%

Co/Cu bimetallic ZIF as New heterogeneous catalyst for reduction of nitroarenes and dyes

Naghshbandi

Sansano

2020

Applied Organom Chemis

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“…Four weak peaks at 784.9, 787.2, 801.5, and 804.4 are satellites 53–55 . In the Au 4f spectrum two strong peaks with binding energy (BE) at 83.2 and 86.9 are ascribed to Au(0) species 56,57 . XPS spectrum in N 1s region showed two main peaks at 399.2 and 401.6 corresponding to C=N and C–N bonds in the imidazolium ring 58,59 .…”

Section: Resultsmentioning

confidence: 99%

Bimetallic AuCo supported on magnetic crosslinked copoly(ionic liquid) nanohydrogel and study of its catalytic activity

Gholinejad,

Mozafari,

Nikfarjam

et al. 2023

Applied Organom Chemis

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Synergistic effects in bimetallic catalysts produce a catalyst with superior activity than a monometallic component. In this work, a novel magnetic crosslinked copoly(ionic liquid) nanohydrogel was synthesized and employed for the stabilization of AuCo bimetallic nanoparticles (Fe3O4@PolyIL‐AuCo). This material was characterized using different instrumental techniques such as FT‐IR, TGA, XPS, VSM, solid‐state UV–Vis, SEM mapping, and TEM. Results indicated a narrow size distribution of nanoparticles and high water dispersibility of Fe3O4@PolyIL‐AuCo. Using this catalyst, a series of nitroarenes were reduced to the corresponding amines in aqueous media. In addition, organic dyes were efficiently degraded by this catalyst. Different experiments dealing with the same transformation confirmed that Fe3O4@PolyIL‐AuCo exhibited higher catalytic activity than the similar monometallic Au and Co catalysts. This catalyst was recycled for at least 11 consecutive runs with very small deactivation, and TEM, VSM, and XPS confirmed the stability of the reused catalyst.

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“…Starch is a class of biological macromolecules composed of α‐D‐glucopyranose linked by glycosidic bonds, which has strong mechanical properties, high surface energy and high biocompatibility [16] . In addition, starch has the characteristics of low toxicity, complete biodegradability, high water absorption and expansion, low cost, renewability and a large number of hydroxyl groups, which make it excellent carrier for the immobilized enzymes [17,18] …”

Section: Introductionmentioning

confidence: 99%

Preparation and Catalytic Properties of Lipase Immobilized on Epoxy‐functionalized Starch Nanoparticles

Wang

Dong

et al. 2023

ChemistrySelect

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As a natural macromolecular material, starch is an ideal carrier for enzyme immobilization because of its widely available source, easy regeneration and excellent biodegradability. However, the natural starch cannot be directly used for immobilization due to the large particle size and excessive hydrophilicity. In this paper, the epoxy groups were grafted onto esterified starch by bifunctional reagents. The grafting efficiency of epoxy groups was increased by starvation drop addition. The changes of contact angle and particle size are conducive to the adsorption of immobilized enzyme at the water oil interface in the subsequent enzyme catalytic reaction, hence improve of the lipase activity. The maximum amount of lipase mobilized on such modified starch was ∼143.7 mg/g, which was near 40 mg/g higher than that of those from direct crosslinking. The immobilized enzymes showed excellent resistance to organic solvents and good reusability. Immobilization of lipases on epoxy‐functionalized starch nanoparticles can potentially improves the possibility of enzymes industrial application.

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Starch functionalized creatine for stabilization of gold nanoparticles: Efficient heterogeneous catalyst for the reduction of nitroarenes

Cited by 28 publications

References 54 publications

Co/Cu bimetallic ZIF as New heterogeneous catalyst for reduction of nitroarenes and dyes

Co/Cu bimetallic ZIF as New heterogeneous catalyst for reduction of nitroarenes and dyes

Bimetallic AuCo supported on magnetic crosslinked copoly(ionic liquid) nanohydrogel and study of its catalytic activity

Preparation and Catalytic Properties of Lipase Immobilized on Epoxy‐functionalized Starch Nanoparticles

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