Green synthesis of Fe<sub>3</sub>O<sub>4</sub> nanoparticles with controlled morphologies using urease and their application in dye adsorption

Shi, Haitang; Tan, Longfei; Du, Qijun; Chen, Xue; Li, Linlin; Liu, Tianlong; Fu, Changhui; Liu, Huiyu; Meng, Xianwei

doi:10.1039/c4dt01161a

Cited by 37 publications

(20 citation statements)

References 39 publications

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“…In addition, results of control experiments showed that the presence of Fe 3 O 4 -associated organic substances was required for the generation of rod-like magnetite after the addition of noble metal precursor salts. It has been reported that, in the presence of externally added organic substances, Fe 3 O 4 nanoparticles can self-assemble into nanorods, nanowires or nanosheets without temple through the interplay and balance of dipolar force, electrostatic interaction and van der Waals force 16 41 42 . The self-assembly of Fe 3 O 4 nanoparticles into oriented nanosheets was achieved through using a hydrophilic terpolymer as stabilizer under low pH conditions 42 .…”

Section: Discussionmentioning

confidence: 99%

Microbial synthesis of Pd/Fe3O4, Au/Fe3O4 and PdAu/Fe3O4 nanocomposites for catalytic reduction of nitroaromatic compounds

Tuo

Liu

Dong

et al. 2015

Sci Rep

116

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Magnetically recoverable noble metal nanoparticles are promising catalysts for chemical reactions. However, the chemical synthesis of these nanocatalysts generally causes environmental concern due to usage of toxic chemicals under extreme conditions. Here, Pd/Fe3O4, Au/Fe3O4 and PdAu/Fe3O4 nanocomposites are biosynthesized under ambient and physiological conditions by Shewanella oneidensis MR-1. Microbial cells firstly transform akaganeite into magnetite, which then serves as support for the further synthesis of Pd, Au and PdAu nanoparticles from respective precursor salts. Surface-bound cellular components and exopolysaccharides not only function as shape-directing agent to convert some Fe3O4 nanoparticles to nanorods, but also participate in the formation of PdAu alloy nanoparticles on magnetite. All these three kinds of magnetic nanocomposites can catalyze the reduction of 4-nitrophenol and some other nitroaromatic compounds by NaBH4. PdAu/Fe3O4 demonstrates higher catalytic activity than Pd/Fe3O4 and Au/Fe3O4. Moreover, the magnetic nanocomposites can be easily recovered through magnetic decantation after catalysis reaction. PdAu/Fe3O4 can be reused in at least eight successive cycles of 4-nitrophenol reduction. The biosynthesis approach presented here does not require harmful agents or rigorous conditions and thus provides facile and environmentally benign choice for the preparation of magnetic noble metal nanocatalysts.

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Section: Discussionmentioning

confidence: 99%

Microbial synthesis of Pd/Fe3O4, Au/Fe3O4 and PdAu/Fe3O4 nanocomposites for catalytic reduction of nitroaromatic compounds

Tuo

Liu

Dong

et al. 2015

Sci Rep

116

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“…sample S5, related to the electron peaks for Fe 2p in Fe 3 O 4 54,55. No shakeup satellite peaks related to…”

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confidence: 99%

Growth Mechanism and Electrical and Magnetic Properties of Ag–Fe₃O₄ Core–Shell Nanowires

Wang

Zhan

2015

ACS Appl. Mater. Interfaces

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One-dimensional Ag-Fe3O4 core-shell heteronanowires have been synthesized by a facile and effective coprecipitation method, in which silver nanowires (AgNWs) were used as the nucleation site for growth of Fe3O4 in aqueous solution. The size and morphology control of the core-shell nanowires were achieved by simple adjustments of reaction conditions including FeCl3/FeCl2 concentration, poly(vinylpyrrolidone) (PVP) concentration, reaction temperature, and time. It was found that the Fe3O4 shell thickness could be tuned from 6 to 76 nm with the morphology variation between nanopheres and nanorods. A possible growth mechanism of Ag-Fe3O4 core-shell nanowires was proposed. First, the C═O derived from PVP on the surface of AgNWs provided nucleation points and in situ oxidation reaction between AgNWs and FeCl3/FeCl2 solution promoted the accumulation of Fe(3+) and Fe(2+) on the AgNWs surface. Second, Fe3O4 nanoparticles nucleated on the AgNWs surface. Lastly, Fe3O4 nanoparticles grew on the AgNWs surface by using up the reagents. Higher FeCl3/FeCl2 concentration or higher temperature led to faster nucleation and growth, resulting in the formation of Fe3O4 nanorods, whereas lower concentration or lower temperature resulted in slower nucleation and growth, leading to the formation of Fe3O4 nanospheres. Furthermore, the Ag-Fe3O4 core-shell nanowires exhibited good electrical properties and ferromagnetic properties at room temperature. Particularly, the magnetic saturation values (Ms) increased from 5.7 to 26.4 emu g(-1) with increasing Fe3O4 shell thickness from 9 to 76 nm. This growth of magnetic nanoparticles on 1D metal nanowires is meaningful from both fundamental and applied perspectives.

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“…OH − ) has been utilized for regulating the uniform size of TiO 2 nanoparticles [46] and the morphology of Fe 3 O 4 nanomaterials. [47] However, in our case, all the species of OH − , NH 4 + , and CO 3 2− from urea enzymolysis participate in the formation of NH 4 Ga(OH) 2 CO 3 nanotubes. The formation mechanism of NH 4 Ga(OH) 2 CO 3 nanotubes is proposed, and the advantage of Ga 2 O 3 nanotubes over nanoparticles is demonstrated by the enhanced catalytic H 2 evolution from water-splitting.…”

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confidence: 53%

Porous Ga₂O₃ Nanotubes Derived from Urease‐Mediated Interfacially‐Grown NH₄Ga(OH)₂CO₃ for High‐Efficient Hydrogen Evolution

Wang

Zhang

et al. 2021

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by the hollow cavity. [11] Accordingly, many strategies for fabrication of nanotubes, such as arc discharge, [12] chemical vapor deposition (CVD), [13][14][15] ball-milling and annealing, [16] laser ablation, [17] molecular beam epitaxy, [18] sol-gel, [19,20] atomic layer deposition, [21][22][23] hydro/solvothermal, [24,25] electrochemical anode, [26,27] and electrospinning, [28][29][30] have been developed. However, in those strategies, the hightemperature and/or templates are usually acquired to get the hollow structure of nanotubes, and thus high energy-and time-consumption but low productivity are inevitable. Consequently, the green methodologies for massive fabrication of nanotubes are imperative to boost their widespread application.Gallium oxide (Ga 2 O 3 ), [31,32] a nearly direct band gap semiconductor, has found wide applications in optoelectronic devices, [33,34] gas-sensors, [35,36] energy storage, [37,38] photocatalysis, [39,40] photoelectrocatalysis, [41] and solar cells. [42] Numerous morphology of Ga 2 O 3 , including bulk, nanoparticles, nanosheets, nanowires, nanorods, and nanobelts, has been made mainly through GaOOH intermediates. [43] Though nanotubes have many advantages as indicated above, only two researches on Ga 2 O 3 nanotubes were reported, one was fabricated by the Au(Si)-templated CVD for high-temperature nanothermometers, [44] the other was prepared by anodization of Ga metal at −10 °C for generation of hydrogen from water. [45] Herein, we report a novel strategy for massive fabrication of porous Ga 2 O 3 nanotubes, processing from the intermediate of NH 4 Ga(OH) 2 CO 3 nanotubes that are interfacially-grown from the urease-mediated decomposition of urea in aqueous solution of gallium salts at 20-50 °C. The enzymolysis of urea by urease rapidly produces plenty of OH − , NH 3 /NH 4 + , and CO 2 /CO 3 2− , and in the presence of Ga 3+ , the NH 4 Ga(OH) 2 CO 3 nanotubes are interfacially grown. The pH change from urea enzymolysis (i.e. OH − ) has been utilized for regulating the uniform size of TiO 2 nanoparticles [46] and the morphology of Fe 3 O 4 nanomaterials. [47] However, in our case, all the species of OH − , NH 4 + , and CO 3 2− from urea enzymolysis participate in the formation of NH 4 Ga(OH) 2 CO 3 nanotubes. The formation mechanism of NH 4 Ga(OH) 2 CO 3 nanotubes is proposed, and the advantage of Ga 2 O 3 nanotubes over nanoparticles is demonstrated by the enhanced catalytic H 2 evolution from water-splitting. The The authors proposed a novel template-free strategy, urease-mediated interfacial growth of NH 4 Ga(OH) 2 CO 3 nanotubes at 20-50 °C, to fabricate the porous Ga 2 O 3 nanotubes. The subtlety of the proposed strategy is all the products from urea enzymolysis are utilized in formation of NH 4 Ga(OH) 2 CO 3 precipitates, and the key for interfacial growth of NH 4 Ga(OH) 2 CO 3 nanotubes is the dynamic match between the rate of CO 2 bubble fusion and NH 4 Ga(OH) 2 CO 3 precipitation. The proposed strategy works well for the doped porous Ga 2 O 3 nanotubes. As a proof-of...

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Green synthesis of Fe₃O₄ nanoparticles with controlled morphologies using urease and their application in dye adsorption

Cited by 37 publications

References 39 publications

Microbial synthesis of Pd/Fe3O4, Au/Fe3O4 and PdAu/Fe3O4 nanocomposites for catalytic reduction of nitroaromatic compounds

Microbial synthesis of Pd/Fe3O4, Au/Fe3O4 and PdAu/Fe3O4 nanocomposites for catalytic reduction of nitroaromatic compounds

Growth Mechanism and Electrical and Magnetic Properties of Ag–Fe₃O₄ Core–Shell Nanowires

Porous Ga₂O₃ Nanotubes Derived from Urease‐Mediated Interfacially‐Grown NH₄Ga(OH)₂CO₃ for High‐Efficient Hydrogen Evolution

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Green synthesis of Fe3O4 nanoparticles with controlled morphologies using urease and their application in dye adsorption

Cited by 37 publications

References 39 publications

Microbial synthesis of Pd/Fe3O4, Au/Fe3O4 and PdAu/Fe3O4 nanocomposites for catalytic reduction of nitroaromatic compounds

Microbial synthesis of Pd/Fe3O4, Au/Fe3O4 and PdAu/Fe3O4 nanocomposites for catalytic reduction of nitroaromatic compounds

Growth Mechanism and Electrical and Magnetic Properties of Ag–Fe3O4 Core–Shell Nanowires

Porous Ga2O3 Nanotubes Derived from Urease‐Mediated Interfacially‐Grown NH4Ga(OH)2CO3 for High‐Efficient Hydrogen Evolution

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Product

Resources

About

Green synthesis of Fe₃O₄ nanoparticles with controlled morphologies using urease and their application in dye adsorption

Growth Mechanism and Electrical and Magnetic Properties of Ag–Fe₃O₄ Core–Shell Nanowires

Porous Ga₂O₃ Nanotubes Derived from Urease‐Mediated Interfacially‐Grown NH₄Ga(OH)₂CO₃ for High‐Efficient Hydrogen Evolution