Photocatalytic properties of Au/Fe 2 O 3 nano-composites prepared by co-precipitation

Mishra, Maneesha; Park, Hani; Chun, Doo‐Man

doi:10.1016/j.apt.2015.11.009

Cited by 22 publications

(12 citation statements)

References 63 publications

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“…Performing processes in presented way reflects the rules of green chemistry and cleaner technologies. Similar studies were performed by Mishra et al [37]. They obtained nanoAu/Fe 2 O 3 composite based on co-precipitation method.…”

Section: Discussionsupporting

confidence: 75%

Microwave and UV Assisted Methods for Obtaining Novel Composites Based on Fe2O3 with Embedded Gold Nanoparticles

2017

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Metallic nanoparticles embedded into the structure of metal oxides may play a role of catalytic substances. Such composites are mostly applied in oxidation reactions. The paper presents two one-step-methods for obtaining nanocomposites of gold embedded in the structure of iron oxide matrices (nanoAu/Fe 2 O 3 ). Gold nanoparticles were formed in situ in the process of iron hydroxide dehydration. Thanks to the use of tannic acid it was possible to effectively reduce gold ions and stabilize the forming metal nanoparticles. The composites were prepared in the fields of microwave, ultraviolet radiation. The physicochemical properties of products were determined by scanning electron microscopy, energy-dispersive X-ray spectroscopy, Fourier transform infrared spectroscopy, X-ray analysis and high-resolution transmission electron microscopy technique with EDS and elemental mapping mode. Also, the catalytic activity of the nanocomposites obtained was evaluated based on the process of methyl orange degradation. It was observed that products obtained according to the microwave radiation method are characterized by improved applying properties.

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Section: Discussionsupporting

confidence: 75%

Microwave and UV Assisted Methods for Obtaining Novel Composites Based on Fe2O3 with Embedded Gold Nanoparticles

2017

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“…Figure 5 shows the FTIR spectra of α-Fe 2 O 3 and Au/α-Fe 2 O 3 calcined at 300 °C for 2 h. The obviously broad peak at about 3420 cm −1 was attributed to the O–H stretching vibration of absorbed water and the shoulder peak at 1630 cm −1 was ascribed to the H–OH bending vibration of absorbed water [29,30]. The two sharp peaks at 460 cm −1 and 530 cm −1 were mainly due to the Fe–O vibration of α-Fe 2 O 3 [31,32]. The FTIR spectra of gold catalysts were similar with that of support, indicating the addition of gold has a little effect on the bond of hematite.…”

Section: Resultsmentioning

confidence: 99%

Improved Catalytic Performance of Au/α-Fe2O3-Like-Worm Catalyst for Low Temperature CO Oxidation

Han¹,

Zhang²,

Guo³

et al. 2019

Nanomaterials

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The gold catalysts supported on various morphologies of α-Fe2O3 in carbon monoxide (CO) oxidation reaction have been studied for many researchers. However, how to improve the catalytic activity and thermal stability for CO oxidation is still important. In this work, an unusual morphology of α-Fe2O3 was prepared by hydrothermal method and gold nanoparticles were supported using a deposition-precipitation method. Au/α-Fe2O3 catalyst exhibited great activity for CO oxidation. The crystal structure and microstructure images of α-Fe2O3 were carried out by X-ray diffraction (XRD) and scanning electron microscopy (SEM) and the size of gold nanoparticles was determined by transmission electron microscopy (TEM). X-ray photoelectron spectra (XPS) and Fourier transform infrared spectra (FTIR) results confirmed that the state of gold was metallic. The 1.86% Au/α-Fe2O3 catalyst calcined at 300 °C had the best catalytic performance for CO oxidation reaction and the mechanism for CO oxidation reaction was also discussed. It is highly likely that the small size of gold nanoparticle, oxygen vacancies and active sites played the decisive roles in CO oxidation reaction.

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“…The method is still widely applied (Sreethawong et al, 2011; Liu R. et al, 2013; Tran Thi Minh et al, 2013; Wang H. et al, 2013; He et al, 2016; Ilieva et al, 2016; Liu et al, 2016; Mishra et al, 2016; Li et al, 2018; Patil et al, 2018). It consists on having an aqueous solution of HAuCl 4 and water-soluble metal salts, such as a nitrate, being poured into an aqueous alkaline solution (Na 2 CO 3 and/or NH 4 OH) and stirred for a few minutes.…”

Section: Gold Catalyst Preparation Methodsmentioning

confidence: 99%

Supported Gold Nanoparticles as Catalysts for the Oxidation of Alcohols and Alkanes

Carabineiro

2019

Front. Chem.

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Supporting gold nanoparticles have shown to be extremely active for many industrially important reactions, including oxidations. Two representative examples are the oxidation of alcohols and alkanes, that are substrates of industrial interest, but whose oxidation is still challenging. This review deals with these reactions, giving an insight of the first studies performed by gold based catalysts in these reactions and the most recent developments in the field.

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Photocatalytic properties of Au/Fe 2 O 3 nano-composites prepared by co-precipitation

Cited by 22 publications

References 63 publications

Microwave and UV Assisted Methods for Obtaining Novel Composites Based on Fe2O3 with Embedded Gold Nanoparticles

Microwave and UV Assisted Methods for Obtaining Novel Composites Based on Fe2O3 with Embedded Gold Nanoparticles

Improved Catalytic Performance of Au/α-Fe2O3-Like-Worm Catalyst for Low Temperature CO Oxidation

Supported Gold Nanoparticles as Catalysts for the Oxidation of Alcohols and Alkanes

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