A mild synthetic route to Fe3O4@TiO2-Au composites: preparation, characterization and photocatalytic activity

Ma, Jianqi; Guo, Sheng; Guo, Xiaohua; Ge, Hongguang

doi:10.1016/j.apsusc.2015.07.040

Cited by 61 publications

(20 citation statements)

References 46 publications

(48 reference statements)

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“…On the other hand, caused by the surface plasmon resonance effect, Ag nanoparticles are easily excited in the condition of being exposed to Visible light, which produces the large number of electrons on the surface. These electrons are transferred to the CB to enhance the absorbance value of TiO 2 in the Visible region [55,56]. During the photocatalytic process, the electrons accumulated on the TiO 2 react with the oxygen molecules existed on the surface or dissolved in the water, and are reduced to the activated superoxide anion radical∙O 2 − , which can remove organic pollutants or further generate oxides through a series of reactions with H + .…”

Section: Resultsmentioning

confidence: 99%

One-Step Synthesis of Ag@TiO2 Nanoparticles for Enhanced Photocatalytic Performance

Zhang

et al. 2018

Nanomaterials

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Polyamide network polymers (PNP) modified TiO2 nanoparticles (NPs) were decorated with Ag NPs in hydrothermal gel method, forming one-step synthesized photocatalysts, Ag@TiO2 NPs. The effect of PNP and the amount of Ag NPs added were investigated in this work. PNP acted as a nanocage to prevent TiO2 aggregation and capture Ag accurately, which could effectively control product sizes and improve dispersibility in solvents. Simultaneously, TiO2 NPs modified with Ag NPs exhibited remarkable photocatalytic effects. One-step synthesis simplified the experimental process and avoided the agglomeration of silver ions during the secondary reaction, achieving the purpose of uniform distribution at a specific location of TiO2 NPs. The prepared Ag@TiO2 NPs-0.5 could remove 79.49% of Methyl Orange (MO) after 3 h of ultraviolet light irradiation, which was 2.7 times higher than the reaction rate of pure TiO2 NPs. It also exhibited good photoactivity under Visible light conditions. Moreover, the mineralization rate of MO over the Ag@TiO2 NPs-0.5 could be up to 72.32% under UV light and 47.08% under Visible light irradiation, which revealed that the prepared catalysts could effectively degrade most of the MO to CO2 and H2O. The samples also demonstrated the excellent stability and easy recyclability with over 90% of the original catalytic level for MO degradation. The photocatalysts studied also exerted broad application prospects such as photovoltaic hydrogen production, electronic sensors and biomedicine.

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Section: Resultsmentioning

confidence: 99%

One-Step Synthesis of Ag@TiO2 Nanoparticles for Enhanced Photocatalytic Performance

Zhang

et al. 2018

Nanomaterials

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“…Conversely, pure TiO 2NWS did not provide distinct transfer paths for electrons, causing easy recombination of electrons and holes. Furthermore, the electrons in the CB can transfer from TiO 2NWS to Au NPS , resulting from a Schottky barrier being formed at the metal-semiconductor interface [ 49 ]. It may be lead to the photo-induced electrons being trapped by Au NPS under UV irradiation, and electrons could reduce O 2 in TiO 2 to O 2 − anion radicals.…”

Section: Resultsmentioning

confidence: 99%

Synthesis of TiO2NWS@AuNPS Composite Catalyst for Methylene Blue Removal

Wang

et al. 2018

Materials

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In this article, HBP-NH2-modified titania nanowire (TiO2NWS)-decorated Au nanoparticles (TiO2NWS@AuNPS) were synthesized by one-step method. The role of HBP-NH2 concentration in the formation of TiO2NWS was investigated. The fineness and uniformity of pure TiO2NWS were enhanced by absorbed amino groups from amino-terminated hyperbranched polymer (HBP-NH2). The morphology and crystal structure of TiO2NWS and TiO2NWS@AuNPS were examined by transmission electron microscopy (TEM), X-ray diffraction (XRD), and Fournier transform infrared (FTIR) spectroscopy. The chemical states of gold, titanium and oxygen were analyzed by X-ray photoelectron spectroscopy (XPS). The results showed that at the concentration of HBP-NH2 100 g/L, the mean diameter of TiO2NWS was nearly 72 nm and Au nanoparticles were uniformly distributed on the surface of TiO2NWS. The presence of AuNPS improved the photocatalytic properties of TiO2NWS under UV light irradiation. The Au load was believed to improve the utilization rate of the photoelectron and activated the adsorbed oxygen. The obtained TiO2NWS@AuNPS decomposed 99.6% methylene blue (MB) after 300 min when subjected to UV light irradiation. After five cycles of the catalyzing process, the TiO2NWS@AuNPS still retained over 90% of its catalytic ability for MB. The Au deposition was found responsible for the high catalytic activity of TiO2NWS@AuNPS.

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“…In the recent years, magnetic nanoparticles (MNPs) have been employed in various scientific fields including catalysis, 1, 2 semiconductors, 3 sensors, 4 pigments, wastewater treatments, 5, 6 adsorbents, 7 magnetic resonance imaging, 8 magnetic data storage devices, 9 bio‐separations 10 and medicines 11, 12 . Recently, some MNPs have been used as highly useful supports for immobilization of homogeneous catalysts in order to obtain heterogeneous catalysts and enable them to be recovered using an external magnet 13–15 .…”

Section: Introductionmentioning

confidence: 99%

3‐Amino‐5‐mercapto‐1,2,4‐triazole‐functionalized Fe₃O₄ magnetic nanocomposite as a green and efficient catalyst for synthesis of bis(indolyl)methane derivatives

Hajibabaei

Abdoli‐Senejani

Shafiei

2020

Applied Organom Chemis

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A core–shell Fe3O4@silica magnetic nanocomposite functionalized with 3‐amino‐5‐mercapto‐1,2,4‐triazole (Fe3O4/SiO2/PTS/AMTA) was prepared using Fe3O4 with silica layer, and its surface was modified with 3‐amino‐5‐mercapto‐1,2,4‐triazole. The novel synthesized magnetite nanocomposite was characterized using various techniques. The catalytic activity of Fe3O4/SiO2/PTS/AMTA was demonstrated in the synthesis of bis(indolyl)methane derivatives under solvent‐free conditions. Some of the bis(indolyl)methane derivatives were synthesized through one‐pot, three‐component reaction of 1 mol of various benzaldehydes or ketones with 2 mol of indole in the presence of Fe3O4/SiO2/PTS/AMTA in good to excellent isolated yields. In addition, the catalyst could be recovered and used for several reaction runs without loss of catalytic activity. The stability of recycled catalyst was investigated. This method has some advantages including experimental simplicity, good to excellent yields, solvent‐free conditions and stability and reusability of the catalyst.

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A mild synthetic route to Fe3O4@TiO2-Au composites: preparation, characterization and photocatalytic activity

Cited by 61 publications

References 46 publications

One-Step Synthesis of Ag@TiO2 Nanoparticles for Enhanced Photocatalytic Performance

One-Step Synthesis of Ag@TiO2 Nanoparticles for Enhanced Photocatalytic Performance

Synthesis of TiO2NWS@AuNPS Composite Catalyst for Methylene Blue Removal

3‐Amino‐5‐mercapto‐1,2,4‐triazole‐functionalized Fe₃O₄ magnetic nanocomposite as a green and efficient catalyst for synthesis of bis(indolyl)methane derivatives

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A mild synthetic route to Fe3O4@TiO2-Au composites: preparation, characterization and photocatalytic activity

Cited by 61 publications

References 46 publications

One-Step Synthesis of Ag@TiO2 Nanoparticles for Enhanced Photocatalytic Performance

One-Step Synthesis of Ag@TiO2 Nanoparticles for Enhanced Photocatalytic Performance

Synthesis of TiO2NWS@AuNPS Composite Catalyst for Methylene Blue Removal

3‐Amino‐5‐mercapto‐1,2,4‐triazole‐functionalized Fe3O4 magnetic nanocomposite as a green and efficient catalyst for synthesis of bis(indolyl)methane derivatives

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3‐Amino‐5‐mercapto‐1,2,4‐triazole‐functionalized Fe₃O₄ magnetic nanocomposite as a green and efficient catalyst for synthesis of bis(indolyl)methane derivatives