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首页> 外文期刊>RSC Advances >Synthesis and characterization of a multifunctional nanocatalyst based on a novel type of binary-metal-oxide-coated Fe3O4–Au nanoparticle
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Synthesis and characterization of a multifunctional nanocatalyst based on a novel type of binary-metal-oxide-coated Fe3O4–Au nanoparticle

机译：基于新型二元金属氧化物涂层Fe3O4-Au纳米粒子的多功能纳米催化剂的合成与表征

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A novel type of binary-metal-oxide-coated Au nanocatalyst, including a mixed oxide layer, a moveable magnetic Fe _(3) O _(4) core and some Au NPs of 2–5 nm, has been synthesized successfully by a facile hydrothermal synthesis method. SEM, TEM, EDX, FTIR, XRD, and TGA were employed to characterize the prepared samples. The results showed the mSiO _(2) –TiO _(2) layer could increase the thermal stability and reactivity of metal nanocatalysts compared to a pure TiO _(2) or SiO _(2) layer. The reduction of 4-nitrophenol (4-NP) to 4-aminophenol (4-AP) was employed as a model reaction to test catalytic performance in this work. The results showed that the binary-metal-oxide-coated nanocatalyst (550 °C) exhibited significantly enhanced catalytic performance compared with the pure SiO _(2) (550 °C) or TiO _(2) (550 °C). In particular, the mSiO _(2) –TiO _(2) /Au/C/Fe _(3) O _(4) particles calcined at 550 °C showed the highest catalytic activity, compared to the samples calcined at 700 °C, 300 °C and RT. Meanwhile, because of C layer burning, the sample presented a few white spots between the Fe _(3) O _(4) microsphere and the oxide layer, suggesting that the specific surface area was increased by calcination. The sample (550 °C) still has a certain degree of magnetism, suggesting the desired samples could be separated by magnet. Finally, to explain the reduction of 4-nitrophenol (4-NP) to 4-aminophenol (4-AP), a possible reaction mechanism was also proposed.
机译：一种新型的二元金属氧化物涂覆的Au纳米催化剂，包括混合氧化物层，可移动的磁FE _（3）O _（4）核和2-5nm的一些Au NM，由A合成容易水热合成方法。使用SEM，TEM，EDX，FTIR，XRD和TGA来表征制备的样品。结果表明，与纯TiO _（2）或SiO_（2）层相比，MSIO _（2）-TiO _（2）层可以提高金属纳米催化剂的热稳定性和反应性。使用4-硝基苯酚（4-NP）至4-氨基苯酚（4-AP）作为模型反应，以测试该工作中的催化性能。结果表明，与纯SiO_（2）（550℃）或TiO _（2）（550℃）相比，二元金属氧化物涂覆的纳米催化剂（550℃）显示出显着增强的催化性能。特别地，在550℃下煅烧的MSIO _（2）-TiO _（2）/ Au / C / C / C / C / C / C / C / FE _（3）O _（4）颗粒显示出最高的催化活性，与700°煅烧的样品相比C，300°C和Rt。同时，由于C层燃烧，样品在Fe _（3）O _（4）微球和氧化物层之间呈现几个白色斑点，表明通过煅烧增加了比表面积。样品（550℃）仍然具有一定程度的磁性，表明所需的样品可以用磁体分离。最后，为了解释4-硝基苯酚（4-NP）至4-氨基酚（4-AP）的还原，还提出了一种可能的反应机理。

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