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精准智能化学全国重点实验室,中国科学技术大学高分子科学与工程系,合肥 230026
Received:03 April 2025,
Accepted:03 June 2025,
Published Online:29 July 2025,
Published:20 September 2025
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LI Yi-shao, SHEN Xiang-yu, ZHANG Shou-qun, ZHANG Song, WANG Mo-zhen, GE Xue-wu. Preparation and Catalytic Performance of Metal/Silica Nanosphere Catalysts[J]. Polymer bulletin, 2025, 38(9): 1385-1396.
LI Yi-shao, SHEN Xiang-yu, ZHANG Shou-qun, ZHANG Song, WANG Mo-zhen, GE Xue-wu. Preparation and Catalytic Performance of Metal/Silica Nanosphere Catalysts[J]. Polymer bulletin, 2025, 38(9): 1385-1396. DOI: 10.14028/j.cnki.1003-3726.2025.25.101.
高性能纳米金属催化剂的开发与能源转换和存储、环境保护以及工业应用的发展密切相关。本工作采用Stöber法制备了粒径为60 nm的单分散二
氧化硅纳米球,随后用
γ
-缩水甘油醚氧丙基三甲氧基硅烷(KH560)对其进行改性,制备了一系列不同环氧基(EO)含量的改性二氧化硅纳米球(SiO
2
-EO)。进一步利用EO与Ag
+
离子的相互作用以及Ag
+
离子与乙醇的氧化还原反应,成功制备了表面均匀且稳定负载着6 nm银纳米粒子的二氧化硅(Ag/SiO
2
-EO)纳米球催化剂。研究了SiO
2
-EO纳米球上的EO含量与Ag/SiO
2
-EO复合纳米球的形貌和银负载量之间的关系,证明了EO比Si―OH更易与Ag
+
离子结合,这使得EO修饰的二氧化硅纳米球成为银纳米粒子的优良载体。并且载体纳米球上的EO含量决定了银纳米粒子的饱和负载量,因此通过精准调控EO和Ag
+
离子的相对数量,可以实现对银纳米粒子的精准高效负载。将Ag/SiO
2
-EO复合纳米球用于催化NaBH
4
还原亚甲基蓝(MB)的模型反应,结果表明所制备的复合纳米催化剂具有良好的催化活性和循环使用性。本工作不仅为纳米二氧化硅载体的环氧基功能化以及原位精准负载金属纳米粒子提供了理论和实践参考,还拓展了纳米二氧化硅载体的应用领域,为开发新型纳米金属催化体系和高性能环氧树脂复合材料提供了新思路。
The development of high-performance nanometal catalysts is closely related to the development of energy conversion and storage
environmental protection
and industrial applications. In this work
monodisperse silica nanospheres with a particle size of 60 nm were precisely prepared by Stöber method
followed by the surface modification with 3-glycidoxypropyltrimethoxysilane (KH560) to obtain a series of epoxy (EO)-functionalized silica nanospheres (SiO
2
-EO) with different EO content. Based on the interaction between Ag
+
ions and EO groups and the redox reaction between EO and ethanol
silver nanoparticles with a size of 6 nm were uniformly and stably loaded on the SiO
2
-EO nanosphere carriers
resulting in the successful preparation of the novel Ag/SiO
2
-EO composite nanosphere catalyst. The dependence of the morphology and loading capacity of silver nanoparticles on Ag/SiO
2
-EO on the EO content of the SiO
2
-EO nanosphere carrier was studied. The result shows that EO has a stronger affinity toward Ag
+
ions than Si―OH groups
which makes the epoxy-functionalized silica nanospheres an excellent support for silver nanoparticles. Moreover
the EO content on the carrier nanospheres determines the loading capacity of silver nanoparticles. Therefore
stable and e
fficient loading of silver nanoparticles on SiO
2
-EO nanospheres can be achieved by precise regulation of the relative content of EO and Ag
+
ions. The Ag/SiO
2
-EO composite nanospheres were applied to the model reduction of methylene blue by NaBH
4
. The result shows that the prepared composite nanospheres exhibit excellent catalytic activity and recyclability. This work not only provides theoretical and practical references for the epoxy-functionalized nano-silica carriers and the in-situ precise loading of metal nanoparticles
but also expands the application fields of nano-silica carriers
providing novel strategies for developing advanced nanometal catalytic systems and high-performance epoxy resin composites.
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