SiO2介导的5 nm金颗粒的高效富集及其催化活性研究

doi:10.6023/A19120445

化学学报 ›› 2020, Vol. 78 ›› Issue (2): 170-176.DOI: 10.6023/A19120445 上一篇

研究论文

SiO₂介导的5 nm金颗粒的高效富集及其催化活性研究

李威^a,d, 冉铁成^c, 张瑜^a,b, 何威^a,d, 马继飞^a, 汪启胜^b, 张继超^a,b, 诸颖^a,b

a 中国科学院上海应用物理研究所物理生物学研究室上海同步辐射光源生物成像中心中国科学院界面物理与技术重点实验室上海 201800;
b 张江实验室上海高等研究院中国科学院上海 201210;
c 武汉中原瑞德生物制品有限责任公司研发部武汉 430206;
d 中国科学院大学北京 100049

投稿日期:2019-12-12 发布日期:2020-02-17
通讯作者: 张继超 E-mail:zjchao@sinap.ac.cn
基金资助:
项目受国家自然科学基金（Nos.11705270，11675251，21390414）、上海市青年科技英才扬帆计划（No.17YF1423600）、中国博士后科学基金（Nos.2018M632189，2018M640340）和中国科学院青年创新促进会（Nos.2012205，2016236）资助.

SiO₂-Mediated High-efficiency Enrichment of 5 nm Gold Nanoparticles and Their Catalytic Activity

Li Wei^a,d, Ran Tiecheng^c, Zhang Yu^a,b, He Wei^a,d, Ma Jifei^a, Wang Qisheng^b, Zhang Jichao^a,b, Zhu Ying^a,b

a Shanghai Institute of Applied Physics, Division of Physical Biology, Shanghai Synchrotron Radiation Facility Bioimaging Center, CAS Key Laboratory of Interfacial Physics and Technology, Shanghai 201800;
b Zhangjiang Laboratory, Shanghai Advanced Research Institute, Chinese Academy of Sciences, Shanghai 201210;
c Wuhan Zhongyuan Ruide Biological Products Corporation Limited R&D, Wuhan 430206;
d University of Chinese Academy of Sciences, Beijing 100049

Received:2019-12-12 Published:2020-02-17
Supported by:
Project supported by the National Natural Science Foundation of China (Nos. 11705270, 11675251, 21390414), the Shanghai Sailing Program (No. 17YF1423600), the China Postdoctoral Science Foundation (Nos. 2018M632189, 2018M640340) and the Youth Innovation Promotion Association of CAS (Nos. 2012205, 2016236).

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摘要/Abstract

粒径小于10 nm的金纳米颗粒（Au NPs）具有高的表面积与体积比，因此具有极强的催化活性，在催化领域应用广泛.传统湿法合成的金纳米颗粒浓度过低，需要进一步富集才能满足实验要求.然而，小粒径Au NPs在浓缩过程中容易聚集，失去催化活性.在保持催化活性的同时，浓缩小粒径的AuNPs是一个挑战.本工作用500 nm硅烷化修饰的SiO₂颗粒，通过静电相互作用吸附5 nm Au NPs，在室温下自组装形成Au NPs@SiO₂复合物.Au NPs的负载效率可达99.5%，每个SiO₂上负载的Au NPs高达800～1000个，大大提高了Au NPs有效浓度，并且富集到SiO₂表面的Au NPs不会团聚.催化活性研究结果显示，制备得到的Au NPs@SiO₂的催化活性是同浓度Au NPs的3倍.该复合物颗粒重复使用5次后，催化转换效率仍能保持在80%左右.该复合物颗粒能稳定保存一个月，结构和催化活性不变.并且，通过调节Au NPs在SiO₂表面的组装密度，可精确调控Au NPs@SiO₂催化活性.本工作提供了一种制备高浓度小粒径Au NPs的简单方法，并大大提高了Au NPs催化活性，该方法在富集其它小粒径纳米颗粒中具有广泛应用.

关键词: 金纳米颗粒, 催化活性, 富集, 静电相互作用

Gold nanoparticles (Au NPs), smaller than 10 nm, have a high ratio of surface area to volume, and therefore have excellent catalytic activity. They are widely used in the field of catalysis. The concentration of small particle sized Au NPs synthesized by traditional wet chemical method is too low, and further enrichment is needed in order to meet the experimental requirements. However, small particle sized Au NPs are prone to aggregate during the concentration process and lose the catalytic activity. It is a challenge to concentrate the small Au NPs while keeping their catalytic activities. In this work, 500 nm silanized SiO₂ particles which are covered by positive charges were used to adsorb 5 nm Au NPs through electrostatic interaction, and self-assemble to form Au NPs@SiO₂ composite at room temperature. The loaded efficiency of Au NPs can reach 99.5% and the amount of Au NPs particles loaded on each SiO₂ particle reached 800~1000, which greatly increased the effective concentration of Au NPs in the local area. Moreover, Au NPs enriched on the surface of SiO₂ were bound by electrostatic action and uniformly distributed on the surface of SiO₂ without agglomeration. The results showed that the catalytic activity of AuNPs@SiO₂ was greatly enhanced by increasing the local concentration of AuNPs, and the catalytic activity was 3 times higher than that of AuNPs at the same concentration. After 5 times of reuse, the catalytic conversion efficiency remained at about 80%. The Au NPs@SiO₂ composite could be preserved for one month with the same structure and catalytic activity. Moreover, by adjusting the molar ratio of SiO₂ and Au NPs, the assembly density of Au NPs at SiO₂ can be precisely regulated, and the catalytic activity of Au NPs@SiO₂ can also be changed precisely. This work provides a simple method for preparing small sized Au NPs with high concentration and greatly improves the catalytic activity of Au NPs. The method has wide application in enriching other small sized nanoparticles.

Key words: gold nanoparticles, catalytic activity, enrichment, the electrostatic interaction

引用此文

李威, 冉铁成, 张瑜, 何威, 马继飞, 汪启胜, 张继超, 诸颖. SiO₂介导的5 nm金颗粒的高效富集及其催化活性研究[J]. 化学学报, 2020, 78(2): 170-176.

Li Wei, Ran Tiecheng, Zhang Yu, He Wei, Ma Jifei, Wang Qisheng, Zhang Jichao, Zhu Ying. SiO₂-Mediated High-efficiency Enrichment of 5 nm Gold Nanoparticles and Their Catalytic Activity[J]. Acta Chimica Sinica, 2020, 78(2): 170-176.

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SiO₂介导的5 nm金颗粒的高效富集及其催化活性研究

SiO₂-Mediated High-efficiency Enrichment of 5 nm Gold Nanoparticles and Their Catalytic Activity

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