期刊
JOURNAL OF COLLOID AND INTERFACE SCIENCE
卷 491, 期 -, 页码 246-254出版社
ACADEMIC PRESS INC ELSEVIER SCIENCE
DOI: 10.1016/j.jcis.2016.12.051
关键词
Nanocatalyst; Yolk-shell; Sol-gel; Block copolymer micelles; Template
资金
- Deutsche Forschungsgemeinschaft [STA 324/51-1, HO 5526/1-1]
- Department of Science and Technology, India [SB/S1/PC-016/2013]
- LG Yeonam Foundation
- MEST of Korea through Basic Science Research Program [2013R1A1A2063696]
- National Research Foundation of Korea [2013R1A1A2063696] Funding Source: Korea Institute of Science & Technology Information (KISTI), National Science & Technology Information Service (NTIS)
Catalytically active Au@hollow-SiO2 particles embedded in porous silica support (Au@hollow-SiO2@PSS) were prepared by using spherical micelles from poly(styrene)-block-poly(4-vinyl pyridine) block copolymer as a sacrificial template. Drastic increase of the shell porosity was observed after pyrolytic removal of polymeric template because the stretched poly(4-vinyl pyridine) chains interpenetrating with silica shell acted as an effective porogen. The embedding of Au@hollow-SiO2 particles in porous silica support prevented their fusion during pyrolysis. The catalytic activity of Au@hollow-SiO2@PSS was investigated using a model reaction of catalytic reduction of 4-nitrophenol and reductive degradation of Congo redazo-dye. Significantly, to the best of our knowledge, Au@hollow-SiO2@PSS catalyst shows the highest activity among analogous systems reported till now in literature. Such high activity was attributed to the presence of multiple pores within silica shell of Au@hollow-SiO2 particles and easy accessibility of reagents to the catalytically active sites of the ligand-free gold surface through the porous silica support. (C) 2016 Elsevier Inc. All rights reserved.
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