Silica-supported Au@hollow-SiO2 particles with outstanding catalytic activity prepared via block copolymer template approach

被引：28

作者：

Shajkumar, Aruni ^{[1
]}

Nandan, Bhanu ^{[2
]}

Sanwaria, Sunita ^{[2
]}

Albrecht, Victoria ^{[1
]}

Libera, Marcin ^{[3
]}

Lee, Myong-Hoon ^{[4
]}

Auffermann, Gudrun ^{[5
]}

Stamm, Manfred ^{[1
,6
]}

Horechyy, Andriy ^{[1
]}

机构：

[1] Leibniz Inst Polymer Res Dresden, Hohe Str 6, D-01069 Dresden, Germany

[2] Indian Inst Technol Delhi, Dept Text Technol, New Delhi 110016, India

[3] Polish Acad Sci, Ctr Polymer & Carbon Mat, M Curie Sklodowskej 34, PL-41819 Zabrze, Poland

[4] Chonbuk Natl Univ, Ctr Polymer Fus Technol, Grad Sch Flexible & Printable Elect, Jeonju 561756, South Korea

[5] Max Planck Inst Chem Phys Fester Stoffe, Nothnitzer Str 40, D-01187 Dresden, Germany

[6] Tech Univ Dresden, Phys Chem Polymer Mat, D-01062 Dresden, Germany

来源：

JOURNAL OF COLLOID AND INTERFACE SCIENCE | 2017年 / 491卷

关键词：

Nanocatalyst; Yolk-shell; Sol-gel; Block copolymer micelles; Template; TRANSITION-METAL NANOPARTICLES; HAIRY POLYMER NANOFIBERS; YOLK-SHELL NANOPARTICLES; GOLD NANOPARTICLES; AU NANOPARTICLES; HOLLOW SILICA; AG NANOCATALYST; GRAPHENE OXIDE; REDUCTION; DEGRADATION;

D O I：

10.1016/j.jcis.2016.12.051

中图分类号：

O64 [物理化学（理论化学）、化学物理学];

学科分类号：

070304 ; 081704 ;

摘要：

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.

引用

页码：246 / 254

页数：9

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