Porous TiO2 hollow spheres by liquid phase deposition on polystyrene latex-stabilised Pickering emulsions

被引:93
作者
Strohm, H [1 ]
Löbmann, P [1 ]
机构
[1] Univ Wurzburg, Lehrstuhl Silicatchem, D-97070 Wurzburg, Germany
关键词
D O I
10.1039/b406842d
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
Hollow TiO2-composite spheres in the size range of 50 - 150 mum were prepared by liquid phase deposition on template assemblies of self-organised PS latex particles. These assemblies spontaneously formed on the surface of octanol droplets in an oil-in-water emulsion, the overall process resembling the stages of natural biomineralisation. The TiO2-polymer composite capsules were converted into highly porous inorganic spheres by dissolution of the PS template particles and calcination at various temperatures. Removal of the organic template was monitored by DTA/TGA and He-pycnometry. The microstructure of the TiO2 films was characterised by nitrogen sorption and XRD measurements. The calcination temperature dependence of the photocatalytic activity of the hollow spheres was assessed by UV induced degradation of DCA. High photocatalytic activity was observed after calcination at 200 degreesC due to a high specific surface area of the film and the formation of micropores and mesopores in the size range <4 nm. Calcination at higher temperatures leads to the formation of larger mesopores and a drop in the photocatalytic activity due to a decrease in specific surface area and the disappearance of pores <4 nm. A major fraction of the deposited film consists of crystalline TiO2 in anatase modification. Further crystallisation and crystal growth at higher calcination temperatures has only minor influence on the photocatalytic activity.
引用
收藏
页码:2667 / 2673
页数:7
相关论文
共 39 条
[1]   Synthesis of mesoscopic hollow spheres and inner surface functionalized hollow spheres of titanium dioxide by the liquid phase deposition method [J].
Aoi, Y ;
Kambayashi, H ;
Kamijo, E ;
Deki, S .
JOURNAL OF MATERIALS RESEARCH, 2003, 18 (12) :2832-2836
[2]   Photodestruction of dichloroacetic acid catalyzed by nano-sized TiO2 particles [J].
Bahnemanna, DW ;
Kholuiskaya, SN ;
Dillert, R ;
Kulak, AI ;
Kokorin, AI .
APPLIED CATALYSIS B-ENVIRONMENTAL, 2002, 36 (02) :161-169
[3]  
Bamnolker H, 1996, J POLYM SCI POL CHEM, V34, P1857
[4]   Grain boundary scars and spherical crystallography [J].
Bausch, AR ;
Bowick, MJ ;
Cacciuto, A ;
Dinsmore, AD ;
Hsu, MF ;
Nelson, DR ;
Nikolaides, MG ;
Travesset, A ;
Weitz, DA .
SCIENCE, 2003, 299 (5613) :1716-1718
[5]   Solid wettability from surface energy components: Relevance to pickering emulsions [J].
Binks, BP ;
Clint, JH .
LANGMUIR, 2002, 18 (04) :1270-1273
[6]   Production of hollow microspheres from nanostructured composite particles [J].
Caruso, F ;
Caruso, RA ;
Möhwald, H .
CHEMISTRY OF MATERIALS, 1999, 11 (11) :3309-3314
[7]   Investigation of electrostatic interactions in polyelectrolyte multilayer films:: Binding of anionic fluorescent probes to layers assembled onto colloids [J].
Caruso, F ;
Lichtenfeld, H ;
Donath, E ;
Möhwald, H .
MACROMOLECULES, 1999, 32 (07) :2317-2328
[8]   Electrostatic self-assembly of silica nanoparticle -: Polyelectrolyte multilayers on polystyrene latex particles [J].
Caruso, F ;
Lichtenfeld, H ;
Giersig, M ;
Möhwald, H .
JOURNAL OF THE AMERICAN CHEMICAL SOCIETY, 1998, 120 (33) :8523-8524
[9]   Nanoengineering of inorganic and hybrid hollow spheres by colloidal templating [J].
Caruso, F ;
Caruso, RA ;
Möhwald, H .
SCIENCE, 1998, 282 (5391) :1111-1114
[10]   Multilayered titania, silica, and Laponite nanoparticle coatings on polystyrene colloidal templates and resulting inorganic hollow spheres [J].
Caruso, RA ;
Susha, A ;
Caruso, F .
CHEMISTRY OF MATERIALS, 2001, 13 (02) :400-409