Magnetically separable titania-coated nickel ferrite photocatalyst

A magnetically separable photocatalyst was prepared by a continuous multi-step spray pyrolysis process. In the first step, nickel ferrite core particles were prepared by an ultrasonic spray pyrolysis. In the second step, tetraethyl orthosilicate (TEOS) and titanium isopropoxide (TTIP) were sequentially injected and coated on the surface of the core particles. The sequentially coated layers were decomposed to form silica and titania layers in a final furnace reactor. The titania-silica layered particles displayed higher photoactivity than particles coated only with titania and titania-silica mixture-coated particles. The photoactivity of the titania-silica layered particles remained unchanged after magnetic separation and washing. This confirms that the adhesion between the core particles and the coated layer is strong enough to withstand vigorous mixing. It also implies that the formation of free particles of silica or titania is negligible in the second reactor. The strong adhesion between the coated layer and the nickel ferrite core is attributed to the features of the multi-step process, wherein the core particles are exposed to high temperate in the second reactor for only a few seconds and transformation of the core particles into non-magnetic particles is prohibited. (C) 2004 Elsevier B.V. All rights reserved.
Publisher
ELSEVIER SCIENCE SA
Issue Date
2004-08
Language
ENG
Keywords

TIO2-BASED PHOTOCATALYSTS; PARTICLE-SIZE; TIO2; WATER; DEGRADATION; PHASE; TEMPERATURE; POLLUTANTS; COATINGS; SYSTEM

Citation

MATERIALS CHEMISTRY AND PHYSICS, v.86, no.2-3, pp.375 - 381

ISSN
0254-0584
DOI
10.1016/j.matchemphys.2004.03.027
URI
http://hdl.handle.net/10203/9590
Appears in Collection
CBE-Journal Papers(저널논문)
  • Hit : 214
  • Download : 9
  • Cited 0 times in thomson ci
This item is cited by other documents in WoS
⊙ Detail Information in WoSⓡClick to seewebofscience_button
⊙ Cited 107 items in WoSClick to see citing articles inrecords_button

qr_code

  • mendeley

    citeulike


rss_1.0 rss_2.0 atom_1.0