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TiO2 Nanoparticles Attached on a Superparamagnetic Iron Oxide Nanocluster Core@Fibrous Silica Shell Nanocomposite as a Magnetically Recoverable Photocatalyst : 초상자성 산화철 나노클러스터 중심@방사형 실리카 피막의 나노복합체에 이산화티타늄 나노입자가 부착된 재사용이 가능한 광촉매에 대한연구
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- Authors
- Advisor
- 박원철
- Major
- 융합과학기술대학원 융합과학부
- Issue Date
- 2017-02
- Publisher
- 서울대학교 대학원
- Keywords
- Fibrous silica nanoparticle ; Photocatalyst ; Core shell ; Dye degradation ; Reusable nanoparticle
- Description
- 학위논문 (석사)-- 서울대학교 대학원 : 융합과학부, 2017. 2. 박원철.
- Abstract
- A magnetically recoverable photocatalyst was prepared by supporting TiO2 nanoparticles on a superparamagnetic iron oxide nanocluster (SION) core@fibrous silica shell (FSS) nanocomposite. Using the raspberry-shaped magnetic iron oxide nanocluster core as a seed, FSS with uniform thickness was grown directly on the core surface by a sol-gel process. The preparation method was optimized to have a single core for each nanoparticle by adjusting the amount of the silica source. The FSS has a fanning structure of radial pores, which enable large amounts of TiO2 nanoparticles to be supported easily on the pore surface. SION@FSS with amorphous TiO2 loaded on the pores (SION@FSS@Am-TiO2) was crystallized to the anatase phase (SION@FSS@A-TiO2), which shows good photocatalytic effect. When used for water purification, SION@FSS@A-TiO2 shows faster dye degradation kinetics compared to commercial P25 nanoparticles. The as-prepared SION@FSS@A-TiO2 photocatalyst could be magnetically recovered easily from water after decolorization of dye.
- Language
- Korean
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