Performance of titanium dioxide microcapsules as a photooxidation catalyst for decolourization of methylene blue

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	Performance of titanium dioxide microcapsules as a photooxidation catalyst for decolourization of methylene blue
	Supsakulchai, A ; Ma, GH ; Nagai, M ; Omi, S
刊名	JOURNAL OF MICROENCAPSULATION
	2003
卷号	20 期号:1 页码:19-33
关键词	TiO2 microcapsules photocatalyst poly(styrene-co-2-ethylhexyl acrylate) methylene blue sustainability of catalyst
ISSN号	0265-2048
英文摘要	The performance of anatase type titanium dioxide (TiO2) encapsulated with styrenic copolymers via the solvent evaporation or suspension polymerization process was investigated as a photocatalyst for the decolourization of methylene blue (MB, 3,4-bis(dimethylamino)-phenothiazine-5-thionium chloride) in the aqueous phase. The TiO2 microcapsules, loaded with 4-8 wt% TiO2, were dispersed in a B aqueous solution containing an adequate amount of hydroperoxide as an oxygen source, and the mixture was exposed to 365 nm UV light. The decolourization of MB proceeded according to the first order of the MB concentration. The apparent rate constant, defined based on the unit weight of loaded TiO2, depended on the initial concentration of MB. The capsule walls, composed of cross-linked and/or uncross-linked poly(styrene-co-2-ethylhexyl acrylate), favoured the adsorption of MB on the capsule surface and promoted the decomposition. The observations of the cross-section of microcapsules by transmission electron microscopy (TEM) showed similar morphology of microcapsules regardless of preparation method; a thin layer of hydrophilic TiO2 particles being localized near the particle surface. The sustainability of the microcapsules was also proved by doing experiments successively for 7 days. Smaller size microcapsules were favoured for the decomposition of MB, and the rate constant increased with the surface area of microcapsules in unit volume of the reaction mixture. Although large size microcapsules with uncross-linked polymer wall had a disadvantage of breaking under high shear agitation, those prepared with cross-linked polymer wall by suspension polymerization still remained effective after the sustainability test for 7 days.
WOS标题词	Science & Technology ; Physical Sciences ; Technology ; Life Sciences & Biomedicine
类目[WOS]	Chemistry, Applied ; Engineering, Chemical ; Pharmacology & Pharmacy
研究领域[WOS]	Chemistry ; Engineering ; Pharmacology & Pharmacy
关键词[WOS]	HYDROXYL RADICAL ATTACK ; MINIEMULSION POLYMERIZATION ; PHOTOCATALYTIC DEGRADATION ; INORGANIC PARTICLES ; TIO2 PARTICLES ; ENCAPSULATION ; OXIDATION ; KINETICS ; DROPLETS ; SURFACE
收录类别	SCI
语种	英语
WOS记录号	WOS:000180292600002
公开日期	2013-09-20
内容类型	期刊论文
版本	出版稿
源URL	[http://ir.ipe.ac.cn/handle/122111/1571]
专题	过程工程研究所_生化工程国家重点实验室
作者单位	1.Tokyo Univ Agr & Technol, Grad Sch Bioapplicat & Syst Engn, Tokyo 1848588, Japan 2.Chinese Acad Sci, Natl Key Lab Biochem Engn, Inst Proc Engn, Beijing 100080, Peoples R China
推荐引用方式 GB/T 7714	Supsakulchai, A,Ma, GH,Nagai, M,et al. Performance of titanium dioxide microcapsules as a photooxidation catalyst for decolourization of methylene blue[J]. JOURNAL OF MICROENCAPSULATION,2003,20(1):19-33.
APA	Supsakulchai, A,Ma, GH,Nagai, M,&Omi, S.(2003).Performance of titanium dioxide microcapsules as a photooxidation catalyst for decolourization of methylene blue.JOURNAL OF MICROENCAPSULATION,20(1),19-33.
MLA	Supsakulchai, A,et al."Performance of titanium dioxide microcapsules as a photooxidation catalyst for decolourization of methylene blue".JOURNAL OF MICROENCAPSULATION 20.1(2003):19-33.