Low-Temperature Preparation of TiO2 and Photodegradation of Toxic Organic Pollutants

doi:10.7517/j.issn.1674-0475.2009.02.149

Abstract

Abstract: TiO₂ particles were prepared under low-temperature conditions by sol-hydrothermal-steam method.The characteristics of TiO₂ were carried out using XRD,BET,TEM.The results showed the basic structure of product was mainly anatase phase with the existence of brookite phase (121)) and the BET was 106.2 m²/g.The photo-catalytic degradation under UV light (λ≤387 nm) of organic dye Rhodamine B (RhB) was used as probe reactions to evaluate the optimum TiO₂.TiO₂ prepared under low-temperature conditions had a better degradation effect to RhB and 2,4-DCP,which were significantly degradated in TiO₂/UV (λ≤387 nm) system by analysing UV-vis spectroscopy,FTIR and TOC.After 5 h and 7 h the mineralized rate of RhB,2,4-DCP was 81.2%,86.8%,respectively.N,N-diethyl-p-phenylenediamine (DPD),Horseradish peroxidase (POD),spectro-photometry and benzoic acid spectro-fluorescence analysis method were used to detect hydrogen peroxide (H₂O₂) and hydrogen radicals (·OH).The experiment results indicated that photo-catalysis degradation of TiO₂ mainly referred to ·OH radical mechanism.

Key words: low-temperature preparation, titania, organic pollutants, degradation

CLC Number:

DENG An-ping, HUANG Ying-ping, FANG Yan-fen, CHEN Yan, YANG Tian-ming. Low-Temperature Preparation of TiO₂ and Photodegradation of Toxic Organic Pollutants[J]. Imaging Science and Photochemistry, 2009, 27(2): 149-158.

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Low-Temperature Preparation of TiO₂ and Photodegradation of Toxic Organic Pollutants

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