Preparation of CdS-modified TiO2 Nanoribbon and Photocatalytic Degradation of Toxic Organic Pollutants

doi:10.7517/j.issn.1674-0475.2010.03.161

Abstract

Abstract: TiO₂ nanoribbon was synthesized by the hydrothermal method at 210℃ using titanium sulfate as the raw material.TiO₂@CdS composite photo-catalyst was synthesized by modifying TiO₂ surface with CdS through the precipitation method.The structure of TiO₂@CdS powders were characterized by X-ray diffraction (XRD),transmission electron microscope (TEM) and UV-Vis absorption spectral techniques.The photo-catalytic activity of TiO₂@CdS was studied using photocatalytic degradation of Rhodamine B,Salicylic Acid and 2,4-dichlorophenol (2,4-DCP) under visible light (λ≥450 nm) as the probe reactions.The effects of the reaction temperature,medium and CdS loading on the structural properties of TiO₂@CdS were investigated.The results showed that the prepared TiO₂ nanoribbon had good dispersivity.Composite nanocrystalline particle was composed of TiO₂ with anatase crystalline structure and CdS with zinc-blend crysatalline structure.At room temperature (25℃),the activity of TiO₂ decorated with CdS in neutral medium was enhanced by 29 times as compared with pure TiO₂ under the visible light irradiation.Therefore,the photo-activity of CdS was improved by TiO₂.In TiO₂@CdS/Vis system,the photodegradation of Salicylic Acid (SA) over TiO₂@CdS was much promoted compared with pure TiO₂ nanoribbon.The mineralized rates of Rhodamine B (RhB) and 2,4-dichlorophenol (2,4-DCP) reached 47.8% and 30.8% after 15 and 21 hours respectively at pH 7.0.

Key words: CdS, TiO₂ nanoribbon, photocatalyst

CLC Number:

O611
X703

LIU Jun-zi, WANG Pan, HE Yan, DENG An-ping, LI Rui-ping, HUANG Ying-ping. Preparation of CdS-modified TiO₂ Nanoribbon and Photocatalytic Degradation of Toxic Organic Pollutants[J]. Imaging Science and Photochemistry, 2010, 28(3): 161-172.

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Preparation of CdS-modified TiO₂ Nanoribbon and Photocatalytic Degradation of Toxic Organic Pollutants

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