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Synthesis of porous platinum-ion-doped titanium dioxide and the photocatalytic degradation of 4-chlorophenol under visible light irradiation

Paper ID Volume ID Publish Year Pages File Format Full-Text
46185 46433 2012 6 PDF Available
Title
Synthesis of porous platinum-ion-doped titanium dioxide and the photocatalytic degradation of 4-chlorophenol under visible light irradiation
Abstract

Porous platinum-ion-doped TiO2 (Pt-TiO2) with BET surface area higher than 200 m2 g−1 was prepared by using water as solvent and conducting dialysis in a sol–gel method and demonstrated to have superior photocatalytic activity for the photodegradation of 4-chlorophenol (4-CP) under both ultraviolet and visible light (VL) irradiation. During dialysis, 76.5% of Cl− was removed and mesopores were formed in Pt-TiO2. Measurements of pore-size distribution indicated a peak at ca. 3 nm after the calcination of Pt-TiO2 at 200 °C. Optimal conditions to prepare Pt-TiO2 acting under VL were 0.5 at.% as the Pt-doping content and 200 °C as the calcination temperature in the range of 200–500 °C. Kinetic studies were performed to clarify the effect of the amount of Pt-TiO2, initial concentration of 4-CP, intensity and wavelength of the incident light, pH and temperature on the reaction rate and to obtain the rate law under VL irradiation. Formation of benzoquinone and hydroquinone as intermediates was observed. They were further photodegraded on Pt-TiO2 and 90.7% of 4-CP was completely mineralized at the VL irradiation of 390 min.

Graphical abstractFigure optionsDownload full-size imageDownload as PowerPoint slideHighlights► Pt-ion doped TiO2 was synthesized by the modified sol–gel method. ► Pt-TiO2 has mesopores and BET surface area higher than 200 m2 g−1. ► Pt-TiO2 shows a superior activity to TiO2 under UV and visible light irradiation. ► Kinetic studies for degradation of 4-chlorophenol were performed under visible light. ► Reaction rate law was proposed.

Keywords
Visible-light responsive photocatalyst; Titanium dioxide; Platinum-doping; Kinetics
First Page Preview
Synthesis of porous platinum-ion-doped titanium dioxide and the photocatalytic degradation of 4-chlorophenol under visible light irradiation
Publisher
Database: Elsevier - ScienceDirect
Journal: Applied Catalysis B: Environmental - Volumes 121–122, 13 June 2012, Pages 148–153
Authors
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Subjects
Physical Sciences and Engineering Chemical Engineering Catalysis