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Preparation of carbon-sensitized and Fe–Er codoped TiO2 with response surface methodology for bisphenol A photocatalytic degradation under visible-light irradiation

Paper ID Volume ID Publish Year Pages File Format Full-Text
46536 46441 2012 13 PDF Available
Title
Preparation of carbon-sensitized and Fe–Er codoped TiO2 with response surface methodology for bisphenol A photocatalytic degradation under visible-light irradiation
Abstract

The carbon-sensitized and Fe–Er codoped TiO2 (Fe/Er–TiO2) was synthesized by a facile solvothermal method using titanium isopropoxide both as titanium precursor and carbon source, as well as ferric nitrate and erbium nitrate as dopants source. The response surface methodology (RSM) with central composite design (CCD) model was used to obtain the optimum synthesis conditions for this novel Fe/Er–TiO2. The RSM was also applied to study the main and interactive effects of the parameters (Er concentration [Er], Fe concentration [Fe] and calcination temperature [CT]) investigated. The experimental results indicated an improved photocatalytic activity of Fe/Er–TiO2 for bisphenol A (BPA) degradation compared to the pristine TiO2, Er–TiO2, Fe–TiO2 and Degussa P25 (P25) under visible light irradiation. In addition, the RSM model obtained (R2 = 0.929) showed a satisfactory correlation between the experimental results and predicted values of BPA removal efficiency. The identified optimum condition for preparing Fe/Er–TiO2 was 1.5 mol%, 1.25 mol% and 450 °C for [Er], [Fe] and [CT], respectively. Moreover, the photocatalytic activity of the optimized Fe/Er–TiO2 was preserved effectively even after ten cycles of use. The possible photocatalytic mechanisms induced by the Fe/Er–TiO2 under visible light irradiation are proposed. The enhanced photocatalytic activity of Fe/Er–TiO2 can be attributed to the synergistic effects of photosensitizing (CO band), narrowed band gap and enhanced e−/h+ separation (Ti–O–Fe linkage), and upconversion luminescence property (Ti–O–Er linkage).

Graphical abstractFigure optionsDownload full-size imageDownload as PowerPoint slideHighlights▸ Fe/Er–TiO2 was prepared via a facile solvothermal method. ▸ RSM was used to obtain the optimum synthesis conditions for this novel Fe/Er–TiO2. ▸ RSM was used to examine the main and interactive effects of the synthesis parameters. ▸ Photocatalytic degradation of BPA under various conditions was investigated. ▸ Photocatalytic mechanism on Fe/Er–TiO2 under visible light irradiation was proposed.

Keywords
Carbon-sensitizing; Fe–Er codoping; Response surface methodology; Photocatalytic degradation; Upconversion luminescence
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Preparation of carbon-sensitized and Fe–Er codoped TiO2 with response surface methodology for bisphenol A photocatalytic degradation under visible-light irradiation
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Publisher
Database: Elsevier - ScienceDirect
Journal: Applied Catalysis B: Environmental - Volume 126, 25 September 2012, Pages 121–133
Authors
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Subjects
Physical Sciences and Engineering Chemical Engineering Catalysis
Get Full-Text Now
Don't Miss Today's Special Offer
Price was $35.95
You save - $31
Price after discount Only $4.95
100% Money Back Guarantee
Full-text PDF Download
Online Support
Any Questions? feel free to contact us