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Application of TiO2-containing mesoporous spherical activated carbon in a fluidized bed photoreactor—Adsorption and photocatalytic activity

Paper ID Volume ID Publish Year Pages File Format Full-Text
40604 45859 2013 8 PDF Available
Title
Application of TiO2-containing mesoporous spherical activated carbon in a fluidized bed photoreactor—Adsorption and photocatalytic activity
Abstract

A TiO2-containing mesoporous spherical activated carbon (meso-TiO2/SAC) with high adsorption capacity and photocatalytic activity was prepared using ion-exchange method and heat-treatment process. The prepared meso-TiO2/SAC was characterized by SEM, TEM, EDS, XRD, and BET analysis. Results obtained showed that meso-TiO2/SAC had a smooth spherical shape (0.30–0.45 mm) and TiO2 with crystalline size of 10–30 nm was well dispersed on the spherical activated carbon. XRD study confirmed that TiO2 existed in a mixture of anatase (83%) and rutile (17%) phase. The meso-TiO2/SAC presented a high specific surface area of 1649 m2/g. The meso-TiO2/SAC was used for the removal of humic acid (HA) in a fluidized bed photoreactor, the rate of adsorption reaction of HA by meso-TiO2/SAC followed the pseudo second-order kinetic, the adsorption isotherm fitted well to the Freundlich and Langmuir isotherm models. The maximum adsorption capacity of meso-TiO2/SAC determined from Langmuir isotherm was 2.92 mg/g. The effect of the photocatalysis of HA by meso-TiO2/SAC under UV irradiation was investigated under various conditions of varying catalyst dosage, initial HA concentration, and coexisting anion. HA was mineralized up to 80.3% under optimal experimental conditions for a catalyst dosage of 9 g/L and at an initial HA concentration of 20 mg/L. In the presence of coexisting anions, the degradation efficiency of HA was reduced to 72.1% and 72.8% for SO42− and NO3−, respectively. In the cyclic reuse experiment, over 85% of the initial TOC and COD were removed after the eighth cycles, indicating the relatively high photocatalytic stability of meso-TiO2/SAC. TiO2 was not released from the spherical activated carbon during the photocatalytic reaction. The meso-TiO2/SAC developed, therefore has potentials for practical applications in water treatment.

Graphical abstractFigure optionsDownload full-size imageDownload high-quality image (196 K)Download as PowerPoint slideHighlights► The meso-TiO2/SAC was prepared by ion-exchange method and heat-treatment process. ► Nano-sized TiO2 was dispersed on the spherical activated carbon. ► They exhibited high adsorption and photocatalytic activity on the removal of humic acid. ► The meso-TiO2/SAC showed good photocatalytic stability and durability.

Keywords
Adsorption; Photocatalysis; Spherical activated carbon; Titanium dioxide; Humic acid
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Application of TiO2-containing mesoporous spherical activated carbon in a fluidized bed photoreactor—Adsorption and photocatalytic activity
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Publisher
Database: Elsevier - ScienceDirect
Journal: Applied Catalysis A: General - Volume 450, 15 January 2013, Pages 222–229
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
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Price after discount Only $4.95
100% Money Back Guarantee
Full-text PDF Download
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Any Questions? feel free to contact us