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Titanium dioxide/zeolite integrated photocatalytic adsorbents for the degradation of amoxicillin

Paper ID Volume ID Publish Year Pages File Format Full-Text
45696 46421 2015 11 PDF Available
Title
Titanium dioxide/zeolite integrated photocatalytic adsorbents for the degradation of amoxicillin
Abstract

•Integrated photocatalytic adsorbents were prepared from TiO2 and natural zeolite.•IPAs were utilized for the degradation of the antibiotic AMX.•IPA pre-treated by acid-alkaline and calcined at 300 °C under N2 performed best.•Hydrolysis contributed to the overall degradation of AMX upon IPA-photocatalysis.•AMX degradants from thermal hydrolysis were identified by LC-MS.

Integrated photocatalytic adsorbents (IPA) prepared from TiO2 and natural zeolite were applied to amoxicillin (AMX) degradation. The acid-alkali pre-treated zeolite annealed at 300 °C under nitrogen resulted in the best degradation of AMX. The superior performance of this IPA material was explained using scanning electron microscopy (SEM), energy-dispersive spectroscopy (EDS) and X-ray diffraction (XRD). SEM analysis showed an uneven surface as a result of TiO2 cluster deposition, which provides more active sites for adsorption and degradation. XRD results revealed that peaks from more photoactive anatase were more prominent in this IPA material. EDS analyses also confirmed the presence of high amounts of TiO2. Despite their large TiO2 loadings, comparison experiments with untreated zeolite suggested that the pores are still available for adsorption. The overall performance of the IPA material for the degradation of AMX was thus attributed to the adsorption capability of the zeolite carrier, the photocatalytic activity of TiO2 coating and acid-catalyzed hydrolysis (‘capture & destroy’). Degradation products resulting from TiO2/zeolite IPA-induced hydrolysis were identified by liquid chromatography-mass spectrometry (LC-MS) prior to photocatalytic treatment. AMX and its thermal degradants were almost completely removed after 240 min of irradiation. The efficiency of the developed TiO2/zeolite material provides a potentially economical way of degrading pharmaceutical compounds and recovering photocatalysts simultaneously.

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Keywords
Photocatalysis; Natural zeolite; Integrated photocatalytic adsorbent; Titanium dioxide; Amoxicillin; Hydrolysis
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Titanium dioxide/zeolite integrated photocatalytic adsorbents for the degradation of amoxicillin
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Publisher
Database: Elsevier - ScienceDirect
Journal: Applied Catalysis B: Environmental - Volumes 166–167, May 2015, Pages 45–55
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