Enhanced photocatalytic degradation of caffeine using titanium dioxide photocatalyst immobilized on circular glass sheets under ultraviolet C irradiation

Journal article

Authors/Editors

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Publication Details

Author list: Muangmora R., Kemacheevakul P., Punyapalakul P., Chuangchote S.

Publisher: MDPI

Publication year: 2020

Volume number: 10

Issue number: 9

Start page: 1

End page: 14

Number of pages: 14

ISSN: 20734344

eISSN: 2073-4344

URL: https://www.scopus.com/inward/record.uri?eid=2-s2.0-85090531658&doi=10.3390%2fcatal10090964&partnerID=40&md5=d97f9692fcfc5dee9eed18e720b3c5e6

Languages: English-Great Britain (EN-GB)

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Abstract

This work presents the development of titanium dioxide (TiO2) film immobilized on circular glass sheets for photocatalytic degradation of caffeine under ultraviolet C (UVC) irradiation. TiO2 was synthesized through the ultrasonic-assisted sol–gel method and immobilized on circular glass sheets by the doctor blade technique. Polyvinylpyrrolidone (PVP) was used to mix with the TiO2 precursor solution to enhance film adhesion on the glass surface. TiO2 film was mainly composed of anatase phase with a small amount of rutile phase. Caffeine removal was found to increase with increasing irradiation time. Caffeine (20 mg/L) in the synthetic wastewater could not be detected after 3 h of UVC irradiation. The reaction rate of caffeine degradation followed the pseudo-first-order model. The concentrated caffeine solutions required a longer irradiation time for degradation. The used TiO2-coated glass sheets could be easily separated from the treated wastewater and reusable. The caffeine removal efficiency of TiO2-coated glass sheets in each cycle maintained a high level (~100%) during fifteen consecutive cycles. © 2020 by the authors. Licensee MDPI, Basel, Switzerland.

Keywords

Photocatalytic degradation, Ultraviolet C