Journal
DESALINATION AND WATER TREATMENT
Volume 167, Issue -, Pages 190-199Publisher
DESALINATION PUBL
DOI: 10.5004/dwt.2019.24629
Keywords
Chitosan; Dye; Immobilization; Photocatalysis; Sensitization; Titanium dioxide
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Funding
- Universiti Sains Malaysia (USM) under the Research University Postgraduate Research Grant Scheme (USM-RU-PGRS) [1001/PKIMIA/842070]
- USM Fellowship
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In this study, an immobilized TiO2/dye-loaded chitosan was designed in a layer-by-layer arrangement for the enhanced photocatalytic degradation of phenol under a 45-W compact household fluorescent light irradiation. The immobilized photocatalyst was supported on glass plates and consists of a porous top layer of TiO2 and sub-layer of chitosan (CS) with chemisorbed Reactive Red 4 (RR4) dye (TiO2/RR4-CS/glass). Results from the optical studies demonstrated that the absorption threshold of the immobilized photocatalyst was shifted to the visible light region with lower recombination of electron-hole pairs. The TiO2/RR4-CS/glass exhibits improved photocatalytic degradation and mineralization of phenol as compared with the TiO2/glass and TiO2/CS/glass photocatalysts, with a degradation rate of 0.030 min(-1) and total mineralization of 76.7%. The immobilized photocatalyst also exhibited excellent photocatalytic stability and could be reused for up to five cycles of phenol treatment. The enhanced photocatalytic performance of the TiO2/RR4-CS/glass can be ascribed to the synergistic photocatalytic and sensitization effects that run concurrently under light irradiation.
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