Abstract
Immobilized TiO2 was prepared by adding a small composition of polyethylene glycol (PEG) as a binder, and this paper reported for the very first time the formation of C=O from oxidized PEG, which acted as an electron injector in enhancing photoactivity. Water-based TiO2 with PEG formulation was deposited by using a brush technique onto double-sided adhesive tape (DSAT) as a support binder to increase the adhesiveness of immobilized TiO2. The photocatalytic activity of immobilized TiO2-PEG was measured by photodegradation of 12 mg·L−1 methylene blue (MB) dye. The optimum condition of immobilized TiO2-PEG was observed at TiO2/PEG-2 (TP2) with 10:0.1 for the TiO2/PEG ratio, which resulted in a 1.8-times higher photodegradation rate as compared to the suspension mode of pristine TiO2. The high photodegradation rate was due to the formation of the active C=O bond from oxidized PEG binder in immobilized TiO2-PEG as observed by Fourier transform infrared and X-ray photoelectron spectroscopy analyses. The presence of C=O has escalated the photoactivity by forming an electron injector to a conduction band of TiO2 as proven by higher photoluminescence intensity obtained for TP2 as compared to pristine TiO2. The TP2 sample has also increased its adhesiveness when DSAT is applied as a support binder where it can be recycled up to eight times and comparable to recent photocatalysis cycle developments.
Highlights
Titanium oxide (TiO2 ) is a semiconductor that is widely known as a photocatalyst for the photodegradation of organic pollutants
In this study, immobilized TiO2 mixed with a small amount of polyethylene glycol (PEG) 6000 was prepared using double-sided adhesive tape (DSAT) as a support binder to observe the interaction between TiO2 and PEG during photocatalysis process
An immobilized active TiO2 photocatalyst was successfully prepared via adding a small amount of PEG as a binder onto a support binder of double-sided adhesive tape (DSAT)
Summary
Titanium oxide (TiO2 ) is a semiconductor that is widely known as a photocatalyst for the photodegradation of organic pollutants. Excessive binder makes immobilized film strong, but reduces its photoactivity; a low amount of polymer makes TiO2 leach out This explained the lack of data discussed by other researchers on the surface chemical interaction of PEG in immobilized TiO2. In this study, immobilized TiO2 mixed with a small amount of PEG 6000 was prepared using DSAT as a support binder to observe the interaction between TiO2 and PEG during photocatalysis process. The photoactivity of this immobilized TiO2 -PEG was observed by photodegradation of methylene blue, applied with specific parameters
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