A Comparison Study of New TiO₂/PEG Immobilized Techniques Under Normal and Visible Light Irradiations

Abstract

Abstract. Novel photocatalysts of TiO2 and TiO2/PEG were immobilized using new technique which is double sided adhesive tape (DSAT) as a thin layer binder onto glass plate. The photocatalytic activity study of immobilized/TiO2 and immobilized/TiO2/PEG were carried out by irradiating of 36 mg L -1 MB dye in the presence of normal and visible light with rate of decolourization was estimated from aliquot concentration spectrophotometrically. The high photocatalytic activity from immobilized/TiO2/PEG was observed with the rate constants of ca 0.06 and 0.02 min -1 under normal and visible light irradiation respectively. An active photocatalytic activity was observed for immobilized/TiO2/PEG sample while no photocatalytic activity detected under immobilized/TiO2. The high photoactivity was also detected under normal light for immobilized/TiO2/PEG sample. This might be due to the presence of electron conjugate in PEG that acted as electron donor for TiO2 thus increase the photocatalysis process. Moreover, this electron donor is reported to be able to become active under low energy visible light hence the immobilized/TiO2/PEG can perfomed its photoactivity under visible light irradiation.

Immobilized TiO2-Polyethylene Glycol: Effects of Aeration and pH of Methylene Blue Dye

“…The sample solution was thoroughly shook through a sonication process for one hour, producing a homogenized formulation. The sample films were prepared by using a brush-coating method applied onto glass substrates [24,25], which were cleaned and taped with double-sided adhesive tape (DSAT) prior to coating. The coated glass was then dried using a hot air blower at 100 • C for 15 min.…”

“…The photocatalytic degradation studies for all parameters are based on the previous Section 2.2. Four different air flow rates (25,50,75, and 100 mL·min −1 ) were used to study the effect of aeration rate. Under NL irradiation, the effect of pH was investigated by irradiating an immobilized TiO 2 /PEG sample using different pHs of MB dye solutions (pH 3, 6, 8, 10, 11, and 12).…”

“…This is because film adhesion is one of the biggest challenges in polymer-immobilized photocatalyst [23]. Based on our previous works [24,25], DSAT was not only proven to strengthen the adhesion of TiO 2 film to glass plate, but also improved the reusability of immobilized photocatalyst for up to 30 cycles. The immobilized TiO 2 -DSAT successfully demonstrated an outstanding photocatalytic activity on the decolorization of Reactive Red 4 (RR4) and methylene blue dye.…”

The Preparation and Characterization of Immobilized TiO2/PEG by Using DSAT as a Support Binder

“…A method for immobilizing TiO 2 using DSAT was thoroughly described in the previous article [40]. In this work, a similar approach was taken where TiO 2 was coated onto DSAT as a support binder, but in the presence of a specific amount of PEG.…”