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Comparison Study on Immobilization of Ag-Doped TiO2 using Normal and Reverse Methods for Photodegradation of Methylene Blue Dye
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Researchers developed a novel reverse immobilization method for silver-doped titanium dioxide photocatalysts using rubber and PVC binders, achieving 52% decolorization of methylene blue dye within one hour under visible light. The reverse method outperformed conventional immobilization by preventing solvent disruption of the catalyst layer, improving charge transfer and photoelectrochemical performance.
Immobilized Ag/TiO2 was prepared using reverse (R) and normal (N) methods, employing epoxidized natural rubber (ENR-50) and polyvinyl chloride (PVC) as polymer binders to form a Ag-TiO2/ENR/PVC (ATEP(R)) plate in order to address the solvent interference issue.The immobilization of TiO2 was performed prior to the photodeposition of Ag (50, 100 and 400 ppm), by irradiation with a 250-Watt metal halide lamp for 90 minutes.TiO2 was coated onto glass plates using a dip-coating technique.Methylene blue (MB) was employed as a model pollutant to evaluate the photocatalytic activity of the prepared immobilized Ag/TiO2.Several instruments were used for characterization, including Ultraviolet-Visible Diffuse Reflectance Spectroscopy (UV-Vis DRS), Fourier Transform Infrared spectroscopy (FTIR) and photoelectrochemical (PEC) analysis.The UV-Vis DRS results indicated that the band gap for 100 ppm of Ag-TiO2/ENR/PVC (100-ATEP(R)) was 2.42 eV, with its absorption edge shifted towards the visible region.FTIR analysis showed a peak at 1382 cm -1 , confirming the successful doping of Ag onto TiO2, while a less intense peak for OH at 3400 cm -1 indicated the low hydrophilicity of the photocatalyst.PEC analysis revealed that 100-ATEP(R) exhibited higher current density in linear sweep voltammetry (LSV) curves, lower charge transfer resistance in Nyquist plots and higher photocurrent response in chronoamperometry (CA) plots, compared to TiO2/ENR/PVC (reverse) TEP(R).All immobilized ATEP(R) samples showed excellent photocatalytic degradation of methylene blue (MB) dye and achieved 52 % decolorization within 1 hour of light irradiation, indicating higher photocatalytic activity compared to the normal method.The photocatalytic degradation of all samples followed the pseudo-first-order reaction model of Langmuir Hinshelwood, with R 2 values above 0.90.The results indicate that this new immobilization method may be used for all photocatalysts as it can prevent disruption of the immobilized photocatalyst by the solvent, which is a disadvantage of the normal immobilization method.
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