Photocatalytic Decomposition of Air Pollutants
Using Electrodeposited Photocatalysts
on Stainless Steel

Hánel, Andreas; Janczarek, Marcin; Lieder, Marek; Hupka, Jan

doi:10.15244/pjoes/81558

Cited by 2 publications

(2 citation statements)

References 27 publications

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“…The hydroxyl ( • OH) and superoxide ( • O 2 -) radicals are generated on the surface of a photocatalyst. Subsequently, HCHO is completely oxidized to carbon dioxide (CO 2 ) and water (H 2 O) which are non-toxic compounds [10,25]. However, the use of TiO 2 powder leads to high aggregation tendency and difficulty in separation and recovery.…”

Section: Introductionmentioning

confidence: 99%

“…However, the use of TiO 2 powder leads to high aggregation tendency and difficulty in separation and recovery. The immobilization of TiO 2 onto different support materials was suggested to overcome these limitations [10,[25][26][27]. Previous studies reported that immobilization techniques and types of support material used in catalyst preparation significantly influenced the photocatalytic properties of the catalyst [26].…”

Section: Introductionmentioning

confidence: 99%

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Immobilization of Silver Doped Titanium Dioxide onto Stainless Steel Wire Mesh for Photocatalytic Degradation of Gaseous Formaldehyde under Visible Light Irradiation

Junyapoon¹,

Sriwong²,

Klypoo³

et al. 2021

Curr. Appl. Sci. Technol.

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Titanium dioxide (TiO2) photocatalysis can degrade air pollutants into nontoxic substances but it can only be excited by UV light. To eliminate this limitation, silver (Ag) and/or graphene oxide (GO) doped TiO2 are applied to enhance visible light photocatalytic activity. In this study, Ag-TiO2 (0.5%, 1%, 2% w/w), GO/TiO2 and GO/Ag-TiO2 were synthesized and then coated on stainless steel mesh. Crystalline and molecule structures, chemical compositions and optical properties of the prepared photocatalyst samples were characterized with X-ray diffraction spectroscopy, X-ray fluorescence spectroscopy, Raman spectroscopy, UV-visible diffuse reflectance spectroscopy, Fourier-transform infrared spectroscopy, and Scanning electron microscopy equipped with Energy dispersive X-ray spectroscopy techniques. The photocatalytic performances of the various doped catalysts were evaluated according to their abilities to degrade gaseous formaldehyde (HCHO) under visible light. The effect of operational parameters on the photocatalytic degradation of HCHO including layer numbers of photocatalyst, powers of fluorescent lamp and flow rates of HCHO were observed. The results indicated that the presence of Ti, O and Ag elements in Ag-TiO2 and Ti, O, Ag and C elements in GO/Ag-TiO2 was confirmed. Proper dispersion of the photocatalyst on the wire mesh was exhibited. Under visible light, the incorporation of Ag and GO in TiO2 photocatalysts produced higher degradation rates of HCHO than pure TiO2. The optimum operating conditions of HCHO degradation at initial concentration of 108.71.15 ppm over visible light irradiation for 30 min were 5 layers of 0.5% Ag-TiO2, 72 W fluorescent light and 300 ml/min of HCHO flow rate. Under these conditions, the removal efficiency of gaseous HCHO was 76.70±0.73%.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Immobilization of Silver Doped Titanium Dioxide onto Stainless Steel Wire Mesh for Photocatalytic Degradation of Gaseous Formaldehyde under Visible Light Irradiation

Junyapoon¹,

Sriwong²,

Klypoo³

et al. 2021

Curr. Appl. Sci. Technol.

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Comparison of structure and solar-selective absorbance properties of Al2O3 thin films with Al and Ni reflector interlayers

et al. 2023

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This work aims at evaluating the selective solar absorbance (SSA) of Al2O3 thin films deposited by physical vapor deposition (PVD) with two different metallic reflector interlayers. Al2O3 thin films are deposited on the same substrate stainless steel (SS) 304L, with two different interlayers between the thin film and the substrate, namely, nickel (Ni) and aluminum (Al) are used as the reflector interlayer SS304L/Al/Al2O3 and SS304L/Ni/Al2O3. A scanning electron microscope (SEM) was utilized to characterize the chemical composition by energy dispersive X-ray analysis (EDX) and surface morphology of the deposited thin films. The phases of the thin films were analyzed and identified by X-ray diffraction (XRD) to detect the present phases. The surface topography and the thickness of the deposited thin films were investigated using an atomic force microscope (AFM). The optical properties of the substrate and the deposited thin films (absorbance & emittance) in two conditions were identified by Fourier transform infrared spectroscopy (FTIR) and spectrophotometer. The obtained results demonstrate that both SS304L/Al/Al2O3 and SS304L/Ni/Al2O3 show good performance, such as high solar absorbance and low thermal emittance. However, the Al/Al2O3 thin film provides high selectivity (absorbance/emittance (α/ε)) of 0.916/0.05, compared to 0.913/0.15 for the Ni/Al2O3 coating. The effect of different properties and microstructure on the efficiency of deposited thin films showed that the SS304L/Al/Al2O3 has higher absorbance (92%) in visible and ultraviolet (UV) regions; and lower emittance (5%) than the SS304L/Ni/Al2O3. This work shows that the intermediate IR layer has a more pronounced effect on the emittance properties rather than the absorbance properties of the Al/Al2O3 layer.

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Photocatalytic Decomposition of Air Pollutants Using Electrodeposited Photocatalysts on Stainless Steel

Cited by 2 publications

References 27 publications

Immobilization of Silver Doped Titanium Dioxide onto Stainless Steel Wire Mesh for Photocatalytic Degradation of Gaseous Formaldehyde under Visible Light Irradiation

Immobilization of Silver Doped Titanium Dioxide onto Stainless Steel Wire Mesh for Photocatalytic Degradation of Gaseous Formaldehyde under Visible Light Irradiation

Comparison of structure and solar-selective absorbance properties of Al2O3 thin films with Al and Ni reflector interlayers

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