Immobilizing TiO2 on nickel foam for an enhanced photocatalysis in NO abatement under visible light

Zeng, Qimiao; Chen, Jingwen; Wan, Yanshan; Ni, Jiupai; Ni, Chengsheng; Chen, Hong

doi:10.1007/s10853-022-07628-4

Cited by 6 publications

(14 citation statements)

References 60 publications

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“…They were higher intensity for samples heated at lower temperatures (Figure 9). However, opposite to this, NO 2 − species were accumulated more intensively on the sample heated at 600 • C (bands at 1480-1360 cm −1 and 1540 cm −1 ) [8,15] than on those prepared at lower temperatures. NO + species (band at around 1700 cm −1 ) [15] was clearly visible for the sample heated at 600 • C.…”

Section: Resultsmentioning

confidence: 77%

“…This means that there is remaining ethanol on the TiO 2 surface in the sample heated at 400 • C. The additional bands, which are observed on FTIR spectra at 1630 and 3680 cm −1 are attributed to OH groups in TiO 2 [8]. The broad band at the range of 800-600 cm −1 is related to Ti-O vibrations in TiO 2 [15,20]. At 500 • C the C-O band characteristic for alcohols was almost completely reduced, instead of this -COO vibrations of the acetate group appeared at the range of 1557-1488 cm [22].…”

Section: Resultsmentioning

confidence: 95%

“…The intensities of the broad band at 3700-2500 cm −1 and that at 1630 cm −1 were greatly depleted compared to the TiO2/nickel foam samples heated at lower temperatures. Instead of this, a small intensity band at 3740 cm −1 appeared as Nickel foam showed the insignificant intensity of the band at 1140 cm −1 assigned to the stretching vibrations of the C-O group and the broad band at the range of 600-400 cm −1 attributed to Ni-O bonding [15,20]. Sample heat-treated at 400 • C showed high intensity and broad band at 3700-2500 cm −1 , characteristic of O-H vibrations in alcohols and TiO 2 [8,21].…”

Section: Resultsmentioning

confidence: 98%

“…Figure 8 presents the FTIR spectra of nickel foam as received and coated by TiO 2 particles. Nickel foam showed the insignificant intensity of the band at 1140 cm −1 assigned to the stretching vibrations of the C-O group and the broad band at the range of 600-400 cm −1 attributed to Ni-O bonding [15,20]. Sample heat-treated at 400 °C showed high intensity and broad band at 3700-2500 cm −1 , characteristic of O-H vibrations in alcohols and TiO2 [8,21].…”

Section: Resultsmentioning

confidence: 99%

“…However, for a real application of TiO 2 for the removal of NO x , it has to be immobilized on the support. Different supported materials have been already tested, such as asphalt, pavement, cement, mortar, glass, polymers, steel, nickel foam, and others [13][14][15][16][17][18]. The interaction of support with TiO 2 occurs in the case of a thin layer coating.…”

Section: Introductionmentioning

confidence: 99%

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Application of TiO2 Supported on Nickel Foam for Limitation of NOx in the Air via Photocatalytic Processes

Tryba,

Prowans,

Wróbel

et al. 2024

Molecules

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TiO2 was loaded on the porous nickel foam from the suspended ethanol solution and used for the photocatalytic removal of NOx. Such prepared material was heat-treated at various temperatures (400–600 °C) to increase the adhesion of TiO2 with the support. Obtained TiO2/nickel foam samples were characterized by XRD, UV–Vis/DR, FTIR, XPS, AFM, SEM, and nitrogen adsorption at 77 K. Photocatalytic tests of NO abatement were performed in the rectangular shape quartz reactor, irradiated from the top by UV LED light with an intensity of 10 W/m2. For these studies, a laminar flow of NO in the air (1 ppm) was applied under a relative humidity of 50% and a temperature of 28 °C. Concentrations of both NO and NO2 were monitored by a chemiluminescence NO analyzer. The adsorption of nitrogen species on the TiO2 surface was determined by FTIR spectroscopy. Performed studies revealed that increased temperature of heat treatment improves adhesion of TiO2 to the nickel foam substrate, decreases surface porosity, and causes removal of hydroxyl and alcohol groups from the titania surface. The less hydroxylated surface of TiO2 is more vulnerable to the adsorption of NO2 species, whereas the presence of OH groups on TiO2 enhances the adsorption of nitrate ions. Adsorbed nitrate species upon UV irradiation and moisture undergo photolysis to NO2. As a consequence, NO2 is released into the atmosphere, and the efficiency of NOx removal is decreasing. Photocatalytic conversion of NO to NO2 was higher for the sample heated at 400 °C than for that at 600 °C, although coverage of nickel foam by TiO2 was lower for the former one. It is stated that the presence of titania defects (Ti3+) at low temperatures of its heating enhances the adsorption of hydroxyl groups and the formation of hydroxyl radicals, which take part in NO oxidation. Contrary to that, the presence of titania defects in TiO2 through the formation of ilmenite structure (NiTiO3) in TiO2/nickel foam heated at 600 °C inhibits its photocatalytic activity. No less, the sample obtained at 600 °C indicated the highest abatement of NOx due to the high and stable adsorption of NO2 species on its surface.

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Section: Resultsmentioning

confidence: 77%

Section: Resultsmentioning

confidence: 95%

Section: Resultsmentioning

confidence: 98%

Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

Application of TiO2 Supported on Nickel Foam for Limitation of NOx in the Air via Photocatalytic Processes

Tryba,

Prowans,

Wróbel

et al. 2024

Molecules

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Synthetic Chemistry in Flow: From Photolysis & Homogeneous Photocatalysis to Heterogeneous Photocatalysis

Feng,

2024

ChemSusChem

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Photocatalytic synthesis of value‐added chemicals has gained increasing attention in recent years owing to its versatility in driving many important reactions under ambient conditions. Selective hydrogenation, oxidation, coupling, and halogenation with a high conversion of the reactants have been realized using designed photocatalysts in batch reactors with small volumes at a laboratory scale; however, scaling‐up remains a critical challenge due to inefficient utilization of incident light and active sites of the photocatalysts, resulting in poor catalytic performance that hinders its practical applications. Flow systems are considered one of the solutions for practical applications of light‐driven reactions and have experienced great success in photolytic and homogeneous photocatalysis, yet their applications in heterogeneous photocatalysis are still under development. In this perspective, we have summarized recent progress in photolytic and photocatalytic synthetic chemistry performed in flow systems from the view of reactor design with a special focus on heterogeneous photocatalysis. The advantages and limitations of different flow systems, as well as some practical considerations of design strategies are discussed.

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Br vacancy engineering in Cs3Bi2Br9 for photocatalytic NO oxidation under visible light

Chen

Menglin

et al. 2023

Environ Sci Pollut Res

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Immobilizing TiO2 on nickel foam for an enhanced photocatalysis in NO abatement under visible light

Cited by 6 publications

References 60 publications

Application of TiO2 Supported on Nickel Foam for Limitation of NOx in the Air via Photocatalytic Processes

Application of TiO2 Supported on Nickel Foam for Limitation of NOx in the Air via Photocatalytic Processes

Synthetic Chemistry in Flow: From Photolysis & Homogeneous Photocatalysis to Heterogeneous Photocatalysis

Br vacancy engineering in Cs3Bi2Br9 for photocatalytic NO oxidation under visible light

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