Bifunctional Polymeric Carbon Nitride via Tuning Fabrication Conditions for Photocatalysis

Aleksandrzak, Małgorzata; Baranowska, Daria; Kukułka, Wojciech; Onyszko, M.; Zielińska, Beata; Mijowska, Ewa

doi:10.3390/catal11060651

Cited by 6 publications

(2 citation statements)

References 48 publications

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“…Although some deviation has been noticed, probably related to calcination temperature. Namely, the (002) maximum appeared at 27.36° rather than at 26.51° [31]. The pure TiO2 XRD pattern corresponds to a predominantly anatase-type phase in TiO2 (JCPDS 21-1272) with maxima at 2θ values of 25.33°, 37.67°, 47.97°, 54.04°, 55.03°, 62.69°, 68.86°, 70.21°, 75.06°, 82.85°, corresponding to (101), (004), ( 200), ( 105), ( 211), ( 204), ( 116), ( 220), (215) crystal planes, respectively, and remains unchanged upon addition of g-C3N4 into the composites.…”

Section: Characterization Of the Prepared Materialsmentioning

confidence: 92%

TiO2-Based Heterostructure Containing g-C3N4 for an Effective Photocatalytic Treatment of a Textile Dye

et al. 2022

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Water pollution has become a serious environmental issue. The textile industries using textile dyes are considered to be one of the most polluting of all industrial sectors. The application of solar-light semiconductor catalysts in wastewater treatment, among which TiO2 can be considered a prospective candidate, is limited by rapid recombination of photogenerated charge carriers. To address these limitations, TiO2 was tailored with graphitic carbon nitride (g-C3N4) to develop a heterostructure of g-C3N4@TiO2. Herein, a simple hydrothermal synthesis of TiO2@g-C3N4 is presented, using titanium isopropoxide (TTIP) and urea as precursors. The morphological and optical properties and the structure of g-C3N4, TiO2, and the prepared heterostructure TiO2@g-C3N4 (with different wt.% up to 32%), were analyzed by various laboratory methods. The photocatalytic activity was studied through the degradation of methylene blue (MB) aqueous solution under UV-A and simulated solar irradiation. The results showed that the amount of g-C3N4 and the irradiation source are the most important influences on the efficiency of MB removal by g-C3N4@TiO2. Photocatalytic degradation of MB was also examined in realistic conditions, such as natural sunlight and different aqueous environments. The synthesized g-C3N4@TiO2 nanocomposite showed superior photocatalytic properties in comparison with pure TiO2 and g-C3N4, and is thus a promising new photocatalyst for real-life implementation. The degradation mechanism was investigated using scavengers for electrons, photogenerated holes, and hydroxyl radicals to find the responsible species for MB degradation.

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Section: Characterization Of the Prepared Materialsmentioning

confidence: 92%

TiO2-Based Heterostructure Containing g-C3N4 for an Effective Photocatalytic Treatment of a Textile Dye

et al. 2022

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“…GCN was synthesized according to method reported in [48] . Briefly, 20 g of urea was introduced to alumina crucible with a cover and heated in muffle furnace at 520 °C with heating rate of 4 °C/min for 4 h under air atmosphere.…”

Section: Methodsmentioning

confidence: 99%

Nickel Nanoparticles Encapsulated in Nitrogen‐Doped Carbon Nanofibers as Excellent Bifunctional Catalyst for Hydrogen and Oxygen Evolution Processes

et al. 2022

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The potential of nitrogen-doped carbon nanofibers with encapsulated Ni nanoparticles as a bifunctional catalyst in H 2 and O 2 evolution reactions (HER and OER, respectively) was studied. The proposed heterostructure is fabricated via a facile chemical vapor deposition on Ni supported on graphitic carbon nitride (GCN) as a precursor. HER was an effect of photocatalytic water splitting and catalytic dehydrogenation of lactic acid used as sacrificial electron donor. However, photocatalysis played the dominant role in the acceleration of the reaction rate which was 17 times and 330 times higher in respect to the sample prior the CVD and to pristine GCN, respectively. The catalyst exhibited boosted electrocatalytic activity in OER and outstanding stability in respect to RuO 2 in alkaline medium. The overpotentials calculated from linear sweep voltammetry at 10 mA cm À 2 is ~383 mV for the fabricated electrocatalyst in respect to 490 mV for the RuO 2 and Tafel slope is calculated to be 106 mV dec À 1 in comparison to 136 mV dec À 1 for the reference which is above the state-of the-art bifunctional catalysts reported to date. The results reveal that the catalytic processes were boosted due to several key effects such as enhanced visible light absorption, better charge carriers transfer and separation, increased free charge carrier concentration and higher reducing ability of electrons.

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Comparison of Fenton-like catalytic activity of biochar by in-situ and ex-situ nitrogen doping: Role of carbon quantum dots

Wang,

Wang

2024

Chemosphere

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Bifunctional Polymeric Carbon Nitride via Tuning Fabrication Conditions for Photocatalysis

Cited by 6 publications

References 48 publications

TiO2-Based Heterostructure Containing g-C3N4 for an Effective Photocatalytic Treatment of a Textile Dye

TiO2-Based Heterostructure Containing g-C3N4 for an Effective Photocatalytic Treatment of a Textile Dye

Nickel Nanoparticles Encapsulated in Nitrogen‐Doped Carbon Nanofibers as Excellent Bifunctional Catalyst for Hydrogen and Oxygen Evolution Processes

Comparison of Fenton-like catalytic activity of biochar by in-situ and ex-situ nitrogen doping: Role of carbon quantum dots

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