One-step synthesis of oxygen doped g-C3N4 for enhanced visible-light photodegradation of Rhodamine B

Tran, Doan An; Pham, Chi Thanh Nguyen; Ngoc, Tri Nguyen; Phi, Hung Nguyen; Ta, Qui Thanh Hoai; Truong, Duy Huong; Nguyen, Van Thang; Luc, Huy Hoang; Nguyen, Le Tuan; Nhiệm, Đào Ngọc; Kim, Sung Jin; Vo, Vien

doi:10.1016/j.jpcs.2020.109900

Cited by 87 publications

(37 citation statements)

References 59 publications

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“…Significantly, compared with the XRD pattern of g-C 3 N 4 (Figure c), the (100) peak of O-g-C 3 N 4 shifts from 13.1° to 10.5°, corresponding to an increase in the interplanar distance between nitride pores from 0.677 to 0.832 nm . Moreover, it can also be observed that there is a slight shift of the (002) peak from 27.4° for g-C 3 N 4 to 27.6° for O-g-C 3 N 4 (inset in Figure c), indicating a reduction in the layer packing distance from 0.326 to 0.325 nm . Furthermore, the room temperature EPR spectra show that the EPR intensity of O-g-C 3 N 4 is significantly enhanced compared to that of g-C 3 N 4 , as shown in Figure d, indicating that more unpaired electrons were generated after O-doping .…”

Section: Resultsmentioning

confidence: 85%

Activating Pd Nanoparticles on Oxygen-Doped g-C₃N₄ for Visible Light-Driven Thermocatalytic Oxidation of Benzyl Alcohol

et al. 2022

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Direct oxidation of benzyl alcohol (BzOH) to benzaldehyde (BzH) using O 2 as the oxidant has crucial significance under mild conditions in industrial manufacturing. Herein, an efficient and ecofriendly Pd/O-g-C 3 N 4 heterojunction catalyst using oxygen-doped g-C 3 N 4 (O-g-C 3 N 4 ) with a porous surface as the support is developed for visible light-driven thermocatalytic oxidation of BzOH to BzH by using O 2 as the sole oxidant. The obtained Pd/O-g-C 3 N 4 exhibits visible light-enhanced catalytic performance under visible light irradiation with BzOH conversion and BzH yield of 89.4 and 76.6%, respectively, which are 1.96 and 1.83 times higher than those for the catalyst in the dark. Oxygen doping, as well as Pd deposition, can significantly narrow the band gap of g-C 3 N 4 , thereby enhancing its visible light harvesting ability. The resulting heterojunction interface between Pd nanoparticles and O-g-C 3 N 4 might promote separation of the photogenerated e − −h + pairs. In addition to achieving considerable BzOH conversion and BzH yield, Pd/O-g-C 3 N 4 also exhibits impressive stability. The current study provides potential applications for the green and efficient catalytic oxidation of other alcohols to corresponding aldehydes using O 2 as the oxidant.

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Section: Resultsmentioning

confidence: 85%

Activating Pd Nanoparticles on Oxygen-Doped g-C₃N₄ for Visible Light-Driven Thermocatalytic Oxidation of Benzyl Alcohol

et al. 2022

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“…1d) can be fitted and decomposed into three peaks at 285.4, 287.1, and 289.1 eV, which are related to the sp 2 C–C bond of graphitic carbon, the sp 2 bonded carbon of N–CN, and the C–O bond, respectively. 31 For the N 1s spectra (Fig. 1e), the two peaks at 399.6 and 401.1 eV are attributed to PN and C–NC, respectively.…”

Section: Resultsmentioning

confidence: 96%

Ultrafast carrier transport in ultrafine porous 2D polymers for the highly selective photocatalytic reduction of CO₂to CH₄

et al. 2022

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“…4 c. According to previous studies on PL properties of g-C 3 N 4 , its electronic band structure is constructed from band of σ(sp 3 C–N) bonds, π(sp 2 C–N) bonds, and the lone pair (LP) electrons of bridging N 53 – 55 . Therefore, three components in PL emission of g-C 3 N 4 at 448.6, 475.9, and 517.9 nm corresponding to energy gaps of 2.76, 2.60, and 2.39 eV could be assigned to π* → π, σ* → LP, and π* → LP transition pathways 11 , 56 . In pure g-C 3 N 4 , the recombination process could occur between LP donor of N-atoms to aromatic acceptor 57 , 58 .…”

Section: Resultsmentioning

confidence: 96%

“…Although light harvesting ability of g-C 3 N 4 shifts toward visible region, photocatalytic performance of pure g-C 3 N 4 is insufficient owning to its relatively low light absorption coefficient, short lifetime of photo-generated electrons and holes, and low specific surface area 6 , 7 . In order to overcome these disadvantages, various methods have been investigated such as co-polymeration 8 , altering different precursors 9 , nonmetal doping 7 , 10 , 11 , and exfoliation into thin layers 12 . In addition to these methods, constructing g-C 3 N 4 with other semiconductors in heterojunction has been considered as an efficient solution to improve the separation of photo-generated electron–hole pairs 13 – 15 .…”

Section: Introductionmentioning

confidence: 99%

One-pot synthesis of S-scheme MoS2/g-C3N4 heterojunction as effective visible light photocatalyst

Huu

Thi

Nguyen

et al. 2021

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Despite pioneering as the holy grail in photocatalysts, abundant reports have demonstrated that g-C3N4 performs poor photocatalytic activity due to its high recombination rate of photo-induced charge carriers. Many efforts have been conducted to overcome this limitation in which the semiconductor–semiconductor coupling strategies toward heterojunction formation were considered as the easiest but the most effective method. Herein, a one-pot solid-state reaction of thiourea and sodium molybdate as precursors at different temperatures under N2 gas was applied for preparing composites of MoS2/g-C3N4. The physicochemical characterization of the final products determines the variation in contents of components (MoS2 and g-C3N4) via the increase of synthesis temperature. The enhanced photocatalytic activity of the MoS2/g-C3N4 composites was evaluated by the degradation of Rhodamine B in an aqueous solution under visible light. Therein, composites synthesized at 500 °C showed the best photocatalytic performance with a degradation efficiency of 90%, much higher than that of single g-C3N4. The significant improvement in photocatalytic performance is attributed to the enhancement in light-harvesting and extension in photo-induced charge carriers’ lifetime of composites which are originated from the synergic effect between the components. Besides, the photocatalytic mechanism is demonstrated to well-fit into the S-scheme pathway with apparent evidences.

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One-step synthesis of oxygen doped g-C3N4 for enhanced visible-light photodegradation of Rhodamine B

Cited by 87 publications

References 59 publications

Activating Pd Nanoparticles on Oxygen-Doped g-C₃N₄ for Visible Light-Driven Thermocatalytic Oxidation of Benzyl Alcohol

Activating Pd Nanoparticles on Oxygen-Doped g-C₃N₄ for Visible Light-Driven Thermocatalytic Oxidation of Benzyl Alcohol

Ultrafast carrier transport in ultrafine porous 2D polymers for the highly selective photocatalytic reduction of CO₂to CH₄

One-pot synthesis of S-scheme MoS2/g-C3N4 heterojunction as effective visible light photocatalyst

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One-step synthesis of oxygen doped g-C3N4 for enhanced visible-light photodegradation of Rhodamine B

Cited by 87 publications

References 59 publications

Activating Pd Nanoparticles on Oxygen-Doped g-C3N4 for Visible Light-Driven Thermocatalytic Oxidation of Benzyl Alcohol

Activating Pd Nanoparticles on Oxygen-Doped g-C3N4 for Visible Light-Driven Thermocatalytic Oxidation of Benzyl Alcohol

Ultrafast carrier transport in ultrafine porous 2D polymers for the highly selective photocatalytic reduction of CO2to CH4

One-pot synthesis of S-scheme MoS2/g-C3N4 heterojunction as effective visible light photocatalyst

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Activating Pd Nanoparticles on Oxygen-Doped g-C₃N₄ for Visible Light-Driven Thermocatalytic Oxidation of Benzyl Alcohol

Activating Pd Nanoparticles on Oxygen-Doped g-C₃N₄ for Visible Light-Driven Thermocatalytic Oxidation of Benzyl Alcohol

Ultrafast carrier transport in ultrafine porous 2D polymers for the highly selective photocatalytic reduction of CO₂to CH₄