One-pot synthesis of sodium-doped willow-shaped graphitic carbon nitride for improved photocatalytic activity under visible-light irradiation

Dou, Qiang; Hou, Jianhua; Hussain, Asif; Zhang, Geshan; Zhang, Yongcai; Luo, Min; Wang, Xiaozhi; Cao, Chuanbao

doi:10.1016/j.jcis.2022.05.085

Cited by 41 publications

(9 citation statements)

References 52 publications

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“…The binding energy of N–CN increases from 287.71, 287.83, and 287.84 to 287.87 eV with the Zn content increasing. The binding formation of Zn–N affected the chemical environment of the adjacent C atoms and decreased the electronic density of the C atoms, which led to the binding energy increase Figure c shows the high-resolution spectrum of N1s, and the peaks at 398.10, 398.94, and 400.23 eV correspond to pyridinic N (C–NC), pyrrolic N (N–(C) 3 ), and graphitic N (C–N–H) in the heptazine ring, respectively .…”

Section: Results and Discussionmentioning

confidence: 99%

“…The binding formation of Zn−N affected the chemical environment of the adjacent C atoms and decreased the electronic density of the C atoms, which led to the binding energy increase. 47 Figure 3c shows the high-resolution spectrum of N1s, and the peaks at 398.10, 398.94, and 400.23 eV correspond to pyridinic N (C− N�C), pyrrolic N (N−(C) 3 ), and graphitic N (C−N−H) in the heptazine ring, respectively. 48 Transition cations are always captured by pyridinic N to form coordination bonds due to its lone pair electrons, which decreased the electronic density around the N atom.…”

Section: Materials and Reagentsmentioning

confidence: 99%

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Tuning Band Gap in Fe-Doped g-C₃N₄by Zn for Enhanced Fenton-Like Catalytic Performance

Jiang

Nan

2023

Inorg. Chem.

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Multiple oxidation states of first-row transition-metal cations were always doped in g-C3N4 to enhance the catalytic activity by the synergistic action between the cations in the Fenton-like reaction. It remains a challenge for the synergistic mechanism when the stable electronic centrifugation (3d 10) of Zn2+ was used. In this work, Zn2+ was facilely introduced in Fe-doped g-C3N4 (named xFe/yZn-CN). Compared with Fe-CN, the rate constant of the tetracycline hydrochloride (TC) degradation increased from 0.0505 to 0.0662 min–1 for 4Fe/1Zn-CN. The catalytic performance was more outstanding than those of similar catalysts reported. The catalytic mechanism was proposed. With the introduction of Zn2+ in 4Fe/1Zn-CN, the atomic percent of Fe (Fe2+ and Fe3+) and the molar ratio of Fe2+ to Fe3+ at the catalyst’s surface increased, where Fe2+ and Fe3+ were the active sites for adsorption and degradation. In addition, the band gap of 4Fe/1Zn-CN decreased, leading to enhanced electron transfer and conversion from Fe3+ to Fe2+. These changes resulted in the excellent catalytic performance of 4Fe/1Zn-CN. Radicals •OH, •O2 –, and 1O2 formed in the reaction and took different actions under various pH values. 4Fe/1Zn-CN exhibited excellent stability after five cycles under the same conditions. These results may give a strategy for synthesizing Fenton-like catalysts.

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Section: Results and Discussionmentioning

confidence: 99%

Section: Materials and Reagentsmentioning

confidence: 99%

Tuning Band Gap in Fe-Doped g-C₃N₄by Zn for Enhanced Fenton-Like Catalytic Performance

Jiang

Nan

2023

Inorg. Chem.

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“…26 It is shown that sodium ions were successfully doped into NFD-CN and FD-CN. Research has shown that 27 doping with Na can enhance absorption of visible light, improving the electron reduction ability. As can be seen in Table S1, the Na content in FD-CN increased from 1.08% to 2.58% compared to NFD-CN, indicating that the aggregated state formed by the freezedrying treatment was more conducive to the introduction of sodium ions.…”

Section: ■ Experimental Sectionmentioning

confidence: 99%

Preparation and Photocatalytic Degradation Performance of Amine-Rich Carbon Nitride with Structural Modulation of the Precursor

Shi,

Yu,

et al. 2023

Langmuir

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The photocatalytic performance of graphitic phase carbon nitride (g-C3N4) is strongly influenced by its own microstructure as well as the precursor structure that causes the microstructure changes. In this paper, a composite precursor of sodium chloride and cyanamide (NaCl/CA-2) was obtained by freeze-drying, which possess an aggregated state different from that of the non-freeze-drying method. This new aggregation state with the introduction of sodium ions into the cyanamide lattice results in a higher activation energy of NaCl/CA-2 in the thermal polycondensation process of the molten salt-assisted preparation of g-C3N4, which prevented the condensation of two cyanamides to one dicyandiamide, ultimately obtaining FD-CN with an amino-rich structure. The nitrogen atoms on the amino group can provide the photocatalyst with more unpaired electrons that can participate in the photoexcitation process, further improving its electron–hole separation ability and charge transfer efficiency, thus effectively enhancing its photocatalytic activity. Compared to the original g-C3N4, the photocatalytic activity of FD-CN for the degradation of methylene blue increased 2.19 times.

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“…Figure 1a shows g-C 3 N 4 (CN) has two characteristic peaks at 13.1° and 27.4°, which are crystal plane (100) and crystal plane (002), respectively [21]. The peaks at 2θ = 12.0, 24.2, 25.9, 32.6, 33.6, 46.8 and 54.1° agreed with the (001), ( 002), ( 101), ( 110), (102), and (200) crystal planes of BiOCl [10], individually.…”

Section: Characterizationmentioning

confidence: 99%

“…In the process of photoreducing reaction of carbon dioxide, the edge potential of CB of CN is less than the standard redox potential of CO 2 /CO (-0.53 eV). The potential difference is su cient for the kinetic and thermodynamic conditions [21]. In fact, in the Z-scheme structure of Fig.…”

Section: 3 Mechanismmentioning

confidence: 99%

2D/2D g-C 3 N 4 /BiOCl with oxygen vacancy heterostructure by grinding for improved visible-light-driven photocatalyst

Hou

Wang

Qin³

et al. 2022

Preprint

Self Cite

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Here, a novel 2D/2D g-C3N4/BiOCl (CN/BOC) heterojunction photocatalyst is synthesized by grinding at room temperature. The porous CN nanosheets not only facilitate the in situ nucleation and growth of BOC to form thin nanosheets and constitute an intimate contact interface, but also introduce more oxygen vacancies (OVs) in the grinding process. The 2D/2D structure of the CN/BOC heterojunction has a good interface and generates a built-in electric field, which can improve the photogenerated e− and h+ separation. The synergistic effect of the heterostructure and OVs makes the photocatalyst function significantly better than the single CN and BOC under visible light. The preferred CN/BOC-5 heterojunction of the degradation rate for tetracycline (TC) is 89.8% within 2 h, which is 1.9 and 1.2 times faster than CN and BOC. It also reduced CO2 to CO at a rate of 2.00 µ mol h− 1 g− 1, 1.1 and 3.2 times faster than CN and BOC, respectively. The mechanism for the photocatalytic of CN/BOC-5 is revealed. It implies, that the effectiveness of photo-induced carrier separation and visible-light photo-absorption are both considerably increased by the synergistic interaction between OVs and 2D/2D heterojunction. This research may open up new possibilities for the logical design of effective photocatalysts through 2D/2D heterojunctions with OVs as an easy way for environmental remediation.

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One-pot synthesis of sodium-doped willow-shaped graphitic carbon nitride for improved photocatalytic activity under visible-light irradiation

Cited by 41 publications

References 52 publications

Tuning Band Gap in Fe-Doped g-C₃N₄by Zn for Enhanced Fenton-Like Catalytic Performance

Tuning Band Gap in Fe-Doped g-C₃N₄by Zn for Enhanced Fenton-Like Catalytic Performance

Preparation and Photocatalytic Degradation Performance of Amine-Rich Carbon Nitride with Structural Modulation of the Precursor

2D/2D g-C 3 N 4 /BiOCl with oxygen vacancy heterostructure by grinding for improved visible-light-driven photocatalyst

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One-pot synthesis of sodium-doped willow-shaped graphitic carbon nitride for improved photocatalytic activity under visible-light irradiation

Cited by 41 publications

References 52 publications

Tuning Band Gap in Fe-Doped g-C3N4by Zn for Enhanced Fenton-Like Catalytic Performance

Tuning Band Gap in Fe-Doped g-C3N4by Zn for Enhanced Fenton-Like Catalytic Performance

Preparation and Photocatalytic Degradation Performance of Amine-Rich Carbon Nitride with Structural Modulation of the Precursor

2D/2D g-C 3 N 4 /BiOCl with oxygen vacancy heterostructure by grinding for improved visible-light-driven photocatalyst

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Product

Resources

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Tuning Band Gap in Fe-Doped g-C₃N₄by Zn for Enhanced Fenton-Like Catalytic Performance

Tuning Band Gap in Fe-Doped g-C₃N₄by Zn for Enhanced Fenton-Like Catalytic Performance