In situ construction of Fe substituted palygorskite/FeS2 heterostructure for full-spectrum photocatalytic nitrogen fixation

Ye, Xuhua; Li, Xiazhang; Chu, Xini; Wang, Zhendong; Zuo, Shixiang; Wang, Tianshi; Yao, Chao

doi:10.1016/j.jallcom.2021.159542

Cited by 28 publications

(15 citation statements)

References 38 publications

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“…106 Fe-modied palygorskite supported FeS 2 , synthesized by microwave hydrothermal method, could serve as a Z scheme type photocatalysts for PNF and recorded a NH 3 production rate of 147 mmol g À1 h À1 under solar light irradiation. 107 Its activity was ascribed to the narrowed band gap, widened light harvesting region of Fe-modied palygorskite as well as the facilitated charge transfer between Fe-modied palygorskite and FeS 2 . 107 (4) Other light responsive materials, such as graphdiyne and MOFs, supported Fe catalysts.…”

Section: Semiconductors As Photocatalysts For Pnfmentioning

confidence: 99%

“…107 Its activity was ascribed to the narrowed band gap, widened light harvesting region of Fe-modied palygorskite as well as the facilitated charge transfer between Fe-modied palygorskite and FeS 2 . 107 (4) Other light responsive materials, such as graphdiyne and MOFs, supported Fe catalysts. For instance, Li et al reported that the morphology, coordination environment and the valence state of iron oxide could be manipulated by encapsulating versatile shaped Fe 3 O 4 by graphdiyne.…”

Section: Semiconductors As Photocatalysts For Pnfmentioning

confidence: 99%

“… 107 Its activity was ascribed to the narrowed band gap, widened light harvesting region of Fe-modified palygorskite as well as the facilitated charge transfer between Fe-modified palygorskite and FeS 2 . 107 …”

Section: Photocatalysts For Pnfmentioning

confidence: 99%

See 2 more Smart Citations

A minireview on catalysts for photocatalytic N₂ fixation to synthesize ammonia

Gao

Wang

et al. 2022

RSC Adv.

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Section: Semiconductors As Photocatalysts For Pnfmentioning

confidence: 99%

Section: Semiconductors As Photocatalysts For Pnfmentioning

confidence: 99%

See 1 more Smart Citation

A minireview on catalysts for photocatalytic N₂ fixation to synthesize ammonia

Gao

Wang

et al. 2022

RSC Adv.

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“…48,49 Thus, composites with FeS2 have been employed for dye degradation, H2 evolution, CO2 reduction and NRR. 50,51,52,53,54,55 Apart from improving the light absorption properties in composites, FeS2 can act as an efficient electrocatalyst, which has been shown separately for the H2 evolution, as well as for the NRR. 56,57,58,59,60 There have been some fairly recent reports on the formation of heterojunctions of FeS2 with C3N4 and their application in organic dye and antibiotics removal.…”

Section: Introductionmentioning

confidence: 99%

Activity Enhancement of Defective Carbon Nitride for Photocatalytic Ammonia Generation by Modification with Pyrite

Zander

Timm

Weiß

et al. 2022

Preprint

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Photocatalytic nitrogen fixation under ambient conditions is currently widely explored in an attempt to develop a sustainable alternative for the Haber-Bosch process. Still, a lack of fundamental understanding of reaction pathways and nitrogen activation mechanisms result in the slow development in this field. In this work we combine defect-rich C3N4, one of the most investigated photocatalysts reported in literature for ammonia generation, with earth abundant and bioinspired FeS2 to improve the activity for photocatalytic ammonia production. By this approach, an activity enhancement of approx. 300 % compared to unmodified C3N4 was achieved. The optimal FeS2 loading was established to be 5 wt.%, with ammonia yields of up to 800 µg L-1 after irradiation for 7 hours. By detailed characterization of the electronic properties of the composites, we deduce that NH3 generation occurs via a novel mechanism involving mainly the reduction of the =N-CN group adjacent to nitrogen vacancies on defect-rich C3N4. FeS2 acts similar to a co-catalyst, improving the activity by π-back-donation from Fe-centers to the imine nitrogen of the defect-rich C3N4, reducing the activation barrier for terminal cyano group reduction upon illumination.

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“…[44,45] Thus, composites with FeS2 have been employed for photocatalytic dye degradation, H2 evolution, CO2 reduction and NRR. [46][47][48][49][50][51] Apart from improving the light absorption properties in composites, FeS2 can act as an efficient electrocatalyst, which has been shown separately for the H2 evolution, as well as for the NRR. [52][53][54][55][56] There have been also recent reports on the formation of heterojunctions of FeS2 with C3N4 and their photocatalytic application in organic dye and antibiotics removal.…”

Section: Introductionmentioning

confidence: 99%

Activity Enhancement of Defective Carbon Nitride for Photocatalytic Ammonia Generation by Modification with Pyrite

Zander

Timm

Weiß

et al. 2022

Preprint

View full text Add to dashboard Cite

Photocatalytic nitrogen fixation under ambient conditions is currently widely explored in an attempt to develop a sustainable alternative for the Haber-Bosch process. In this work we combine defect-rich C3N4, one of the most investigated photocatalysts reported in literature for ammonia generation, with earth-abundant and bioinspired FeS2 to improve the activity for ammonia production. By this combination, an activity enhancement of approx. 400 % compared to unmodified C3N4 was achieved. The optimal FeS2 loading was established to be 1 wt.%, with ammonia yields of up to 800 µg L-1 after irradiation for 7 hours. By detailed material characterization of the electronic and material properties of the composites before and after the photocatalytic reaction, we reveal that NH3 generation occurs not photocatalytically from N2, but via a light-induced reduction of =N-CN groups adjacent to nitrogen vacancies in the structure of defect-rich C3N4. FeS2 acts similar to a co-catalyst, enhancing the ammonia yield by π-back-donation from Fe-centers to the imine nitrogen of the defect-rich C3N4, thereby activating the structure and boosting the ammonia generation from cyano groups.

show abstract

In situ construction of Fe substituted palygorskite/FeS2 heterostructure for full-spectrum photocatalytic nitrogen fixation

Cited by 28 publications

References 38 publications

A minireview on catalysts for photocatalytic N₂ fixation to synthesize ammonia

A minireview on catalysts for photocatalytic N₂ fixation to synthesize ammonia

Activity Enhancement of Defective Carbon Nitride for Photocatalytic Ammonia Generation by Modification with Pyrite

Activity Enhancement of Defective Carbon Nitride for Photocatalytic Ammonia Generation by Modification with Pyrite

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In situ construction of Fe substituted palygorskite/FeS2 heterostructure for full-spectrum photocatalytic nitrogen fixation

Cited by 28 publications

References 38 publications

A minireview on catalysts for photocatalytic N2 fixation to synthesize ammonia

A minireview on catalysts for photocatalytic N2 fixation to synthesize ammonia

Activity Enhancement of Defective Carbon Nitride for Photocatalytic Ammonia Generation by Modification with Pyrite

Activity Enhancement of Defective Carbon Nitride for Photocatalytic Ammonia Generation by Modification with Pyrite

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A minireview on catalysts for photocatalytic N₂ fixation to synthesize ammonia

A minireview on catalysts for photocatalytic N₂ fixation to synthesize ammonia