A novel FeS2@g-C3N4 composite with enhanced photo-Fenton catalytic activity for pollutant degradation

Wei, Bangqi; Wang, Chan; He, Yimin; Ran, Guoxia; Song, Qijun

doi:10.1016/j.coco.2021.100652

Cited by 36 publications

(21 citation statements)

References 32 publications

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“…Of these, graphene oxide has a high electric potential density, electron mobility, optical absorption, and high impermeability. , Moreover, its oxygen-containing functional groups and larger specific surface area with pyrite are required for photocatalytic applications . Although natural or synthetic pyrite has been used to degrade some of the chemical contaminants, , no studies have evaluated the feasibility of GO coated pyrite as a heterogeneous Fenton catalyst to simultaneously eliminate both biological and chemical contaminants.…”

Section: Introductionmentioning

confidence: 99%

Simultaneous Removal of Antibiotic Resistant Bacteria, Antibiotic Resistance Genes, and Micropollutants by FeS₂@GO-Based Heterogeneous Photo-Fenton Process

Ahmed

Zhong

Wang

et al. 2022

Environ. Sci. Technol.

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The co-occurrence of various chemical and biological contaminants of emerging concerns has hindered the application of water recycling. This study aims to develop a heterogeneous photo-Fenton treatment by fabricating nano pyrite (FeS2) on graphene oxide (FeS2@GO) to simultaneously remove antibiotic resistant bacteria (ARB), antibiotic resistance genes (ARGs), and micropollutants (MPs). A facile and solvothermal process was used to synthesize new pyrite-based composites. The GO coated layer forms a strong chemical bond with nano pyrite, which enables to prevent the oxidation and photocorrosion of pyrite and promote the transfer of charge carriers. Low reagent doses of FeS2@GO catalyst (0.25 mg/L) and H2O2 (1.0 mM) were found to be efficient for removing 6-log of ARB and 7-log of extracellular ARG (e-ARG) after 30 and 7.5 min treatment, respectively, in synthetic wastewater. Bacterial regrowth was not observed even after a two-day incubation. Moreover, four recalcitrant MPs (sulfamethoxazole, carbamazepine, diclofenac, and mecoprop at an environmentally relevant concentration of 10 μg/L each) were completely removed after 10 min of treatment. The stable and recyclable composite generated more reactive species, including hydroxyl radicals (HO•), superoxide radicals (O2 • –), singlet oxygen (1O2). These findings highlight that the synthesized FeS2@GO catalyst is a promising heterogeneous photo-Fenton catalyst for the removal of emerging contaminants.

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Section: Introductionmentioning

confidence: 99%

Simultaneous Removal of Antibiotic Resistant Bacteria, Antibiotic Resistance Genes, and Micropollutants by FeS₂@GO-Based Heterogeneous Photo-Fenton Process

Ahmed

Zhong

Wang

et al. 2022

Environ. Sci. Technol.

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“…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. 61,62 The reported mechanism and band positions on which the proposed electron transfers are based, are notably different between the reports, requiring further investigation of the interaction between both materials.…”

Section: Introductionmentioning

confidence: 72%

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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“…[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. [57,58] The reported mechanism and band positions on which the proposed electron transfers are based, are notably different between the reports, requiring further investigation of the interaction between both materials.…”

Section: Introductionmentioning

confidence: 72%

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.

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A novel FeS2@g-C3N4 composite with enhanced photo-Fenton catalytic activity for pollutant degradation

Cited by 36 publications

References 32 publications

Simultaneous Removal of Antibiotic Resistant Bacteria, Antibiotic Resistance Genes, and Micropollutants by FeS₂@GO-Based Heterogeneous Photo-Fenton Process

Simultaneous Removal of Antibiotic Resistant Bacteria, Antibiotic Resistance Genes, and Micropollutants by FeS₂@GO-Based Heterogeneous Photo-Fenton Process

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 novel FeS2@g-C3N4 composite with enhanced photo-Fenton catalytic activity for pollutant degradation

Cited by 36 publications

References 32 publications

Simultaneous Removal of Antibiotic Resistant Bacteria, Antibiotic Resistance Genes, and Micropollutants by FeS2@GO-Based Heterogeneous Photo-Fenton Process

Simultaneous Removal of Antibiotic Resistant Bacteria, Antibiotic Resistance Genes, and Micropollutants by FeS2@GO-Based Heterogeneous Photo-Fenton Process

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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Simultaneous Removal of Antibiotic Resistant Bacteria, Antibiotic Resistance Genes, and Micropollutants by FeS₂@GO-Based Heterogeneous Photo-Fenton Process

Simultaneous Removal of Antibiotic Resistant Bacteria, Antibiotic Resistance Genes, and Micropollutants by FeS₂@GO-Based Heterogeneous Photo-Fenton Process