ZnFe2O4/g-C3N4 S-scheme photocatalyst with enhanced adsorption and photocatalytic activity for uranium(VI) removal

Zhang, Dai; Zhen, Yuan; Sun, Yusu; Le, Li; Ding, Dexin

doi:10.1016/j.cej.2021.129002

Cited by 181 publications

(32 citation statements)

References 42 publications

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“…The crystallinity of the as-synthesized samples was unclogged by X-ray diffraction (XRD) measurements and is presented in Figure . Interestingly, all of the characteristic peaks of the prepared ZnF are perfectly indexed to the cubic crystal phase of the spinel ferrite according to JCPDS 01-077-0011, and for pure PPY, a stretched peak is obtained at 2θ = 25.68° corresponding to the (002) plane, which suggests its amorphous nature. , Further, the diffraction pattern of WO 3 (Figure S2) was well matched to the standard monoclinic phase according to JCPDS file no. 20-1324 .…”

Section: Resultsmentioning

confidence: 99%

ZnFe₂O₄@WO_3–X/Polypyrrole: An Efficient Ternary Photocatalytic System for Energy and Environmental Application

et al. 2021

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Environmental protection and the necessity of green energy have become fundamental concerns for humankind. However, rapid recombination of photoexcitons in semiconductors often gets in the path of photocatalytic reactions and annoyingly suppresses the photocatalytic activity. In this study, a polypyrrole (PPY)-supported step-scheme (S-scheme) ZnFe2O4@WO3–X (PZFW15) ternary composite was fabricated by a multistep process: hydrothermal and calcination processes, followed by polymerization. During the formation of the heterojunction, the oxygen vacancy (OV) on WO3–X promotes effective separation and increases the redox power of the photogenerated excitons via the built-in internal electric field of S-scheme pathways between ZnF and WO3–X. The successful construction of the S-scheme heterojunction was substantiated through X-ray photoelectron spectroscopy, experimental calculations, radical trapping experiment, and liquid electron spin resonance (ESR) characterization, whereas the existence of OVs was well confirmed by EPR and Raman analyses. Meanwhile, the PPY served as a supporter, and the polaron and bipolaron species of PPY acted as electron and hole acceptors, respectively, which further enhances the charge-carrier transmission and separation in the ternary PZFW15 photocatalyst. The designed ternary nanohybrid (PZFW15) displays outstanding gemifloxacin detoxification (95%, 60 min) and hydrogen generation (657 μmol h–1), i.e., 1.5 and 2.2 times higher than the normal S-scheme ZFW15 heterostructure and pure ZnFe2O4 (ZnF), respectively, with an apparent conversion efficiency of 4.92%. The ESR and trapping experiments indicate that the generated •OH and •O2 – radicals from the PZFW15 photocatalyst are responsible for gemifloxacin degradation. This unique PPY-supported S-scheme heterojunction is also beneficial for the enhanced electron-transfer rate and provides abundant active sites for photocatalytic reactions.

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Section: Resultsmentioning

confidence: 99%

ZnFe₂O₄@WO_3–X/Polypyrrole: An Efficient Ternary Photocatalytic System for Energy and Environmental Application

et al. 2021

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“…Pure CN has a sharp characteristic peak at 812.6 cm À 1 , representing a typical triazine ring structure (see Figure 1c). [14] Shown in the green box, the peak decreases rapidly as ZFO increasing. The yellow box shows the characteristic peak of ZFO, which represents the FeÀ O vibration.…”

Section: Structure and Morphology Of Compositesmentioning

confidence: 99%

“…CN/ZFO composite has been widely used in environmental purification research, but their mechanism is still unclear. [4,[10][11][12]14] Some work suggests that the conduction band potential of ZFO is more negative than that of CN, while others suggest the opposite. In this paper, a possible photocatalytic mechanism model is proposed based on the former one (see Figure 6d).…”

Section: Photocatalytic Mechanism Of Ternary Compositesmentioning

confidence: 99%

C₃N₄/Cu/ZnFe₂O₄ Ternary Nanocomposites: Removal of Environmental Pollutants by the Synergy of Physical Adsorption and Photocatalysis

et al. 2022

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Although binary composites can enhance the separation efficiency of photo-generated carriers to a certain extent, there is still space for further improvement. Here, we focus on using copper, a cheap transition metal, as an electron channel to improve the photo-generated carrier separation efficiency of ZnFe 2 O 4 (ZFO) and C 3 N 4 (CN) composites. The kinetic constants of sample 40 %-ZFO/CN for photodegradation reaction are 2.96 and 1.98 times than that of pure sample ZFO and CN under the same conditions. However, the kinetic constants of 3 % Cu@40 %-ZFO/CN are 7.33 and 4.92 times than that of pure sample ZFO and CN, respectively. This is probably due to the physical adsorption performances of ternary composites for pollutants are significantly stronger than those of binary composites. The best photocatalysts achieved 90 % degradation efficiency within 15 minutes. A more reasonable photocatalytic mechanism model was proposed. Photo-generated hole, superoxide anion, and hydroxyl radical all play an important role in the photocatalytic reaction. The importance of them is superoxide anion > photo-generated hole > singlet oxygen > hydroxyl radical from high to low.

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“…Another step-scheme ZnFe2O4/g-C3N4 heterojunction was utilized as adsorbent and photocatalyst for the removal of U(V1) [89]. Nearly 94% and 1892mg/g of U(V1) is adsorbed and photo-catalytically reduced from pH=5-6.…”

Section: S-scheme Based Ferrite Heterojunctionmentioning

confidence: 99%

Recent Advancement on Ferrite Based Heterojunction for Photocatalytic Degradation of Organic Pollutants: A Review

Shandilya

2021

Materials Research Foundations

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The progress of ferrites and ferrites-based nanocomposites has become extensively popular in the field of photocatalytic wastewater treatment. This class of compound exhibit several fascinating properties related with their high stability, low cost, ease of functionalization, and biocompatibility. Ferrites carry outstanding magnetic behavior that helps in their easy recovery from the aqueous system thus reducing the cost. The morphology and various properties such as magnetic, absorption, optoelectronic of magnetic ferrites can be varied and optimize by applying different synthetic routes and reaction conditions. With this background we have briefly presented and reviewed the latest development in the field of photodegradation of aqueous pollutants using ferrites based heterojunction. Especially, the type-II, Z-scheme and S-scheme based heterojunction for enhanced pollutant degradation under the exposure of light are thoroughly describe. Ferrites have inherent potential in water remediation applications hence many examples were consider to impart valuable knowledge to the readers. Nevertheless, the large-scale utilization of these magnetic nanoparticles still needs to be explored. Therefore, the gaps, challenges and future prospective of ferrites nanoparticles are also explained to unveil the un-scrutinized standard of ferrites nanoparticles.

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ZnFe2O4/g-C3N4 S-scheme photocatalyst with enhanced adsorption and photocatalytic activity for uranium(VI) removal

Cited by 181 publications

References 42 publications

ZnFe₂O₄@WO_3–X/Polypyrrole: An Efficient Ternary Photocatalytic System for Energy and Environmental Application

ZnFe₂O₄@WO_3–X/Polypyrrole: An Efficient Ternary Photocatalytic System for Energy and Environmental Application

C₃N₄/Cu/ZnFe₂O₄ Ternary Nanocomposites: Removal of Environmental Pollutants by the Synergy of Physical Adsorption and Photocatalysis

Recent Advancement on Ferrite Based Heterojunction for Photocatalytic Degradation of Organic Pollutants: A Review

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ZnFe2O4/g-C3N4 S-scheme photocatalyst with enhanced adsorption and photocatalytic activity for uranium(VI) removal

Cited by 181 publications

References 42 publications

ZnFe2O4@WO3–X/Polypyrrole: An Efficient Ternary Photocatalytic System for Energy and Environmental Application

ZnFe2O4@WO3–X/Polypyrrole: An Efficient Ternary Photocatalytic System for Energy and Environmental Application

C3N4/Cu/ZnFe2O4 Ternary Nanocomposites: Removal of Environmental Pollutants by the Synergy of Physical Adsorption and Photocatalysis

Recent Advancement on Ferrite Based Heterojunction for Photocatalytic Degradation of Organic Pollutants: A Review

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ZnFe₂O₄@WO_3–X/Polypyrrole: An Efficient Ternary Photocatalytic System for Energy and Environmental Application

ZnFe₂O₄@WO_3–X/Polypyrrole: An Efficient Ternary Photocatalytic System for Energy and Environmental Application

C₃N₄/Cu/ZnFe₂O₄ Ternary Nanocomposites: Removal of Environmental Pollutants by the Synergy of Physical Adsorption and Photocatalysis