Arsenic remediation onto redox and photo-catalytic/electrocatalytic Mn-Al-Fe impregnated rGO: Sustainable aspects of sludge as supercapacitor

Penke, Yaswanth K.; Yadav, Amit; Sinha, Prerna; Malik, Iram; Ramkumar, J.; Kar, Kamal K.

doi:10.1016/j.cej.2019.124000

Cited by 63 publications

(19 citation statements)

References 66 publications

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“…The rapid recombination of photogenerated charge carriers reduces the efficiency of photocatalytic processes, hence it is advantageous to modify it by, among others, the addition of metal or metal oxide nanoparticles (Penke et al 2020). Doping of ZnO with metal nanoparticles, e.g., Ag, Pt, Ni, Au or other semiconductors (ZrO 2 , SnO 2 , Bi 2 O 3 , NiO, CuO) inhibits electron-hole pairs recombination processes, extending the photocatalytic activity of ZnO (Pascariu et al 2016).…”

Section: Introductionmentioning

confidence: 99%

ZnO–SnO2–Sn nanocomposite as photocatalyst in ultraviolet and visible light

Długosz

Banach

2021

Appl Nanosci

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By combining ZnO with SnO2, it is possible to obtain a photocatalyst with an extended lifetime and increased activity range in both ultraviolet and visible light. The paper presents the synthesis of ZnO–SnO2–Sn nanocomposite. The morphology and structure of the samples were characterized by XRD, FTIR, SEM–EDS and TEM–EDX analysis. The results showed that the synthesised nanocomposites consisted of hexagonal ZnO, cubic SnO2 and Sn nanoparticles. The results revealed that the highest removal efficiency (15.0%) of rhodamine B under visible light was achieved with ZnO–SnO2–Sn consisting of 10% of SnO2 and 5% of Sn, whereas the highest removal efficiency of methylene blue (95.6%) under UV light was achieved with ZnO–SnO2–Sn consisting of 10% of SnO2 and 1% of Sn. The presence of tin nanoparticles enhanced the photocatalytic properties directed towards visible light. The degradation of MB by ZnO–SnO2–Sn remained above 80% even in the 5th cycle, while under visible light during photodegradation the RB removal efficiency decreased from 20 to 14%.

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Section: Introductionmentioning

confidence: 99%

ZnO–SnO2–Sn nanocomposite as photocatalyst in ultraviolet and visible light

Długosz

Banach

2021

Appl Nanosci

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“…Also, there are reports on spinel type rGO based hybrid materials (MFe 2 O 4 and MCo 2 O 4 (M=Ni, Co, Zn, Mg)) examined as a CE material for DSSCs owing to their chemical properties, low cost, high stability against corrosion, interactions between metal ions via chemical bonds and multi metal composition provide more active sites improving the electrochemical activity [6,7].In this case, a novel spinel type (MFe 2 O 4 ) nanocomposites consisting of reduced graphene oxide (rGO) are suitable with excellent electro catalytic activity [8,9]. Moreover, graphene possesses π-π conjugation structure, which endowed them with excellent electrical property and superior chemical stability in electrochemical environment.…”

Section: Introductionmentioning

confidence: 99%

rGO Sheets/ZnFe2O4 Nanocomposities as an Efficient Electro Catalyst Material for I3−/I− Reaction for High Performance DSSCs

Samson¹,

Bernadsha²,

Winston³

et al. 2022

J Inorg Organomet Polym

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In this paper, Reduced Graphene Oxide (rGO) / ZnFe 2 O 4 (rZnF) nanocomposite is synthesized by a simple hydrothermal method and employed as a counter electrode (CE) material for tri-iodide redox reactions in Dye sensitized solar cells (DSSC) to replace the traditional high cost platinum (Pt) CE. X-ray diffraction analysis (XRD) and High resolution Transmission electron microscopy (HR-TEM), clearly indicated the formation of rZnF nanocomposite and also amorphous rGO sheets were smoothly distributed on the surface of ZnFe 2 O 4 (ZnF) nanostructure. The rZnF-50 CE shows excellent electro catalytic activity toward I 3 − reduction, which has simultaneously been con rmed by cyclic voltammetry (CV), electrochemical impedance spectroscopy (EIS) and Tafel polarization measurements. A DSSC developed by rZnF-50 CE (η = 8.71%) obtained quite higher than the Pt (η = 8.53%) based CE under the same condition. The superior performances of rZnF-50 CE due to addition of graphene in to Spinel (ZnF) nanostructure results in creation of highly active electrochemical sites, fast electron transport linkage between CE and electrolyte. Thus it's a promising low cost CE material for DSSCs.

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“…Reduced graphene oxide (rGO) is considered as one of the best carbon materials for it not only has good electrochemical performance, but also reduces the volume change and agglomeration of electrode materials. [32][33][34][35][36][37] Moreover, rGO itself can absorb ions in the electrolyte to form a double-layer capacitor and combined with a Bi-based active material can form an EDLC pseudo-capacitance composite capacitor. However, to date, the reported Bi-based materials and rGO composite materials, are physical mixtures, where rGO is physically adsorbed on the surface of the Bi-based material.…”

Section: Introductionmentioning

confidence: 99%