Unused to useful: Recycling plasma chamber coated waste composite of ZnO and α-Fe2O3 into an active material for sustainable waste-water treatment

Wareppam, Boris; Singh, N. Joseph; Chakraborty, Soumee; Aomoa, Ng.; Kakati, M.; Oliveira, Aylson Costa; Garg, V. K.; Singh, K. Priyananda; Barg, Suelen; Ghosh, Subrata; Singh, L. Herojit

doi:10.1016/j.ceja.2021.100130

Cited by 2 publications

(3 citation statements)

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“…However, they also checked the Mössbauer spectra of pure ZnFe 2 O 4 for which quadrupole splitting was 0.42 mm/s so they proposed the possibility of small fraction of ZnFe 2 O 4 hidden in the smeared spectrum [ 87 ]. RT 57 Fe Mössbauer analysis of our recent study in plasma-treated ZnO/α-Fe 2 O 3 nanocomposites with Zn/Fe ratio of (1:1) has shown the formation of paramagnetic doublet belonging to ZnFe 2 O 4 with quadrupole splitting of 0.41–0.53 mm/s and three magnetic sextets belonging to α-Fe 2 O 3 and Fe 3 O 4 [ 92 ]. The quadrupole splitting of ZnFe 2 O 4 was found to be higher in this study compared to ideal value of (0.32–0.39)mm/s which is due to the presence of defects.…”

Section: Discussionmentioning

confidence: 99%

“…At low temperature (80 K), partial inversion state of ZnFe 2 O 4 was observed where fraction of Fe occupy the tetrahedral sites leading to shift of the Neel temperature to higher value. Also, the quadrupole splitting of the Fe 3 O 4 was found to be low thus there is reduction of Fe 3+ to Fe 2+ cation with the some fraction of α-Fe 2 O 3 transforming to Fe 3 O 4 [ 92 ].…”

Section: Discussionmentioning

confidence: 99%

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Mössbauer spectroscopic investigations on iron oxides and modified nanostructures: A review

Wareppam

Кузманн

Garg

et al. 2022

Journal of Materials Research

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Pure and doped iron oxide and hydroxide nanoparticles are highly potential materials for biological, environment, energy and other technological applications. On demand of the applications, single phase as well as multiple phase of different polymorphs or composites of iron oxides with compatible materials for example, zeolite, SiO 2 , or Au are prepared. The properties of the as-synthesized nanoparticles are predominantly dictated by the local structure and the distribution of the cations. Mössbauer spectroscopy is a perfect and efficient characterization technique to investigate the local structure of the Mössbauer-active element such as Fe, Au, and Sn. In the present review, the local structure transformation on the optimization of the magnetite coexisted with iron hydroxides, spin dynamics of the bare, caped, core–shell and the composites of iron oxide nanoparticles (IONPs), dipole–dipole interactions and the diffusion of IONPs were discussed, based on the findings using Mössbauer spectroscopy. Graphical abstract

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Section: Discussionmentioning

confidence: 99%

Section: Discussionmentioning

confidence: 99%

Mössbauer spectroscopic investigations on iron oxides and modified nanostructures: A review

Wareppam

Кузманн

Garg

et al. 2022

Journal of Materials Research

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“…The peaks at ∼501 nm (2.47 eV) corresponding to green emission is assigned to oxygen vacancy or Zinc-vacancy. Further, the peaks at ∼545 nm (2.27 eV) corresponding to the yellow-orange emission is assigned to oxygen interstitial (neutral and charged) defects [35,36]. To get insight into the defect states and changes in the course of calcination, peak positions and normalized PL intensity of these samples are plotted as shown in figures 6(b) and (c).…”

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confidence: 99%

Probing the structural transformation of ZIF-L to ZnO for sustainable congo red dye removal

Priyananda Singh,

Wareppam,

Singh

et al. 2024

Phys. Scr.

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Severe water pollution due to industrial dye effluents has alarmed the scientific world to unravel a suitable technique and appropriate catalysts for dye removal and wastewater management. In the present work, the adsorbent capacity of ZnO was tuned by calcining ZIF-L, a class of Metal Organic Framework (MOF) at temperatures ranging from 300-600 oC. XRD, FTIR, FESEM-EDX and XPS analysis shows the decomposition of ZIF-L and the nucleation of ZnO at the higher calcining temperatures above 350 oC. The ZIF-L derived ZnO obtained at 420-500 oC exhibited higher CR removal capacity than ZIF-L and ZnO obtained through co-precipitation. The optimized calcining temperature was observed at 480 oC with a maximum Congo Red (CR) dye removal percentage of 94.8 %. The adsorption capacities increased from 24.88 mg g-1 to 117.07 mg g-1 as the initial adsorbent dosage decreased from 0.5 g L-1 to 0.1 g L-1. Further, the Langmuir and Freundlich isotherm studies predict the increase in adsorption capacity from 49.09 mg g-1 to 183.98 mg g-1as the initial dye concentration increases from 5 mg L-1 to 50 mg L-1 at the optimal Z480 adsorbent dose of 0.1 g L-1. The result shows that the dye adsorption kinetics and isotherm are well fitted with the Pseudo second order model and the Fruendlich model. The plausible mechanism of dye interaction with the surface of ZnO nanoparticles at different calcining temperatures is also discussed.

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Unused to useful: Recycling plasma chamber coated waste composite of ZnO and α-Fe2O3 into an active material for sustainable waste-water treatment

Cited by 2 publications

References 53 publications

Mössbauer spectroscopic investigations on iron oxides and modified nanostructures: A review

Mössbauer spectroscopic investigations on iron oxides and modified nanostructures: A review

Probing the structural transformation of ZIF-L to ZnO for sustainable congo red dye removal

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