Impact of calcination temperature on structural, optical, and magnetic properties of spinel CuFe2O4 for enhancing photocatalytic activity

Samson, V. Anto Feradrick; Bernadsha, S. Bharathi; Mahendiran, M.; Lawrence, K. Leo; Madhavan, J.; Raj, M. Victor Antony; Prathap, S.

doi:10.1007/s10854-020-03213-0

Cited by 27 publications

(11 citation statements)

References 47 publications

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“…3, the sample contains only copper, iron and oxygen and the atomic percentage is almost close to the stoichiometry; 1:2:4 ratios for Cu:Fe:O, respectively. Also, there is no trace of impurities detected, which confirms the phase purity of the samples [20].…”

Section: Methodssupporting

confidence: 55%

Utilization of alum sludge waste for production of eco-friendly blended cement

Mohamed

El-Gamal

Farghali

2022

J Mater Cycles Waste Manag

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This work was focused on evaluating the suitability of replacing Portland cement (PC) by 5, 10 and 15 mass % of activated alum sludge waste (AAS) as a pozzolanic material. Exploitation of low-cost nanocomposite for bolstering the physical, mechanical, and stability against firing of PC–AAS-hardened composites was inspected. CuFe2O4 spinel nanoparticle with average particle size (~ 50 nm) was prepared. Inclusion of CuFe2O4 spinel in different PC–AAS-hardened composites bolsters their physicomechanical features at almost normal curing ages as well as their stability against firing. The positive impact of synthesized CuFe2O4 spinel was affirmed via TGA/DTG and XRD techniques, which indicated the presence of diverse hydration yields such as CSHs, CASHs, CFSH, and CuSH that enhance the overall physicomechanical characteristics and thermal stability of various PC–AAS-hardened composites. The composite containing (90 PC–10 AAS waste–2 CuFe2O4) offers many benefits from the economic and environmental view. Graphical abstract

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Section: Methodssupporting

confidence: 55%

Utilization of alum sludge waste for production of eco-friendly blended cement

Mohamed

El-Gamal

Farghali

2022

J Mater Cycles Waste Manag

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“…Meanwhile, we have observed that for minor facets such as (200), (−221), and (−421), lattice compression is also found as more Cu content is present in bimetallic oxides (blue zone in Figure d–f). The minor compression occurs possibly due to the phase transformation from mixed MnO facets to the ordered Mn 1.5 Cu 1.5 O 4 crystal. ,, …”

Section: Resultsmentioning

confidence: 99%

Lattice Expansion and Electronic Reconfiguration of MnCu Oxide Catalysts for Enhanced Transfer Hydrogenation of Levulinate

Liu

et al. 2022

ACS Sustainable Chem. Eng.

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Lattice-strained metal oxides often display enhanced catalytic activity and selectivity on activation of C–H, CC, CO, and O–H bonds in bio-oxygenates. However, limited experimental studies have been conducted on the structure sensitivity for tandem reactions, particularly on complicated surface redox chemical chain reactions over strained oxide materials. In this work, we employed transfer hydrogenation of levulinate as a representative example to illustrate how lattice strain affects tandem oxidation (dehydrogenation, C–H/O–H bond cleavage) and reduction (hydrogenation, CO bond saturation) reactions. The key finding is that lattice strain at MnO x –CuO x boundaries within bimetallic MnCu oxides leads to a highly unsymmetrical strain across the interface and lattice distortion. Such unique behaviors further induce the Jahn–Teller effect for electronic reconfiguration and field split for Mn 3d orbitals. Thus, tandem H2 generation and hydrogenation of levulinate to valerolactone can occur much more efficiently with a fivefold enhancement over monometallic oxide catalysts. Detailed characterization of fresh and sintered catalyst samples further demonstrated the critical role of expansion of the Mn–O facet and phase segregation in facilitated chemical chain reactions. The design principles discussed in this work could be potentially applied for other non-noble oxide catalysts in energy and environmental fields.

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“…Саме подвійні та потрійні ферити ABСFe 2 O 4 хімічно стійкі та чутливі до ультрафіолетового і видимого світла в різноманітних реакціях [18]. Крім того, потрійні шпінельні ферити можуть володіти високою фотокаталітичною активністю та магнетними властивостями [19].…”

Section: вступunclassified