Physical properties of MgAl 2 O 4 , CoAl 2 O 4 , NiAl 2 O 4 , CuAl 2 O 4 , and ZnAl 2 O 4 spinels synthesized by a solution combustion method

Han, Mei; Wang, Zisheng; Xu, Ye; Wu, Rui; Jiao, Shihui; Chen, Yan; Feng, Shouhua

doi:10.1016/j.matchemphys.2018.05.029

Cited by 78 publications

(21 citation statements)

References 48 publications

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“…Nonetheless, the ground state shows no long-ranged order down to 0.4 K, but a correlated spin state instead emerge at T * = 2.3 K according to both neutron powder diffraction and heat capacity measurements [8]. The frustration factor (|θ CW |/T * ∼ 60) thus obtained, a standard measure of magnetic frustration, puts CuAl 2 O 4 as one of the most frustrated systems among all the T Al 2 O 4 spinels (T = Mn, Fe, Co, Ni, Cu) [10,11]. This aspect implies that sharp spin fluctuations of the quantum spin might dominate the ground state of CuAl 2 O 4 .…”

Section: Introductionmentioning

confidence: 96%

Dynamic spin fluctuations in the frustrated A -site spinel CuAl2O4

et al. 2020

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We performed nuclear magnetic resonance (NMR) and muon spin relaxation (μSR) experiments to identify the magnetic ground state of the frustrated quantum A-site spinel, CuAl 2 O 4 . Our results verify that the ground state does not exhibit a long-range magnetic ordering, but a glasslike transition manifests at T * = 2.3 K. However, the Gaussian shape and the weak longitudinal field dependence of μSR spectra below T * show that the ground state has dynamic spin fluctuations, distinct from those of conventional spin glasses.

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Section: Introductionmentioning

confidence: 96%

Dynamic spin fluctuations in the frustrated A -site spinel CuAl2O4

et al. 2020

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“…Thus, a continuous film of nanoparticles (NPs) on CBNM surfaces can be obtained. The literature reports show an array of different strategies for preparing oxide nanocomposites, such as sol-gel and solid-state techniques, chemical bath deposition, hydrothermal synthesis, and chemical vapour deposition [23,27,28,29,30,31]. Among these, most methods for the production of nanosized oxides are based on either co-precipitation or hydrothermal methods.…”

Section: Introductionmentioning

confidence: 99%

“…Considerable research has focused on compounds with spinel-type structures [27,28,29,30,42,43]. Ferrite spinels have been the most studied and have been reported in a large number of publications due to their versatile applications, including catalytic functions [43,44].…”

Section: Introductionmentioning

confidence: 99%

Co2TiO4/Reduced Graphene Oxide Nanohybrids for Electrochemical Sensing Applications

et al. 2019

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For the first time, the synthesis, characterization, and analytical application for hydrogen peroxide quantification of the hybrid materials of Co2TiO4 (CTO) and reduced graphene oxide (RGO) is reported, using in situ (CTO/RGO) and ex situ (CTO+RGO) preparations. This synthesis for obtaining nanostructured CTO is based on a one-step hydrothermal synthesis, with new precursors and low temperatures. The morphology, structure, and composition of the synthesized materials were examined using scanning electron microscopy, X-ray diffraction (XRD), neutron powder diffraction (NPD), and X-ray photoelectron spectroscopy (XPS). Rietveld refinements using neutron diffraction data were conducted to determine the cation distributions in CTO. Hybrid materials were also characterized by Brunauer–Emmett–Teller adsorption isotherms, Scanning Electron microscopy, and scanning electrochemical microscopy. From an analytical point of view, we evaluated the electrochemical reduction of hydrogen peroxide on glassy carbon electrodes modified with hybrid materials. The analytical detection of hydrogen peroxide using CTO/RGO showed 11 and 5 times greater sensitivity in the detection of hydrogen peroxide compared with that of pristine CTO and RGO, respectively, and a two-fold increase compared with that of the RGO+CTO modified electrode. These results demonstrate that there is a synergistic effect between CTO and RGO that is more significant when the hybrid is synthetized through in situ methodology.

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“…The valence band of ZnAl 2 O 4 consists of the hybridization of 2p orbitals of O 2− and 3d orbitals of Zn 2+ , as the conduction band is 2p and s orbitals of Al 3+ . As can be concluded, from individual and CuAl 2 O 4 comparison studies, Zn physical properties allow hydrogen‐bonded surface water molecules and hydroxyl groups to be adsorbed at its surface due to its higher specific surface area . In contrary to what would be theoretically expected, Zn aluminate provided more active and acid sites, showing higher photocatalytic activity during the RhB degradation photocatalytic process compared with Cu.…”

Section: Resultsmentioning

confidence: 99%

Reactive oxygen species‐induced heterogeneous photocatalytic degradation of organic pollutant Rhodamine B by copper and zinc aluminate spinels

Vieira

Leichtweis

Foletto

et al. 2019

J of Chemical Tech & Biotech

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BACKGROUND: The importance of potable water is immeasurable and its contamination by pollutants is a serious environmental problem. Rhodamine B (RhB), one such pollutant, is highly toxic to various organisms and may cause long-term undesirable effects when improperly disposed of. Thus, development of an efficient treatment technique is necessary. Among the new oxidation methods, heterogeneous photocatalysis is an emerging pollutant destructive technology. RESULTS: The photocatalytic activities of copper (Cu) and zinc (Zn) aluminate spinels (CuAl 2 O 4 and ZnAl 2 O 4 ) was evaluated.Chemical and physical properties were considered, and ZnAl 2 O 4 showed higher RhB degradation efficiency (73.90% in only 10 min) than CuAl 2 O 4 (51.95% in 10 min), reaching up to 100% in 30 min. According to results, a further RhB catalytic degradation pathway by ZnAl 2 O 4 was monitored by UV-visible spectrometry and ultra-high performance liquid chromatography coupled to diode array detection (UHPLC-DAD) analysis. When applied to wastewater from gemstone beneficiation, containing elevated RhB concentration, the ZnAl 2 O 4 caused 88% color removal in 120 min and its pollutant removal rate was 18 times greater than the commonly used ZnO.CONCLUSION: The superior performance of ZnAl 2 O 4 can be attributed to better pore properties, responsible for providing more active sites. These identified reactive oxygen species (ROS)-induced interactions and the species demonstrated that degradation occurs due to generation of O 2•and h + . Thus, ZnAl 2 O 4 proved to be an efficient photocatalyst for quick RhB pollutant degradation with promising potential for real wastewater treatment applications. CONCLUSIONBoth Cu and Zn aluminate spinels presented elevated catalytic performance, but when compared, ZnAl 2 O 4 presented higher J Chem Technol Biotechnol 2020; 95: 791-797

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Physical properties of MgAl 2 O 4 , CoAl 2 O 4 , NiAl 2 O 4 , CuAl 2 O 4 , and ZnAl 2 O 4 spinels synthesized by a solution combustion method

Cited by 78 publications

References 48 publications

Dynamic spin fluctuations in the frustrated A -site spinel CuAl2O4

Dynamic spin fluctuations in the frustrated A -site spinel CuAl2O4

Co2TiO4/Reduced Graphene Oxide Nanohybrids for Electrochemical Sensing Applications

Reactive oxygen species‐induced heterogeneous photocatalytic degradation of organic pollutant Rhodamine B by copper and zinc aluminate spinels

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