Photoassisted hydrogen evolution over spinel CuM2O4 (M=Al, Cr, Mn, Fe and Co)

Saadi, S.; Bouguelia, A.; Trari, M.

doi:10.1016/j.renene.2005.10.014

Cited by 114 publications

(62 citation statements)

References 21 publications

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“…The variety of oxidation states and radii for both transition metals associated with two possible polyhedral (octahedral and tetrahedral) environments can generate complex cation distributions. Thus, their structural characteristics as well as their chemical, electronic, magnetic and optical properties, often related to each other, offer many opportunities to use them for different applications such as photocatalysis (Salker & Gurav, 2000;Saadi, Bougelia, & Trari, 2006;Rios, Gautier, Poillerat, & Chartier, 1998), thermistors (Legros, Metz, & Rousset, 2006;Rousset et al, 2012), inks and pigments (Mesikova, Trojan, & Sulcova, 2005), electrochromic devices (Svegl, Orel, Hutchins, & Kalcher, 1996), photoelectrochemical decomposition of water (Walsh et al, 2009), ion-storages (Lavela, Tirado, & Vidal-Abarca, 2007), chemical sensors, and fuel cells (Xu, Wen, Wang, & Wen, 2011). Nanoparticles can exhibit different properties than bulk material counterparts owing to their small sizes.…”

Section: Introductionmentioning

confidence: 99%

A Simple Preparation Process of Pure Mn3-Xcoxo4 (X= 1, 1.5 and 2) Desert Rose-Like Nanoparticles and Their Optical Properties

Salek¹,

Guillemet‐Fritsch²,

Dufour³

et al. 2012

IJC

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Monodisperse CoMn 2 O 4 , Co 1.5 Mn 1.5 O 4 and Co 2 MnO 4 nanoparticles were prepared by a rapid and low cost method. The organic and complex dispersing agent free synthesis of stable colloidal suspensions containing pure nanoparticles of spinel oxides was optimized at low temperature (T<100 °C). The key point of the synthesis is the fast introduction of the precursor solution into a much larger volume of alkaline solution buffered with LiOH. XRD, SEM-FEG and HRTEM performed on desert rose-like nanoparticles showed that nanoparticles are crystallized and of uniform shape/size distributions. Thermogravimetric analyses give an insight into the sample composition of nanopowders in relation with semiconductor ceramic counterparts. The UV-Vis absorption spectra of these pure spinel oxide nanoparticles in solution are discussed.

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Section: Introductionmentioning

confidence: 99%

A Simple Preparation Process of Pure Mn3-Xcoxo4 (X= 1, 1.5 and 2) Desert Rose-Like Nanoparticles and Their Optical Properties

Salek¹,

Guillemet‐Fritsch²,

Dufour³

et al. 2012

IJC

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“…This model accounts for static disorder in amorphous solids. The fact that sample ZC13/8 has the smallest particle size of all samples (24 nm, 4,19 it is obvious that the resulting ternary oxides have lower values of the band gap than the individual components. It is an indication that the composite oxides can absorb more photons and generate more e+/h pairs so the photocatalytic activity can be enhanced.…”

Section: Optical Properties and Band Gap Energy Calculationmentioning

confidence: 99%

“…Kombinacijo toplotne in mehanske (krogelni mlini) obdelave smo uporabili pri pripravi polikristalni~nih me{anih binarnih in ternarnih kovinskih oksidov tipa 4 ter tudi me{ane okside, katerih sestava je odvisna tako od trajanja mletja s kroglicami in razmerja Zn(II)/Co(II). Tvorbo spinelu podobnih struktur smo dokazali z rentgensko pra{kovno difrakcijo (XRD), Mössbauerjevo spektroskopijo in Ramansko spektroskopijo.…”

Section: Povzetekunclassified

“…Ferrites with spinel-like structure prepared through solid state reaction have been used for photocatalytic hydrogen generation. 4 The spinel crystal structure enhances the effciency of light absorption due to the available extra sites in the crystal lattice. 5 Some organic molecules have been decomposed under UV irradiation in the presence of different spinels as pho- 8 and methylene blue by ZnFe 2 O 4 nanorods.…”

Section: Introductionmentioning

confidence: 99%

“…11,12 Possessing photochemical stability and low toxicity, ZnFe 2 O 4 has been applied to degrade organic pollutants, 13,14 modified by multiwall carbon nanotubes, 15 by SrTiO 3 , 16 by TiO 2 15,17,18 etc. In those cases no energy band gaps have been calculated, but it can be expected that the modification influences the energy band gap of the samples: for example, for bulk CoFe 2 O 4 , the band gap was found to be 2.7 eV 4,19 while for modified nanostructure CoFe 2 O 4 /ZnO it was found to be 4.5 eV. 7 One can therefore expect that polycrystalline mixed metal ternary oxides of the type CoxZn1-xFe 2 O 4 will have energy band gaps different from that of pure CoFe 2 O 4 and ZnFe 2 O 4 and therefore can have different photocatalytic activities for malachite green degradation.…”

Section: Introductionmentioning

confidence: 99%

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Mixed Metal Oxides of the Type CoxZn1–xFe2O4 as Photocatalysts for Malachite Green Degradation Under UV Light Irradiation

Tzvetkov¹,

Milanova²,

Cherkezova‐Zheleva

et al. 2017

ACSi

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A combination of thermal and mechanical (high energy ball milling) treatment was applied in an attempt to obtain polycrystalline mixed metal binary and ternary oxides of the type Co x Zn 1-x Fe 2 O 4 (x = 0; 0.25; 0.5; 0.75; 1). The synthetic procedure used successfully produced single-phased, homogeneous ZnFe 2 O 4 , CoFe 2 O 4 , and Co 0.75 Zn 0.25 Fe 2 O 4 , as well as mixed oxides, whose composition depended both on the duration of the high energy ball milling and the ratio Zn(II)/Co(II). The formation of spinel-like structures was proved by XRD, Mössbauer spectroscopy and Raman spectroscopy. For the characterization of the samples low-temperature N 2 adsorption, UV/Vis spectroscopy and transmission electron microscopy were applied. The energy band gap of the samples was calculated, suggesting they are promising photocatalysts. The decomposition of the Malachite Green in model water solutions under UV-light irradiation was successfully achieved in the presence of the samples as photocatalysts. The highest rate constant was obtained for the sample synthesized at longer milling time in combination with higher Zn(II)/Co(II) ratio. The photocatalytic activity of the ternary mixed oxides was compared with the pure hematite, α-Fe 2 O 3 , and the binary ZnFe 2 O 4 and CoFe 2 O 4 ferrites with spinel structure that were treated in the same way. A synergetic effect of α-Fe 2 O 3 and the spinel-like structure on the photocatalytic properties of ternary mixed metal oxides was detected.

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Progress of Copper‐based Nanocatalysts in Advanced Oxidation Degraded Organic Pollutants

Li,

You,

et al. 2024

ChemCatChem

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To address global pollution caused by contaminants in water bodies, it is crucial to develop an efficient and environmentally friendly treatment process for wastewater from various industries. Advanced oxidation processes (AOPs) have proven to be highly effective in wastewater treatment due to their high oxidation efficacy and the absence of secondary pollutants. Different methods such as ozone, Fenton, electrochemical, photolysis, and sonolysis can be used in AOPs to degrade emerging pollutants that are resistant to conventional methods. In recent years, nanotechnology has emerged as a viable solution, with various nanomaterials being developed for wastewater treatment. Among them, copper‐based nanocatalysts have shown great potential in AOPs. This review focuses on the progress and mechanisms of copper‐based nanocatalysts in wastewater treatment via AOPs. It also discusses the challenges associated with oxidation, electrochemistry, Fenton, and photocatalysis in wastewater treatment processes.

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Photoassisted hydrogen evolution over spinel CuM2O4 (M=Al, Cr, Mn, Fe and Co)

Cited by 114 publications

References 21 publications

A Simple Preparation Process of Pure Mn3-Xcoxo4 (X= 1, 1.5 and 2) Desert Rose-Like Nanoparticles and Their Optical Properties

A Simple Preparation Process of Pure Mn3-Xcoxo4 (X= 1, 1.5 and 2) Desert Rose-Like Nanoparticles and Their Optical Properties

Mixed Metal Oxides of the Type CoxZn1–xFe2O4 as Photocatalysts for Malachite Green Degradation Under UV Light Irradiation

Progress of Copper‐based Nanocatalysts in Advanced Oxidation Degraded Organic Pollutants

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