Cathodoluminescence response of natural and synthetic lanthanide-rich phosphates (Ln3+: Ce, Nd)

Barrera-Villatoro, A.; Boronat, C.; Rivera-Montalvo, T.; Correcher, V.; García-Guinea, Javier; Zárate‐Medina, J.

doi:10.1016/j.radphyschem.2017.07.027

Cited by 15 publications

(5 citation statements)

References 28 publications

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“…XRD patterns of the biominerals resulting from mixing the biomass-free struvite leachate with 20 mM CeCl 3 (Fig. 6a) exhibited similarities with a match to only Ce(PO 4 )•H 2 O (Mooney 1950;Barrera-Villatoro et al 2017) (Fig. 6d).…”

Section: Morphologies and Identification Of Biomineralsmentioning

confidence: 95%

Solubilization of struvite and biorecovery of cerium by Aspergillus niger

Kang

Csetényi

Gao

et al. 2022

Appl Microbiol Biotechnol

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Cerium has many modern applications such as in renewable energies and the biosynthesis of nanomaterials. In this research, natural struvite was solubilized by Aspergillus niger and the biomass-free struvite leachate was investigated for its ability to recover cerium. It was shown that struvite was completed solubilized following 2 weeks of fungal growth, which released inorganic phosphate (Pi) from the mineral by the production of oxalic acid. Scanning electron microscopy (SEM) showed that crystals with distinctive morphologies were formed in the natural struvite leachate after mixing with Ce3+. Energy-dispersive X-ray analysis (EDXA), X-ray diffraction (XRD) and Fourier-transform infrared spectroscopy (FTIR) confirmed the formation of cerium phosphate hydrate [Ce(PO4)·H2O] at lower Ce concentrations and a mixture of phosphate and cerium oxalate decahydrate [Ce2(C2O4)3·10H2O] at higher Ce concentrations. The formation of these biogenic Ce minerals leads to the removal of > 99% Ce from solution. Thermal decomposition experiments showed that the biogenic Ce phosphates could be transformed into a mixture of CePO4 and CeO2 (cerianite) after heat treatment at 1000 °C. These results provide a new perspective of the fungal biotransformation of soluble REE species using struvite leachate, and also indicate the potential of using the recovered REE as biomaterial precursors with possible applications in the biosynthesis of novel nanomaterials, elemental recycling and biorecovery. Key points • Cerium was recovered using a struvite leachate produced by A. niger. • Oxalic acid played a major role in struvite solubilization and Ce phosphate biorecovery. • Resulting nanoscale mineral products could serve as a precursor for Ce oxide synthesis.

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Section: Morphologies and Identification Of Biomineralsmentioning

confidence: 95%

Solubilization of struvite and biorecovery of cerium by Aspergillus niger

Kang

Csetényi

Gao

et al. 2022

Appl Microbiol Biotechnol

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“…In addition, we might also take into account that borate samples are partially hygroscopic, and consequently, the efect of UV exposure (due to the Xe lamp) could induce the radiolysis of the adsorbed water molecules, where the hydroxyl groups can be weakly bonded to cations; these OH-ions are released due to the increase in the temperature or illumination. Tis interesting efect has been observed in the glow emission of many diferent materials, which may also be one of the inevitable infuencing factors on the UV-green emission from insulator solids [21,22]. Te UV excitation spectra of Ca 1.9 Ce 0.05 Na 0.05 Mg(BO 3 ) 2 under diferent monitoring wavelengths are displayed in Figure 3, marked as curves a, b, c, and d, respectively.…”

Section: Te Uv-vis Luminescence Properties Of Ca 2 Mg(bo 3 )mentioning

confidence: 98%

The Ultraviolet-Visible Luminescence of Ce3+ in Ca2Mg(BO3)2 Phosphors with Potential Applications

Zhang

Lin

2023

Journal of Spectroscopy

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New phosphors Ca2Mg(BO3)2: Ce3+ were synthesized by the solid-state reaction method at a high temperature. The phase purity was characterized by powder X-ray diffraction (XRD). The ultraviolet-visible (UV-Vis) optical properties of Ce3+ have been investigated, and the lowest 5d levels, the emission, and the Stokes shifts of Ce3+ in the host lattice were identified. In addition, its concentration quenching process was also studied. The results show that Ce3+ ions enter Ca2+ sites with only one emission in a UV-Vis range and that the optimum doping concentration is x = 0.05. The excitation and emission spectra were evaluated to clearly reveal luminescence features.

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Section: Introductionmentioning

confidence: 99%

“…[44] In 2017, Barrera and colleagues synthesized HAP using a chemical precipitation method and observed a phase transition from the hexagonal into the monoclinic structures due to the thermal treatment at 700 C using XRD. [60] The phase changes due to doping or annealing have been attributed to the regular rearrangement or disorder of the hydroxyl ions.…”

mentioning

confidence: 99%

Thermoluminescence dose–response of synthesized and doped hydroxyapatite: effect of formed crystal phases

Taghipour

Zolfagharpour

Daneshvar³

et al. 2022

Luminescence

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In this research work, pure and doped hydroxyapatite samples were synthesized using hydrolysis and hydrothermal methods to produce powder material. The crystal structure was carried out by producing data using the X-ray diffraction system and the Rietveld method using material analysis using diffraction software. Then the sample was irradiated with different radiation absorbed doses, and their thermoluminescence response was investigated from the dosimetry point of view. The results showed that the synthesis method, doping, and annealing temperature could significantly affect the crystal structure and thermoluminescence dosimetry response of hydroxyapatite samples, consequently. The results showed that the high-temperature annealing process and dopant could lead to the formation of the β-TCP crystal phase during or after the synthesis of hydroxyapatite, and the percentage of this formed phase increased when raising the temperature, and finally led to increase in the thermoluminescence response.

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Cathodoluminescence response of natural and synthetic lanthanide-rich phosphates (Ln3+: Ce, Nd)

Cited by 15 publications

References 28 publications

Solubilization of struvite and biorecovery of cerium by Aspergillus niger

Solubilization of struvite and biorecovery of cerium by Aspergillus niger

The Ultraviolet-Visible Luminescence of Ce3+ in Ca2Mg(BO3)2 Phosphors with Potential Applications

Thermoluminescence dose–response of synthesized and doped hydroxyapatite: effect of formed crystal phases

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