Influence of the pH and ageing time on the acid aluminum phosphate synthesized by precipitation

Palacios, E.; Leret, Pilar; Mata, María José de la; Fernández, J.F.; Aza, Antonio H. De; Rodríguez, Miguel Á.

doi:10.1039/c3ce00011g

Cited by 21 publications

(22 citation statements)

References 52 publications

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“…In this work, the addition of Al 2 (SO 4 ) 3 to the IL-rich phase, where a solution of K 3 PO 4 was previously added to set the pH at circa 7, will promote again the formation of two aqueous-rich phases, one rich in IL and the other rich in inorganic salt. However, the formation of a colloidal matter in the aqueous phase was observed, indicating the formation of AlPO 4 58,59. Remarkably, this step can be seen as a further cleaning step of the IL from the organic phosphorous matter and therefore to a reset of pH to acidic values.…”

Section: Resultsmentioning

confidence: 93%

Improved extraction of fluoroquinolones with recyclable ionic-liquid-based aqueous biphasic systems

2016

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In the past few years, the improvement of advanced analytical tools allowed to confirm the presence of trace amounts of metabolized and unchanged active pharmaceutical ingredients (APIs) in wastewater treatment plants (WWTPs) as well as in freshwater surfaces. It is known that the continuous contact with APIs, even at very low concentrations (ng L −1 -μg L −1 ), leads to serious human health problems. In this context, this work shows the feasibility of using ionic-liquid-based aqueous biphasic systems (IL-based ABS) in the extraction of quinolones present in aqueous media. In particular, ABS composed of imidazolium-and phosphonium-based ILs and aluminiumbased salts (already used in water treatment plants) were evaluated in one-step extractions of six fluoroquinolones (FQs), namely ciprofloxacin, enrofloxacin, moxifloxacin, norfloxacin, ofloxacin and sarafloxacin, and extraction efficiencies up to 98% were obtained. Despite the large interest devoted to IL-based ABS as extractive systems of outstanding performance, their recyclability/ reusability has seldomly been studied. An efficient extraction/cleaning process of the IL-rich phase is here proposed by FQs induced precipitation. The recycling of the IL and its further reuse without losses in the ABS extractive performance for FQs were established, as confirmed by the four consecutive removal/extraction cycles evaluated. This novel recycling strategy supports ILbased ABS as sustainable and cost-efficient extraction platforms.

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Section: Resultsmentioning

confidence: 93%

Improved extraction of fluoroquinolones with recyclable ionic-liquid-based aqueous biphasic systems

2016

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“…A previous study of the homogeneous synthesis of aluminum phosphate shows that the synthesized phosphate is amorphous at the same reaction conditions. 25 The amorphous character of phosphate is observed by the presence of a broad band under the XRD patterns of the SepP composite.…”

Section: Methodsmentioning

confidence: 99%

“…But precipitation reactions are not trivial and a deep study of the reaction parameters is necessary in order to obtain the desired materials with different compositional and morphological characteristics. [23][24][25] As mentioned above, certain properties of materials are favored by decreasing the particle size, but as it is known, the major drawback on the use of nanometric particles is that they tend to undergo agglomeration processes. This agglomeration behaviour produces a decrease of reactivity, and therefore a larger amount of material is required.…”

Section: Introductionmentioning

confidence: 99%

Self-Forming 3D Core–Shell Ceramic Nanostructures for Halogen-Free Flame Retardant Materials

Palacios

Leret²,

Mata

et al. 2016

ACS Appl. Mater. Interfaces

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The synthesis of aluminum phosphates-based composites has been widely studied during the past decade because of the promising industrial application of these materials. Here we show a simple one-pot heterogeneous precipitation approach to fabricate a sepiolite-phosphate (SepP) composite with adequate control of the size and dispersion of the phosphate nanoparticles. This coupling between aluminum phosphate and sepiolite nanofibers results in the development of a novel three-dimensional rigid supported phosphate structure, which is generated during the thermal treatment. According to our results, this phenomenon can be explained by a migration-coalescence mechanism of phosphate nanoparticles over the sepiolite support, assisted by a liquid phase. It is worth pointing out that this stimulant behavior observed here could have potential technological applications such as halogen-free flame retardant materials.

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“…27,61,69 Both minerals are also clearly identified by PXRD. 27,70 The phosphate adsorption experiments were performed at pH = 4.3, which explain the dissolution of the LDH and precipitation of phosphate minerals. For ultrathin (3-5 nm) MgAl-LDH the same four resonance with slightly different δ iso ( 31 P) were observed with a lower relative concentration of A (3-7 %) and a higher relative concentration of C (34-43 %) confirming the assignments of the P-species.…”

Section: Comparison With Earlier Combined Pxrd and 31 P Ssnmr Studiesmentioning

confidence: 99%

Atomic Level Understanding of Orthophosphate Adsorption by Magnesium Aluminum-Layered Double Hydroxides—A Multitechnique Study

et al. 2019

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The phosphate (P) adsorption properties of three magnesium aluminum layered double hydroxides intercalated with nitrate and/or carbonate (MgAl-NO 3 /CO 3 LDH) with targeted Mg:Al ratios of 2, 3, and 4 were investigated to understand how phosphate interact with the LDH using powder X-ray diffraction, solid state NMR, vibrational spectroscopy, scanning electron microscopy, and ICP-OES. The solid products after phosphate exposure contained four different phosphate species which were quantified by 31 P MAS NMR: Phosphate intercalated in the interlayer (A), phosphate adsorbed to the surface of the LDH particles (B and C), and phosphate adsorbed to amorphous aluminum hydroxide (D). Their relative concentrations depend on the Mg:Al ratio, the phosphate loading, and the intercalated anion in the parent LDH. Surprisingly, phosphate intercalated by anion exchange, which has been assumed to be the dominant mechanism of P adsorption, is less than 30 %. Instead phosphate adsorbed to the surface of the LDH particles is the predominant site (52-88 %). Moreover, a nonnegligible fraction (8-39 %) of phosphate is adsorbed to an amorphous aluminum hydroxide (AOH) impurity (Site D) especially at high phosphate concentration and exposure time. AOH is a known

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Influence of the pH and ageing time on the acid aluminum phosphate synthesized by precipitation

Abstract: Influence of the pH and ageing time on the acid aluminum phosphate synthesized by precipitation

Cited by 21 publications

References 52 publications

Improved extraction of fluoroquinolones with recyclable ionic-liquid-based aqueous biphasic systems

Improved extraction of fluoroquinolones with recyclable ionic-liquid-based aqueous biphasic systems

Self-Forming 3D Core–Shell Ceramic Nanostructures for Halogen-Free Flame Retardant Materials

Atomic Level Understanding of Orthophosphate Adsorption by Magnesium Aluminum-Layered Double Hydroxides—A Multitechnique Study

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