Structural, conductive and dielectric properties of silicon phosphate SiP2O7 synthesis from activated clay

Khabbouchi, Mohamed; Hosni, Khaled; Zidi, Rabii; Srasra, Ezzeddine

doi:10.1016/j.clay.2019.105139

Cited by 11 publications

(2 citation statements)

References 22 publications

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“…Furthermore, a more electronegative silicon neighbourhood is expected to increase its chemical shift, hence increasing its BE. However, the Si 2p, for these particular chars (H3PO4-activated) is detected at lower BE than in the other samples, which is, in fact, compatible with the existence of more conductive silicophosphates structures: the electrical conductivity of SiP 2 O 7 is 2.96 × 10 −6 Scm −1 , while that of SiO 2 is ~ 10–12 Scm −1 (Khabbouchi et al 2019 ).…”

Section: Resultsmentioning

confidence: 65%

Valorisation of spent tire rubber as carbon adsorbents for Pb(II) and W(VI) in the framework of a Circular Economy

Bernardo

Lapa

Pinto

et al. 2023

Environ Sci Pollut Res

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Spent tire rubber-derived chars and their corresponding H3PO4 and CO2-activated chars were used as adsorbents in the recovery of Pb(II) ion and (W(VI)) oxyanion from synthetic solutions. The developed chars (both raw and activated) were thoroughly characterized to have insight about their textural and surface chemistry properties. H3PO4-activated chars presented lower surface areas than the raw chars and an acidic surface chemistry which affected the performance of these samples as they showed the lowest removals of the metallic ions. On the other hand, CO2-activated chars presented increased surface areas and increased mineral content compared to the raw chars, having presented higher uptake capacities for both Pb(II) (103–116 mg/g) and W(VI) (27–31 mg/g) ions. Cation exchange with Ca, Mg and Zn ions was appointed as a mechanism for Pb removal, as well as surface precipitation in the form of hydrocerussite (Pb3(CO3)2(OH)2). W(VI) adsorption might have been ruled by strong electrostatic attractions between the negatively charged tungstate species and the highly positively charged carbons’ surface.The results shown in this work allow concluding that the valorisation of spent tire rubber through pyrolysis and the subsequent activation of the obtained chars is an alternative and a feasible option to generate adsorbent materials with a high uptake capacity of critical metallic elements.

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Section: Resultsmentioning

confidence: 65%

Valorisation of spent tire rubber as carbon adsorbents for Pb(II) and W(VI) in the framework of a Circular Economy

Bernardo

Lapa

Pinto

et al. 2023

Environ Sci Pollut Res

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“…Additionally, a new peak at around 1030 cm −1 appeared in CSB+Ca and CSB+K, suggesting the enhancement of aromatic C=O [31]. Especially, two new peaks at 954 and 1259 cm −1 that are attributed to Si-O-P [32]…”

Section: Xrdmentioning

confidence: 95%

Effect of Different Phosphates on Pyrolysis Temperature-Dependent Carbon Sequestration and Phosphorus Release Performance in Biochar

Bai

et al. 2023

Molecules

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Carbon sequestration is the primary function of biochar. Hence, it is necessary to design biochar with high carbon (C) retention and low C loss. In this study, three P compounds, including KH2PO4, Ca(H2PO4)2, and NH4H2PO4, were premixed with corn stalk (1:4, w/w), aiming to produce biochars (CSB+K, CSB+Ca, and CSB+N) with high C sequestration and slow release of P at three temperatures (300, 500, and 700 °C). The addition of all P sources obviously increased C retention, with the order of NH4H2PO4 (65.6–83.5%) > Ca(H2PO4)2 (60.4–78.2%) > KH2PO4 (50.1–76.1%), compared with the pristine biochar (47.8–73.6%). The addition of Ca(H2PO4)2 and KH2PO4 led to an increase in aromaticity and graphitization, as evidenced by H/C, FTIR, Raman and XPS analysis, whereas an opposite result occurred on CSB+N. Furthermore, all three phosphates reduced C loss of biochars with H2O2 oxidation, and CSB+Ca showed the best effect. Ca(H2PO4)2 and KH2PO4 pretreated biochars had higher resistance to K2Cr2O7 oxidation and thermal treatment. In contrast, the C loss of NH4H2PO4-added biochar at 500 and 700 °C with K2Cr2O7 oxidation was increased by 54% and 36%, respectively. During the pyrolysis process, Ca(H2PO4)2 was transformed into insoluble Ca2P2O7, leading to the lowest P release rate of CSB+Ca. This study indicates that co-pyrolysis of corn stalk and Ca(H2PO4)2 is optimal for increasing C retention, enhancing C stability and improving slow-release performance of P regardless of pyrolysis temperature.

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An Experimental and Theoretical Investigation of the Electrical and Electronic Properties of Si5P6O25 as a Proton Conductor

Borni,

Hajji,

Smida

et al. 2023

Silicon

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Structural, conductive and dielectric properties of silicon phosphate SiP2O7 synthesis from activated clay

Cited by 11 publications

References 22 publications

Valorisation of spent tire rubber as carbon adsorbents for Pb(II) and W(VI) in the framework of a Circular Economy

Valorisation of spent tire rubber as carbon adsorbents for Pb(II) and W(VI) in the framework of a Circular Economy

Effect of Different Phosphates on Pyrolysis Temperature-Dependent Carbon Sequestration and Phosphorus Release Performance in Biochar

An Experimental and Theoretical Investigation of the Electrical and Electronic Properties of Si5P6O25 as a Proton Conductor

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